Introduction of a reverse simulation approach to identify the fatigue SIF crack arrest threshold from fretting cracking experiments

摘要

Fretting is a small amplitude oscillatory movement appearing between two contacting surfaces subjected to vibrations.This phenomenon may generate crack growth propagation.The aim of the present work is to estimate the ΔKIth (Crack arrest stress intensity factor) related to the crack arrest condition of a material subjected to partial slip fretting loadings by coupling experimental results and numerical simulations.The study is limited to cylinder/plane models TA6V/Al-alloys.In this approach,fretting tests are first performed for each configuration to obtain the crack length as a function of fretting cycles in order to establish the length of the arrested crack.Then an automatic program based on FEM simulations of the experimental test is developed to estimate the stress intensity factor corresponding to the crack arrest.Using a reverse analysis,the ΔKth corresponding to the crack arrest condition is identified and different materials are compared.