Failure Prediction for Cross-Rolled Beryllium Sheet Material

[+] Author and Article Information
P. Roschke

Department of Civil Engineering, Texas A&M Univ., College Station, TX

E. Mascorro

Mustang Engineers, Houston, TX

J. Eng. Mater. Technol 118(2), 207-212 (Apr 01, 1996) (6 pages) doi:10.1115/1.2804888 History: Received July 09, 1994; Revised June 18, 1995; Online November 27, 2007


A failure model for cross-rolled beryllium SR-200 sheets is developed for material loaded in a complex state of stress. Coefficients of the Tsai-Wu criterion are determined from a series of special laboratory experiments. Tests include circular plates loaded by a concentric ring, as well as in-plane compression and off-axis plate specimens. Complex states of stress lead to brittle failure of the anisotropic material. Failure surfaces obtained from the criterion form a family of ellipses when plotted in standard Cartesian coordinates. The criterion is incorporated into a general purpose finite element analysis code. Numerical simulation incrementally applies loads to a structural component that is being designed and checks each nodal point in the model for exceedance of the failure criterion. To demonstrate applicability of the predictive capability of the criterion, a 2.54-mm thick beryllium plate is placed under clamped edge conditions and loaded to failure by a central transverse point load. A numerical model of the structure predicts the failure load to within three percent.

Copyright © 1996 by The American Society of Mechanical Engineers
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