Nonproportional low cycle fatigue of 6061aluminum alloy under 14 strain paths

摘要

This paper studies the nonproportional low cycle fatigue of 6061 aluminum alloy under 14 strain paths.Tension-torsion low cycle fatigue tests were carried out using hollow cylinder tube specimens (OD 12 mm,ID 9 mm,gage length 6.4 mm) under 14 proportional and nonproportional cyclic strain paths at room temperature.nonproportional strain written with only strain path and having a material constant correlated nonproportional fatigue lives within a factor of two scatter band.The additional hardening of 6061 aluminum alloy under nonporportional straining was also discussed in relation with fatigue life.