Abstract
In this paper, a novel numerical solution procedure is developed for the upper bound shakedown analysis of elastic-perfectly plastic structures. The nodal natural element method (nodal-NEM) combines the advantages of the NEM and the stabilized conforming nodal integration scheme, and is used to discretize the established mathematical programming formulation of upper bound shakedown analysis based on Koiter’s theorem. In this formulation, the displacement field is approximated by using the Sibson interpolation and the difficulty caused by the time integration is solved by König’s technique. Meanwhile, the nonlinear and non-differentiable characteristic of objective function is overcome by distinguishing non-plastic areas from plastic areas and modifying associated constraint conditions and goal function at each iteration step. Finally, the objective function subjected to several equality constraints is linearized and the upper bound shakedown load multiplier is obtained. This direct iterative process can ensure the shakedown load to monotonically converge to the upper bound of true solution. Several typical numerical examples confirm the efficiency and accuracy of the proposed method.
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Acknowledgments
S. Zhou is supported by the Chinese Postdoctoral Science Foundation (2013M540934). Y. Liu is supported by the National Science Foundation for Distinguished Young Scholars of China (11325211). D. Wang is supported by the National Natural Science Foundation of China (11222221). K. Wang is supported by the Project of Shandong Province Higher Educational Science and Technology Program (J13LG51).
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Zhou, S., Liu, Y., Wang, D. et al. Upper bound shakedown analysis with the nodal natural element method. Comput Mech 54, 1111–1128 (2014). https://doi.org/10.1007/s00466-014-1043-z
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DOI: https://doi.org/10.1007/s00466-014-1043-z