Browse Topic: Resins

Items (503)

Optimization of Buckling Load of Thin Hybrid Composite plate of Carbon/Glass Epoxy using Taguchi Approach

2022-28-050211/18/2022

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

An Integrated Approach for Simulation of the RTM Process

2022-01-038703/29/2022

In the preform preparation stage of the RTM process, the fabric is draped on the mold along the geometry. Before the filling and warpage analysis, the draping analysis will be performed to get the fabric orientation. Due to the anisotropy of the fabric material, the main direction of the material has a significant influence on the overall flow behavior and warpage of the product. In this study, the advanced simulation approach for the RTM process is demonstrated. The filling and warpage analysis integrate with the draping simulation result from AniForm. The influences of fabric shearing and fiber orientation on the resin flow and warpage in RTM process is studied. With more accurate fabric orientation prediction methods, the accuracy of predicting fabric ply orientation is improved and more accurate infusion and product warpage simulation results can be obtained.

Interlaminar Properties Improvement of Nanocomposites Using Coiled Nanomaterials

2021-01-002703/02/2021

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

INSTALLING AND REMOVAL TOOLS, CONNECTOR, ELECTRICAL CONTACT, TYPE I AND II, CLASS 2, COMPOSITION B

AS81969/10A (Current)01/26/2021

AE-8C2 Terminating Devices and Tooling Committee

Advancements in Thermoplastic Optical Materials for Automotive Lighting Systems

2020-01-063404/14/2020

Described are strategies to maximize the performance and efficiency of long path length acrylic optical elements through material selection and manufacturing optimization. Recent LED lamp designs include functional optical elements such as light pipes and dispersion optics that channel LED light through long optical path lengths (LOPL), 5-80 cm in length. Typically, these elements are manufactured from thermoplastic optical materials such as PMMA or PC through injection molding. However, conventional thermoplastic optical materials are not suitable for LOPL application due to insufficient luminous transmission and high absorption coefficients, resulting in inadequate lamp function and poor efficiency. Furthermore, the effects of molding conditions on LOPL performance are poorly understood. Recent advancements in acrylic technology produced optimized materials for LOPL signature lighting optics: Plexiglas® HT121-LPL® and V825T-LPL® resins. Compared to conventional acrylic resins, these

Cromer, Brian, Thoma, Laura, Macy, Noah, Rissel, Charles

Durability Study of Automotive Additive Manufactured Specimens

2020-01-095704/14/2020

The long-term weathering behavior of three different 3D printable, non-stabilized, UV cure resin formulations (A and B with thiol-ene base, and C with acrylate chemistry) was studied using tensile testing, nano-indentation, and photoacoustic infrared (FTIR-PAS) spectroscopy. To this end, type I tensile bars were printed from each resin system using a 3D printer, and were post UV-cured under a broad spectrum source. Systems A and C showed a similar trend after weathering. They first experienced an increase in modulus and tensile strength, due to additional crosslinking of the residual unreacted species. This increase in mechanical properties was followed by a drop in modulus, tensile strength, and percent elongation, due to the over-crosslinking and consequent embrittlement. System B, however, showed remarkable retention of the mechanical properties before/after weathering. Nano-indentation results were in good agreement with the tensile properties, showing a similar trend in hardness

Zareanshahraki, Forough, Davenport, Amelia, Cramer, Neil, Seubert, Christopher, Lee, Ellen, Cassoli, Matthew

Primer, Anodic Electrodeposition for Aircraft Applications

AMS3144A (Current)10/17/2019

This specification establishes the requirements for a waterborne, corrosion inhibiting, chemical and solvent resistant, anodic electrodeposition epoxy primer capable of curing at 200 to 210 °F (93 to 99 °C).

AMS G8 Aerospace Organic Coatings Committee

Printing Technology Uses Sound Waves to Control Size of Liquid Droplets

TBMG-3370202/01/2019

Liquid droplets are used in many applications, from printing ink on paper to creating microcapsules for drug delivery. Inkjet printing is the most common technique used to pattern liquid droplets, but it's only suitable for liquids that are roughly ten times more viscous than water. Many fluids of interest to researchers are far more viscous; for example, biopolymer and cell-laden solutions that are vital for biopharmaceuticals and bioprinting are at least 100 times more viscous than water. Some sugar-based biopolymers could be as viscous as honey, which is 25,000 times more viscous than water. The viscosity of these fluids also changes dramatically with temperature and composition, making it more difficult to optimize printing parameters to control droplet sizes.

Carbon Fiber/Epoxy Mold with Embedded Carbon Fiber Resistor Heater - Case Study

05-11-02-001104/07/2018

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

Researchers Develop Flexible, Stretchable Photonic Devices

TBMG-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.

Fluorinated Alkyl Ether Epoxy Resin Compositions and Applications Thereof

TBMG-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.

Dental Material Resists Plaque, Kills Microbes

TBMG-2819912/27/2017

Researchers have evaluated a new dental material tethered with an antimicrobial compound that not only kills bacteria but also resists biofilm growth. In addition, unlike some drug-infused materials, it is effective with minimal toxicity to the surrounding tissue, as it contains a low dose of the antimicrobial agent that kills only the bacteria that come in contact with it.

POTTING COMPOUND, EPOXY Bisphenol A-Type Unfilled, Room Temperature Cure, Semiflexible

AMS3731/10C (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

Resistive Heating-Assisted Infiltration and Cure (RHAIC) for Polymer/Carbon Nanotube Structural Composites

TBMG-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.

Adam Sidor, NASA Research Fellow, Georgia Institute of Technology, Atlanta, GA

TBMG-2710206/20/2017

Thermal Protection Systems (TPS) — heatshields — form the outer surface of spacecraft and provide protection as the vehicle plunges through planetary atmospheres. Conformal ablative materials are currently being developed to improve TPS performance. Adam Sidor is developing a fresh approach to designing and manufacturing these materials to produce larger tile sizes while reducing labor, cost, and waste.

Polyimides Derived from Novel Asymmetric Benzophenone Dianhydrides

TBMG-2685105/01/2017

NASA's Glenn Research Center invites companies to license or establish partnerships to develop its patented high-temperature, low-melt imide resins for fabrication of automotive components. Produced by a solvent-free melt process, these resins exhibit high glass transition temperatures (Tg = 370 to 400 °C), low melt viscosities (10 to 30 poise), long pot-life (1 to 2 hours), and can be easily processed by low-cost RTM and vacuum-assisted resin transfer molding (VARTM). These RTM resins melt at 260 to 280 °C, and can be cured at 340 to 370 °C in 2 hours without releasing any harmful volatile compounds.

Tire Tread Performance Modification Utilizing Polymeric Additives

2017-01-150203/28/2017

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 Orientation

2017-01-049803/28/2017

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 Parts

J1344_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

Mechanoresponsive Healing Polymers

TBMG-2634802/01/2017

NASA's Langley Research Center is developing an innovative self-healing resin that automatically reacts to mechanical stimuli. Current structural materials are not self-healing, making it necessary to depend on complicated and potentially destructive repair methods and long down times. Unlike other proposed self-healing materials that use microencapsulated healing agents, this technology utilizes viscoelastic properties from inherent structure properties. The resulting technology is a self-healing material with rapid rates of healing and a wide range of use temperatures.

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 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 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 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 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 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

Cloth, Organic Fiber, High Modulus Epoxy Resin Impregnated OC Style 181, 175 (350)

AMS3903/2B (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

Potting Compound, Epoxy Bisphenol A-Type Unfilled, Room Temperature Cure

AMS3731/1C (Current)09/22/2016

This specification covers a unfilled, room-temeperature-polymerizing epoxy resin formulation, supplied as a two-component system.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Flexible, Thermal Shock Resistant, Heat Cure

AMS3731/9C (Current)09/22/2016

This specification covers a flexibilized epoxy resin formulation, supplied as a two-component system, requiring an oven cure for attainment of maximum properties.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Filled, Heat Cure, Low CTE Thermal Shock Resistant

AMS3731/2D (Current)09/22/2016

This specificiation covers a filled epoxy resin formulation, supplied as a two-component system, requiring an oven cure for attainment of maximum properties.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Syntactic Foam, Heat Cure

AMS3731/6C (Current)09/22/2016

This specification covers a glass or silica micosphere-filled epoxy resin formulation, supplied as a two-component system, requiring an oven cure for attainment of maximum properties.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Filled, Heat Cure, High HDT

AMS3731/8C (Current)09/22/2016

This specification covers an epoxy resin formulation supplied as a two-component system, requiring an oven cure for attainment of maximum properties.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Impregnating Resin, Heat Cure, Single Component

AMS3731/4C (Current)09/22/2016

Requiring an oven cure for attainment of maximum properties.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Filled, Room Temperature Cure, Low Exotherm

AMS3731/5C (Current)09/22/2016

This specification covers a filled, room-temperature-polymerizing epoxy resin formulation, supplied as a two-component system.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Filled, Heat Cure, Machinable

AMS3731/3C (Current)09/22/2016

This specification covers an epoxy resin formulation with fillers such as calcium carbonate, supplie as a two-component system, requiring an oven cure for attainment of maximum properties.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type Filled, Room Temperature Cure, Low Shrinkage

AMS3731/7C (Current)09/22/2016

This specification covers a filled, room-temperature-polymerizing epoxy resin formulation, supplied as a two-component system.

AMS P Polymeric Materials Committee

Potting Compound, Epoxy Bisphenol A-Type

AMS3731C (Current)09/22/2016

This specification and its supplementary detail specifications cover epoxy resin formulations based on diglycidyl ether of bisphenol A with an epoxide equivalent of 175-195. When properly mixed and cured, these resisns produce a rigid or flexible product.

AMS P Polymeric Materials Committee

Flexible Ablator for Thermal Protection

TBMG-2535009/01/2016

NASA has developed a class of low-density, flexible ablators that can be fabricated into heat-shields capable of being packaged, stowed, and deployed in space. The key characteristics of this new ablative thermal protection system (TPS) are its flexibility, conformability, and tailor-ability. Flexibility allows the material to be stowed in the shroud of a launch vehicle and deployed in space, without compromising functionality. Conformability allows the material to be attached to a curved surface without precise and expensive machining. Tailor-ability allows the density and composition to be optimized for the requirements. This flexible TPS can be used to cover and thermally protect a large, blunt shape that provides aerodynamic drag during hyper-velocity atmospheric flight. It can be used with minimal modification for large aeroshells whose deployment relies mainly on mechanical means and through inflation. Such devices are called Hypersonic Inflatable Aerodynamic Decelerators (HIADs

Aromatic Thermosetting coPolyester (ATSP) Composites for High-Temperature and Cryogenic Applications

07/01/2016

Advanced composite materials processable by cost-effective manufacturing play an important role in developing lightweight structures for future space and planetary exploration missions. With the growing demand for improved performance in the aerospace sector, advances in polymer systems with extreme thermomechanical properties are critical in providing excellent retention of performance in high-temperature environments, and high resistance to microcracking at cryogenic temperatures.

Type 13 10% Polyimide Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

AMS3678/13A (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 10% polyimide in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 12 10% Mineral, 2.5% Molybdenum Disulfide Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

AMS3678/12A (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 10% mineral and 2.5% molybdenum disulfide in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 11 10% Aromatic Polymer Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

AMS3678/11A (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 10% aromatic polymer in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 10 Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with 15% Carbon Fiber

AMS3678/10B (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with carbon fiber in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 2 15% Graphite Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

AMS3678/2B (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 15% graphite in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 1 Virgin Polytetrafluoroethylene (PTFE) Moldings and Extrusions

AMS3678/1C (Current)02/29/2016

This specification covers an unfilled grade of virgin polytetrafluoroethylene (PTFE) resin in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 16 15% Polyimide Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

AMS3678/16A (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 15% polyimide in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 15 15% Aromatic Polymer Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

AMS3678/15A (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 15% aromatic polymer in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 5 Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with Pigment

AMS3678/5B (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with inorganic pigment in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

Type 7 Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions with 25% Carbon and Graphite

AMS3678/7B (Current)02/29/2016

This specification covers a polytetrafluoroethylene (PTFE) resin filled with carbon and graphite in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

AMS P Polymeric Materials Committee

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