如上图所示，为一扭转弹簧，弹簧的建立需要2个节点，分别为上节点1，下节点2，在模拟时，我们将节点2固定，在节点1施加一弯矩Mxx，图中黑圆块为转动惯量，这样才是一个完整的扭转弹簧体系！
在建模中有很多注意事项，请看下面简单命令流及解释！
定义节点，共两个！
*NODE
1 0.000000000E+00 0.000000000E+00 0.000000000E+00 0 0
2 4.500000000E+03 0.000000000E+00 0.000000000E+00 0 0
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$ SECTION DEFINITIONS $
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截面定义，图中红1为指定扭转单元，对于我们常用的扭转弹簧，此关键字其它均为0，也就是不考虑复杂的力与速度的关系！
*SECTION_DISCRETE
1 1 0.0000 0.0000 0.0000 0.0000
0.00 0.00
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ MATERIAL DEFINITIONS $
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定义材料，本例为弹性，实际可以选很多，都是S01~S0*
*MAT_SPRING_ELASTIC
1 0.741E+09
$ PARTS DEFINITIONS $
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$
定义part
*PART
Part 1 for Mat 1 and Elem Type 1
1 1 1 0 0 0 0
$
$
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$ ELEMENT DEFINITIONS $
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定义扭转单元，由1与2节点建立
本帖隐藏的内容
*ELEMENT_DISCRETE
1
1 1
2 0 0.000000000E+00 0
0.000000000E+00
定义节点转动惯量，这里特别说明，I值共6个，要求惯性张量矩阵必须是正定的，此模型简单，给出三个对角阵上的值，已满足！最后面一个值是节点质量，此值在计算中用
不到（因本例仅有扭矩），但必须定义。本关键定是给节点1定义相关值！
*ELEMENT_inertia
2 1
0
5e5
5e5
5e5 2.32E+15 质量
本关键定是给节点2定义相关值，由于节点2已固定，此值在计算中不起任何作用，但是在操作中必须定义，以使体系完整，否则会报错！
*ELEMENT_inertia
2 2
0
5e9
5e5
5e9
2.32E+15
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ LOAD DEFINITIONS $
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定义荷载，施加弯矩Mxx，红色5是弯矩
*DEFINE_CURVE
1 0 1.000 1.000 0.000 0.000
0.000000000000E+00 1.000000000000E+08
7.028000000000E+00 0.000000000000E+00
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000
1
*LOAD_NODE_SET
1 5 1 1.000 0 0 0 0
$
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ BOUNDARY DEFINITIONS $
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定义约束！
*SET_NODE_LIST
2 0.000 0.000 0.000 0.000
2
*BOUNDARY_SPC_SET
2 0 1 1 1 1 1 1
$
$
Author: Taochun Yang
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