Browse Topic: Thermoplastics

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Maximizing the Potential of TPU Extrusion in Medical Tubing ApplicationsTBMG-5216412/01/2024
Whether for vascular catheters or implantable devices, medical tubing must meet tough standards for flexibility, strength, and biocompatibility. That’s why more manufacturers are turning to thermoplastic polyurethanes (TPUs) that strike the ideal balance between these key properties, making them an excellent choice for high-performance medical tubing. Unlocking the best that TPUs have to offer means optimizing the extrusion process. This article looks at why TPUs are a top pick, the common obstacles in extrusion, and the ways manufacturers can fine-tune their process to get the most out of different grades.
Optimization of Buckling Load of Thin Hybrid Composite plate of Carbon/Glass Epoxy using Taguchi Approach2022-28-050211/18/2022
The aim of the paper is to analyze the effect of the design factors on the buckling load of the thin hybrid laminated composite plate made of Carbon/Glass Epoxy fiber. The detailed investigation is done on the stacking sequence, stacking angle, cut-out orientation whose shape is elliptical and thickness of the plate. For optimization the Taguchi approach of Design for Experiments (DOE) is being considered. For obtaining the combinations L16 orthogonal array is implemented using MINITAB and analysis is carried using ANSYS software. Analysis of each factor is done and significance of each factor is decided based on the 0.05 confidence level. Normal Probability and Residual versus Fitted Values plot is being obtained. Based on the delta values rank for each factor which have four levels are given. The boundary condition of simply supported on all edges is considered during the simulation for calculating the critical buckling load.
Gore, Renuka, Bhaskara Rao, Lokavarapu
High performance unfilled polypropylene material for light weight interior trims2022-01-039303/29/2022
Light weighting is important to improve energy efficiency in the automotive industry. In this paper, high performance unfilled polypropylene copolymer (PPCP) material was selected and developed to reduce weight and cost without compromising on functional requirements for interior trims such as door trims, lower pillar trims, scuff trims and rear quarter trims (RQT). Interior trims are loaded with challenging requirements such as stiffness, dimensional stability, haptic feel, scratch resistance, cleanability, thermal stability, toughness, low emission and weathering resistance. Reactor polymerised PPCP material compound met these requirements by having ultra-flow behaviour, optimum tensile strength, balanced modulus - impact strength, scratch resistant, low emission and improved thermal properties. The combination of material, optimized part and tool design led to weight savings and considerable cost reduction.
Govindaraj, Karthik, Deoli, Manish, Gregory, Koch
Wear and Friction of PTFE and PEEK Coated Cast Iron Piston Ring 2022-01-038003/29/2022
In engine 30% of the total energy is lost due to the friction between piston ring and cylinder liner due to their constant rubbing motion. A piston that reciprocates at high speeds has piston rings that constantly scrape against the wall leading to high frictional losses within the engine. The engine has to work against this resistance to provide the required power, and hence it will consume more fuel. For this reason, material used for these components is more crucial. Reduction of surface friction between moving parts in order to increase overall efficiency can be achieved by suitable coating. The most commonly used piston rings are coated with chromium layers that are electroplated which is being replaced by chrome plating. Low coefficient of friction (COF) and high wear resistance can be achieved by self-lubricating coating of PTFE and PEEK polymer-based composite coatings. Experimental results showed that the PEEK and PTFE coating performed better in terms of friction and wear
Rajendran, R.
Morphological Characterization of ABS and PC-ABS Surfaces for Automotive Industry2022-01-039503/29/2022
In the automotive industry, the measurement, control and reproducibility of certain morphological characteristics of surfaces are increasingly required since the surface morphology may be able to explain a large number of physical and mechanical characteristics, such as the degree of wear or the degree of adhesion by adhesives, glues or paints on the surfaces themselves. In this regard, the work is based on the study of ISO-25178 surface morphological parameters capable of completely characterizing a polymeric surface from a microstructure point of view. In particular, this work studies different surfaces in Abs (Acrylonitrile butadiene styrene) and PC-Abs (Polycarbonate/acrylonitrile butadiene styrene) material after different etching treatments performed with different chemical elements: these treatments can radically modify the micro-roughness of a surface making it more or less suitable according to the industrial purposes sought. In addition, the work wants to identify which set
Deninno, Gianluca
Impact of chemical blowing agent on polypropylene properties2021-28-020310/01/2021
Weight reduction and material saving goals in automotive applications have led to the processing of thermoplastic polymers by foam injection molding. The density of the foamed polymer can be reduced up to 20%. Whilst, work has been reported on the weight reduction of the foamed polymer by using different types of blowing agent technologies, there has been limited studies in the areas of the sound transmission loss and material dampening properties of these materials. The present study is intended to understand the effect of chemical blowing agent (CBA) on the properties of polypropylene. The molded specimens were characterized against the density, Tensile property, flexural property, Izod impact, heat deflection temperature, differential scanning colorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infra-red spectroscopy (FT-IR), sound transmission loss (STL) properties as per standard test protocol and cell structures by stereo microscope. Obtained results indicates
Shukla, Sandeep Kumar, Balaji, K V
Packing, Preformed (PTFE) - AMS3668, SealAS9956B (Current)08/19/2021
SCOPE IS UNAVAILABLE.
A-6C2 Seals Committee
Molded or Extruded Bar, Rod, and Shapes Produced from 20% Graphite – 3% Polytetrafluoroethylene (PTFE) Filled Polyamide-Imide (PAI) MaterialAMS3670/2C (Current)05/19/2021
This specification covers molded or extruded bar, rod, and shapes produced from a polyamide-imide (PAI) polymer filled with 20% graphite and 3% polytetrafluoroethylene (PTFE). This is designated as Grade 2 material per AMS3670.
AMS P Polymeric Materials Committee
Bar, Rod, and Shapes Produced from 12% Graphite - 3% Polytetrafluoroethylene (PTFE) Filled Polyamide-Imide (PAI) MaterialAMS3670/3C (Current)05/19/2021
This specification covers molded or extruded bar, rod, and shapes produced from a polyamide-imide (PAI) polymer filled with 12% graphite and 3% polytetrafluoroethylene (PTFE). This is designated as Grade 3 material per AMS3670.
AMS P Polymeric Materials Committee
Interlaminar Properties Improvement of Nanocomposites Using Coiled Nanomaterials2021-01-002703/02/2021
In this research helical Carbon Nanotubes (CNTs) with various weight percentages as an additional reinforcement were used. The objective was to investigate the effectiveness of helical geometries of the CNTs to form interlocking mechanisms with the resin and the traditional microfiber reinforcements to improve the overall performance of the composite structures and assemblies. In this study, ASTM D2344/2344M-16 is used to study the short beam strength of the laminated nanocomposites and evaluate the benefit of the mechanically interlocked helical CNTs reinforcement. Overall, three sets of composite laminates (i.e., with neat epoxy, and with two different wt% of Helical CNTs reinforced epoxy) were fabricated per ASTM standard D2344/2344M-16. Adequate test specimens were prepared and then they were tested per ASTM standard. The test results were analyzed and evaluated to determine the effects of helical CNTs on short beam strength of the laminated nanocomposites.
Sritharan, Ramanan, Askari, Davood
Adapting to Manufacturing Challenges of COVID-19TBMG-3855502/01/2021
The COVID-19 pandemic has caused great changes and challenges, disrupting not only the global marketplace but also the supply chains that keep people and essential businesses healthy and functioning. For example, amid an already growing market for infection-control gear and hygienic products made of nonwoven thermoplastic fabrics, COVID-19 has greatly strained and helped to reshape the global supply chain for nonwoven personal protective equipment (PPE).
INSULATION SLEEVING, ELECTRICAL, HEAT SHRINKABLE POLYTETRAFLUOROETHYLENEAS23053/12A (Historical)04/21/2020
AE-8D Wire and Cable Committee
Eco-profiling of Bio-epoxies via Life Cycle Assessment13-01-01-000303/25/2020
Epoxies, synthesized from bisphenol-A (BPA) and epichlorohydrin (ECH), are predominantly used as coatings, adhesives, and matrix material in fiber-reinforced composites for body-in-white (BiW) applications in the automotive sector. However, given the production of conventional epoxies from nonrenewable petroleum resource and toxicity of BPA, several initiatives have been undertaken by researchers to synthesize alternative epoxies from various bio-sources that are free of BPA and exhibit similar mechanical performance. As a result, such bio-sourced epoxies are almost immediately termed as “ecofriendly,” despite the lack of comprehensive evaluation of their ecological performance that takes into account enhanced natural resource usage and associated impacts accompanying such epoxies. Hence, this work aims at addressing this gap by evaluating the environmental impacts of such bio-sourced epoxies via cradle-to-gate life cycle assessment (LCA) to determine the genuine credentials of their
Kousaalya, Adhimoolam Bakthavachalam, Iyer, Rakesh Krishnamoorthy, Pilla, Srikanth
AFP Processing of Dry Fiber Carbon Materials (DFP) for Improved Rates and Reliability2020-01-003003/10/2020
Automated fiber placement of pre-impregnated (pre-preg), thermoset carbon materials has been industrialized for decades whereas dry-fiber carbon materials have only been produced at relatively low rates or volumes for large aerospace structures. This paper explores the differences found when processing dry-fiber, thermoset, carbon materials (DFP) as compared to processing pre-preg, thermoset materials with Automated Fiber Placement (AFP) equipment at high rates. Changes to the equipment are required when converting from pre-preg to dry fiber material processing. Specifically, the heating systems, head controls, and tow tension control all must be enhanced when transitioning to DFP processes. Although these new enhancements also require changes in safety measures, the changes are relatively small for high performance systems. Processing dry fiber material requires a higher level of heating, tension control and added safety measures. However, once these are achieved, processing rates and
Assadi, Michael, Field, Tyler
High-Speed 3D Printer for High-Performance PlasticsTBMG-3526210/01/2019
3D printers that build small parts layer by layer from melted plastic can take up to an hour to produce a pocket-sized piece. This process is far too slow for the mass-production of components as required by the automotive industry, for instance.
Thin Nylon Films for Transparent Electronic DevicesTBMG-3525510/01/2019
Very thin nylon films were created that can be used in electronic memory components. The films are several hundreds of times thinner than a human hair and could be used in bendable electronic devices or for electronics in clothing.
Clamp Material, Injection MoldedAIR1397B (Current)09/26/2019
This report presents the material properties and test requirements for an injection molded thermoplastic compound utilized for fabrication of AS1396 clamp block assembly.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Automotive Engineering: September 201919AUTP0909/01/2019
Engineering the 2020 Chevrolet Corvette The eighth-gen (C8) Corvette is a creative mix of novel and traditional technical solutions - unleashed at a shockingly low base price. Stuck on structural adhesives As the need for lighter materials and enhanced body performance intensifies, structural adhesives flourish as a materials-joining solution. Rethinking ADAS materials New specialized thermoplastics offer greater design freedom to improve sensor performance and packaging, at reduced cost. Inside VW's expanding Silicon Valley lab The pioneering California innovation hub enters its third decade on a new wave of innovation. Editorial There is no substitute for 'Automotive Grade' Standards News SAE embraces micromobility and its macro challenges Supplier Eye The value - and risks - of Technology Testbeds What We're Driving Latest mass-reducing innovations honored by Altair GM underway with plan to build U.S. electric-vehicle charging infrastructure Ford 'cranks' it up with another big V8
Composite Advances Lignin as Renewable 3D Printing MaterialTBMG-3393503/01/2019
Lignin is the material left over from the processing of biomass. It gives plants rigidity and also makes biomass resistant to being broken down into useful products. Researchers combined a melt-stable hardwood lignin with conventional plastic, a low-melting nylon, and carbon fiber to create a composite with just the right characteristics for extrusion and weld strength between layers during the printing process, as well as excellent mechanical properties.
Insulation Sleeving, Electrical, Heat Shinkable, PolytetrafluoroethyleneAMSDTL23053/12B (Current)12/07/2018
The requirements for acquiring the sleeving described herein shall consist of this specification sheet and the issue of the following specification listed in that issue of the Department of Defense Index of Specifications and Standards (DODISS) specified in the solicitation: MIL-DTL-23053.
AE-8D Wire and Cable Committee
Ultralight Gloves Provide Realistic Haptic FeedbackTBMG-3338212/01/2018
Engineers and software developers are seeking to create technology that lets users touch, grasp, and manipulate virtual objects while feeling like they are actually touching something in the real world. An ultralight glove — weighing less than 8 grams per finger — was developed that enables users to feel and manipulate virtual objects. The system provides extremely realistic haptic feedback and could run on a battery, allowing for freedom of movement.
Research Collaboration Could Reshape Injection MoldingTBMG-3308810/01/2018
As Ralph Colby peers at the microscope image in front of him, he thinks he can make them out — “shish kebabs,” as polymer scientists call them. Nobody knows for sure what they are, but these shapes that appear at seemingly unpredictable times when certain plastics cool have a big impact on the overall properties of plastics. It's not a big deal when a plastic fork breaks, but if a bearing cage on an airplane were to break, it could put people in danger.
Tech Briefs: August 201818AERP0808/01/2018
Designing a High-Speed Decoy Unmanned Aerial Vehicle (UAV) Using Thermoplastics in Aerospace Applications In-Flight Real-Time Avionics Adaptation Using Turbine Flow Meters for Aerospace Test and Measurement Applications Communicating from Space: The Front End of Multiscale Modeling Laser-Based System Could Expand Space-to-Ground Communication Hydraulic Testing of Polymer Matrix Composite 102mm Tube Section Research could lead to development of a composite material that can be processed at a low temperature and still be used at 1000°F. Permeation Tests on Polypropylene Fiber Materials Study attempts to determine if polypropylene nanofiber materials can be used in air filtration systems to remove toxic vapors. Inter-Laboratory Combat Helmet Blunt Impact Test Method Comparison Ensuring consistent test methods could reduce the risk of head injuries.
POLYTETRAFLUOROETHYLENE (PTFE) HOSE ASSEMBLIES (WIRE REINFORCED) FOR MEDIUM AND HIGH PRESSURE FLUID SYSTEMS IN AIRCRAFTTSC47-012_0404/19/2018
No Scope available.
Carbon Fiber/Epoxy Mold with Embedded Carbon Fiber Resistor Heater - Case Study05-11-02-001104/07/2018
The article presents a complete description of the design and manufacturing of a Carbon Fiber/epoxy mold with an embedded Carbon Fiber resistor heater, and the mold performances in terms of its surface temperature distribution and thermal deformations resulting from the heating. The mold was designed for manufacturing aileron skins from Vacuum Bag Only prepreg cured at 135°C. The glass transition temperature of the used resin-hardener system was about 175°C. To ensure homogenous temperature of the mold working surface in the course of curing, the Carbon Fiber heater was embedded in a layer of a highly heat-conductive cristobalite/epoxy composite, forming the core of the mold shell. Because the cristobalite/epoxy composite displayed much higher thermal expansion than CF/epoxy did, thermal stresses could arise due to this discrepancy in the course of heating. Therefore, to lower these stresses, the Carbon Fiber/epoxy faces were separated from the cristobalite/epoxy core containing the
Czarnocki, Piotr, Boczkowska, Anna, Frączek, Wojciech, Chabera, Paulina, Kubis, Michał, Marjanowski, Jędrzej
Fluorinated Alkyl Ether Epoxy Resin Compositions and Applications ThereofTBMG-2816801/01/2018
NASA Langley Research Center has developed fluorinated alkyl ether-containing epoxies designed as an anti-insect coating. The robust and durable coating was developed to improve aircraft efficiency, but the coating could be useful in a variety of applications where reduction of insect residue adherence is desirable, such as in automotive and wind energy industries.
Researchers Develop Flexible, Stretchable Photonic DevicesTBMG-2811801/01/2018
Researchers at MIT and several other institutions have developed a method for making photonic devices — similar to electronic devices but based on light rather than electricity — that can bend and stretch without damage. The devices could find uses in cables to connect computing devices, or in diagnostic and monitoring systems that could be attached to the skin or implanted in the body, flexing easily with the natural tissue.
Performance Specification Anti-Seize Thread Compound, High Temperature - PTFE OnlyAMS3050/5 (Current)12/12/2017
The foundation specification (AMS3050) and this category specification (AMS3050/5) cover anti-seize greases conforming to the requirements but using the anti-seize ingredient PTFE only. For use only below 600 °F / 315 °C.
AMS M Aerospace Greases Committee
Using Thermoplastic Composites for Aerospace Applications17AERP12_0412/01/2017
Recent advancements in composite production and processing are making thermoplastics a viable option in a wider array of aerospace applications. Traditionally, aerospace manufacturers have turned to composites for their significant weight reductions and cost savings compared with conventional aerospace materials, such as aluminum. Thermoset composites have been the composite of choice in recent years for their perceived high quality, commercialized pricing, more mature manufacturing process and well-established supply chain. They found application in diverse areas, including primary structural applications. Thermoplastics, in contrast, have been considered a costlier option and were mainly used in small semi-structural applications, such as clips and brackets.
Multi-Functional Yarns and Fabrics with Anti-Microbial, Anti-Static, and Anti-Odor CharacteristicsTBMG-2801212/01/2017
Prior art fabrics used to manufacture military combat uniforms typically are made from yarns comprised of a blend of cotton and nylon fibers. This blend supports dyeing and printing techniques that use a combination of acid and vat dyes to impart a camouflage pattern. The yarns made from the blend are combined with lightweight, thin fabric construction to produce fabrics that provide comfort, durability, and UV resistance. Other fabrics, such as flame-retardant fabrics, are made from blends of Nomex® synthetic fiber meta-aramid fiber, Kevlar® synthetic fiber para-aramid fiber, and P140 electrostatic-dissipative fiber, and also provide a level of visual and near-infrared camouflage protection; however, they do not provide anti-odor, anti-micro-bial, or electrostatic dissipation performance in a single, complete fabric. Other prior art techniques involve treating uniform fabrics with antimicrobial treatments, but some of these are not durable and wear out after repeated laundering.
Using Thermoplastic Composites for Aerospace ApplicationsTBMG-2795212/01/2017
Recent advancements in composite production and processing are making thermoplastics a viable option in a wider array of aerospace applications.
POTTING COMPOUND, EPOXY Bisphenol A-Type Unfilled, Room Temperature Cure, SemiflexibleAMS3731/10C (Current)11/29/2017
This specification covers an unfilled, room-temperature-polymerizing epoxy resin formulation with a polyamide hardener, supplied as a two-component system.
AMS P Polymeric Materials Committee
Thermoplastic Fuselage DemonstratorTBMG-2766110/01/2017
Porcher Industries Badinières, France +33 (0)4 74 43 10 10
Resistive Heating-Assisted Infiltration and Cure (RHAIC) for Polymer/Carbon Nanotube Structural CompositesTBMG-2754609/01/2017
NASA’s Langley Research Center scientists have developed a process for fabricating carbon nanotube (CNT) structural nanocomposites that brings CNT-based composites closer to realizing their potential for structural applications. Conventional methods fail to properly wet CNTs within the epoxy matrix due to high resin viscosity, resulting in poor infiltration and reduced load transfer between the CNTs and matrix. The NASA process — resistive heating-assisted epoxy infiltration (RHAEI) — uses the CNTs’ electrical resistance to generate heat, which reduces epoxy resin viscosity for greater CNT wetting and adhesion. Mechanical properties are significantly improved compared to conventional methods. NASA’s process has been demonstrated to offer 50% improvement in strength and elastic modulus, with mechanical properties competitive with structural carbon fiber composites.
Acoustically Absorbing Lightweight Thermoplastic Honeycomb Panels2017-01-181306/05/2017
The aerospace industry has employed sandwich composite panels (stiff skins and lightweight cores) for over fifty years. It is a very efficient structure for rigidity per unit weight. For the automobile industry, we have developed novel thermoplastic composite panels that may be heated and shaped by compression molding or thermoforming with cycle times commensurate with automotive manufacturing line build rates. These panels are also readily recycled at the end of their service life. As vehicles become lighter to meet carbon dioxide emission targets, it becomes more challenging to maintain the same level of quietness in the vehicle interior. Panels with interconnected honeycomb cells and perforations in one skin have been developed to absorb specific noise frequencies. The absorption results from a combination and interaction of Helmholtz and quarter wave resonators. Computer modeling was used to design panels that absorb one of the problematic frequency ranges (800-1,250 Hz), caused by
Jonza, James M., Herdtle, Thomas, Kalish, Jeffrey, Gerdes, Ronald, Yoo, Taewook, Eichhorn, Georg
STRAPS, CLAMPS, AND MOUNTING HARDWARE, PLASTIC FOR CABLE HARNESS TYING AND SUPPORT CLAMP, LOOP, NYLON, ADJUSTABLE, WIRE SUPPORT, TYPE III, CLASS 1AS23190/1A (Current)05/12/2017
AE-8C2 Terminating Devices and Tooling Committee
Hose Assemblies, Convoluted Polytetrafluoroethylene Metallic Reinforced, High Temperature, Medium Pressure, Aircraft, Metric (Supplement 1)MA620SUP1A (Current)04/18/2017
This supplement forms a part of Aerospace Standard MA620, HOSE ASSEMBLIES, CONVOLUTED, POLYTETRAFLUOROETHYLENE, METALLIC REINFORCED, HIGH TEMPERATURE, MEDIUM PRESSURE, AIRCRAFT, METRIC and shall be used to identify hose assembly standards citing this procurement specification.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Tire Tread Performance Modification Utilizing Polymeric Additives2017-01-150203/28/2017
Tire manufacturers have long grappled with the challenge of balancing the conflicting tire attributes of traction, rolling resistance, and treadwear. Improvements to one of these “magic triangle” attributes often comes at the expense of the other attributes. Recent regulations have further increased the pressure on manufacturers to produce optimized tires with minimal performance compromises. In order to meet this challenge, the tire industry is looking to new material systems beyond the traditional tire tread components. Polymeric materials beyond the base elastomers and processing oils used in tread provide opportunities to modify the physical and viscoelastic properties of tread. In this study, various polymeric materials were evaluated as additives in a model tire tread formulation. Hydrocarbon resin, high styrene resin, and thermoplastic styrene elastomers were added to the model formulation at various loading levels and through various addition strategies. The thermal behavior of
Harper, Madeline, Tardiff, Janice, Haakenson, Daniel, Joandrea, Maria, Knych, Matthew
Development of GFRTP Crush Box with Consideration of Use Environment and Effect of Fiber Orientation2017-01-049803/28/2017
Regulation of automotive CO2 emissions is becoming increasingly stringent throughout the world in response to global warming. For automakers, this means a focus not only on increasing the fuel economy of powertrains, but also on reducing automotive driving resistance. High expectations are held for thermoplastic fiber-reinforced plastics (FRP) for the realization of automotive weight savings while also offering high levels of productivity and recyclability. Thermoplastic FRP crush boxes display a higher level of energy absorption performance than metal (steel, aluminum, etc.) crush boxes. This will contribute to automotive weight savings and improved package design. In the case of automotive front bumper beam systems, it is necessary to realize stable load characteristics irrespective of the use environment. It is therefore necessary to consider the effects of temperature and thermoplastic resin degradation. The molding process for discontinuous fiber-reinforced FRP produces
Yabu, Tomoya, Yasuhara, Shigeto, Kashiwagi, Masakazu
Marking of Plastic PartsJ1344_201703 (Current)03/28/2017
This SAE Recommended Practice provides a system for marking plastic parts to designate the type of material from which the part was fabricated.
Plastics Committee
Automotive A/C Servicing – Refrigerant Flushing of a Failed A/C System2017-01-016703/28/2017
The failure of an A/C system often results in the introduction of contaminants to the A/C system. The sources of the contaminants include debris from damaged components and debris from the surrounding environment. Returning the A/C system to service requires the removal of these contaminants from any reused components. The recommended approach to cleaning contaminated components and systems is to flush with a solvent flushing machine. Previous internal studies have concluded that solvent flushing will remove all contaminants, restoring component and system performance. Many commercial refrigerant recovery and recharge machines include a refrigerant “flush” feature which can flush oil from the system and components with the systems refrigerant. The effectiveness of using the “flush” feature of a refrigerant recovery and recharge machine with an added in-line filter to remove contaminants is investigated. One gram of Arizona Test Dust is introduced to the suction line of an automotive A
Lambert, Steven, Jamo, William, Kurtz, Mike
Frequency Effects on High-Density Polyethylene Failure under Cyclic Loading2017-01-033203/28/2017
High density polyethylene (HDPE) is widely used in automotive industry applications. When a specimen made of HDPE tested under cyclic loading, the inelastic deformation causes heat generated within the material, resulting in a temperature rise. The specimen temperature would stabilize if heat transfer from specimen surface can balance with the heat generated. Otherwise, the temperature will continue to rise, leading to a thermo assist failure. It is shown in this study that both frequencies and stress levels contribute to the temperature rise. Under service conditions, most of the automotive components experience low cyclic load frequency much less than 1 Hz. However, the frequency is usually set to a higher constant number for different stress levels in current standard fatigue life tests. This practice may lead to confusion in understanding the failure mechanism of polymer material and the fatigue data obtained from the lab test would not be appropriate for evaluation of the real
Qi, Zhengpan, Lu, Li, Doan, Linh, Thota, Bhavani, Zeng, Danielle, Su, Xuming
Process for Preparing Aerogels from PolyamidesTBMG-2601812/01/2016
Sometimes referred to as “solid smoke,” aerogels are the world’s lightest solid materials, composed of approximately 85% air by volume. Polyamide aerogels open up a whole new world of applications due to their unique properties: translucent like silica aerogels, thermoplastic, ultra-low density, superior mechanical properties, low-temperature operating range, and highly flexible (as compared to NASA Glenn’s polyimide aerogels). Polyamide aerogels are further novel because of their tunable glass transition temperatures, meaning that crystallinity — and hence strength — can be controlled via operating temperature. Addressing the key drawbacks of aerogel technology (hydroscopicity, fragility, cost), NASA Glenn’s suite of organic aerogels is cost-competitive with both existing silica aerogels and, with scale-up, high-end foamed polymer insulation. Finally, Glenn’s materials are truly multi-functional — they can be structural members while providing superior thermal properties and extremely
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 120, 80 (180)AMS3903/5B (Current)11/11/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 328, 80 (180)AMS3903/8B (Current)11/11/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 181, 80 (180)AMS3903/6B (Current)11/11/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 281, 80 (180)AMS3903/7B (Current)11/11/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 328, 175 (350)AMS3903/4B (Current)11/11/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 281, 175 (350)AMS3903/3B (Current)11/10/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 120, 175 (350)AMS3903/1B (Current)11/10/2016
This specification covers one type of epoxy-resin-impregnated organic fibers in the form of woven cloth.
AMS P17 Polymer Matrix Composites Committee
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