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The purpose of this, the second symposium, sponsored by Subcommittee II on Fractography of ASTM Committee E-24 on Fracture Testing of Metals is to present the results of recent applications of microfractography. As the papers in this volume indicate, fractographic investigation has contributed both to the phenomenological study of the fracture mechanisms of cleavage, microvoid coalescence, stress corrosion, and fatigue, as well as providing quantitative measurement of microfractographic features associated with fracture processes. The successful attempts shown here to correlate measurement of fatigue and fracture features with the macroscopic parameters of current engineering analyses illustrate the value of application of these techniques. These results contribute directly to an understanding of the relationship between material phenomenological behavior and mechanical properties of fracture toughness, fatigue crack growth rate, and ductility of engineering alloys and polymers. It is believed that this, and future work of this nature, in time, will add both to the development of fractographic techniques as well as provide a useful link between fractographic features and mechanical properties of interest to material users.
Brothers, A. J.
Applied research metallurgistsymposium chairman, General Electric Co., Schenectady, N. Y.