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Abaqus implementation of extended finite element method
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3860k
资源说明：A three-dimensional extended finite element method (X-FEM) coupled with a narrow band
fast marching method (FMM) is developed and implemented in the Abaqus finite element
package for curvilinear fatigue crack growth and life prediction analysis of metallic structures.
Given the level set representation of arbitrary crack geometry, the narrow band FMM
provides an efficient way to update the level set values of its evolving crack front. In order
to capture the plasticity induced crack closure effect, an element partition and state recovery
algorithm for dynamically allocated Gauss points is adopted for efficient integration of
historical state variables in the near-tip plastic zone. An element-based penalty approach is
also developed to model crack closure and friction. The proposed technique allows arbitrary
insertion of initial cracks, independent of a base 3D model, and allows non-self-similar
crack growth pattern without conforming to the existing mesh or local remeshing.
Several validation examples are presented to demonstrate the extraction of accurate stress
intensity factors for both static and growing cracks. Fatigue life prediction of a flawed helicopter
lift frame under the ASTERIX spectrum load is presented to demonstrate the analysis
procedure and capabilities of the method.
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