姚振汉. 真实梁板壳局部应力分析的高性能边界元法[J]. 工程力学, 2015, 32(8): 8-8. DOI: 10.6052/j.issn.1000-4750.2014.06.ST02
引用本文: 姚振汉. 真实梁板壳局部应力分析的高性能边界元法[J]. 工程力学, 2015, 32(8): 8-8. DOI: 10.6052/j.issn.1000-4750.2014.06.ST02
YAO Zhen-han. HIGH-PERFORMANCE BOUNDARY ELEMENT METHOD FOR THE LOCAL STRESS ANALYSIS OF REAL BEAM, PLATE AND SHELL[J]. Engineering Mechanics, 2015, 32(8): 8-8. DOI: 10.6052/j.issn.1000-4750.2014.06.ST02
Citation: YAO Zhen-han. HIGH-PERFORMANCE BOUNDARY ELEMENT METHOD FOR THE LOCAL STRESS ANALYSIS OF REAL BEAM, PLATE AND SHELL[J]. Engineering Mechanics, 2015, 32(8): 8-8. DOI: 10.6052/j.issn.1000-4750.2014.06.ST02

真实梁板壳局部应力分析的高性能边界元法

HIGH-PERFORMANCE BOUNDARY ELEMENT METHOD FOR THE LOCAL STRESS ANALYSIS OF REAL BEAM, PLATE AND SHELL

  • 摘要: 经过数十年的发展边界元法在学术界已被看成有限元法的重要补充,但是要使这种补充成为工程界的实际需要还必须用它解决一些有限元法和其他方法难以解决的问题,这就是要充分发挥其高精度的优势,对一些复杂问题得到可靠的结果。为此作者近年通过误差分析提出了一种高精度边界元法计算方案,它在没有解析解和其他数值解做比较的情况下也能求得边界元法的收敛解。这种新方法的一个重要应用领域就是真实梁板壳结构的局部应力分析,即考虑梁板壳结构边缘实际几何、和基座或周围构件联合进行三维高精度边界元分析。该文给出了两个二维高精度边界元分析的算例,一个是真实悬臂薄板梁的横向弯曲,另一个是承受内压的无限长加肋圆柱壳,其中前一个算例揭示了真实悬臂薄板梁端部的局部应力远高于由梁弯曲理论所得到的应力。该文同时建立了悬臂薄板梁三维分析的边界元模型,其边界自由度数已经超出了在微机上用常规边界元法能够求解的规模。因此必须将高精度边界元法结合快速算法才能胜任此类分析,这就是作者提出的高性能边界元法的含义。最后作者展望了这两个相关新领域将要开展的研究内容,希望起到抛砖引玉的作用。

     

    Abstract: After the development for decades, the BEM has been regarded as an important supplement of the FEM in academic community. However, to make it become the actual need in engineering, it must solve some problems which are difficult to be solved by the FEM and other methods. In order to give full play to its advantage of higher accuracy, and to obtain reliable results for some complex problems, the author presented a high accuracy BEM scheme in recent years through error analysis, and it can also obtain the converged solution of the BEM in the absence of analytical and other numerical solutions for comparison. An important application of this new scheme is the local stress analysis of a real beam, a plate and a shell structure, and that is the high accuracy 3D BE analysis of the beam, plate and shell combined with the peripheral structural members or foundations, considering the real geometrical details. Two examples of 2D high accuracy BE analysis are presented, one for transverse bending of a real clamped thin-plate beam, and another for a stiffened circular cylindrical shell. The former reveals that the local stress on the cantilever end is much higher than the stress obtained by the beam bending theory. A 3D BE model for a real clamped thin-plate beam is constructed, and the boundary degrees of freedom beyond the limit of scale can be solved on PC using conventional BEM. Thusly, it must be solved by the high performance BEM, namely the high accuracy BE analysis combined with fast algorithms. Finally, the author look forward some future work on these two related new fields, hoping to play a valuable role.

     

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