Shape instability belongs to one of significant types of violation for disposable structural elements under high-stress levels. Due to lack of fundamental data on materials, it is quite problematic to consider the shape instability in the design of disposable structural elements. The crystal plastic finite element method is proposed to investigate the dispersion of shape instability life data. It allows these data to be obtained from traditional material parameters. The shape instability behavior is described with the constitutive crystal model of plastic damage accumulation. Then, to improve the accuracy of life prediction, the new method is developed to construct the simulation model of true microstructure. A modeling algorithm based on the image processing technology is provided to reduce the virtual stresses from the transient crystal plastic modeling method. Comparison of experimental and predicted results shows good agreement at high stresses close to the elastic limit of the material.
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Acknowledgments
National Natural Science Foundation of China (51405101), the research and innovation fund of Harbin Institute of Technology (Grant Number HIT.NSRIF.2015 053), the China Postdoctoral Science Foundation (Grant Numbers 2014M561340 and 2016T90277) and Heilongjiang Postdoctoral Fund (Grant Number LBH-Z14100).
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Translated from Problemy Prochnosti, No. 1, pp. 56 – 63, January – February, 2018.
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Wu, G.C., Li, Y.F. & Wang, G.L. Probabilistic Simulation of Shape Instability Based on the True Microstructure Model. Strength Mater 50, 47–53 (2018). https://doi.org/10.1007/s11223-018-9941-5
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DOI: https://doi.org/10.1007/s11223-018-9941-5