Analysis of Mixed-Mode Cracks in a Rubbery Particulate Composite
AIR FORCE RESEARCH LAB EDWARDS AFB CA
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The mixed-mode loading of a rubbery particulate composite is studied experimentally. Linear fracture mechanics concepts are used to determine the initiation of growth, the initial growth direction, and the subsequent growth rate for a range of mode mixities. The fracture toughness locus is determined to be elliptical, with the mode II toughness being lower than its mode I counterpart. The initial growth directions correlate with maximum strain energy density theories. The crack growth rates can be modeled effectively using an equivalent mode I crack.