The influence of hydrostatic pressure on the fracture mechanisms of sheet tensile specimens of copper and brass

Published on Apr 1, 1976in Acta Metallurgica
· DOI :10.1016/0001-6160(76)90006-7
P.F. Weinrich1
Estimated H-index: 1
,
I.E. French7
Estimated H-index: 7
Sources
Abstract
Abstract The influence of superimposed hydrostatic pressures up to 600 MPa on the tensile fracture mechanism of sheet specimens of α-brass, α-β brass and copper has been studied. Particular attention was paid to the mechanisms leading to the initiation of fracture. At low pressures a common fracture mechanism occurred in all materials which involved the formation of a zone of intense shear deformation followed by fracture due to the development of void-sheets within this zone. At a higher pressure, the magnitude of which increased with the strength of the material, the fracture mechanism changed to one in which fracture occurred at a chisel-edge without any void-sheet formation. In most cases this high pressure fracture mechanism was the result of intense shear deformation in two complementary zones which led to the formation of a ‘V’-shaped trough along one face of the specimen. Fracture occurred when this trough extended through the specimen.
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An investigation has been made into the effects of hydrostatic pressures up to 600 MPa on the tensile deformation and fracture mechanisms of commercial copper. Fracture occurred by the normal tensile fracture mechanism involving void coalescence followed by shear tearing at pressures up to 300 MPa. At pressures in excess of 300 MPa fracture occurred entirely by a mechanism involving highly localized bands of intense shear deformation. This mechanism resulted in fracture at a chisel-point so that...
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Abstract : The present note describes some further work on the effect of pressure on the tensile fracture of a leaded alpha + beta brass used previously and an investigation into the fracture strain-pressure relationship of an alpha + beta brass. The purpose of these investigations was to establish whether the discontinuity found in the alpha-brass existed in these materials also.
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#1I.E. FrenchH-Index: 7
#2P.F Weinrich (Australian Department of Defence)H-Index: 2
Abstract A detailed study has been made of the effects of hydrostatic pressures in the range 0.1–600 MPa on the tensile fracture strain of an α-brass. Fracture strain has been found to increase linearly with pressure up to 350 MPa, to decrease between pressures of 350 and 375 MPa and to then increase to a constant value at pressures greater than 450 MPa. The abrupt change from linearity of the fracture strain-pressure relationship at a pressure of 350 MPa was found to coincide with the suppressi...
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#1I.E. FrenchH-Index: 7
#2P.F WeinrichH-Index: 2
Last. C.W. Weaver (Australian Department of Defence)H-Index: 2
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Abstract The effects of hydrostatic pressures in the range 0.1 to 600 MPa on the tensile fracture of a free machining brass have been studied. In agreement with the results of earlier workers, the natural strain to fracture was found to increase rapidly with pressure for pressures up to 300 MPa, but to increase less rapidly at the higher pressures. The rapid increase in ductility under confining pressures up to 300 MPa is shown to be due to the suppression of void development, by the pressure, u...
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