Crack Propagation and Fracture of Rock Specimen Loaded in Compression.
Proc Internat Conf on Dynamic Crack Propagation Lehigh Univ Bethlehem Pennsylvania, 7/10-12/72 :17 pages
The stress distribution within a prismatic specimen loaded uniaxially was determined by the three-dimensional finite element method. The stresses are nonuniform and vary from point to point. Prismatic specimens of Tennessee marble were loaded uniaxially. Pictures of the two adjacent side surfaces were taken simultaneously at various deformation levels. Crack patterns in these pictures were then traced in the transparency and compared for crack growth study. Grain boundary cracks were identified as griffith cracks. A model consisting of a crack subjected to the combination of modes 1 and 2 of basic crack surface displacement was developed. Quantitatively, the model was found applicable for describing the fracture processes of Tennessee marble specimens.
Proc. Internat. Conf. on Dynamic Crack Propagation, Lehigh Univ., Bethlehem, Pennsylvania, 7/10-12/72