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Technical Brief

An Improved Cumulative Damage Criterion for Preloaded Threaded Fasteners

[+] Author and Article Information
Sayed A. Nassar

Fellow ASME
Fastening and Joining Research Institute,
Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

Rania A. Ali

Fastening and Joining Research Institute,
Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

Contributed by the Reliability, Stress Analysis, and Failure Prevention Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received August 28, 2012; final manuscript received April 22, 2014; published online May 12, 2014. Assoc. Editor: Kwun-Lon Ting.

J. Mech. Des 136(7), 074502 (May 12, 2014) (5 pages) Paper No: MD-12-1434; doi: 10.1115/1.4027511 History: Received August 28, 2012; Revised April 22, 2014

An improved cumulative damage criterion is proposed for preloaded threaded fasteners. The proposed criterion takes into account the effect of bolt mean stress, damage history, and the loading sequence. Baseline mean stress-adjusted fatigue curves are first established for two sizes of A286 steel bolts with round socket heads. Fatigue curves are subsequently lowered due to calculable partial damage that each step of a loading spectrum. Theoretical results are experimentally validated using a three-stage loading spectrum that is applied in a low-to-high (L–H) or high-to-low (H–L) loading sequence.

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Copyright © 2014 by ASME
Topics: Stress , Damage , Fasteners , Fatigue
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References

Figures

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Fig. 1

Schematic fatigue curves for undamaged and partially damaged specimens

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Fig. 2

MTS 810 fatigue testing system and test fixture

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Fig. 3

Comparison of proposed cumulative damage predictions with experimental data: Sm = 0.21 Su

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Fig. 4

Comparison of proposed cumulative damage predictions with experimental data: Sm = 0.32 Su

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Fig. 5

Comparison of proposed cumulative damage predictions with experimental data: Sm = 0.54 Su

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Fig. 6

Comparison of proposed cumulative damage predictions with experimental data: Sm = 0.7 Su

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Fig. 7

Schematic for loading sequences L–H and H–L

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