MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Fatigue Crack Initiation Simulation in Pure Iron Polycrystalline Aggregate
Fabien BriffodTakayuki ShiraiwaManabu Enoki
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2016 Volume 57 Issue 10 Pages 1741-1746

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Abstract

A numerical study was conducted to evaluate the fatigue crack initiation stage in pure α-iron. A two-dimensional synthetic polycrystalline aggregate was generated with Voronoi tessellation to represent the microstructure. Low-cycle fatigue experiments under fully reversed strain-controlled loading were conducted for different strain amplitudes. The stable stress-strain hysteresis loops were used to calibrate a non-linear kinematic hardening model for metal plasticity suitable for cyclic simulations. An existing procedure based on the Tanaka-Mura model for fatigue crack initiation was extended to body-centered cubic lattice to account for two orthogonal slip systems as potential crack locations. This procedure was applied for fully reversed fatigue simulations with various stress amplitudes ranging from low-cycle to high-cycle fatigue regime. The effect of the stress level on the crack morphology and the fatigue crack initiation life was evaluated. Finally the applicability and limitations of the proposed procedure was discussed.

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© 2016 The Japan Institute of Metals and Materials
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