DYNAMIC TEAR TEST DEFINITION OF THE TEMPERATURE TRANSITION FROM LINEAR ELASTIC TO GROSS STRAIN FRACTURE CONDITIONS,
Abstract
Transition temperature concepts for fracture-safe design have been based on the relatively narrow temperature range evidenced by the fracture-mode transition from plane strain to plane stress. Fracture mechanics theory has suggested that large increases of section size should provide sufficient mechanical constraint for retention of plane strain conditions through the transition temperature range. Recent investigations based on dynamic tear (DT) tests of thick-section reactor-grade steels (A-533 B) have provided clear evidence that the plane strain to plane stress transition is not eliminated. The DT test, as conducted using a small specimen, defines the temperature range of transition from linear elastic to gross strain mechanical conditions of fracture and, therefore, the required analytical treatment for flaw size-stress calculations. Fracture mechanics concepts are brought into consonance with transition temperature concepts of long standing, and the importance of considering fracture initiation in terms of limiting dynamic toughness values is emphasized. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 29, 1968
- Accession Number
- AD0680600
Entities
People
- F. J. Ross
- W. S. Pellini
Organizations
- United States Naval Research Laboratory