期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.04.030
关键词
Fatigue crack initiation; Crystal plasticity; Microstructure-sensitive modeling; Tessellation; EBSD
类别
资金
- Council for Science, Technology and Innovation (CSTI)
- Cross-ministerial Strategic Innovation Promotion Program (SIP)
- JST
In this study, fatigue crack initiation in pure alpha-iron is investigated through a microstructure-sensitive framework. At first, synthetic microstructures are modeled based on an anisotropic tessellation that accounts for the information of the grains morphology extracted from electron backscatter diffraction (EBSD) analysis. Low-cycle fatigue experiments under strain-controlled conditions are conducted in order to calibrate a crystal plasticity model and a J(2) model including isotropic and kinematic hardening. A critical plane fatigue indicator parameter (FIP) based on the Tanaka-Mura model is then presented to evaluate the location and quantify the driving force for the formation of a crack. The FT is averaged over several potential crack paths within each grain defined by the intersection between a given slip plane and the plane of the model thus accounting for both the lattice orientation and morphology of the grain. Several fatigue simulations at various stress amplitudes are conducted using a sub-modeling technique for the attribution of boundary conditions on the polycrystalline aggregate models including an elliptic defect. The influence of the microstructure attributes and stress level on the location and amplitude of the PIP are then quantified and discussed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据