Date

1973

Document Type

Thesis

Degree

Master of Science

Department

Applied Mechanics

First Adviser

George C. Sih

Abstract

The existing theories in fracture mechanics have been reassessed and an attempt has been made to correct some of the inadequacies of these theories by the use of the strain-energy density theory. It has been hypothesized that critical value of S is a material parameter which mayy be used to determine the critical stress for a given problem. Results have shown that agreement between experiment and theory is good only for crack angles of about 45 degrees or more. In addition to investigating critical stresses, note has been made of the vector property of S which enables the direction of crack propagation to be determined.

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