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-  2018 

平面Cosserat弹性体广义等参元 Generlized isoparametric finite elements for plane elastic Cosserat bodies

Keywords: Cosserat理论,广义等参元,形函数,耦合附加项

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Abstract:

将广义等参元理论和Cosserat理论相结合,考虑Cosserat弹性体单元内部不同方向位移间的耦合效应,通过在位移插值形函数中引入耦合附加项,构造了平面Cosserat弹性体4节点广义等参元,并基于自然变分原理,推导了耦合附加项的函数表达式,进而得到广义等参元列式.为了验证单元的适用性,构造了2个不同的分片实验并进行程序实现,结果显示所构造的广义等参元能通过该分片试验.最后分析了悬臂梁弯曲问题和圆孔应力集中问题,结果表明单元数值精度较高.该方法在保证单元协调性和自由度保持不变的情况下,提高了单元的精度;单元基于自然变分原理并且只在传统等参元插值形函数的基础上增加耦合项,程序操作简单且易于实现

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