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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
01 Nov 1971
TL;DR: In this paper, three systems of compressive stress were applied, uniaxial, equal biaaxial and hydrostatic, all principal stresses being less than 50 percent of the uniaXial strength, and it was found that Poisson's ratio for total strain remained sensibly constant throughout the test.
Abstract: Creep tests are reported in which sealed concrete specimens were loaded at the early age of 1 day and maintained under load for a further 61 days. Three systems of compressive stress were applied, uniaxial, equal biaxial and hydrostatic, all principal stresses being less than 50 percent of the uniaxial strength. It was found that Poisson's ratio for total strain (elastic+creep) remained sensibly constant throughout the test and was little affected by the system of loading. In general, the characteristics of creep and creep recovery under the multiaxial stress systems are the same as those observed in older concrete. A further test with stresses of 70–100 percent of the uniaxial strength resulted in increased unit strains, even under hydrostatic stress.

1 citations

Journal ArticleDOI
TL;DR: In this article, a constitutive equation for transient creep is proposed, which includes the effect of the hydrostatic pressure on the yield function of cellulose nitrate and cellulose acetate under various combinations of superimposed tensile and hydrostatic loadings.

1 citations

Journal ArticleDOI
TL;DR: In this article, simple equations of state of hereditary type are introduced and results of analyzing certain experiments are presented for determining the stresses and strains in the case where the average stress does not depend on the coordinates.
Abstract: Simple equations of state of hereditary type are introduced and the results of analyzing certain experiments are presented. A solution of the problem of determining the stresses and strains in the case where the average stress does not depend on the coordinates is given for the equations of state in question.

1 citations

Journal ArticleDOI
TL;DR: In this article, the authors compared the Gurson model and von Mises theory for deformation in a series of single elements including different types of loading, and used the MARC finite elements software to calculate stress, strains and the void volume fraction.
Abstract: Ductile fracture in metals can involve the generation of considerable porosity caused by nucleation, growth and coalescence of microvoids. This process takes place on micro-level and can not describe by traditional constitutive laws such as von Mises theory. Hence, A. L. Gurson developed a theory which takes account of void growth and showed the role of hydrostatic stress in plastic yield and void growth. In this model the void volume fraction f (the portion of void in the material) is the single damage parameter; its evolution is defined by the incompressibility of the matrix material. (For Lameitre's model the damage variable D is relevant.) To model the material damage by using the Gurson damage approach a series of single elements including different types of loading are used. In the single element cases the results of the Gurson model and von Mises are also compared. In calculations the MARC finite elements software is used to calculate stress, strains and f the void volume fraction.

1 citations

Journal ArticleDOI
TL;DR: In this paper, a phenomenological ductile fracture model is proposed by a careful consideration of void nucleation, growth and coalescence during plastic deformation, which can cover a wide range of stress states from simple shear to balanced biaxial tension.
Abstract: A phenomenological ductile fracture model is proposed by a careful consideration of void nucleation, growth and coalescence during plastic deformation. Within the model framework, void nucleation is controlled by an equivalent plastic strain function. Void growth takes place through two ways, namely void dilation and void elongation, which are characterized by the normalized hydrostatic stress and normalized maximum shear stress, respectively. Void coalescence is characterized by the maximum shear stress. Aluminum alloy (AA) 6016-T6 sheets are selected to conduct ductile fracture (DF) experiments on specimens with different geometries, which can cover a wide range of stress states from simple shear to balanced biaxial tension. Subsequently, the new DF model is calibrated by using a robust hybrid numerical-experimental approach with a three-dimensional (3D) fracture surface constructed for AA 6016-T6. Ductile fracture data of other two aluminum alloys (AA 2024-T351 and AA 5083-O) are also used to evaluate DF model performance by establishing their 3D fracture surfaces. Finally, a cup drawing test is conducted and simulated as a case study showing how an applicable way of using the new model. Furthermore, the predictive accuracy of the proposed DF model for fracture initiation is compared with other three uncoupled models (modified Mohr–Coulomb criterion (MMC), Lou-Yoon-Huh model and Mu-Zang model) by ABAQUS/Explicit with a user subroutine (VUMAT), which shows a good performance of the proposed DF model.

1 citations


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