Effects of Prestraining Under Hydrostatic Pressure on the Mechanical Behavior of Polycrystalline Beryllium PDF Download
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Author: N. Inoue Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
The effects of hydrostatic pressure up to 400 ksi and at 25 C to 300 C on the mechanical properties of three forms of beryllium (hot-pressed block, extruded rod and cross-rolled sheet) were investigated. Three effects of pressure were studied: mechanical behavior under pressure, the effect of pressure cycling on the subsequent atmospheric pressure mechanical properties and the effects of prestraining under hydrostatic pressure on the subsequent atmospheric pressure mechanical properties. Pressure cycling did not produce a significant improvement in the tensile ductility of the hot-pressed and the extruded materials; it did, however, given an improvement in the tensile and bend ductility of the sheet. With the possible exception of an improvement in the bend ductility of sheet, tensile prestraining under hydrostatic pressure either produced no change in the subsequent atmospheric pressure ductility or there resulted a decrease. The prestraining did, however, give an increase in yield and fracture stresses. The results obtained in the present investigation suggest that the principal effect of pressure is on the fracture stress rather than on the flow stress. (Author).
Author: N. Inoue Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
The effects of hydrostatic pressure up to 400 ksi and at 25 C to 300 C on the mechanical properties of three forms of beryllium (hot-pressed block, extruded rod and cross-rolled sheet) were investigated. Three effects of pressure were studied: mechanical behavior under pressure, the effect of pressure cycling on the subsequent atmospheric pressure mechanical properties and the effects of prestraining under hydrostatic pressure on the subsequent atmospheric pressure mechanical properties. Pressure cycling did not produce a significant improvement in the tensile ductility of the hot-pressed and the extruded materials; it did, however, given an improvement in the tensile and bend ductility of the sheet. With the possible exception of an improvement in the bend ductility of sheet, tensile prestraining under hydrostatic pressure either produced no change in the subsequent atmospheric pressure ductility or there resulted a decrease. The prestraining did, however, give an increase in yield and fracture stresses. The results obtained in the present investigation suggest that the principal effect of pressure is on the fracture stress rather than on the flow stress. (Author).
Author: H. Conrad Publisher: ISBN: Category : Languages : en Pages : 50
Book Description
Data available in the literature on the mechanical behavior of beryllium were evaluated to ascertain the operative dislocation mechanisms. These suggest that the deformation dynamics of polycrystalline beryllium in the range of 78 K to 800 K is related to the motion of dislocation on the first order prism planes. Above 800 K, the yield stress exhibits a stronger temperature dependence than that for prism slip and the deformation dynamics may be associated with either the operation of C + a pyramidal slip or perhaps some diffusion-controlled mechanism. Insufficient data are presently available to positively identify the rate controlling dislocation mechanisms. The effect of hydrostatic pressure on the ductile-to-brittle transition temperature is in accord with the concept that the transition is associated with the operation of c + a pyramidal slip. As a first step in the study of the anisotropy of bonding in beryllium the elastic shear constant C = C(11) + C(12) + 2 C(33) - 4 C(13) has been calculated for beryllium using Jones' model and was found to be in good accord with the experimental value. Using this model, the effect of the addition of monovalent and polyvalent alloying elements on the elastic constant was calculated and found to be significant. (Author).
Author: American Institute of Mining, Metallurgical, and Petroleum Engineers Publisher: ISBN: Category : Mineral industries Languages : en Pages : 1400
Author: N. Inoue
Author: N. Inoue
Author: Erdem Aladag
Author: H. Conrad
Author: Defense Documentation Center (U.S.)
Author: Air Force Materials Laboratory (U.S.)
Author: S. V. Radcliffe
Author: 
Author: American Institute of Mining, Metallurgical, and Petroleum Engineers
Author: 
Author: