Precise 3D crack growth simulations |
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Authors: | W Weber P Steinmann G Kuhn |
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Affiliation: | (1) Institute of Applied Mechanics, University of Erlangen-Nuremberg, Egerlandstr. 5, 91058 Erlangen, Germany |
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Abstract: | The continuous growth of 3D cracks under cyclic loading conditions is considered within a discrete simulation procedure. It
is performed within the framework of linear elastic fracture mechanics. An incremental procedure is applied to consider the
non-linear behavior of crack growth within the simulation. In each increment the direction and magnitude of the crack propagation
for each point along the crack front are needed to define the new crack front. Within the present context the crack deflection
results from the maximum tangential stress criterion and the crack extension is obtained by the evaluation of a crack propagation
rate. To simulate the crack propagation as exactly as possible the evolution of the stress field between two consecutive crack
fronts is taken into account. The analysis of the changing stress field is utilized for optimization of the predicted crack
fronts. The whole procedure is realized in terms of a predictor–corrector scheme. Numerical examples are presented to demonstrate
the benefits of this concept. |
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Keywords: | 3D crack growth simulation Predictor– corrector scheme 3D crack growth criterion |
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