The G/K predictions agree very well with published results using the conventional, double-node model and domain integration method. The toolkit can be used for the following simulation needs: 1) crack propagation, fatigue life prediction, multiple crack interaction, and sensitivity analysis and design optimization 2) 2D or 3D solid model in quasi-static, monotonic or fatigue loading 3) metallic fracture or composite delamination 4) elastic The usability of the toolkit is illustrated through a series of industrial problems. Proper understandings of fatigue crack propagation behavior with adequate accuracy are extremely important for the evaluation of ship structural strength and performance, where the prediction of a crack path is prerequisite. #REQUEST A SOFTWARE CRACK CRACKED#Ī step-by -step finite element approach has been proposed for fatigue crack path prediction, in which a cracked domain is remeshed by an automatic mesh generation algorithm. and the stress field ahead of the current crack tip is analyzed by applying the method of superposition of analytical and finite-element solutions. Using the stress field parameters ahead of the crack tip, a curved crack increment can be determined by the first order perturbation solution together with the local symmetry criterion. ![]() The crack tip then extends for a certain increment size and the procedure is repeated for next steps.Since the modified quadtree algorithm previously implemented has some difficulties in dealing with geometric boundary, several improvements in the computational code have been made in this research so that the possibility of erroneous meshing on boundary line, boundary corner and crack line is significantly reduced. A circular region around a crack tip with a prescribed regular mesh pattern is introduced, and an integer coordinate system, which naturally fits for the global geometry of the domain, is chosen so that quadrilateral elements with nearly square shape almost cover the whole domain except in the vicinity of curved boundaries.Simple non-collinear fatigue crack propagation experiments are carried out.
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