【摘要】 在传统有限元的框架上提出一个能模拟诸如裂纹、节理等非连续性结构的新技术———非连续有限元法,该方法通过反映非连续场和尖端渐进场的附加函数来丰富传统有限元的近似模式,以达到场内非协调的目的;该技术允许整个非连续性结构独立于网格,使得在模拟非连续性结构(裂纹、节理等)的演化发展时无需重剖网格.详细讨论了非连续附加函数的构造,并用弱解形式推导了非连续有限元格式,并给出算例.更多还原

【Abstract】 A new technique for modeling discontinuities,such as cracks and joints in the finite element framework,was presented.A standard displacement-based approximation was enriched near a discontinuity by incorporating the enrichment functions for both discontinuous fields and near tip asymptotic fields.The technique allows the entire discontinuities to be independent of the mesh,therefore remeshing is unnecessary to model the evolvement of discontinuities.Moreover,the construction of the discontinuous enrichment function was discussed in detail,and the discontinuous finite element discrete equation was deduced from the weak form.Numerical experiments were provided to demonstrate the utility and robustness of the proposed technique.更多还原