求助各位前辈ansys/lsdyna改变时间步长出现警告咋回事？ 50

There are 18540 elements in the selected set that currently fit at least one of the following descriptions: (1) Type #165 spring-damper; (2) Type #166 mass; (3) Specified to be rigid; (4) Has a zero value for at least one of the following material properties: EX, DENS, NUXY. Time steps are not calculated by the EDTP command for these elements. The time step value for these elements is set to max of all elements for plotting and listing purposes only. 可是我就只设置了solid164单元啊，没有刚体（设置的增大弹性模量2e+30的等效刚体），弹性模量、泊松比、密度、屈服强度、切线模数都有，请教到底怎么回事？