Experimental investigation of the damage characteristics of two cast aluminium alloys: Part Ⅱ - LCF/HCF and TMF/HCF loading with special focus on the short crack growth behavior

摘要

In this work, the influence of superimposed high cycle fatigue on the LCF/HCF and TMF/HCF lifetime is investigated for two cast aluminium alloys of the types AlSi7 and AlSi12. The replica technique is used to examine the short crack growth behavior under pure LCF and LCF/HCF loading. The observed short crack growth evolution explains the observed lifetime reduction with increasing HCF amplitudes.