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Dislocation Density-Based Finite Element Method Modeling Of Ultrasonic Consolidation, Deepankar Pal
Dislocation Density-Based Finite Element Method Modeling Of Ultrasonic Consolidation, Deepankar Pal
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A dislocation density-based constitutive model has been developed and implemented into a crystal plasticity quasi-static finite element framework. This approach captures the statistical evolution of dislocation structures and grain fragmentation at the bonding interface when sufficient boundary conditions pertaining to the Ultrasonic Consolidation (UC) process are prescribed.
The hardening is incorporated using statistically stored and geometrically necessary dislocation densities (SSDs and GNDs), which are dislocation analogs of isotropic and kinematic hardening, respectively. Since the macroscopic global boundary conditions during UC involves cyclic sinosuidal simple shear loading along with constant normal pressure, the cross slip mechanism has been included in the …