The calculations carried out in Part I of the paper are extended to take account of cases in which the Griffith cracks are subjected to surface tractions due to (i) fluid pressure, or (ii) closure of the cracks under all-round compression. The results are again in broad agreement with results obtained in the two-dimensional treatment of the problem; and with experimental observations. The Mohr envelope in case (ii) is a linear one, with a gradient—μf where μf is the coefficient of Coulomb (sliding) friction. In all cases fracture initiation is shown to be independent of the intermediate principal stress.
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Murrell et al. (1970) studied this question.
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