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Research Papers: Contact Mechanics

Physics-Based Modeling for Lap-Type Joints Based on the Iwan Model

[+] Author and Article Information
Wanglong Zhan

School of Mechanical and
Automotive Engineering,
South China University of Technology,
Guangzhou 510640, Guangdong, China
e-mail: zhanwl1992@foxmail.com

Ping Huang

School of Mechanical and
Automotive Engineering,
South China University of Technology,
Guangzhou 510640, Guangdong, China
e-mail: mephuang@scut.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 15, 2017; final manuscript received February 28, 2018; published online April 5, 2018. Assoc. Editor: James R. Barber.

J. Tribol 140(5), 051401 (Apr 05, 2018) (7 pages) Paper No: TRIB-17-1278; doi: 10.1115/1.4039530 History: Received July 15, 2017; Revised February 28, 2018

This study proposed a physics-based heuristic modeling for the nonlinear constitutive relation of bolted joints based on the Iwan model accompanying with the rough surface contact theory. The approach led to an Iwan distribution function which possesses the tribology-related features of the contact interface. In particular, the break-free force distribution function of the Jenkins elements could be expressed in terms of height distribution of surface asperities. The model considered the contribution of elastically, elasto-plastically as well as plastically deformed asperities to the total tangential loads. Following this, constitutive relations for lap-type bolted joints and the corresponding backbone curves, hysteresis loops, and energy dissipation per cycle were obtained. A model application was implemented and the results were compared with the published experimental results. The proposed model agrees very well with the experimental results when the contact parameters met the actual contact situation. The obtained results indicated that the model can be used to study the tangential behaviors of rough surfaces.

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References

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Figures

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Fig. 1

Illustration of: (a) the uniform distribution of Ref. [15], (b) the distribution of Ref. [9], (c) Segalman's proposed distribution, and (d) the distribution of Ref. [11]

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Fig. 2

Schematic of the parallel-series Iwan model

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Fig. 3

Schematic diagram of contact between an equivalent rough surface and a rigid flat surface

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Fig. 4

Schematic diagram of a hysteresis loop

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Fig. 5

Iwan distribution functions for rough surfaces under different preloads: (a) N = 331 N and (b) N = 500 N

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Fig. 6

Backbone curves for initial loading under different preloads: (a) N = 331 N and (b) N = 500 N

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Fig. 7

Diagram of hysteresis loops for different displacement amplitudes. Other parameters: ψ = 4.25 and N = 331 N.

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Fig. 8

Comparison of present model and experimental fretting loops from bolted joint under different preloads

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Fig. 9

Comparison of energy dissipation obtained from experiments and present model simulations

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