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[后处理] abaqus中输出实体单元弯矩时,不同计算点对结果影响很大

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发表于 2016-3-17 01:35:21 | 显示全部楼层 |阅读模式 来自 广东广州
本帖最后由 hth0615 于 2016-3-17 01:36 编辑

在abaqus中,利用free body cut输出桩身弯矩,并且用slice选项同时切出多个平面(22米桩0.5米种子切45个面)。最后用report---free body cut输出rpy文件。
但是在slice选项(如图所示)中,根据不同选项出来的弯矩大小及方向均不同,不知道是什么原因,手册上没看明白。手册链接
本文已定义桩的中心轴线节点为Path-1

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  • 当选择step through the active view cut's range,弯矩图为:

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  • 当仅仅选择step along the pre-defined path,并不选择Set free body summation point on the path 时(display slice选项几乎无影响),弯矩图为:


可以看出,step through the active view cut's range与仅仅选择step along the pre-defined path的差异仅仅在于弯矩的正负号的差异。
但是到底哪个才是弯矩的正确方向??
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  • 选择step along the pre-defined path,选择Set free body summation point on the path 。

可以看出弯矩的大小发生了显著的变化。但是到底哪个才是弯矩的真实大小??
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以下是excel做出的对比图,Mx弯矩以及Fy剪力图

可以看出是否选择Set free body summation point on the path对弯矩的影响很大,可是研究时到底是看哪一个弯矩呢?
希望有高手能解答,不胜感激!


附:帮助文档对选项的说明,没看懂- -#
  • If you want to display view cut slices along the entire range of the view cut, select Step through the active view cut's range. If you display view cut slices or free body cuts in multiple locations for the selected view cut, you can also customize the minimum and maximum values of the line segment within which Abaqus/CAE will display the resultant forces and moments. By default, the minimum and maximum values are set to allow for distribution of slices throughout the entire model.
  • If you want to display view cut slices along a predefined path, select Step along a predefined path, then do the following:
    • Select the path.
    • Specify the locations where you want to display view cut slices using the Display slices at path nodes option:
      • Toggle on this option to place the view cut slices at the nodes that comprise the path definition.
      • Toggle off this option to place the view cut slices at a number of regular intervals along the path. Specify the number of slices from the field and slider at the bottom of the dialog box.
    • Specify the location of the summation point for the resultant forces and moments using the Set free body summation point on the path option:
      • Toggle on this option to place the summation point for the resultant forces and moments on the selected path.
      • Toggle off this option to place the summation point for the resultant forces and moments at the location about which resultant moments are taken.






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发表于 2016-3-17 08:16:00 | 显示全部楼层 来自 江苏苏州
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本帖最后由 leizhimeng 于 2016-3-17 08:17 编辑

inp关键字,截图贴上来看看呗。
PS:云图,很漂亮。
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 楼主| 发表于 2016-3-17 14:37:58 | 显示全部楼层 来自 广东广州
leizhimeng 发表于 2016-3-17 08:16
inp关键字,截图贴上来看看呗。
PS:云图,很漂亮。

没有使用关键字~
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发表于 2016-3-25 20:44:07 | 显示全部楼层 来自 福建
哎  无语了  
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发表于 2017-9-21 09:37:23 | 显示全部楼层 来自 江苏苏州
推荐楼主,这里面讲的比较清楚呢,个人觉得
http://forum.simwe.com/forum.php ... B%E5%BC%AF%E7%9F%A9
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