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 引用本文: 高洪芬 程玉民. 弹性力学的复变量数值流形方法[J]. 力学学报, 2009, 41(4): 480-488.
Hongfen Gao, Yumin Cheng. Complex variable numerical manifold method for elasticity[J]. Chinese Journal of Theoretical and Applied Mechanics, 2009, 41(4): 480-488.
 Citation: Hongfen Gao, Yumin Cheng. Complex variable numerical manifold method for elasticity[J]. Chinese Journal of Theoretical and Applied Mechanics, 2009, 41(4): 480-488.

## Complex variable numerical manifold method for elasticity

• 摘要: 数值流形方法通过引入数学和物理双重网格，将插值域和积分域分别定义在两个不同的覆盖上来完成系统能量泛函积分运算. 当采用高阶函数构造位移函数时，广义节点自由度将大大增加. 在求解系统的平衡方程中，运算量是与自由度的三次方成正比的，因此数值流形方法的计算量是较大的. 为此，在复变量理论的基础上，采用一维基函数建立二维问题的逼近试函数，然后将其应用于弹性力学的数值流形方法，提出了复变量数值流形方法，推导了弹性力学的复变量数值流形方法的公式. 与传统的数值流形方法相比，复变量数值流形方法具有计算量小、精度高的优点.

Abstract: The numerical manifold method (NMM) is a more generalnumerical method than finite element method with mathematical and physicalmeshes. The mathematical mesh provides the nodes to form a finite coveringof the solution domain and the partition of unity functions, while thephysical mesh provides the domain of integration. The numerical manifoldmethod has some advantages, for example, the solution domain is discretizedas an arbitrary mesh which is independent on the complex geometry of theboundary of the solution domain or the interface of bi-materials. However,the generalized degrees of freedom in the NMM will be enhanced to inducemore computing cost when the higher polynomial interpolating function isused as the displacement function. In this paper, based on the complexvariables theory, the approximation function of a two-dimensional problem isdeveloped with one-dimensional basis function, and the approximationfunction is applied to the NMM for two-dimensional elasticity. Then thecomplex variable numerical manifold method (CVNMM) for 2D elasticity ispresented, and the formulae of the CVNMM are obtained. The influences ofboundary conditions and initial stress on the final linear algebra equationssystem are discussed. In addition, two numerical cases were carried out.When the composite material structure is simulated using the CVNMM, thecomputing meshes can be easily generated along the interfaces of materials,then the CVNMM is more flexible than the finite element method. Furthermore,bi-material interface crack problem is analyzed using the CVNMM, and thestress intensity factor of the interface crack is obtained with thenumerical extrapolation method. The CVNMM has greater computationalefficiency and precision validated with the numerical cases.

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