SYMPOSIA PAPER Published: 01 January 1993
STP24264S

Experimental Relationship Between Equivalent Plastic Strain and Constraint for Crack Initiation

Source

The applicability of fracture mechanics data generated from standard fracture toughness specimens in predicting structural integrity is often a concern. For elastic-plastic conditions, a second parameter identified as “constraint” (hydrostatic stress divided by the equivalent stress) is being used to link different specimen/flaw configurations, thus providing a mechanism for using data generated from standard fracture toughness specimens to predict structural integrity. Much of the literature is concerned with the difference in constraint between specimens and a structure, while little effort is being given to investigating the sensitivity of the crack initiation process to constraint for a given material. This paper presents experimental results relating crack initiation processes to constraint for a ferritic steel and an aluminum-based alloy.

Author Information

Reuter, WG
Idaho National Engineering Laboratory, Idaho Falls, ID
Lloyd, WR
Idaho National Engineering Laboratory, Idaho Falls, ID
Williamson, RL
Idaho National Engineering Laboratory, Idaho Falls, ID
Smith, JA
Texas A&M University, College Station, TX
Epstein, JS
Idaho National Engineering Laboratory, Idaho Falls, ID
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Details
Developed by Committee: E08
Pages: 55–79
DOI: 10.1520/STP24264S
ISBN-EB: 978-0-8031-5241-0
ISBN-13: 978-0-8031-1867-6