INVESTIGATION OF DYNAMIC CRACK GROWTH IN BIMATERIAL INTERFACES USING PERIDYNAMIC THEORY

Date

2023-4-27

Author

Serdarlar, Sevda

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Peridynamic theory (PD) is a nonlocal version of continuum mechanics that employs integral terms instead of spatial derivatives in its governing equations. Therefore, PD is a robust numerical tool for crack growth simulations. This master’s thesis investigates dynamic crack propagation confined to propagete along the interface of Homalite – aluminum bimaterial specimen subjected to shear impact loading using bond-based PD. The failure at the interface is utilized with a critical stretch that corresponds to the material Mode II fracture toughness. The impact is introduced as a pulse velocity field boundary condition. Simulations are conducted for three different boundary conditions at various interface toughness and impact velocity conditions. The history of crack tip position and speed are calculated. Mach waves are observed in the velocity contours of the intersonic cracks. The history of opening and tangential displacements are plotted for interface region. The results are compared with the literature, and it can be stated that PD is able to capture crack propagation behavior along bimaterial interfaces in the sub-Rayleigh and intersonic regimes with respect to both constituent materials.

Subject Keywords

Peridynamic Theory, Crack Propagation, Interfacial Cracks, Intersonic Cracks, Bimaterials

URI

https://hdl.handle.net/11511/103693

Collections

Graduate School of Natural and Applied Sciences, Thesis