Probabilistic Simulation of Shape Instability Based on the True Microstructure Model
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.
Keywordsshape instability failure low-cycle fatigue true microstructure finite element analysis disposable structural elements
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).
- 10.Y. Liu and D. Chen, “Measurement of material mechanical properties using nano-indentation and finite element simulation,” J. Wuhan Univ. Technol., 27, 690–693 (2003).Google Scholar
- 11.C. O. Frederick and P. J. Armstrong, A Mathematical representation of the Multiaxial Bauschinger Effect, Report RD/B/N 731, Central Electricity Generating Board (1966).Google Scholar
- 17.N. Ohno, “Constitutive modeling of cyclic plasticity with emphasis on ratcheting,” Int. J. Mech. Sci., 40, Nos. 2–3, 251–261 (1998).Google Scholar
- 18.N. Ohno, M. Abdel-Karim, M. Kobayashi, and T. Igari, “Ratchetting characteristics of 316FR steel at high temperature, part I: Strain-controlled ratchetting experiments and simulations,” Int. J. Plasticity, 14, Nos. 4–5, 355–372 (1998).Google Scholar