Influence of pre‐strain and bake hardening on the static and fatigue strength of a DP600 steel sheet

The influence of pre-strain on the tensile and fatigue properties a dual phase DP600 steel was studied. material pre-strained by uni-axial tension in rolling transverse direction. Thereafter, specimens were cut from deformed plates parallel or orthogonal to It found that increases yield strength. Results suggested strain path change primarily affects elastic-plastic transition during early stage reloading. Pre-strained showed an increase high cycle regimes as consequence strength increment, irrespective imposed pre-straining A modified stress life equation accounts for proposed good agreement with experimental data. Bake hardening enhanced both resistance. Walker successfully fitted account mean stress. In low fatigue, negligible observed due cyclic softening residual relaxation.