SEDL / STP / STP651-EB / STP26544S

Analysis of Local Stresses and Strains in Ti-6A1-4V Widmanstätten α + β Microstructures

Smelser, RE
Graduate student and professor, respectively, Department of Mechanical Engineering, and associate professor, Department of Metallurgy and Materials Science, Carnegie-Mellon University, Pittsburgh, Pa.

Swedlow, JL
Graduate student and professor, respectively, Department of Mechanical Engineering, and associate professor, Department of Metallurgy and Materials Science, Carnegie-Mellon University, Pittsburgh, Pa.

Williams, JC
Graduate student and professor, respectively, Department of Mechanical Engineering, and associate professor, Department of Metallurgy and Materials Science, Carnegie-Mellon University, Pittsburgh, Pa.

Pages: 16    Published: Jan 1978

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Abstract

The application of continuum mechanics to the analysis of fracture in structural materials has been helpful in understanding macroscopic behavior in these materials. However, in many classes of structural material, among these titanium alloys, microstructure has been shown to have an effect on fracture even under circumstances of constant yield stress. In such instances, macroscopic continuum mechanics are of limited value since no microstructural scale variations in stress and strain are considered. In the present study we have used finite element analysis to calculate variations in local stress and strain distributions on a scale comparable to that of the microstructural features. This paper describes the methods used to make these calculations, illustrates some of the results for one microstructure, and suggests how these results influence our understanding of fracture in two phase microstructures such as those observed in α ∔ β alloys.