Effect of Gas Bubbles on the Plastic Zone around a Crack Tip.
PRINCETON UNIV NJ
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During the loading of a crack edge dislocations are emitted from the crack tip forming a plastic zone. The presence of gas bubbles near the crack tip can change the plastic zone size and location drastically. A detailed study of the force field on an edge dislocation due to the crack load and gas bubbles allows for the determination of the plastic zone as a function of the inclination angle. The dislocation distribution along the plastic zone is found from force equilibrium considerations. Due to the presence of gas bubbles a shrinking and repulsion of the plastic zone from the crack tip is noticed. This process indicates the material embrittlement. The dislocation free zone DFZ near the crack tip grows. This embrittlement can become crucial in material design for fusion applications. Keywords CrackingFracturing Strengthmechanics Stress analysis Stress strain relations Stress testing Tensile stress Fusion reactors Nuclear reactors.
- Fusion Devices (Thermonuclear)