The effects of hydrostatic pressure on the mechanism of tensile fracture of aluminum

Published on Jun 1, 1975in Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science2.556
· DOI :10.1007/BF02658524
I.E. French7
Estimated H-index: 7
P. F. Weinrich1
Estimated H-index: 1
The effects of hydrostatic pressures up to 600 MPa on the tensile fracture mechanisms of commercial aluminum and a free machining aluminum-copper alloy have been investigated. Tensile fracture of the commercial aluminum was found to occur by a mechanism leading to double-cup fracture at hydrostatic pressures up to 125 MPa with the pressure causing a progressive delay in the onset of void development. Above this pressure, void development was suppressed and all fractures occurred at chisel points. The chisel point fracture was found to involve the development of two opposing diagonal shear zones crossing through the neck center. Fracture of the aluminum alloy occurred by a cup-cone mechanism at pressures up to 300 MPa. Within this pressure range the natural strain to fracture increased linearly and the amount of void coalescence decreased. At higher pressures fracture of the aluminum alloy occurred entirely by a shear mechanism involving the development of void-sheets.
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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...
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.
#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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#2P.F WeinrichH-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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A law governing the change in the ductility of metals and alloys under pressure is given: $$\begin{gathered} \left( {\frac{P}{{\sigma _n }}} \right) = \tfrac{1}{2}\frac{1}{{\sigma _n }}\frac{{d\sigma }}{{d\varepsilon }}\{ \varepsilon _{local} (P)^{\tfrac{3}{2}} - \varepsilon _{local} (O)^{\tfrac{3}{2}} \} + \tfrac{1}{3}\frac{1}{{\sigma _n }}\frac{{d\sigma }}{{d\varepsilon }}\{ \varepsilon _{local} (P) - \varepsilon _{local} (O)\} + \hfill \\ {\text{ }} + \tfrac{1}{2}\{ \varepsilon _{local} (P)^{...
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