Micromechanics f an Extrusion in High-Cycle Fatigue With Creep
Abstract
A most favorably oriented crystal located at a free surface of a f.c. c. polycrystal subject to creep under cyclic tension and compression of high- cycle fatigue is considered. An extrusion in this crystal is shown to be produced by a positive slip in one thin slice 'P' and a negative slip in a closely located slice 'Q'. An initial tensile strain in the thin slice 'R' sandwiched between P and Q causes a positive initial shear stress in P and a negative one in Q. It is shown that the extrusion growth causes a tensile strain in R, which can activate second slip system giving a creep stain with a tensor component. It has the same effect as the initial strain in causing this difference in shear stresses in P and Q and gives much additional extrusion growth. The extent of intrusion and extrusion is important in this study of crack initiation. Keywords: Single crystals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1988
- Accession Number
- ADA213509
Entities
People
- S. R. Lin
- T. H. Lin
- Xiaoqin Wu
Organizations
- University of California, Los Angeles