Effect of Pressure and Strain Rate on the Shear Strength of Beryllium

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Abstract
The shear strength of beryllium was measured at strain rates of 3.5×10−5, 3.6×10−3, and 3.7×10−1 sec−1. Measurements were taken under nearly hydrostatic pressures of 21, 44, and 63×108 N/m2. The shear strength was found to increase with both pressure and strain rate. A sample dislocation model was used to find an activation energy of 0.19 eV for dislocation motion. The model also gives an activation volume of 2.4×10−30 m3 per unit length of moving dislocation. Data taken at a strain rate of 3.7×10−1 sec−1 to strains of approximately 40 indicate no ductile strain below a pressure of 6×108 N/m2 and an increase in ductile strain of 1.2 for each increase in pressure of 109 N/m2 above this value.

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