Abstract
Failure prediction of cross-rolled beryllium SR-200 sheets loaded in a complex state of stress was demonstrated by means of the Tsai-Wu failure theory. A total of sixteen beryllium plates, 2.54 mm thick with various length-to-width ratios and support conditions, were tested in the laboratory with a central transverse point load. Finite-element analyses of the plates were coupled with the failure prediction theory. Prediction of failure from numerical simulation was compared with strain gage and displacement transducer measurements. Analysis of the load history of the specimens revealed a primary and an ultimate failure load. Ultimate failure of a fully clamped plate caused an unusual delamination phenomenon, whereby a circular region displaced in the direction of the load, but did not separate from the plate.
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