血管内支架与血管壁的接触问题

cutefatfat

大家好，请教一下接触的问题，上传了源文件，希望各位师兄师姐帮帮忙解决
本人在做一个“血管内支架与血管壁接触”的问题
由于支架比较复杂，用了42个volumn来建立，而血管虽然像一个pipe的四分之一，但是设置成由四个volumn 结合而成（主要想与后续问题结合起来）
所以在设置contact时就很麻烦了
支架是在内表面给力，本来不接触血管，然后在力的作用下撑开，最后把血管撑大一点，当然此时已经接触血管并且两者互相独立，不能有“陷入”的问题。
问题：
1、支架由很多体建成，所以设置contact surface时，系统不默认人眼所认为在支架外表面（即与血管接触那一面）的42个小面为一个统一体。所以我想把他们全都写在contact surface1里面时，系统警告这些面互相不是connected的。而实际上它们相连
所以我只能把它们当成一个个独立的surface来设置，请问这样可以吗？

2系统运行时出现以下问题，很着急
*** W A R N I N G ***

CONTACT GROUP NUMBER=
1

SOME CONTACT NODES BELONG TO MORE THAN ONE CONTACTOR SURFACE.

THIS MAY RESULT IN OVERCONSTRAINING ESPECIALLY WITH FRICTION.
MESH TOO DISTORTED (JACOBIAN DETERMINANT NOT POSITIVE)



*** S T O P ***

AUTOMATIC-LDC METHOD CANNOT CONVERGE IN THE FIRST STEP

RESTART WITH A SMALLER DISPLACEMENT IN THE AUTOMATIC-LDC:

I.E.
AUTOMATIC-LDC NOD=... DISPL=... DIR=...
INTERMEDIATE ITERATION RESULTS CAN BE OBTAINED BY

REQUESTING DETAILED ITERATION HISTORY PRINTOUT.



DIFFERENT SOLUTION STRATEGY MAY BE USED TO RERUN

THE ANALYSIS, SEE THE THEORY AND MODELING GUIDE.
***WARNING: Contactor node 2543 belongs to different contactor surfaces 6 and 5 in contact group 1

Contactor node 2555 belongs to different contactor surfaces 6 and 5 in contact group 1

Contactor node 2539 belongs to different contactor surfaces 6 and 5 in contact group 1

Contactor node 2849 belongs to different contactor surfaces 8 and 7 in contact group 1

Contactor node 2861 belongs to different contactor surfaces 8 and 7 in contact group 1

Contactor node 2845 belongs to different contactor surfaces 8 and 7 in contact group 1

Contactor node 2512 belongs to different contactor surfaces 13 and 4 in contact group 1


Contactor node 2637 belongs to different contactor surfaces 13 and 10 in contact group 1

Contactor node 2540 belongs to different contactor surfaces 14 and 5 in contact group 1

Contactor node 2636 belongs to different contactor surfaces 14 and 10 in contact group 1

Contactor node 2827 belongs to different contactor surfaces 15 and 6 in contact group 1

Contactor node 2934 belongs to different contactor surfaces 15 and 11 in contact group 1

Contactor node 2846 belongs to different contactor surfaces 16 and 7 in contact group 1

Contactor node 2933 belongs to different contactor surfaces 16 and 11 in contact group 1

Contactor node 3124 belongs to different contactor surfaces 17 and 8 in contact group 1

Contactor node 3231 belongs to different contactor surfaces 17 and 12 in contact group 1

Contactor node 3143 belongs to different contactor surfaces 18 and 9 in contact group 1

Contactor node 3230 belongs to different contactor surfaces 18 and 12 in contact group 1

Contactor node 2570 belongs to different contactor surfaces 19 and 13 in contact group 1

Contactor node 2598 belongs to different contactor surfaces 20 and 14 in contact group 1

Contactor node 2874 belongs to different contactor surfaces 21 and 15 in contact group 1

Contactor node 2597 belongs to different contactor surfaces 21 and 20 in contact group 1

Contactor node 2609 belongs to different contactor surfaces 21 and 20 in contact group 1

Contactor node 2593 belongs to different contactor surfaces 21 and 20 in contact group 1

Contactor node 2895 belongs to different contactor surfaces 22 and 16 in contact group 1

Contactor node 3171 belongs to different contactor surfaces 23 and 17 in contact group 1

Contactor node 2894 belongs to different contactor surfaces 23 and 22 in contact group 1

Contactor node 2906 belongs to different contactor surfaces 23 and 22 in contact group 1

Contactor node 2890 belongs to different contactor surfaces 23 and 22 in contact group 1

Contactor node 3192 belongs to different contactor surfaces 24 and 18 in contact group 1

Contactor node 2576 belongs to different contactor surfaces 25 and 19 in contact group 1

Contactor node 2571 belongs to different contactor surfaces 25 and 19 in contact group 1

Contactor node 2665 belongs to different contactor surfaces 26 and 13 in contact group 1

Contactor node 2677 belongs to different contactor surfaces 26 and 13 in contact group 1

Contactor node 3528 belongs to different contactor surfaces 27 and 26 in contact group 1

Contactor node 2767 belongs to different contactor surfaces 28 and 14 in contact group 1

Contactor node 2755 belongs to different contactor surfaces 28 and 14 in contact group 1


Contactor node 3527 belongs to different contactor surfaces 28 and 27 in contact group 1

Contactor node 2603 belongs to different contactor surfaces 29 and 20 in contact group 1

Contactor node 2878 belongs to different contactor surfaces 30 and 21 in contact group 1

Contactor node 3439 belongs to different contactor surfaces 30 and 29 in contact group 1

Contactor node 3447 belongs to different contactor surfaces 30 and 29 in contact group 1


Contactor node 2962 belongs to different contactor surfaces 31 and 15 in contact group 1

Contactor node 2974 belongs to different contactor surfaces 31 and 15 in contact group 1

Contactor node 3798 belongs to different contactor surfaces 32 and 31 in contact group 1

Contactor node 3064 belongs to different contactor surfaces 33 and 16 in contact group 1

Contactor node 3052 belongs to different contactor surfaces 33 and 16 in contact group 1


Contactor node 3797 belongs to different contactor surfaces 33 and 32 in contact group 1

Contactor node 2900 belongs to different contactor surfaces 34 and 22 in contact group 1

Contactor node 3175 belongs to different contactor surfaces 35 and 23 in contact group 1

Message limit reached - 22 messages has been suppressed.

cutefatfat

希望大家帮忙一下，我用这个软件来做毕业设计，只有短短的两个月时间，所以没能好好地搞懂其中的设置等问题。谢谢。
现在我面临只有5天时间要完成它的问题，希望大家帮帮忙
恳求

starbo

支架有限元模型网格划分有问题，是不连续的
而且单位分的太粗，至少得保证厚度有3个单元。

cutefatfat

由于老是出现 element too distorted, Jacobian determination not positive的警告，我觉得mesh是很头疼的事情，好像必须两个物件用一样的mesh尺寸和方式才行，然后我就把它们分得很疏，是否单元就不会扭曲？
还有对于contact surfaces的设置，也是不知道如何确定。例如，我把支架设置成rigid钢体面后，还能不能通过给内表面力，让它变形呢？
希望大家帮帮忙解答，非常感谢！！！