Influence of surface porosity on fatigue life of additively manufactured ASTM A131 EH36 steel

The influence of surface porosity on the fatigue life additively manufactured (AMed) EH36 steel samples via selective laser melting (SLM) was studied in-depth by using a numerical method, which pores were simulative AM 3D pores. in both simplified semi-ellipsoid/spheroid and more realistic triangular shapes evaluated first place. Stress concentration factor Kt analyzed ABAQUS assessed FE-SAFE closely related to pore size, shape, position, orientation as well their interactions, confirmed effects crack initiation stage during testing. effectiveness adding finish smooth model subjected internal geometry terms values ranging from 1 5.5. Different algorithms attempted with stress-life method giving higher estimation than strain-life while becoming invalid when stress situation rather serious (around = 2.5). There no much difference between uniaxial multi-axial because tensile cyclic loading applied model. Theoretically calculated total (crack propagation) linear elastic fracture mechanics (LEFM) fell same order experimental results for all (within 2). AMed material parameters used prediction where microstructure element counted. could deteriorate mechanical properties materials lot, such strength, Young’s modulus lifetime, etc. statistical analysis showed scatter band SN curves at 8 respect different scanning speeds.