abaqus三点弯曲报错以及载荷位移曲线剧烈震荡问题

用abaqus Explicit做三点弯曲仿真模拟，共遇到了以下几个问题：

1. 运行一段时间报错终止

   The ratio of deformation speed to wave speed exceeds 1.0000 in at least one element. This usually indicates an error with the model definition. Additional diagnostic information may be found in the message file.

2. 运行一段时间报错终止
   

   The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively.

   There is only one excessively distorted element

   The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively.

3. 运行顺利结束，但是载荷位移曲线剧烈震荡，显然不对，但是不知道哪里出错了。
   

   
   以上前两个问题是运行之中报错；最后一个是运行顺利结束，但是结果不对，请问有没有大神知道这都该如何改？谢谢