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Stress Intensity Factor Analysis for Non-Homogeneous Materials Based on Secondary Development of ABAQUS

Fengnan Guo^1,*, Yiming Li¹, Hua Zhang¹, Jianwei Cui²

1 School of Aeronautics and Astronautics, Dalian University of Technology, Dalian, 116024, China
2 The 41st Institute of Sixth Academy of CASIC, Huhhot, 010010, China

* Corresponding Author: Fengnan Guo. Email:

The International Conference on Computational & Experimental Engineering and Sciences 2025, 33(4), 1-3. https://doi.org/10.32604/icces.2025.011409

Abstract

The stress intensity factor (SIF) is one of the most crucial parameters in fracture mechanics, as it can effectively characterize the state of the crack and determine its propagation behavior. The methods for evaluating the stress intensity factor mainly include the J-integral method, interaction integral method, and displacement extrapolation method [1,2]. However, the conventional J-integral and interaction integral methods involve derivative terms of material parameters, which cause a great difficulty in applying these methods to deal with non-homogeneous materials containing material interfaces. In order to overcome this difficulty, an improved interaction integral method has been proposed [3]. This approach introduces a suitably designed auxiliary field to eliminate the derivative terms of material parameters in the interaction integral, which enables the direct extraction of the stress intensity factor at the crack tip without considering the material interfaces. Based on this form of the interaction integral, this paper utilizes the secondary development of ABAQUS to extract the simulation results from the specified analysis step. By programming the post-processing results, the study achieves the rapid computation of the novel interaction integral [4]. To verify the accuracy of the program, examples of homogeneous materials containing cracks were selected for the calculation of crack parameters. The results demonstrate that the program's calculations are in good agreement with those obtained from theory and simulation. Finally, examples with complex interfaces in two and three dimensions were selected to calculate fracture parameters. Compared with simulation results, the self-developed numerical procedure in this study demonstrates robust domain independence when calculating fracture parameters in materials with complex interfaces. This new method avoids intermediate data processing, improves the efficiency of parameter extraction, and extends the application scope of ABAQUS for calculating fracture parameters of non-homogeneous materials, especially for those integral domains intersecting other interfaces.

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