求助：LS-DYNA算了一定的时间总是报错，帮忙看一下，谢了！
The LS-DYNA time step size should not exceed 0.780E-06to avoid contact instabilities.If the step size is
bigger then scale the penalty of the offending surface.
0 t 0.0000E+00 dt 0.00E+00 flush i/o buffers
1 t 0.0000E+00 dt 5.03E-07 flush i/o buffers
1 t 0.0000E+00 dt 5.03E-07 write d3plot file
1 t 0.0000E+00 dt 5.03E-07 write ANSYS result file
5000 t 2.5150E-03 dt 5.03E-07 flush i/o buffers
10000 t 5.0305E-03 dt 5.03E-07 flush i/o buffers
12920 t 6.4996E-03 dt 5.03E-07 write d3plot file
12920 t 6.4996E-03 dt 5.03E-07 write ANSYS result file
15000 t 7.5481E-03 dt 5.03E-07 flush i/o buffers
20000 t 7.8478E-03 dt 1.09E-08 flush i/o buffers
*** Error negative volume in brick element # 13432 cycle 22652
******** minimum time step size reached *********
On a restart minimum timestep will be0.000E+00
22652 t 7.8757E-03 dt-5.63E-07 write d3plot file
22652 t 7.8757E-03 dt-5.63E-07 write ANSYS result file
E r r o r t e r m i n a t i o n
Memory required for explicit solution: 2317139
Additional dynamically allocated memory: 29960
Total: 2347099
T i m i n g i n f o r m a t i o n
CPU(seconds) %CPUClock(seconds) %Clock
----------------------------------------------------------------
Initialization ....... 0.0000E+00 0.00 0.0000E+00 0.00
Element processing ... 1.6180E+03 98.42 1.6199E+03 98.49
Binary databases ..... 1.0000E+00 0.06 8.7600E-01 0.05
ASCII database ....... 1.0000E+00 0.06 1.2600E-01 0.01
Contact algorithm .... 1.7000E+01 1.03 1.6665E+01 1.01
Contact entities ..... 0.0000E+00 0.00 0.0000E+00 0.00
Rigid bodies ......... 7.0000E+00 0.43 7.0990E+00 0.43
Implicit Nonlinear ... 0.0000E+00 0.00 0.0000E+00 0.00
Implicit Lin. Alg. ... 0.0000E+00 0.00 0.0000E+00 0.00
----------------------------------------------------------------
T o t a l s 1.6440E+03100.00 1.6447E+03100.00
Problem time = 7.8757E-03
Problem cycle = 22652
Total CPU time = 1644 seconds ( 0 hours 27 minutes 24 seconds)
CPU time per zone cycle= 3151 nanoseconds
Clock time per zone cycle= 3153 nanoseconds
Number of CPU's 1
Start time 11/09/2006 23:00:12
End time 11/09/2006 23:27:42
Elapsed time 1650 seconds ( 0 hours 27 minutes 30 seconds)
E r r o r t e r m i n a t i o n
这个是massage里面报错的信息，哪位高手帮我看看，哪里出错了啊。
运行了27分钟就自己停下来了，是怎么回事啊？ 我以前做个类似的例子,但结果出现了ERROR termination ,后来我调整了时间步长,以及材料参数,normal termination .我觉得应该时间步长的问题,可以看看状态方程的选择是否合适. 谢谢回复，如何调整时间步长呢？在time control里面调整吗？我以前默认的值是0.9，要调到多少才合适呢？
另外问一个比较菜的问题，状态方程是什么呢？我就考虑一个物体撞击另一个物体，计算被撞物体的变形。就是按照一般的自由落体来考虑的。
谢谢！ 负体积问题：1）时间步长调小一点；2）调整一下材料模型，单元类型；3）模型的网格尽量划分得均匀一些。
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