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This publication Progress in Flaw Growth and Fracture Toughness Testing contains the papers presented at the Sixth National Symposium on Fracture Mechanics at American Society for Testing and Materials Headquarters, in Philadelphia, on 28–30 August 1972. It was the first Fracture Mechanics Symposium conducted under the sponsorship of ASTM Committee E-24 on Fracture Testing of Metals, and so it was appropriate that one major thrust of the papers presented was the progress in testing reflected in the book's title. In essence, the volume provides the 1972 state-of-the-art in the analysis and measurement of fracture toughness and flaw growth resistance, and so it should prove useful to theoreticians and experimentalists in keeping abreast of developments in these fields. The coverage includes items on the theory, analysis, and understanding of fracture behavior, including comment by Trebules and others on the crack closure phenomenon. In the regime of new methods development, the attention to the J-integral should prove particularly interesting to expermentalists, as considerable progress has been made by Rice, Paris, Landes, Begley, and Merkle in simplifying and presenting in a meaningful manner this new approach, first described at the Fifth Symposium. The new papers on subcritical crack growth are also of considerable importance, as they add to our understanding of threshold behavior and of the usefulness of crack closure in interpreting stress ratio and overload effects. The use of the fracture mechanics approach to the evaluation of a number of relatively tough materials is given considerable attention in this volume; the real engineering problems in dealing in fracture mechanics terms with the kinds of materials of which most structures are made are faced. Specifically, the problems in interpretation of plane-strain fracture toughness test results for tough aluminum alloys and steels are described, and the useful relationships between such data to other fracture related indices are presented. While no final answers are prescribed, the experiences of individuals who have had to deal with the problem today are discussed in the papers by Sullivan, Wang, Nelson, Judy, and Hertzberg, and their respective coauthors. Similarly, the papers by Okamura, Bjeletich, Kiefner, and Derby provide some current thoughts on the application of fracture mechanics concepts to design problems.
Kaufman, J. G.
Alcoa Research Laboratories, New Kensington, Pa.