Shear strain localization and fracture evolution in rock. Progress report, April 15, 1993--February 15, 1994 [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1994. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 20 pages : digital, PDF file
- Additional Creators:
- United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
- Work during this Period has concentrated on refinements of a constitutive relation based on damage due to oriented microcracks. The goal of this portion of the study is to determine whether this relation satisfactorily describes axisymmetric and multi-axial (compression-torsion) test data on Tennessee marble. We have studied the predictions of the relation for the crack lengths and orientations in axisymmetric compression, for peak stress and for the damage surface for combined torsion and compression. A key result is that the damage surface for combined torsion and compression is initially elliptical but forms a vertex with axial loading beyond the initial damage stress. The vertex angle continues to narrow with further axial loading and depends additionally on the coefficient of friction and the range of angles of cracks that have been activated. A consequence of vertex formation is that the stiffness of response to an increment of shear imposed on axial compression, as occurs in localization, will be much less than the elastic modulus and will continue to diminish with further axial deformation.
- Published through SciTech Connect., 03/01/1994., "doe/er/14344--1", "DE94008583", "KC0403010", Rudnicki, J.W., and Northwestern Univ., Evanston, IL (United States)
- Type of Report and Period Covered Note:
- Annual; 01/01/1993 - 12/31/1994
- Funding Information:
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