Open AccessThe Theory of Brittle Fracture Initiation under Triaxial Stress Conditions—II
Author(s) -
Murrell S. A. F.,
Digby P. J.
Publication year - 1970
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1970.tb00155.x
Subject(s) - envelope (radar) , fracture (geology) , compression (physics) , stress (linguistics) , principal stress , brittleness , geology , brittle fracture , mechanics , materials science , geotechnical engineering , physics , composite material , shear stress , linguistics , philosophy , telecommunications , radar , computer science
Summary 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—μ f where μ f is the coefficient of Coulomb (sliding) friction. In all cases fracture initiation is shown to be independent of the intermediate principal stress.