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Stable and realistic crack pattern generation using a cracking node method

Frontiers of Computer Science 2018年第4期12卷 777-797页

作者： Juan ZHANG Fuqing DUAN Mingquan ZHOU Dongcan JIANG Xuesong WANG Zhongke WU Youliang HUANG Guoguang DU Shaolong LIU Pengbo ZHOU Xiangang SHANG College of Computer Science and Technology Beijing Normal University Beijing 100875 China College of Art and Communication Beijing Normal University Beijing 100875 China School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

This paper presents a method for simulating surface crack patterns appearing in ceramic glaze, glass, wood and mud. It uses a physically and heuristically combined method to model this type of crack pattern. A stress field is defined heuristically over the triangle mesh of an object. Then, a first-order quasi-static cracking node method （CNM） is used to model deformation. A novel combined stress and energy combined crack criterion is employed to address crack initiation and propagation separately according to physics. Meanwhile, a highest-stress-first rule is applied in crack initiation, and a breadth-first rule is applied in crack propagation. Finally, a local stress relaxation step is employed to evolve the stress field and avoid shattering artifacts. Other related issues are also discussed, such as the elimination of quadra- ture sub-cells, the prevention of parallel cracks and spurious crack procession. Using this method, a variety of crack patterns observed in the real world can be reproduced by changing a set of parameters. Consequently, our method is robust because the computational mesh is independent of dynamic cracks and has no sliver elements. We evaluate the realism of our results by comparing them with photographs of realworld examples. Further, we demonstrate the controllability of our method by varying different parameters.

关键词： crack pattern generation fracture simulation physically-based extend finite element method crack nodemethod

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