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[求助] 回弹计算老出错

用的dynaform计算s型梁的回弹。有一次成功了，之后怎么算都出错，每次都提示severe (170): Program Exception - stack overflow，请问怎么解决啊？计算使用的空间也足够啊。
用的DF5.8，ansys-lsdyna求解器。成形完后，dynain法计算回弹。

计算过程如下：
。。。。（前面省略）
   1 t 0.0000E+00 dt 1.00E-03 write d3plot file          04/09/14 20:51:23

BEGIN implicit statics  step    1 t= 1.0000E-03          04/09/14 20:51:23

============================================================
            time =  1.00000E-03
current step size =  1.00000E-03

Memory required for implicit mtx strg  :    21427050
min. memory for in-core stiffness factorization=    80.1 Mw
forrtl: severe (170): Program Exception - stack overflow
Image             PC             Routine          Line       Source

ls971.exe       00000001447C7257  Unknown             Unknown  Unknown
ls971.exe       000000014421D2B3  MF2CNTLD                17  mf2Cntld.F
ls971.exe       0000000143FB8B14  MF2FACTORD             631  mf2Factord.F

ls971.exe       0000000142F9958E  IMFSLV_MF2             873  dyn50a.F
ls971.exe       000000014165CECC  LSOLVR                9606  dyn50.F
ls971.exe       0000000141646747  IMSOL1                1886  dyn50.F
ls971.exe       0000000141642057  IMSOLV                   883  dyn50.F
ls971.exe       0000000142521A54  FEM3D                   3793  fem3d.F
ls971.exe       000000014250B05A  SOLTN                   278  fem3d.F
ls971.exe       0000000140D10349  OVERLY                   175  dyn0.F
ls971.exe       000000014291F77C  LSDYNA1                1044  dynm.F
ls971.exe       0000000142920A55  MAIN__                1830  dynm.F
ls971.exe       00000001447C09F8  Unknown             Unknown  Unknown
ls971.exe       000000014478267F  Unknown             Unknown  Unknown
kernel32.dll    0000000076C9652D  Unknown             Unknown  Unknown
ntdll.dll       0000000076ECC521  Unknown             Unknown  Unknown
请按任意键继续. . .

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