On Crack Propagation Along Crystallographic Slip Bands.
Abstract
The influence of the crystallography of slip (fcc, hcp, and bcc) on crack propagation along planar slip bands is examined for two different inclined-crack configurations. If a crack propagates along a slip band and the Burger's vector of slip within that band is contained in the plane of the crack, (i.e., coplanar slip), then non-coplanar slip is hindered and large normal stresses develop near the crack-tip even for inclined cracks. The magnitude of these normal stresses is largest for basal plane cracking in a hcp material. However, the calculations show that the magnitude of the plastic constraint factor even for an inclined crack in fcc and bcc alloys fracturing along crystallographic slip bands is also large and comparable to a mode I crack in a polycrystalline material. The combination of the intense shear caused by the planar slip and the large normal stresses should result in easy crack propagation across individual grains and could result in a susceptibility to hydrogen embrittlement. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1980
- Accession Number
- ADA087128
Entities
People
- Donald A. Koss
- K. S. Chan
Organizations
- Michigan Technological University