Abstract
This paper described the design method for visualizing loading history under multiaxial loading states. Multiaxial fatigue lives are affected by stress and strain multiaxiality, and non-proportionality. It is well known that the non-proportional loading cause significant life reduction. Many fatigue studies have reported material data under non-proportional loading and proportional one, and they have dealt with life estimation models. However, a few studies discussed the application the theory to an actual design for structural components. This paper proposes a simple method based on principal stress arid strain to describe variable loading history, non-proportionality and fatigue life under multiaxil loading.
