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超奇异核积分方程——理论与在断裂力学中的应用

Integral Equations with Hypersingular Kernels -- Theory and Applications to Fracture Mechanics

Youn-Sha Chan, Albert C. Fannjiang, Glaucio H. Paulino

AI总结:

本文推导了含超奇异核的切比雪夫多项式积分的精确公式与系统评估方法,并应用于断裂力学中应力强度因子的计算,涵盖经典线弹性、功能梯度材料及梯度弹性理论等裂纹问题。

摘要:

研究了类型为 $I_α(T_n,m,r) = \int_{-1}^{1} \hpsngAbs \frac{T_n(s)(1-s^2)^{m-{1/2}}}{(s-r)^α}ds |r|<1$ 和 $I_α(U_n,m,r) = \int_{-1}^{1} \hpsngAbs \frac{U_n(s)(1-s^2)^{m-{1/2}}}{(s-r)^α}ds |r|<1$ 的超奇异积分,其中 $α$ 为正整数,$m$ 为非负整数,$T_n(s)$ 和 $U_n(s)$ 分别为第一类和第二类切比雪夫多项式。针对 $α= 1, 2, 3, 4$ 和 $m = 0, 1, 2, 3$ 的情形推导了精确公式,其中大部分是本文推导出的新解。此外,提供了一种当 $α> 4$ 且 $m>3$ 时评估这些积分的系统方法。同时计算了 $|r|>1$ 时的积分值,以便计算应力强度因子(SIFs)。给出并讨论了涉及裂纹问题的实例,重点强调了数学与断裂力学之间的联系。实例包括经典线弹性断裂力学(LEFM)、功能梯度材料(FGM)和梯度弹性理论。附录中提供了广泛积分类型的闭式解,作为论文的补充。

英文摘要:

Hypersingular integrals of the type $I_α(T_n,m,r) = \int_{-1}^{1} \hpsngAbs \frac{T_n(s)(1-s^2)^{m-{1/2}}}{(s-r)^α}ds |r|<1$ and $I_α(U_n,m,r) = \int_{-1}^{1} \hpsngAbs \frac{U_n(s)(1-s^2)^{m-{1/2}}}{(s-r)^α}ds |r|<1$ are investigated for general integers $α$ (positive) and $m$ (non-negative), where $T_n(s)$ and $U_n(s)$ are the Tchebyshev polynomials of the 1st and 2nd kinds, respectively. Exact formulas are derived for the cases $α= 1, 2, 3, 4$ and $m = 0, 1, 2, 3$; most of them corresponding to new solutions derived in this paper. Moreover, a systematic approach for evaluating these integrals when $α> 4$ and $m>3$ is provided. The integrals are also evaluated as $|r|>1$ in order to calculate stress intensity factors (SIFs). Examples involving crack problems are given and discussed with emphasis on the linkage between mathematics and mechanics of fracture. The examples include classical linear elastic fracture mechanics (LEFM), functionally graded materials (FGM), and gradient elasticity theory. An appendix, with closed form solutions for a broad class of integrals, supplements the paper.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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