The Effects of the Surface Layer on Plastic Deformation and Crack Propagation
Abstract
The report describes the effect of a surface layer on the rate of crack propagation and, based on this knowledge, the author proposes to improve the crack propagation resistance of metals used in pressure vessels. The qualification of pressure vessel hardware is usually achieved by the proof test method. The maximum size of the flaw that is present can be predicted from fracture mechanics. However, cracks can grow below the critical stress intensity K(c) and can cause leak failure. Therefore, the subcritical crack growth characteristics of metals are important in pressure vessel material selection. An evaluation of the crack growth rate under sustained or cyclic loading under the service stress gives a measure of reliability of the hardware.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1971
- Accession Number
- AD0721292
Entities
People
- Irvin R. Kramer
Organizations
- Martin Marietta