Fracture toughness tests of structural weldments
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Insuring structural integrity demands an ever-increasing understanding of material behavior. While engineers have long agreed on methods for measuring the strength or elasticity of a material, such a consensus has yet to be reached on the determination of fracture toughness. Fracture toughness measures material resistance to the presence of a crack or other flaw. Low fracture toughness indicates brittle behavior if a flaw is present. One way to quantify fracture toughness uses crack-tip opening displacement (CTOD). The American Society for Testing and Materials has recently proposed an annex to ASTM E1290-93 revising the current CTOD standard specifically for weld use. This paper focuses on the application of the ASTM annex to steel bend specimens and an analysis of its efficacy in terms of reproducibility, temperature variation, similarity to E1290, and procedural success. The annex demonstrates reliability in its calculation of critical CTOD values. It also appears theoretically sound. Including this addendum in the E1290 standard is endorsed.
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Includes bibliographical references (leaves 26-31).
Weir, Breanna M (1999). Fracture toughness tests of structural weldments. Texas A&M University. Available electronically from