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首页> 外文期刊>International Journal for Numerical Methods in Engineering >Novel displacement function for discontinuous deformation analysis based on mean value coordinates
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Novel displacement function for discontinuous deformation analysis based on mean value coordinates

机译:基于平均值坐标的不连续变形分析的新型位移函数

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摘要

The rotation degree of freedom in discontinuous deformation analysis (DDA) may cause false volume expansion when a block undergoes a large rotation. We propose a block displacement function to prevent this defect. Specifically, the degrees of freedom in a block are redefined by incremental displacements at its vertices, and displacement is formulated based on the mean value coordinates. In addition, the finite element method with updated Lagrangian formulation is employed to derive the equilibrium equations, while the contact analysis and implicit time integration for dynamics is maintained from the original DDA. After each time step, the block configuration is updated by adding the new degrees of freedom to the previous coordinates of the block vertices. Results from numerical examples confirm the effectiveness of the proposed approach to prevent false volume expansion, ensure correctness of contact analysis, and provide realistic stress results when simulating large rotations.
机译:当块经历大旋转时,不连续变形分析(DDA)中自由度(DDA)的旋转程度可能导致假体积膨胀。 我们提出了一种阻止位移功能,以防止这种缺陷。 具体地,通过其顶点处的增量位移重新定义块中的自由度,并且基于平均值坐标配制位移。 此外,采用更新拉格朗日配方的有限元方法来得出平衡方程,而动态的接触分析和隐式时间集成是从原始DDA维持的。 在每次步骤之后,通过将新的自由度添加到块顶点的先前坐标来更新块配置。 来自数值例子的结果证实了所提出的方法的有效性,以防止虚假体积扩展,确保接触分析的正确性,并在模拟大旋转时提供现实的应力结果。

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