Investigation of fatigue fracture behavior based on optical interferometry

This study explores the physical mechanism of fatigue failure using electronic speckle pattern interferometry (ESPI) and a wave theory of deformation and fracture. ESPI visualizes the displacement field of solid objects under deformation. Our numerical analysis indicates the reduction in Poisson's ratio plays a role in the transition from fatigue deformation to fracture. The ESPI data support this proposition. In this presentation, we will discuss various findings in the above research that can lead to a new paradigm of the fatigue fracture mechanism.