夹层板冲击错误提示

是这样子的，可以考虑加section controls来控制，但是要注意加这样的语句是对加速度有影响的。以下是例句：
*SOLID SECTION, ELSET=P3;solidmesh_foam, controls=EC-1,MATERIAL=M4;foam
*Section Controls, name=EC-1, DISTORTION CONTROL, length ratio=0.1 （这个取值范围在0<a<=1之间，也可以写成YES,这句加在material前就可以）
*section controls是6.5新推出的一个关键字，详细的内容可以查阅ABAQUS KEYWORDS REFERENCE MANUAL.
This parameter applies only to ABAQUS/Explicit analyses.
Set DISTORTION CONTROL=YES to activate a constraint that acts to prevent negative element volumes or other excessive distortion for crushable materials. This is the default value for elements with hyperelastic or hyperfoam materials. The DISTORTION CONTROL parameter is not relevant for linear kinematics and cannot prevent elements from being distorted due to temporal instabilities, hourglass instabilities, or physically unrealistic deformation.
Set DISTORTION CONTROL=NO to deactivate a constraint that acts to prevent negative element volumes or other excessive distortion for crushable materials. This value is the default except for elements with hyperelastic or hyperfoam materials.
By default, the constraint penalty forces are applied when the node moves to a point a small offset distance away from the actual plane of constraint. This appears to improve the robustness of the method and limits the reduction of time increment due to severe shortening of the element characteristic length. This offset distance is determined by the distortion length ratio times the initial element characteristic length. The default value of the distortion length ratio, r, is 0.1. You can change the distortion length ratio by specifying a value for r,
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