关于Massless nodes

kevin_zhu

*** Warning Massless nodes
             The following massless nodes were found
               node #     300000

*** Warning total number of massless nodes =       1

*** Error *** massless node #  300000 on the slave side of surface #         1 type # 4

*** Error *** massless node #  300000 on the slave side of surface #         2 type # 4

*** Error *** massless node #  300000 on the slave side of surface #         3 type # 4

The LS-DYNA time step size should not exceed     0.250E-18
to avoid contact instabilities.  If the step size is
bigger then scale the penalty of the offending surface.


*** Error initialization completed with       3 fatal errors
           please check messag file

E r r o r   t e r m i n a t i o n
模型里有弹簧单元，不知怎么回事

冰冷四季

同求该问题的解决方法？

yanhongtao66

也遇到相同的问题，*** Warning Massless nodes
             The following massless nodes were found
               node #      60001
               node #      70002
               node #      80003
*** Warning total number of massless nodes =       9
The LS-DYNA time step size should not exceed     0.358E-04
to avoid contact instabilities.  If the step size is
bigger then scale the penalty of the offending surface.
搜索论坛回答也不是很多，不知是时间步还是什么设置的不对，这是alphant的回答，在关键字手册中的：A node without an element or a mass attached to it will be assigned a very small amount of mass and rotary inertia. Generally, massless nodes should not cause any problems but in rare cases may create stability problems if these massless nodes interact with the structure. Warning messages are printed when massless nodes are found. Also, massless nodes are used with rigid bodies to place joints, see *CONSTRAINED_EXTRA_NODES_OPTION and *CONSTRAINED_ NODAL_RIGID_BODY.

三颗智齿

若是模型中使用了梁单元，这些可能是方向点，没有什么影响

chulinxi

冰冷四季 发表于 2013-10-30 10:48
同求该问题的解决方法？

不用理他，算你的就是了

翔鸿飞雀

三颗智齿 发表于 2010-12-24 16:13
若是模型中使用了梁单元，这些可能是方向点，没有什么影响

然而就这么一个警告，程序运行不下去，怎么解？

翔鸿飞雀

chulinxi 发表于 2013-11-7 02:11
不用理他，算你的就是了

算不下去，程序不跑，怎么解

zy1993

问题解决了吗？