Assessment of short fatigue crack closure behavior in Ti-6Al-4V alloy using 3D imaged-based CPFEM simulation

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Titanium alloys are used in critical applications such as the landing gear of aircrafts which are subjected to severe loading and hence demand excellent fatigue properties. Therefore, the understanding of fatigue damage which accounts for up to 90% of failures in structures is critical. This study aims to characterize the 3D short fatigue crack opening and closing behavior and its influence on crack growth rate. Currently, simulation of crack closing and opening behavior based on the actual 3D crack shape is being conducted. From the simulation, know how crack closure is generated in relation to the microstructure. From this understanding, it is possible to design the microstructure of titanium to develop materials which are difficult to fracture, hence guaranteeing safety.