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A Nitsche extended finite element method for incompressible elasticity with discontinuous modulus of elasticity

机译:具有不连续弹性模量的不可压缩弹性的Nitsche扩展有限元方法

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In this note we propose a finite element method for incompressible (or compressible) elasticity problems with discontinuous modulus of elasticity (or, if compressible, Poisson's ratio). The problem is written on mixed form using P~1-continuous displacements and elementwise P~0 pressures, leading to the possibility of eliminating the pressure beforehand in the compressible case. In the incompressible case, the method is augmented by a stabilization term, penalizing the pressure jumps. We show a priori error estimates under certain regularity hypothesis. In particular we prove that if the exact solution is sufficiently smooth in each subdomain then the convergence order is optimal.
机译:在本说明中,我们针对具有不连续弹性模量(或者,如果是可压缩的,泊松比)的不可压缩(或可压缩)弹性问题提出了一种有限元方法。问题是使用P〜1连续位移和元素P〜0压力以混合形式编写的,从而有可能在可压缩情况下预先消除压力。在不可压缩的情况下,该方法会增加一个稳定项,以惩罚压力跳变。我们显示了某些规律性假设下的先验误差估计。特别是,我们证明了,如果精确的解在每个子域中都足够平滑,则收敛顺序是最佳的。

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