Abstract
The Voronoi tessellation technique was used to model an idealized polycrystalline microstructure. This novel meshing approach was also implemented to study the crack initiation and growth behaviors of Sanicro25 alloy through small punch creep tests using a modified creep damage constitutive model. Furthermore, the influence of specimen thickness on crack fracture mechanics was examined. The suitability of this novel method was validated on the basis of the accuracy of simulation results. Transgranular fracture patterns were found at the primary stage, which were transformed into intergranular cracks as the creep time progressed. Cracks in small punch specimens were predominantly initiated on the outer surface, where high stress triaxiality occurred. Simultaneously, the high stress and stress triaxiality deviation controlled crack growth behaviors were determined by considering the various stress states.
Published Version
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