血管支架压握计算不收敛

Leaffei

最近在做血管支架的仿真，图中，外面的圆筒是刚性压握工具，里面的是支架的一部分。支架材料是镍钛合金，采用的是ABAQUS自带的材料模型super elasticity。在进行支架压握模拟过程中，沿径向压缩0.5mm以内时计算正常，再继续压缩的时候计算不收敛（static求解）。出现如下警告：

***WARNING: THE SUPERELASTICITY ALGORITHM DID NOT CONVERGE AT 6 POINTS

***NOTE: MATERIAL CALCULATIONS FAILED TO CONVERGE OR WERE NOT ATTEMPTED AT ONE
          OR MORE POINTS. CONVERGENCE IS JUDGED UNLIKELY.

...
***WARNING: THE SYSTEM MATRIX HAS 13 NEGATIVE EIGENVALUES.
             EXPLANATIONS ARE SUGGESTED AFTER THE FIRST OCCURRENCE OF THIS MESSAGE.
   CONTACT PAIR (ASSEMBLY_SURF-STENT-CONTACT,ASSEMBLY_M_SURF-10) NODE
   STENT-ABAQUS-1.7523 IS OVERCLOSED BY 3.67715E-06.

***WARNING: THE SUPERELASTICITY ALGORITHM DID NOT CONVERGE AT 881 POINTS

***NOTE: MATERIAL CALCULATIONS FAILED TO CONVERGE OR WERE NOT ATTEMPTED AT ONE
          OR MORE POINTS. CONVERGENCE IS JUDGED UNLIKELY.

...
***WARNING: THE SUPERELASTICITY ALGORITHM DID NOT CONVERGE AT 2 POINTS


***NOTE: MATERIAL CALCULATIONS FAILED TO CONVERGE OR WERE NOT ATTEMPTED AT ONE
          OR MORE POINTS. CONVERGENCE IS JUDGED UNLIKELY.


***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT

***WARNING: THE SUPERELASTICITY ALGORITHM DID NOT CONVERGE AT 2 POINTS



计算不收敛，怀疑是材料的问题，但是不知道怎么调模型，请大家指教。

YHQ881892

可提供有偿代做，有需求时可加2797871439

likego0

应该是压握壳和支架的接触设置问题，有限滑移和小滑移改动一下试试

shusuyun

请问楼主刚性圆筒是怎么让它沿径向压缩？