Experimental and Numerical Simulation Study of Plasticity-Induced and Roughness-Induced Fatigue Crack Closure

Abstract:

In this study, fatigue crack closure behavior was investigated in the aluminum alloy 6061-T6 and the carbon steel JIS. S25C. It was found that crack closure in the aluminum alloy 6061-T6 showed the characteristics of plasticity-induced fatigue crack closure (PIFCC), whereas the carbon steel JIS. S25C showed the characteristics of roughness-induced fatigue crack closure (RIFCC). The experiments included the determination of the crack-opening levels K_op as a function of stress intensity factor range ΔK and the effect of surface removal on the crack-opening level. In order to simulate the behaviors of the plasticity-and the roughness-induced fatigue crack closure, the finite element method was adopted. The results of FEM were in good agreement with the experimental results. It was cconcluded that at a given yield strength level , a low Youngs modulus and a low work-hardening coefficient will favor PIFCC, whereas a high Youngs modulus and a high work-hardening coefficient will favor RIFCC.

• Periodical: Advanced Materials Research (Volumes 891-892)
• Pages: 307-312
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.891-892.307
• Online since: March 2014
• Authors: Kenichi Masuda, Sotomi Ishihara, Yuya Sugai, A.J. McEvily
• Keywords: Crack Closure, Fatigue Crack, Plasticity Induced Crack Closure, Roughness Induced Crack Closure

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