Abstract
The effect of the strain rate, stress triaxiality and temperature on the fracture properties of Ti6Al4V is studied. First, static and dynamic in-plane tensile, shear and plain-strain tests are carried out. Classical measurements are combined with full field strain measurement by means of digital image correlation to assess the local strain during deformation. In addition, finite element simulations are used to gain more insight into the specimen behavior. Second, the fracture surface and the surrounding material are studied with electron microscopy. Thereby, void density and distribution are measured. It is found that the void density decreases very fast with increasing distance from the fracture while a more gradual decrease of the average void size is observed. Besides on the amount of strain, the void density depends on the stress triaxiality. Furthermore, the stress triaxiality during plastic deformation of the specimen is important. In contrast, the effect of the strain rate on the fracture properties is rather limited. Except for high strain rate shear tests where the formation of an adiabatic shear band precedes ductile fracture.
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