Analysis of Nonproportional Multiaxial Fatigue Test Data of Various Aluminum Alloys Using a New Damage Parameter

摘要

This paper presents a detailed investigation into nonproportional loading-induced multi-axial fatigue damage in a series of aluminum alloys using a recently developed moment of load path (MLP) model that contains a material sensitivity parameter. A generalized procedure is presented for determining material sensitivity to nonproportional load path and is demonstrated for characterizing multi-axial fatigue damage in these aluminum alloys under nonproportional loading conditions. Major findings are: (a) All of the alloys studied in this paper show a lesser degree of sensitivity to nonproportional loading when comparing structural steels recently reported by the same authors with material sensitivity parameter (