Previous studies showed that the modified maximum tangential stress (MMTS) criterion considering two stress terms (con- −1/2 1/2 taining r and r ) of the well-known Williams series expansion can better assess the mode I fracture toughness (K ) of Ic rocks than the traditional maximum tangential stress (MTS) criterion. However, this study indicates that in some cases, only using the two stress terms cannot fully describe the tangential stress at the critical distance for rock specimens, and the higher order, non-singular stress terms can also play important roles in the tangential stress. The MMTS fracture criterion might still induce non-negligible errors for assessing mode I rock fracture. Thus, we propose a further improved MTS (FIMTS) criterion. The FIMTS criterion emphasizes that the number of non-singular stress terms used in a MTS-based criterion should be carefully chosen according to the following principle: the tangential stress at the critical distance can be accurately described using the selected stress terms. Mode I fracture tests on two kinds of rocks are conducted using a newly proposed V-notched short rod bend (VNSRB) specimen. The specimen- or loading-configuration-dependence of K indicated by the Ic experimental data is theoretically assessed using the traditional MTS, the
Rock Mechanics and Rock Engineering – Springer Journals
Published: Jun 2, 2018
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