The Investigation of Stop Holes to Arrest Crack Growth in Metallic Materials with Peridynamics

Date

2024-1-18

Author

Altay, Uğur

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In this thesis, PD approaches are compared under static loads in terms of total analysis durations and crack paths. Then, their displacement results are validated with FEA. This thesis also examines the effect of the stop hole on dynamic cracks employing Dual Horizon Peridynamics (DHPD) which permits variable point spacings. First, DHPD code is validated with Kalthoff-Winkler test. Then, the crack paths in the stop hole configurations are simulated by DHPD. Furthermore, the toughening and retardation effect of the stop hole configurations on a brittle material are examined with DHPD. In this thesis, the fatigue analysis of functionally graded materials (FGMs) is also examined in both Mode-I and Mixed Mode with an enhanced PD tool that eliminates the surface and volume correction. Furthermore, the retardation effect of stop hole on fatigue lives of both isotropic and FG materials is also examined. This thesis also examines the cyclic and monotonic behavior of isotropic materials by considering the plasticity behavior. For introducing plasticity effect, a novel PD approach which applies plasticity correction to linear PD results is developed. For verifying the accuracy of this PD approach, the monotonic curve of Al6061 T6 is simulated and PD result is seen to be close to original material monotonic curve. Then, the fatigue behavior of isotropic material is examined in both Mode-I and Mixed Mode by adding the plasticity behavior. Besides, the retardation effect of stop hole on fatigue life is also examined by incorporating plasticity behavior.

Subject Keywords

Stop Hole, Peridynamic, Fatigue, Dynamic Crack, Fracture Mechanic

URI

https://hdl.handle.net/11511/108401

Collections

Graduate School of Natural and Applied Sciences, Thesis