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A Comparative Evaluation of $K_{op}$ Determination and $\Delta{K}_{eff}$ Estimation Methods  

Kang, Jae-Youn (Korea Institute of Machinery ＆ Materials,)
Song, Ji-Ho (Department of Automation and Design Engineering, Korea Advanced Institute of Science and Technolog)
Koo, Ja-Suk (Department of Automation and Design Engineering, Korea Advanced Institute of Science and Technolog)
Park, Byung-Ik (Korea Institute of Machinery ＆ Materials)
Publication Information
Journal of Mechanical Science and Technology / v.18, no.6, 2004 , pp. 961-971 More about this Journal
Abstract
Methods for determination of the crack opening stress intensity factor ($K_{op}$) and for estimation of the effective stress intensity factor range ($\Delta{K}_{eff}$) are evaluated for crack growth test data of aluminum alloys. Three methods of determining $K_{op}$, visual measurement, ASTM offset compliance method, and the neural network method proposed by Kang and Song, and three methods of estimating $\Delta{K}_{eff}$, conventional, the 2/PIO and 2/PI methods proposed by Donald and Paris, are compared in a quantitative manner by using evaluation criteria. For all $K_{op}$ determination methods discussed, the 2/PI method of estimating $\Delta{K}_{eff}$ provides good results. The neural network method of determining $K_{op}$ provides good correlation of crack growth data. It is recommended to use 2/PI estimation with the neural $K_{op}$ determination method. The ASTM offset method used in conjunction with 2/PI estimation shows a possibility of successful application. It is desired to improve the ASTM method.
Keywords
Crack Closure; Effective Stress Intensity Factor Range; Evaluation Criteria; Fatigue Crack Growth; Opening Load;
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