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arXiv 1609.03326math.NAcs.NA
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增广拉格朗日有限元方法用于接触问题

Augmented Lagrangian finite element methods for contact problems

University College London(伦敦大学学院);Jönköping University(延雪平大学);Umeå University(于默奥大学)

Erik Burman, Peter Hansbo, Mats Larson

AI总结:

本文提出两种不同的拉格朗日乘子方法,用于解决接触问题,分析了连续和不连续逼近空间下的稳定性及收敛性。

摘要:

我们提出两种不同的拉格朗日乘子方法,用于接触问题,这些方法源自增广拉格朗日变分公式。考虑了障碍问题(在体积域内对解施加约束)和Signorini问题(施加侧向接触条件)。我们考虑了连续和不连续的拉格朗日乘子逼近空间。在后者情况下,方法不稳定,必须对乘子的跳跃施加惩罚以保证稳定性。我们证明了离散解的存在性和唯一性,最佳逼近估计和收敛估计,这些估计与解的正则性相比是最佳的。

英文摘要:

We propose two different Lagrange multiplier methods for contact problems derived from the augmented Lagrangian variational formulation. Both the obstacle problem, where a constraint on the solution is imposed in the bulk domain and the Signorini problem, where a lateral contact condition is imposed are considered. We consider both continuous and discontinuous approximation spaces for the Lagrange multiplier. In the latter case the method is unstable and a penalty on the jump of the multiplier must be applied for stability. We prove the existence and uniqueness of discrete solutions, best approximation estimates and convergence estimates that are optimal compared to the regularity of the solution.

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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