The Ductility Number Nd Provides a Rigorous Measure for the Ductility of Materials Failure

[+] Author and Article Information
Richard M. Christensen

Professor Research Emeritus, Department of Aeronautics and Astronautics, Stanford University, Stanford CA 94305

1Corresponding author.

ASME doi:10.1115/1.4042291 History: Received December 11, 2018; Revised December 13, 2018


The recently developed theory for isotropic materials failure is briefly outlined. The many steps and stages of the verification process for the theory are fully documented so that it can be used with assurance in a wide variety of directions. Then the failure theory is used to develop a new measure or index for the degree of ductility of materials failure in any state of stress. This new failure property is named the ductility number, Nd. It is rigorously derived, intuitively compatible, and very easy to use. Applications and interpretations of Nd are given.

Copyright (c) 2018 by ASME
Topics: Ductility , Failure , Stress
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