应力约束下拓扑优化 求高手指点迷津

chongbin

应力约束下做拓扑优化，绿色设计区体积最小为优化目标，总是出现柔性过大的错误，不知该如何进行设置
鼓起部分为固定约束部位
在拓扑优化前做过Radioss，应力正常，变形也正常

chongbin

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** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

                        **** END OF REPORT ****

For Useful OptiStruct Tips and Tricks, go to the URL:
http://www.altairhyperworks.com/tips.aspx

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RADIOSS/OptiStruct error termination report:
  RAM:              95 MB total,     95 MB used.
  Data arrays:     417 total,       206 allocated.
  DATA SET size     46 MB, ram_disk      2 MB

DATASET USAGE: ndirs: 1, nfiles 1, nsets: 10, nblocks: 10, mode: 8
DIR: 0, size 45.4[MB], path "D:/10.30/" num_files 1
---
PROGRAM STOPPED DUE TO ERROR.

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A fatal error has occurred during computations:

  ** ERROR #  312 **
  In static load case            1
  the compliance is negative or large   4.383816E+11
  Optimization/buckling analysis cannot be performed
  due to possible rigid body mode

OPTIMIZATION HAS CONVERGED.

  FEASIBLE DESIGN.
  ...

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417332551

静态工况载荷1中，应变能奇异或过大。由于可能存在的的刚体模型，屈曲优化分析不能执行。不知道对不对？？