Experimental results are sumarised on different metallic materials in order to point out the influence of the following parameters on the fatigue limit: size, type, morphology, position and loading (see Figure 1).
Figure 1: Modelling the influence of defect size, type, position, morphology and loading
on the fatigue limit using DSG (Defect Stress Gradient) criterion
A modelling strategy is proposed to evaluate the influence of defect on the fatigue limit by
(i) computing the Equivalent Inertia Ellipse of each defect
(ii) modelling the influence of the defect on the fatigue limit through the DSG (Defect Stress Gradient) approach
(iii) 3D mapping the criticality of each individual defect.
The Methodology is validated through fatigue tests conducted on Cast materials as well as AM materials.