Abstract
Crack growth patterns are predicted by application of the strain energy density theory. The direction and amount of crack growth are dictated by the relative minima of the strain energy density function, dW/dV, whose critical value is material dependent. In large structures, the energy dissipated by crack growth can dominate while plastic deformation plays a minor role. Because loading in service can often vary in an unpredictable manner, energy released during crack growth can be a highly nonlinear process. The precise dependency of crack growth on load time history is analyzed in detail for a centrally cracked panel. Load history are shown to effect the critical failure loads in ways that are not intuitively obvious.
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