A finite element procedure for rigorous numerical enclosures on the limit load in the analysis of multibody structures

A finite element procedure for rigorous numerical enclosures on the limit load in the analysis of multibody structures
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多体结构分析中极限载荷严格数值封闭的有限元程序

DOI:
10.1016/j.cma.2009.09.018
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发表时间:
2009
影响因子:
7.2
通讯作者:
Mihai L
Mihai L
中科院分区:
工程技术1区
文献类型:
--
作者:
Mihai L

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提出了一种严格的有限元数值程序,用于计算给定摩擦力下相互非穿透接触的线弹性块系统中的极限失效载荷的保证下限和上限。首先,将静态和运动学原理表述为连续优化问题,并建立无限维水平上相应极限载荷问题的解的存在性。设计了两种数值方法,一种针对每个极限载荷问题,以获得独特临界载荷的实际数值范围。第一种方法使用涉及应力的静态极限载荷问题以及非标准符合有限元方法来获得线性程序,从中可以导出极限载荷的下(安全)界和相应应力场的表达式。第二种方法使用运动学极限载荷问题来获得线性优化问题,从中可以确定极限载荷的上限(不安全)和失效模式的表达式。这些程序共同产生了限制载荷的严格数值范围。
A rigorous finite element numerical procedure is proposed for the computation of guaranteed lower and upper bounds for the limit load of failure in a system of linear-elastic blocks in mutual non-penetrative contact with given friction. First the static and kinematic principles are formulated as continuous optimization problems and existence of a solution to the corresponding limit load problems at the infinite dimensional level is established. Two numerical approaches are devised, one for each limit load problem, to obtain actual numerical bounds on the unique critical load. The first approach uses the static limit load problem involving stresses in conjunction with a non-standard conforming finite element method to obtain a linear program from which one can derive a lower (safe) bound for the limit load and an expression for the corresponding stress field. The second approach uses the kinematic limit load problem to obtain a linear optimization problem from which one can determine an upper (unsafe) bound for the limit load and an expression for the failure mode. Together, these procedures give rise to rigorous numerical enclosures on the limit load.
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