Concepedia

TLDR

The failure mode depends on material, strain range, and hydrostatic stress state. The study proposes two multiaxial fatigue damage models: a shear‑strain model for mode II crack growth and a tensile‑strain model for mode I crack growth. The models were validated on Inconel 718, SAE 1045, and AISI 304 stainless‑steel tubular specimens in strain control, with both proportional and non‑proportional loading histories considered. The additional cyclic hardening accompanying out‑of‑phase loading must be included in the fatigue damage model.

Abstract

Two multiaxial fatigue damage models are proposed: a shear strain model for failures that are primarily mode II crack growth and a tensile strain model for failures that are primarily mode I crack growth. The failure mode is shown to be dependent on material, strain range and hydrostatic stress state. Tests to support these models were conducted with Inconel 718, SAE 1045, and AISI Type 304 stainless steel tubular specimens in strain control. Both proportional and non-proportional loading histories were considered. It is shown that the additional cyclic hardening that accompanies out of phase loading cannot be neglected in the fatigue damage model.