J-Integral Decomposition Technical Brief
Abstract: The computation of the energy release rate has been used for many years to determine the onset of crack propagation. In recent years, the use of composite materials has become common practice in the aerospace industry and correlating the energy release rate with crack propagation, originally developed for isotropic materials in a 2D setting, is now been extended to structures made of laminated composites. For most cases of interest, the energy release rate has to be computed in a three dimensional setting for bi material crack interfaces and orthotropic material properties. Moreover, given the typical complexity of the displacement and stress fields associated with composite materials, the analysis requires the computation of the energy release rate components associated with each failure mode (i.e., Modes I, II and III).
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“As the United States Air Force continues to extend the service life of their aircraft the Aircraft Structural Integrity Program (ASIP) has had to refine the methods it uses to analyze and predict fatigue crack growth. Through the use StressCheck®, coupled with AFGROW, we in A-10 ASIP have been able to more accurately model, predict and analyze critical aircraft structure for the A-10 and other types of structure for non-A-10 system managers. This also allows us within the A-10 to more accurately assess risk for decision makers, streamline aircraft inductions into scheduled maintenance and reduce cost for total life cycle management.”
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