请教：单向动态拉伸中的问题

我这个模型是一块矩形薄板，左边线上的节点受水平x方向的约束，下边线上再给一个节点施加y方向的约束，在板的右边线的节点上施加随时间变化的位移载荷（就是均匀拉伸）。
单元类型：solid162; 材料：弹塑性线性强化，ex=2.07e11,泊松比=0.3；密度为7830；屈服应力为5.0e8；强化模量为2.0e7。
我感觉这个动态拉伸计算出来以后板的变形应该是比较均匀的，应力应变分布也应该是比较均匀的，可是实际计算出来的结果看到，板的变形很不均匀，还有带状的应力集中区域，如附件中图片所示。而我用 ansys的瞬态动力学方法计算，得出的结果就很合理，板的变形规则，应力也很均匀。请大家讨论一下为什么在dyna里边作的结果就不合理呢，是软件问题还是我操作的问题，k文件我也传上来，请大家看看，讨论一下啊。
我的qq ;58265482,欢迎讨论！
k文件：
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