abaqus中实体单元的内力提取方法汇总

实体单元建的模型，要提取截面的内力有什么好方法呢？

我看过别人的一个帖：

对于一般的实体单元结构

可以定义surface 然后用section file 输出

其中，这个surface可以在cae中定义，也可以在inp中定义，但是由于涉及到边的编号问题，所以在inp中容易出错。section file 的结果直接在dat中可见。需要编制小程序将其数据提取。

一定要编个程序才可以提取吗在dat文件里没有找到什么

section file是输出在*.fil文件中。要直接得到截面的total force，moment，heat flux可以在inp中添加：

*SECTION PRINT,name=*,surface=**

SOF,SOM

在dat文件中可以找到总内力和弯矩

我做钢筋混凝土的问题，模型分为两个part，分别是钢筋和混凝土，然后Assembe在一起，将钢筋embeded到混凝土内。我在keywords编辑器End assemble前定义

*surface, type=cutting surface,name=surface_1

-21.5,0,0,1,0,0

怎么也不成，总说定义的截面没有相交(坐标计算没有错误)。第三行空着（帮助文档说表示截断整个模型）也不行，写上钢筋或混凝土的单元组名（没有另建组，直接用的keywords编辑器中钢筋或混凝土生成单元的组名）也不行。请问是怎么回事？哪位有相关的例子给我一个，我的QQ：40735053。还望不吝赐教，谢谢。

Displaying a free body cut

You can define a free body cut to view the resultant forces and moments transmitted across a selected surface of a model. Force vectors are displayed with a single arrowhead and moment vectors with a double arrowhead.

To create a free body cut:

1. To display the entire model in the viewport, select Tools Display Group Plot All from

the main menu bar.

2. From the main menu bar, select Tools Free Body Cut Manager.

3. Click Create in the Free Body Cut Manager.

4. From the dialog box that appears, select 3D element faces as the Selection method and

click Continue.

5. In the Free Body Cross-Section dialog box, select Surfaces as the Item and Pick from

viewport as the Method.

6. In the prompt area, set the selection method to by angle and accept the default angle.

7. Select the surface, highlighted in Figure 4–33, to define the free body cut cross-section.

a. From the Selection toolbar, toggle off the Select the Entity Closest to the

Screen tool and ensure that the Select From All Entities tool is selected.

b. As you move the cursor in the viewport, Abaqus/CAE highlights all of the potential

selections and adds ellipsis marks (...) next to the cursor arrow to indicate an ambiguous

selection. Position the cursor so that one of the faces of the desired surface is

highlighted, and click to display the first surface selection.

Figure 4–33 Selected faces for the free body cross-section.

c. Use the Next and Previous buttons to cycle through the possible selections until the

appropriate vertical surface is highlighted, and click OK.

8. Click Done in the prompt area to indicate your selection is complete. Click OK in the Free

Body Cross-Section dialog box.

9. In the Edit Free Body Cut dialog box, accept the default settings for the Summation

Point and the Component Resolution. Click OK to close the dialog box.

10. Click Options in the Free Body Cut Manager.

11. From the Free Body Plot Options dialog box, select the Force tab in the Color &

Style tabbed page. Click the resultant color sample to change the color of the resultant force arrow.

12. Once you have selected a new color for the resultant force arrow, click OK in the Free Body

Plot Options dialog box and click Dismiss in the Free Body Cut Manager.

The free body cut is displayed in the viewport, as shown in Figure 4–34.

Figure 4–34 Free body cut displayed on the connecting lug.