Topic
Hydrostatic stress
About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.
Papers published on a yearly basis
Papers
More filters
3 citations
TL;DR: In this article, the authors used plane elasticity theory to obtain expressions for the stress and displacement fields at the tip of a craze containing a crack, which is modeled as a very thin elliptical inclusion with different elastic properties from the hat of the surrounding bulk polymer and solved by superimposing the solution of a crack problem onto the solution for a uniformly loaded homogeneous craze.
Abstract: Plane elasticity theory is utilized to obtain expressions for the stress and displacement fields at the tip of a craze containing a crack. The craze is modeled as a very thin elliptical inclusion with different elastic properties from hat of the surrounding bulk polymer. Problem is solved by superimposing the solution of a crack problem onto the solution for a uniformly loaded homogeneous craze. Invoking stress free boundary conditions on the crack surface provides a singular integral equation of Hilbert type with a unique solution. Contour lines of constant hydrostatic stress and constant maximum shear stress around the craze tip are shown graphically. These two stress combinations have played prominent roles in a number of proposed craze growth criteria. Results show that even for relatively long cracks within the craze, very little stress enhancement at the craze tip occurs. Only as the crack tip approaches the craze tip does the enhancement become significant, tending to drive the craze region ahead of the crack.
3 citations
01 Jan 2002
TL;DR: In this article, Zhang et al. studied the influence of cutting conditions on void nucleation, growth and coalescence in the machining process and found that void coalescence always occurs in the newly machined surface below the flank face of the tool and in the chip flowing around the chip-groove region near the upper end of the face land.
Abstract: The objective of this paper is to study void evolution and its effects on material failure during the machining process. The influence of cutting conditions on void nucleation, growth and coalescence is studied. The ultimate goal of this approach, as applied to machining, is to predict chip breakage and surface conditions via damage mechanics. A damage mechanics model proposed by Komori [1] is chosen to study the evolution of the void volume fraction in the chip and workpiece being machined with a grooved tool. A Thomason [2] type criterion as modified by Dhar et al. [3], that uses the variables calculated by FEM analysis, is used to predict void coalescence (failure). The distribution of the variables, such as effective strain-rate, nondimensional hydrostatic stress, and effective strain are obtained using the FEM methodology described by Zhang [4]. It is found that void coalescence always occurs in the newly machined surface below the flank face of the tool and in the chip flowing around the chip-groove region near the upper end of the face land. On the other hand, whether void coalescence occurs inside the chip or not, depends on the complex interactions between the machining parameters and chip geometry.© 2002 ASME
3 citations
TL;DR: In this paper, the authors introduced the concept of the hydrostatic constraint factor, defined as the ratio of hardness to yield stress on porous sintered steels, to the universal indentation diagram of porous ceramics.
Abstract: Discrepancies have been noted between the predictions of classical mechanics for dense bodies and the Vickers indentation cracking behaviour of porous YBa2Cu3O7- x ceramics, and in particular a shift in the ‘universal’ indentation diagram of Niihara et al. The hydrostatic constraint factor is measured as the ratio of hardness to yield stress on porous sintered steels. Its introduction into the universal indentation diagram of porous ceramics allows retrieval of the behaviour predicted for dense materials. The question of whether the evolution of the constraint factor with porosity could be common to all porous materials densifying under constrained compression is addressed.
3 citations
TL;DR: In this article, the induced birefringence of vitreous silica for λ 5893 A was measured at uniaxial stress to about 7 kbar with a Babinet compensator.
Abstract: The induced birefringence of vitreous silica for λ 5893 A was measured at uniaxial stress to about 7 kbar with a Babinet compensator. Nonlinear elasticity was used to account for specimen dimension changes. The variation of birefringence with stress is linear within the limits of experimental error, whereas its relation to Lagrangean strain is nonlinear. This is in contrast to the nonlinear piezo‐optic but linear strain‐optic behavior observed in vitreous silica under hydrostatic stress. The difference p‐ q of the Neumann strain‐optic constants and its stress and strain derivatives is also presented.
3 citations