Efficient simulation of crack growth in multiple-crack systems considering internal boundaries and interfaces
The paper presents numericalmethods used for predicting crack paths in technical structures based on the theory of linear elastic fracture mechanics.To simulate crack growth,the FE-method is used in combination with a smart re-meshing algorithm.Different methods providing accurate crack loading parameters particularly for curved cracks such as the J-integral or stress intensity factors (SIF) are presented.Path-independent contour integrals 12 are used to avoid special requirements concerning crack tip meshing and to enable efficient calculations for domains including interfaces and internal boundaries.The integration paths being finite and far from the crack tip,special attention has to be directed to the treatment of the crack face integral since the calculation of the coordinate J2 is challenging 5.The same holds for the coordinate MII 2 of the interaction integral related to a mode-II auxiliary loading.In particular,the interaction of multiple cracks and internal boundaries and interfaces is investigated.Calculating the global J-integral,including all crack tips existing in a structure,leads to the necessity of a separation procedure to determine the parts of J related to each single crack tip.
J-integral M-integral mixed-mode fracture curved crack faces fictitious crack faces
Paul Judt Andreas Ricoeur
Department of Engineering Mechanics,University of Kassel,34125 Kassel,Germany
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）