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Hydrostatic stress

About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.


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Journal ArticleDOI
Abstract: The theory of thermomechanical behavior of a linear viscoelastic Cosserat continuum is developed by making use of the fundamental concepts of continuum mechanics and irreversible thermodynamics. It is shown that, under conditions of arbitrary temporal and spatial variation of the temperature field, the stress tensor, the couple stress tensor and entropy density are derivable from a potential which is the free energy density Ψ.

1 citations

Book ChapterDOI
01 Jan 1997
TL;DR: In this paper, an early suggestion by Schleicher (1926) for the plastic yield condition of porous materials reads {fy(1)|335-1} where τ = ((3/2)S··S)1/2 is the Mises effective stress, S = σ − pI is the stress deviator, σ is the Cauchy stress tensor, I = (1/3)I··σ is the hydrostatic stress and (YC,YT) are the uniaxial yield stresses in compression and in tension
Abstract: An early suggestion by Schleicher (1926) for the plastic yield condition of porous materials reads {fy(1)|335-1} where τ = ((3/2)S··S)1/2 is the Mises effective stress, S = σ − pI is the stress deviator, σ — the Cauchy stress tensor, I — the 2nd order unit tensor, p = (1/3)I··σ is the hydrostatic stress and (YC,YT) are the uniaxial yield stresses in compression and in tension, respectively.

1 citations

Proceedings ArticleDOI
09 Aug 2006
TL;DR: The results of an experimental investigation designed to determine the effect of damage created by hydrostatic tensile loading on the properties of half-hard OFHC copper are reported in this article.
Abstract: The results of an experimental investigation designed to determine the effect of damage created by hydrostatic tensile loading on the properties of copper are reported. Three metallurgical conditions of half‐hard OFHC copper were investigated; as worked; annealed 2hr at 400°C (∼40 micron grain diameter); and annealed 2hr at 800°C (∼80 micron grain diameter). Mechanical property characterization included uniaxial compression tests. High rate plasticity and damage was introduced by Taylor and rod‐on‐rod impact tests. The damage from the high rate experiments was characterized using optical and scanning electron microscopy. Quasi‐static compression specimens machined from recovered high rate samples were tested to determine the influence of damage on the mechanical response of the material. The compression test results will be discussed in relationship to the starting microstructure and the extent of damaged introduced into the material.

1 citations

Proceedings ArticleDOI
12 Aug 2003
TL;DR: In this article, the second order Eshelby tensor is introduced as the thermodynamic driving force for the phase transformation and a second order tensor as the associated thermodynamic flux.
Abstract: The description of the transformation kinetics during a martensitic phase transition in solids is usually performed by scalar variables for both the thermodynamic force and flux. In a local description at the phase boundary, the movement of the boundary during the martensitic transformation can be described in terms of the second order Eshelby Tensor (or asymmetric chemical potential tensor) and the local orientation of the phase boundary. Transferring this local consideration to a macroscopic description by applying appropriate homogenization techniques, the Eshelby Tensor is introduced as the macroscopic thermodynamic driving force for the phase transformation. Consequently, a second order tensor is introduced as the associated thermodynamic flux. This tensorial description collapses to the classical case for a hydrostatic stress state. A constitutive relation between these tensorial variables is postulated based upon the assumption of the maximization of the dissipation and the existence of a threshold value for the thermodynamic force. Considering shape memory alloys, the onset and progress of the transformation for various thermomechanical loading path is calculated. The influence of the direction and magnitude of the stress and the temperature on the transformation is investigated. Furthermore, restrictions on the choice of the parameters of the model are derived.

1 citations

Journal Article
TL;DR: In this paper, the plasticity, damage and fracture induced by micro-indentation are reviewed, and it is shown that deformation around the crack-tip deformation is anisotropic.
Abstract: Investigations of the plasticity,damage and fracture induced by micro-indentation are reviewed.The principal findings are:(a) Micro-indentation may induce a transition from crystalline to nano-crystalline and amorphous structure,and there is a critical stress for this kind of transition.The shear stress,rather than the hydrostatic stress is proposed to be attributed to this transition.(b) There is a critical current density for the crystalline nucleation,and it is no related to the irradiation-induced temperature rise.(c) The crack-tip produced dislocations by during indentation is not atomically sharp,leading to crystal lattice distortion,and even to a transition from a crystalline lattice to disordered structure.An amorphous band with a width of 1-2nm between crack-walls is formed,and the crack propagation is then along the amorphous band,rather than sequential rupture of the cohesive bonds.(d) Fast Fourier Transformation(FFT)-SAED and corresponding Inverse-Fast Fourier Transformation(IFFT) fringe images from different lattice planes in selected areas of the crack-tip show that deformation around the crack-tip deformation is anisotropic.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202246
202134
202047
201948
201839