Results 141 to 150 of about 4,633 (186)

Analysis of Shear Banding in True Triaxial Tests on Sand

Journal of Engineering Mechanics, 2001
A series of true triaxial tests have been performed on rectangular prismatic specimens of Santa Monica Beach sand at three different relative densities to study the occurrence of failure, mechanism...
Lade, Poul V., Wang, Q.
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Endochronic Modeling of Sand in True Triaxial Test

Journal of Engineering Mechanics, 1985
The endochronic constitutive equation is written in differential form, which is then used to describe the deviatoric behavior of drained sand in true triaxial test. Explicit equations have been derived. The modified concept of intrinsic time is applied so that no built‐in discontinuities exist in the constitutive equation. Triaxial compression test (TC)
Han C. Wu, Zhan K. Wang, M. R. Aboutorabi   +2 more
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True-triaxial strength criteria for rock

International Journal of Rock Mechanics and Mining Sciences, 2009
Abstract This paper reviews some strength criteria which include the role of the intermediate principal stress, and proposes a new criterion. Strength criteria of the form σ oct = f N ( σ oct ), such as Drucker–Prager, represent a rotation surface in the principal stress space, symmetric to the line σ 1 = σ 2 = σ 3 in the meridian plane ...
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The true triaxial strength anisotropy of sand

Géotechnique
Sand exhibits transversely isotropic (TI) characteristics, with its strength properties influenced by the coupling effects of the intermediate principal stress ratio b and the orientation angle δ of the bedding plane (BP) relative to the major principal stress.
Dechun Lu, Jingyu Liang, Zhiwei Gao, Junhong Zhang, Xiuli Du   +4 more
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On the determination of true stress triaxiality in sheet metal

Journal of Materials Processing Technology, 2007
Abstract Material ductility, or the failure strain, is generally characterized by simple tensile tests. However, tensile tests on sheet samples lead to higher strain gradients than those observed in axisymmetric samples, so the classical Bridgeman correction is invalid.
A. Bacha, D. Daniel, H. Klocker
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Development of a True Triaxial Apparatus for Sands and Gravels

Geotechnical Testing Journal, 2008
Abstract This paper presents a recently developed true triaxial apparatus and a series of verification studies. The apparatus is capable of handling 241-mm cubical specimens providing the means for testing specimens under a wide variety of stress paths under drained and undrained conditions.
Changho Choi, Pedro Arduino, Michael D. Harney   +2 more
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True Triaxial Apparatuses with Two Rigid Boundaries

Site Characterization and Modeling, 2005
A small-scale and a large-scale true triaxial apparatuses (where σ1≠σ2≠σ3) were recently developed at the Institute of Industrial Science, University of Tokyo, Japan and are described in this paper. In these apparatuses, a comprehensive loading system that can control both strain rate and stress rate is used for the vertical (axial) direction.
L. Q. AnhDan, J. Koseki, K. Hayano, T. Sato   +3 more
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A rock test cell with true triaxial capability

Geotechnical & Geological Engineering, 1999
Conventional so-called triaxial test cells apply the axial stress to a cylindrical sample using steel platens, with the confining stress developed via an annulus of hydraulic fluid retained by a liner in a pressure cell. This does not allow differentiation between the two principal stresses around the core and inhibits the realism with which the rocks ...
B.D.G. Smart, J.M. Somerville, B.R. Crawford   +2 more
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DEM simulations of sandstone under true triaxial compressive tests

Acta Geotechnica, 2016
Numerically simulated true triaxial compression tests (σ 1 ≥ σ 2 ≥ σ 3) are conducted in this study to elucidate the failure mechanism of sandstone using 3D discrete element method (DEM), in particular the effect of the intermediate principal stress (σ 2 ...
K. Duan, C. Y. Kwok, X. Ma
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Development of a constitutive model for a bedded argillaceous rock from triaxial and true triaxial tests

Canadian Geotechnical Journal, 2015
In this work, a constitutive model that predicts the mechanical behaviour of Opalinus clay is developed. The model is based on the theory of plasticity, and takes into consideration the inherent anisotropy due to the existence of bedding planes, hardening behaviour before the peak strength, softening behaviour after the peak, and creep effects.
T.S. Nguyen, A.D. Le
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