Browse Topic: Fasteners

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The applications of Acoustic Black Holes to attenuation of Coach/Bus Frame Structure Vibrations2025-01-006505/05/2023
Abstract An acoustic black hole (ABH) is a structure whose cross-sectional thickness decreases exponentially to zero, and the phase velocity and group velocity of wave propagation in those structure acoustic black holes decrease as the thickness decreases until they are zero. ABH produce some very magical physical phenomena. For example, because the wave velocity decreases to zero, the wave can never reach the center of the ABH, so the wave propagation in the acoustic black hole has neither refraction nor reflection; that is to say the vibration wave will not go through the acoustic black hole. As a result, the wave energy is concentrated in the center of the ABH. The arrangements of those acoustic black holes in the structures could change the directions of the vibrational wave propagation in the structures at NVH engineers’ wills. These amazing phenomena could play a magical role in reducing structural vibration, structural noise radiation and structure-borne noise. Basic structures
Huang, Xianli
Locking Side Pull Hoist RingTBMG-4691611/01/2022
null, null
Metallic Materials Properties Development and Standardization (MMPDS) Handbook - 17B-98907/04/2022
The Metallic Materials Properties Development and Standardization MMPDS-17 supersedes MMPDS-16 and prior editions of the MMPDS Handbook as well as all editions of MIL-HDBK-5, Metallic Materials and Elements for Aerospace Vehicle Structures Handbook that was maintained by the U.S. Air Force. The last edition, MIL-HDBK-5J was cancelled by the U.S. Air Force in March 2006. This document contains design information on the mechanical and physical properties of metallic materials and joints commonly used in aircraft and aerospace vehicle structures. All information contained in this Handbook has been reviewed and approved using a standardized process. The development and ongoing maintenance process involves certifying agencies, including the FAA, DoD, and NASA, and major material suppliers and material users worldwide. The information and procedures in this Handbook are continuously reviewed and modified or removed as determined to be appropriate. With advances in materials and fastener
Burgers, Phillip
Metallic Materials Properties Development and Standardization (MMPDS) Handbook - 17B-989-TEST-REC07/04/2022
The Metallic Materials Properties Development and Standardization MMPDS-17 supersedes MMPDS-16 and prior editions of the MMPDS Handbook as well as all editions of MIL-HDBK-5, Metallic Materials and Elements for Aerospace Vehicle Structures Handbook that was maintained by the U.S. Air Force. The last edition, MIL-HDBK-5J was cancelled by the U.S. Air Force in March 2006. This document contains design information on the mechanical and physical properties of metallic materials and joints commonly used in aircraft and aerospace vehicle structures. All information contained in this Handbook has been reviewed and approved using a standardized process. The development and ongoing maintenance process involves certifying agencies, including the FAA, DoD, and NASA, and major material suppliers and material users worldwide. The information and procedures in this Handbook are continuously reviewed and modified or removed as determined to be appropriate. With advances in materials and fastener
Burgers, Phillip
Additive Manufacturing of Threaded Parts for Aerospace applications2022-26-117005/26/2022
Additive manufacturing also known as 3D printing and rapid prototyping is ‘the process of joining materials to make objects from 3D model data, generally layer upon layer. It is a suitable process to produce complex net shape parts, and prototypes. Additive Manufacturing empowers both design and industrial revolution, in various industrial sectors such as aerospace, energy, automotive, medical, tooling and consumer goods. In aerospace today, Additive Manufacturing is bringing lots of advantages and applications but manufacturing threaded fasteners or parts with threads is not much explored. In this study we are exploring this and trying to establish manufacturing threaded parts using additive manufacturing. This is going to give many benefits like reduced part cost, manufacturing and installation time and increased safety. The key features of such parts which makes AM as a best manufacturing method are – angled internal grove, provision for sealant for complete sealing, customized
Shetty, Dr. Kishora, Murthy, Harsha
Handling Loading Dynamics in Chassis Bolted Connections Through Friction Increase2022-01-024103/29/2022
With the trend towards electrification, the number of vehicle variants (ICE, hybrid, BEV) for a like model are increasing, or for the case of BEVs, there are multiple models utilizing the same skateboard design. These vehicle variants can create challenges on how to handle the differences in weight and loading dynamics while utilizing the same carry-over chassis design. In some cases, the solution to this problem can be solved by increasing the shear capacity of the critical bolted connection. This can be done by increasing the static coefficient of friction between the mating components. FEM results are shared on a friction enhancement solution and the difference it can make on load capacity for a weight bearing connection in chassis. The solution is effective on all common material types including aluminum and e-coated steel. Comparisons are made to bolt design solutions, proving that friction increase can significantly improve the performance of the bolted connection without a need
Jackowski, John, Milton, Chuck, Ness, Jon, Grimm, Florian
Methodology and application on load monitoring using strain-gauged bolts in brake calipers2022-01-112103/29/2022
As technology evolves, the number of sensors and available data on vehicles grow exponentially. In this context, it is essential to use sensors for monitoring key components, increasing safety and reliability, and gathering data useful for mechanical dimensioning and control systems. This paper presents an application of strain-gauged bolts brake calipers fixation of two electric vehicles. With this approach it was possible to obtain the loads applied to the brake pads and correlate them with braking behavior, therefore gaining insights on braking conditions and system state. The goal of the study is analyzing the strengths and limitations of the method and proposing developments to deploy it in real applications. This topic is particularly important and novel for electric vehicles, where powertrains can create positive and negative torques and generate complex interactions with braking system. Strain-gauges are a long-known technology applied in many fields, and its usage in bolts and
de Carvalho Pinheiro, Henrique, Sisca, Lorenzo, Carello, Massimiliana, Ferraris, Alessandro, Airale, Andrea Giancarlo, Falossi, Marco, Carlevaris, Alberto
Development & Deployment of Bolted joint integrity evaluation for Automotive suspension joints2022-01-092803/29/2022
Bolted joints are the most commonly used joints in automotive suspension assemblies. They are expected to retain the strength over the course of useful life of the vehicle and contribute to durability in a big way through reduction of stress amplitudes. Any sort of loosening or slip or breakage in these joints can lead to noise or catastrophic failures. In the past, such issues were addressed through thumb rules & design guidelines. However, with the focus on first-time right Tests with reduced Validation time it has become important to upfront predict the suspension joint integrity through simulation. Toward this objective, a novel approach was developed to upfront simulate the suspension joint integrity for bolted joints. This approach considers various parameters like bolt preload, tolerance stackup of the parts in the joint, coefficients of friction of various interfaces, quality of contact & effect of deformation at the thread interface on joint integrity. Also, key parameters
Chaudhari, Varun N., Nagappan, Rajkumar, Kangde, Suhas
Chevrolet Bolt Electric Vehicle Model Validated with On-The-Road Data and Applied to Estimating the Benefits of a Multi-Speed Gearbox2022-01-080203/29/2022
This paper presents a model for predicting the energy consumption of a 2017 Chevy Bolt electric vehicle. The model is validated using more than 100 measured drive cycles covering in excess of 6,000 miles of driving and temperatures from 15 to 90 ⁰F. The mechanical road load acting on the vehicle is calculated via ABC parameters from the publicly available US Environmental Protection Agency (EPA) Annual Certification Data database. The vehicle model includes wheel diameter, gear ratio, rated electric machine torque and power, 12V accessory load based off measurements, measured electric machine efficiency obtained from a publication from General Motors, modelled inverter efficiency, assumed gearbox efficiency, and a battery model. To ensure accuracy under real-world conditions, road grade, temperature effects, and heating and cooling energy are included as well. The model predicts a 0 to 60mph acceleration of the vehicle of 6.6 seconds, just 0.1 seconds greater than the rated value. The
Machado, Fabricio, Kollmeyer, Phillip, Emadi, Ali
Influence of Manufacturing Processes on the Structural behavior of Truck Frame Rail Sections2022-01-091403/29/2022
The sequence of manufacturing processes involved in the making of ladder shaped truck frame rail assembly leave certain amount of manufacturing and assembly imperfections in the form of plastic deformation and residual stresses in some areas of frame rail ‘C’ sections. The plastic deformation and the resulting residual stress should not be allowed to cross the safer limit as it would affect the structural behaviour of the frame rail while interacting with the externally induced loading stresses from extreme road operating conditions. If the combined stress level crosses the yield limit of the frame material, it may lead to premature failure of frame rail much before it gives the expected life. One such manufacturing induced premature failure in a truck frame rail assembly during proving ground trials was studied in detail using experimental analyses and presented in this paper. As part of this study, the local material crowding due to plastic deformation occurring at certain sections
K, Chinnaraj, KR, Balaji, Gopal, Gopi
BOLT, MACHINE - DOUBLE HEXAGON, EXTENDED WASHER HEAD, CORROSION AND HEAT RESISTANT STEEL, UNS S66286, 130 KSI MIN, .5000-20UNJF-3AAS9561 (Current)10/28/2021
E-25 General Standards for Aerospace and Propulsion Systems
BOLT, MACHINE - DOUBLE HEXAGON, EXTENDED WASHER HEAD, CORROSION AND HEAT RESISTANT STEEL, UNS S66286, 130 KSI MIN, .4375-20 UNJF-3AAS9560 (Current)10/28/2021
E-25 General Standards for Aerospace and Propulsion Systems
BOLT, MACHINE – DOUBLE HEXAGON, EXTENDED WASHER HEAD, DRILLED, PD SHANK, UNS S66286, SILVER PLATED, .5625-18UNJF-3AAS9580 (Current)10/26/2021
E-25 General Standards for Aerospace and Propulsion Systems
BOLT, MACHINE - DOUBLE HEX HEAD, REDUCED SHANK, UNS N07718 - 185 KSIAS3650C10/12/2021
SCOPE IS UNAVAILABLE.
E-25 General Standards for Aerospace and Propulsion Systems
Hydraulic Pump and Motor Mounting and Drive DimensionsJ744_202110 (Current)10/08/2021
This SAE Standard applies to hydraulic pumps and motors used on off-road self-propelled work machines as described in SAE J1116.
CTTC C1, Hydraulic Systems
Hydraulic Pump and Motor Mounting and Drive DimensionsJ744_202110-TEST-REC (Historical)10/08/2021
This SAE Standard applies to hydraulic pumps and motors used on off-road self-propelled work machines as described in SAE J1116.
CTTC C1, Hydraulic Systems
BEARING, ROLLER, NEEDLE, TRACK ROLLER INTEGRAL STUD, SEALED, TYPE VIII ANTIFRICTION, INCHAS21440C (Current)10/06/2021
ACBG Rolling Element Bearing Committee
CONNECTORS, ELECTRICAL, RECTANGULAR, RECEPTACLE, CRIMP CONTACTS, (DUAL INSERT, TYPE IV, CLASS 1 (−65 TO +125 °C), SERIES 2, SHELL DESIGNATOR A, CLINCH NUT MOUNT)AS81659/71B (Current)09/22/2021
AE-8C1 Connectors Committee
Glossary - Automatic Belt TensionerJ2198_202109 (Current)09/10/2021
This glossary was written to provide a consistent and uniform definition of terms used in describing an automatic belt tensioner as it applies to an automotive accessory drive system.
Belt Drive (Automotive) Systems Committee
T-Bolt and Eye Bolt, A286 CRES, 1000 °F Fatigue RatedAS4108D (Current)09/01/2021
This specification defines the requirements for A286 CRES T-bolts and eye bolts, with room temperature tensile strength of a minimum of 160000 psi, for use with clamps and V-band couplings at 1000 °F maximum ambient temperature.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
T-Bolt and Eye Bolt, A286 CRES, 1000 °F Fatigue RatedAS4108D-TEST-REC (Historical)09/01/2021
This specification defines the requirements for A286 CRES T-bolts and eye bolts, with room temperature tensile strength of a minimum of 160000 psi, for use with clamps and V-band couplings at 1000 °F maximum ambient temperature.
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
Impact of Mode Shapes on Experimental Loss Factor Estimation in Automotive Joints2021-01-111008/31/2021
This paper presents the experimental work carried out on single-lap joints fastened together with bolts and nuts to investigate the contribution of mode shapes, and the effect that bolt sizes has in dissipating energy in built-up structures. Five different bolt sizes are chosen to assemble five single-bolted single-lap joints using aluminum plates. An analogous monolithic solid piece carved from the same aluminum material is used to determine the material damping and compare it against the damping from bolted joints. The dynamic response of all structures is captured under free-free boundary conditions, and the common modes are analyzed to understand the contribution and primary source of damping in the same range of the sampling frequency. This investigation has revealed that the source of damping in the joints is heavily linked to the mode shapes of the structure and structural damping (also referred to as material damping) contributes more during specific mode shapes compared to the
Sanjeev, Shaan, O'Boy, Dan J., Cunningham, Paul, Fisher, Steve
ASSEMBLY NUT, PLATE, REMOVABLE SELF-LOCKING NUTAS3550A (Current)08/16/2021
E-25 General Standards for Aerospace and Propulsion Systems
Steel Self-Drilling Tapping ScrewsJ78_202107 (Current)07/28/2021
This SAE Standard covers the dimensional and general specifications, including performance requirements, for carbon steel self-drilling tapping screws suitable for use in general applications having point Styles 2, 3, 4, and 5. It is the objective of this document to ensure that carbon steel self-drilling tapping screws, by meeting the mechanical and performance requirements specified, shall drill a hole and form or cut mating threads in materials into which they are driven without deforming their own thread and without breaking during assembly.
Fasteners Committee
Steel Self-Drilling Tapping ScrewsJ78_202107-TEST-REC (Historical)07/28/2021
This SAE Standard covers the dimensional and general specifications, including performance requirements, for carbon steel self-drilling tapping screws suitable for use in general applications having point Styles 2, 3, 4, and 5. It is the objective of this document to ensure that carbon steel self-drilling tapping screws, by meeting the mechanical and performance requirements specified, shall drill a hole and form or cut mating threads in materials into which they are driven without deforming their own thread and without breaking during assembly.
Fasteners Committee
BOLT, SPLINE DRIVE SPECIAL EXTENDED WASHER HEAD, REDUCED HEAD, PD SHANK, AMS5708, METRICMA3448A07/12/2021
E-25 General Standards for Aerospace and Propulsion Systems
SCREW, MACHINE, 100° CSK, FLAT HEAD, OFFSET CRUCIFORM RECESS, FULL SHANK, UNS S66286, MJ THREAD, METRICMA4189A07/12/2021
SCOPE IS UNAVAILABLE.
E-25 General Standards for Aerospace and Propulsion Systems
COUPLING, V-RETAINER, SINGLE LATCH, TYPE II LOW PROFILEAS1895/4G (Historical)06/22/2021
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
COUPLING, V-RETAINER, SINGLE LATCH, TYPE I STANDARD PROFILEAS1895/1G (Historical)06/22/2021
G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
CONNECTOR, RECEPTACLE, ELECTRIC, SOLDER TYPE, JAM NUT MOUNTING, PUSH-PULL, COUPLING, SERIES 1 (CLASS E, P, J AND H)AS31341A (Current)05/19/2021
AE-8C1 Connectors Committee
CONNECTOR, RECEPTACLE, ELECTRIC, SOLDER TYPE, JAM NUT MOUNTING, PUSH-PULL, COUPLING, SERIES 1 (CLASS E, P, J AND H)AS31341A-TEST-REC (Historical)05/19/2021
AE-8C1 Connectors Committee
CONNECTOR, RECEPTACLE, ELECTRIC, CRIMP TYPE, JAM NUT MOUNTING, PUSH-PULL, COUPLING, SERIES 2 (CLASS E AND J)AS31441A (Current)05/18/2021
AE-8C1 Connectors Committee
CONNECTOR, RECEPTACLE, ELECTRIC, CRIMP TYPE, JAM NUT MOUNTING, PUSH-PULL, COUPLING, SERIES 2 (CLASS E AND J)AS31441A-TEST-REC (Historical)05/18/2021
AE-8C1 Connectors Committee
Disc Wheel and Hub or Drum Interface Dimensions - Truck and BusJ694_202104 (Current)04/30/2021
This SAE Recommended Practice contains dimensions and their tolerances concerning disc wheel to hub or drum interface areas for truck and bus applications. Disc wheels designed only for single wheel applications (not dual wheels) for light trucks and special or less common applications are not covered in this document.
Truck and Bus Wheel Committee
Disc Wheel and Hub or Drum Interface Dimensions - Truck and BusJ694_202104-TEST-REC (Historical)04/30/2021
This SAE Recommended Practice contains dimensions and their tolerances concerning disc wheel to hub or drum interface areas for truck and bus applications. Disc wheels designed only for single wheel applications (not dual wheels) for light trucks and special or less common applications are not covered in this document.
Truck and Bus Wheel Committee
TERMINAL JUNCTION SYSTEM, TERMINAL JUNCTION BLOCKS, SECTIONAL, GROUNDING MODULES, STUD TYPE MOUNTING, SERIES IAS81714/27B (Current)04/22/2021
AE-8C2 Terminating Devices and Tooling Committee
Bolts and Screws, Steel, UNS S66286 Classification: 130 ksi/1200 °F 1800 °F Solution Heat Treated, Aged After Roll Threaded Procurement Specification forAS7478E (Historical)04/09/2021
This procurement specification covers bolts and screws made from a corrosion and heat resistant, age hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286.
E-25 General Standards for Aerospace and Propulsion Systems
Bolts and Screws, Steel, UNS S66286 Classification: 130 ksi/1200 °F 1800 °F Solution Heat Treated, Aged After Roll Threaded Procurement Specification forAS7478E-TEST-REC (Historical)04/09/2021
This procurement specification covers bolts and screws made from a corrosion and heat resistant, age hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286.
E-25 General Standards for Aerospace and Propulsion Systems
Bolts and Screws, Steel, Low Alloy Heat Treated, Roll ThreadedAS7452C (Historical)04/07/2021
This procurement specification covers aircraft quality bolts and screws made from a low alloy steel of the type identified under the Unified Numbering System as UNS G87400, and of a series of room temperature tensile strengths ranging from 125000 to 185000 psi.
E-25 General Standards for Aerospace and Propulsion Systems
Bolts and Screws, Steel, Low Alloy Heat Treated, Roll ThreadedAS7452C-TEST-REC (Historical)04/07/2021
This procurement specification covers aircraft quality bolts and screws made from a low alloy steel of the type identified under the Unified Numbering System as UNS G87400, and of a series of room temperature tensile strengths ranging from 125000 to 185000 psi.
E-25 General Standards for Aerospace and Propulsion Systems
BOLT, MACHINE - DOUBLE HEXAGON EXTENDED WASHER HEAD, PD SHANK, CUP WASHER LOCKED, CRES, UNS S66286, 130 KSI MIN, .3750-24 UNJF-3AAS9679C (Current)03/23/2021
E-25 General Standards for Aerospace and Propulsion Systems
BOLT, MACHINE-HEX HEAD-FULL SHANK, LONG THREAD, AMS5731, METRICMA3347A (Current)03/05/2021
E-25 General Standards for Aerospace and Propulsion Systems
BOLT, MACHINE-HEX HEAD-FULL SHANK, LONG THREAD, AMS5731, METRICMA3347A-TEST-REC (Historical)03/05/2021
E-25 General Standards for Aerospace and Propulsion Systems
Bolts, Screws, and Nuts - External Wrenching UNJ Thread, Inch - Design StandardAS1132K-TEST-REC (Historical)03/01/2021
The scope of this SAE Aerospace Standard (AS) is to define the following dimensional requirements for double hexagon, hexagon head and tee headed bolts, and nuts with AS8879 UNJ inch series threads primarily for use in propulsion systems. Design requirements are based on UNJC threads for sizes 0.1640 and smaller and UNJF threads for sizes 0.1900 and larger.
E-25 General Standards for Aerospace and Propulsion Systems
Bolts, Screws, and Nuts - External Wrenching UNJ Thread, Inch - Design StandardAS1132K (Current)03/01/2021
The scope of this SAE Aerospace Standard (AS) is to define the following dimensional requirements for double hexagon, hexagon head and tee headed bolts, and nuts with AS8879 UNJ inch series threads primarily for use in propulsion systems. Design requirements are based on UNJC threads for sizes 0.1640 and smaller and UNJF threads for sizes 0.1900 and larger.
E-25 General Standards for Aerospace and Propulsion Systems
Locking Side Pull Hoist RingTBMG-3851802/01/2021
Researchers have developed a Locking Side Pull Hoist Ring that presents a significant improvement on commonly used lifting hardware by eliminating the need for an operator to manually hold a workpiece in position and for additional custom rotation-locking fixtures. This new hoist ring is easily integrated into existing rigging configurations and is specifically designed for applications where the lift point must be mounted to the side of a workpiece that needs to be re-oriented and then locked into position while suspended.
BOLT, MACHINE - DOUBLE HEX EXTENDED WASHER HEAD, DRILLED, CLOSE TOL SHANK, AMS5643 (UNS S17400), 140 KSI, .5625-18 UNJF-3AAS3180B (Current)12/22/2020
E-25 General Standards for Aerospace and Propulsion Systems
2020 Create the Future Design Contest: Aerospace & Defense Category Winner — NiobiCon™TBMG-3820212/01/2020
Test for Evaluating the Torque-Tension Relationship of Both External and Internal Metric Threaded FastenersUSCAR10-3 (Current)11/19/2020
USCAR
TEST PROCEDURES FOR EVALUATING BOLT-LOAD RETENTION OF MAGNESIUM ALLOYSUSCAR35-1 (Current)11/19/2020
A bolt-load retention (BLR) test is a practical test to determine the bolt load of a fastener joint with time and at given temperatures. There are three types of BLR tests described in this standard, namely general-purpose test, design-purpose test, and screening material test. A general-purpose BLR test may be used for screening materials, while a design-purpose BLR test is usually used to verify the BLR behavior of a specific joint. The screening material test is an example of the general-purpose test for typical automotive applications.
USCAR
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