The MLS-based numerical manifold method with applications to crack analysis

The MLS-based numerical manifold method with applications to crack analysis
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基于MLS的数值流形方法及其在裂纹分析中的应用

DOI:
10.1007/s10704-014-9980-2
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发表时间:
2014-11
影响因子:
2.5
通讯作者:
Li Chunguang
Li Chunguang
中科院分区:
工程技术3区
文献类型:
--
作者:
Zheng Hong;Liu Feng;Li Chunguang

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数值流形方法(NMM)为了从连续体的角度统一地解决连续体变形与非连续体变形、小变形与大移动等问题,引入了数学覆盖(MC)和物理覆盖(PC)两种覆盖。该方法利用移动最小二乘(MLS)插值中节点的影响域生成MC,而不是常用的有限元网格,大大简化了PC的生成和裂纹扩展的模拟。与传统的无网格方法相比,基于MLS的NMM可以自然地处理复杂的几何形状,而不需要依赖那些复杂但人为的准则或操作。此外,与基于FE的NMM相比,基于MLS的NMM更容易处理由裂纹引起的大移动。
In order to solve problems, from a continuum point of view and in a unified way, involving continuum and discontinuum deformation, and small deformation and large movement, the numerical manifold method (NMM) introduces two covers, namely the mathematical cover (MC) and the physical cover (PC). This study generates the MC with the influence domains of nodes in the moving least squares (MLS) interpolation instead of commonly-used finite element meshes, significantly simplifying the generation of PCs and the simulation of crack growth. Advantageous over the conventional meshfree method, the MLS-based NMM can naturally treat complex geometry without recourse to those complicated but contrived criteria or operations. Moreover, the treatment of large movement caused by cracking is much easier with the MLS-based NMM than with the FE-based NMM.
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