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Quantification of Clamp Loss and Subsequent Loosening of Automotive Hub-Knuckle Joints under Time-Varying Proving Ground Loading

FCA US LLC-Sandip Datta, Parag Nittur
  • Technical Paper
  • 2020-01-0181
To be published on 2020-04-14 by SAE International in United States
Threaded fasteners or bolted joints are used extensively in automotive assemblies. There are standard procedures to evaluate joint performance under block cycles or road loads. The deciding load case for such joint design is slippage analysis of the joint.There are studies done to evaluate the theoretical and experimental behavior of these joints. There are different ways of understanding the interaction between the bolt and the nut under different loading scenarios. However, none have provided a satisfactory method of quantifying bolt loosening or loss of clamp load under cyclic loading, where no slippage is observed.Under varying loads, initial relaxation of the joint is followed by a loss of clamping load. Below a critical value, complete loss of clamping load progresses very rapidly and this results in a loose joint. The loss of clamping load below the critical value happens at a transition stage when both elastic deformations of the bolt as well as external moments contribute to rapid loosening.This study provides an overall understanding of geometric parameters that contribute to sudden loss of clamping load and…
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CONNECTOR, PLUG, ELECTRIC, STRAIGHT, SOLDER CONTACTS, AN TYPE

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AS31061C
  • Current
Published 2020-03-24 by SAE International in United States
No Abstract Available.
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Aerospace Standard Test Methods for Aerospace Sealants Two-Component Synthetic Rubber Compounds

AMS G9 Aerospace Sealing Committee
  • Aerospace Standard
  • AS5127/1D
  • Current
Published 2020-03-18 by SAE International in United States
This SAE Aerospace Standard (AS) describes test methods to determine the application and performance properties of two-component sealing compounds. It shall be used in conjunction with AS5127 and the applicable material specification. When modifications to these test methods are called out in material specifications, the material specification shall take precedence.
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COUPLING, V-RETAINER, DOUBLE LATCH, TYPE I STANDARD PROFILE

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1895/22D
  • Current
Published 2020-02-25 by SAE International in United States
No Abstract Available.
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COUPLING, V-RETAINER, DOUBLE LATCH, TYPE II LOW PROFILE

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1895/20D
  • Current
Published 2020-02-25 by SAE International in United States
No Abstract Available.
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Plating, Silver Copper Strike, Low Bake

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS2412L
  • Current
Published 2020-01-16 by SAE International in United States
This specification covers the requirements for silver deposited on metal parts with a copper strike between the basis metal and the silver deposit.
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TS128 "All-Metal" Self-Locking Nuts (UNJ Threads) 1100 MPa (160,000 lbf/in²) Minimum Tensile Strength at Room Temperature

Engine and Airframe Technical Standards Committee (TSC)
  • SAE ITC E&A Standard
  • TS128-7
  • Current
Published 2019-10-16 by SAE Industry Technologies Consortia in United States

No scope available.

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TS128AR Amendment Record for Technical Specification No. TS128

Engine and Airframe Technical Standards Committee (TSC)
  • SAE ITC E&A Standard
  • TS128AR-7
  • Current
Published 2019-10-16 by SAE Industry Technologies Consortia in United States

No scope available.

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NUT, SELF-LOCKING, EXTENDED DOUBLE HEXAGON, REDUCED FLANGE, DRY FILM LUBE, UNS S66286, CLASS: 160 KSI/800 °F

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3486E
  • Current
Published 2019-10-15 by SAE International in United States
No Abstract Available.
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NUT, SLOTTED, HEXAGON, SHEAR - UNS S66286, 130 KSI MIN

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS9363C
  • Current
Published 2019-10-14 by SAE International in United States
No Abstract Available.
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