讨论了一类拟线性粘弹性方程在半离散和全离散格式下的带约束的旋转Q1非协调有限元逼近.通过运用该元的相容误差可达到O(h^2)阶分别导出了L^2模和H^1模意义下的最优收敛阶和超逼近性.对于提出的全离散逼近格式,得到了最优误差估计.
In this paper, the constrained rotated Q1 nonconforming finite element approximation is discussed for a class of quasi-linear viscoelasticity equations under semi-discrete and fully-discrete schemes. Based on the compatibility error of the element is of order O(h^2), the optimal convergence order and superclose property in L^2 and broken H^1 norms are derived, respectively. The optimal order error estimate is also obtained for a proposed fully-discrete approximation scheme.