An energy-based damage model of geomaterials—II. Deductionof damage evolution laws

✍ Scribed by G. Swoboda; Q. Yang

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 599 KB
• Volume: 36
• Category: Article
• ISSN: 0020-7683
• DOI: 10.1016/s0020-7683(98)00164-4

✦ Synopsis

This paper deals with the establishment of anisotropic conjugate force!based damage evolution laws in the framework of Rice|s "0860# {normality structure|[ Attention is particularly focused on the second!order damage tensors based on the fabric tensor\ which represents preexisting Gri.th microcracks in solids during small deformation\ isothermal and time!dependent processes[ The principal results include the deduced damage surfaces\ potentials and kinetic equations for the basic internal variables\ damage vectors and damage tensor[ For the damage tensor it is shown that the deduced damage surfaces in a.nity space have a parallel relation with the Tresca and Mises yield conditions in stress space and that the damage characteristic tensor J can be determined uniquely by the current damage tensor without resorting to microscopic parameters or unknown empirical coe.cients[ Þ 0887 Elsevier Science Ltd[ All rights reserved[