一个warning,请教
我在做接触，3D
开始选了xyz三个translation自由度
结果40步只走了13步
于是我吧所有的自由度都选上，
40步走了30步
但是出现了警告：
*WARNING: No element connection for node 1 directions 4, 5, 6
No element connection for node 2 directions 4, 5, 6
No element connection for node 3 directions 4, 5, 6
No element connection for node 4 directions 4, 5, 6
No element connection for node 5 directions 4, 5, 6
No element connection for node 6 directions 4, 5, 6
No element connection for node 7 directions 4, 5, 6
No element connection for node 8 directions 4, 5, 6
No element connection for node 9 directions 4, 5, 6
No element connection for node 10 directions 4, 5, 6
No element connection for node 11 directions 4, 5, 6
No element connection for node 12 directions 4, 5, 6
No element connection for node 13 directions 4, 5, 6
No element connection for node 14 directions 4, 5, 6
No element connection for node 15 directions 4, 5, 6
No element connection for node 16 directions 4, 5, 6
No element connection for node 17 directions 4, 5, 6
No element connection for node 18 directions 4, 5, 6
No element connection for node 19 directions 4, 5, 6
No element connection for node 20 directions 4, 5, 6
No element connection for node 21 directions 4, 5, 6
No element connection for node 22 directions 4, 5, 6
No element connection for node 23 directions 4, 5, 6
No element connection for node 24 directions 4, 5, 6
No element connection for node 25 directions 4, 5, 6
No element connection for node 26 directions 4, 5, 6
No element connection for node 27 directions 4, 5, 6
No element connection for node 28 directions 4, 5, 6
No element connection for node 29 directions 4, 5, 6
No element connection for node 30 directions 4, 5, 6
No element connection for node 31 directions 4, 5, 6
No element connection for node 32 directions 4, 5, 6
No element connection for node 33 directions 4, 5, 6
No element connection for node 34 directions 4, 5, 6
No element connection for node 35 directions 4, 5, 6
No element connection for node 36 directions 4, 5, 6
No element connection for node 37 directions 4, 5, 6
No element connection for node 38 directions 4, 5, 6
No element connection for node 39 directions 4, 5, 6
No element connection for node 40 directions 4, 5, 6
No element connection for node 41 directions 4, 5, 6
No element connection for node 42 directions 4, 5, 6
No element connection for node 43 directions 4, 5, 6
No element connection for node 44 directions 4, 5, 6
No element connection for node 45 directions 4, 5, 6
No element connection for node 46 directions 4, 5, 6
No element connection for node 47 directions 4, 5, 6
No element connection for node 48 directions 4, 5, 6
No element connection for node 49 directions 4, 5, 6
No element connection for node 50 directions 4, 5, 6
Message limit reached - above message has been suppressed 27388 times.
Nodal degrees of freedom without element
connection have been fixed for data input file.
There may still be degrees of freedom without
stiffness - see documentation.
请问这对结果会有影响吗？ 看你使用的是什么单元，单元的自由度与你所打开的自由度是否相符。 这种警告很常见，有时并不影响计算。
不要认为有限元让他算多少步它就会算多少步，这与多方面的因素有关，比如说软件使用者的经验，模型是否合理等，有些情况不收敛就是正确的结果。
当然接触问题一般算不完是模型本身的原因。 3# wild_field
我没设接触是，模型很快算完
加了接触后，到最后就会不收敛，
是接触的原因？
还是体的原因，？
如果重新划分网格，
桩网格细化可以吗？？ 我把土体材料该给弹性，会比mc，收敛好些吗？ 本帖最后由 wild_field 于 2009-10-14 11:06 编辑
这说明不收敛是由接触造成的，但为什么不收敛，需要你自己想办法解决，有可能是时间步太大，时间函数不合理——加载太快等原因促成。
弹性材料当然比mc要好收敛的多。 我设过ATS,而且我原来设的时间步就是40*0.25，
我现在就是没什么办法，只好在这细化了下网格。 maybe you can open low-speed dynamics, or open line search, or both. master degree 限制xyz的转动
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