Patent ID: 7889840
Filing Date: 2011-02-15
Classification: B64F,G01N,G07C

Abstract:
1. A method for component damage prediction in real world service environments comprising: determining ΔK experimentally determining K determining ΔK predicting crack growth rate da/dN according to wherein p is a driving force constant, γ a fatigue growth equation exponent, and p and γ are empirically determined from fitting a Coffin-Manson curve to strain-controlled fatigue test data of the component, C is a fatigue crack growth constant computed from the Coffin-Manson curve and the strain-controlled fatigue test data, ΔK appl is applied stress intensity range, K max,appl is a maximum applied stress intensity factor, K int and ΔK int are internal stress intensity factors due to internal stresses, and K max,total is a total maximum stress intensity factor calculated as a sum of K int and K max, appl .