利用柔性拆卸扰动对具有不确定性的材料非线性问题进行静态分析

IF 2.8 3区 工程技术 Q2 MECHANICS International Journal of Non-Linear Mechanics Pub Date : 2024-09-11 DOI:10.1016/j.ijnonlinmec.2024.104901
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引用次数: 0

摘要

大型结构的非线性有限元分析通常需要大量的计算费用,因为在计算过程中需要反复反演由非线性引起的修正刚度矩阵。如果考虑到材料的不确定性,非线性分析的计算将更加难以承受。为了提高计算效率,本研究基于柔性分解扰动(FDP)方法,开发了一种新的材料不确定性非线性分析方法。FDP 是一种可以快速计算刚度矩阵逆的算法。所提方法的基本思想是将 FDP 公式引入牛顿-拉夫逊迭代法,以加速非线性迭代计算。我们使用了三个数值实例(一个静定结构和两个静不定结构)来验证所提方法的准确性和效率。结果表明,建议方法的计算时间远远少于现有的完整分析和组合近似算法。在计算精度方面,对于静定结构,建议的算法可以获得与完整分析结果完全一致的精确解,而对于静不定结构,建议的算法可以获得与完整分析结果非常接近的近似解。
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Static analysis using flexibility disassembly perturbation for material nonlinear problem with uncertainty

Nonlinear finite element analysis of large-scale structures usually requires a lot of calculation cost, because it is necessary to repeatedly inverse the modified stiffness matrix caused by nonlinearity in the calculation process. When considering the uncertainty in materials, the calculation of the nonlinear analysis will be more unbearable. To improve the computational efficiency, this work develops a new method for nonlinear analysis with material uncertainty based on flexibility disassembly perturbation (FDP) approach. The FDP is an algorithm that can quickly calculate the inverse of a stiffness matrix. The basic idea of the proposed method is to introduce the FDP formula into Newton-Raphson iteration method to accelerate the nonlinear iterative calculation. Three numerical examples, one statically determinate structure and two statically indeterminate structures, are used to verify the accuracy and efficiency of the proposed method. The results show that the calculation time of the proposed method is far less than that of the existing complete analysis and combined approximation algorithms. In terms of computational accuracy, for statically determinate structures, the proposed algorithm can obtain exact solutions that are identical to the complete analysis results, while for statically indeterminate structures, the proposed algorithm can obtain approximate solutions that are very close to the complete analysis results.

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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
192
审稿时长
67 days
期刊介绍: The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.
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