Abstract
The influence of the 10% uniaxial and equi-biaxial tensile pre-strain on the notch fatigue performance of DP590 steel is investigated in the present study. Comparison has been made between smooth and notched specimens to recognize the effect of pre-strain on notch fatigue performance. The material’s fatigue strength improves from 240 MPa to 270 MPa, 294 MPa for the smooth specimen and from 91 MPa to 97 MPa, 120 MPa for the notched specimen under the uniaxial and equi-biaxial tensile pre-strain conditions. 10% uniaxial and equi-biaxial tensile pre-strain has little influence on notch fatigue life. Finite element analysis highlights stress-concentration around notch tip rise and cyclic plastic deformation zone decrease with pre-straining. An increase in stress-concentration in the notched specimen nullifies improvement of tensile yield stress and fatigue strength due to pre-strain; thereby a small enhancement of notch fatigue life is noticed after pre-straining.
Published Version
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