Accession Number : ADA181001

Title :   Effect of Gas Bubbles on the Plastic Zone around a Crack Tip.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV NJ

Personal Author(s) : Dhondt,Guido D ; Eringen,A C

PDF Url : ADA181001

Report Date : Apr 1987

Pagination or Media Count : 37

Abstract : 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: Cracking(Fracturing); Strength(mechanics); Stress analysis; Stress strain relations; Stress testing; Tensile stress; Fusion reactors; Nuclear reactors.

Descriptors :   *BUBBLES, *CRACKS, ANGLES, DISLOCATIONS, EDGES, EMBRITTLEMENT, EQUILIBRIUM(GENERAL), FORCE(MECHANICS), GASES, MATERIALS, NUCLEAR REACTORS, PLASTIC PROPERTIES, SIZES(DIMENSIONS), SLOPE, STRESS ANALYSIS, STRESS STRAIN RELATIONS, STRESS TESTING, TENSILE STRESS

Subject Categories : Fusion Devices(thermonuclear)

Distribution Statement : APPROVED FOR PUBLIC RELEASE