abaqus中实体单元的内力提取方法汇总

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.

Generating tabular data reports for subsets of the model

Tabular output data were generated earlier for this model using printed output requests. However, for

complicated models it is convenient to write these data for selected regions of the model using

Abaqus/Viewer. This is achieved using display groups in conjunction with the report generation

feature. For the connecting lug problem we will generate the following tabular data reports:

Stresses in the elements at the built- in end of the lug (to determine the maximum stress in the

lug)

?

Reaction forces at the built-in end of the lug (to check that the reaction forces at the constraints

balance the applied loads)

?

Vertical displacements at the bottom of the hole (to determine the deflection of the lug when the

load is applied)

?

Each of these reports will be generated using display groups whose contents are selected in the

viewport. Thus, begin by creating and saving display groups for each region of interest.

To create and save a display group containing the elements at the built-in end:

1.

2.

3.

4.

In the Results Tree, double-click

Display Groups

.

Choose

Elements

from the

Item

list and

Pick from viewport

as the selection method.

Restore the option to select entities closest to the screen.

In the prompt area, set the selection method to

by angle

; and click the built-in face of the lug.

Click

Done

when all the elements at the built-in face of the lug are highlighted in the viewport.

In the

Create Display Group

dialog box, click

Replace

display group as

built-in elements

.

followed by

Save As

. Save the

To create and save a display group containing the nodes at the built-in end:

1.

In the

Create Display Group

dialog box, choose

Nodes

from the

Item

list and

Pick from

viewport

as the selection method.

2.

In the prompt area, set the selection method to

by angle

; and click the built-in face of the lug.

Click

Done

when all the nodes on the built-in face of the lug are highlighted in the viewport. In

the

Create Display Group

dialog box, click

Replace

display group as

built-in nodes

.

To create and save a display group containing the nodes at the bottom of the hole:

1.

In the

Create Display Group

dialog box, select

All

from the item list, and click

Replace

to

followed by

Save As

. Save the

reset the active display group to include the entire model.

2.

In the

Create Display Group

dialog box, choose

Nodes

from the

Item

list and

Pick from

viewport

as the selection method.

3.

In the prompt area, set the selection method to

individually

; and select the nodes at the

bottom of the hole in the lug, as indicated in

Figure 4

–

35

. Click

Done

when all the nodes on the

bottom of the hole are highlighted in the viewport. In the

Create Display Group

dialog box,

click

Replace

followed by

Save As

. Save the display group as

nodes at hole bottom

.

Figure 4

–

35

Nodes in display group

nodes at hole bottom

.

Now generate the reports.

To generate field data reports:

1.

In the Results Tree, click mouse button 3 on

built-in elements

underneath the

Display

Groups

container. In the menu that appears, select

Plot

to make it the current display group.

2.

From the main menu bar, select

Report

Field Output

.

3.

In the

Variable

tabbed page of the

Report Field Output

dialog box, accept the default position

labeled

Integration Point

. Click the triangle next to

S: Stress components

to expand the list of

available variables. From this list, select

Mises

and the six individual stress

components:

S11

,

S22

,

S33

,

S12

,

S13

, and

S23

.

4.

In the

Setup

tabbed page, name the report

. In the

Data

region at the bottom of the

page, toggle off

Column totals

.

5.

Click

Apply

.

6.

In the Results Tree, click mouse button 3 on

built-in nodes

underneath the

Display

Groups

container. In the menu that appears, select

Plot

to make it the current display group.

(To see the nodes, toggle on

Show node symbols

in the

Common Plot Options

dialog box.)

7.

In the

Variable

tabbed page of the

Report Field Output

dialog box, change the position

to

Unique Nodal

. Toggle off

S: Stress components

, and select

RF1

,

RF2

, and

RF3

from the

list of available

RF: Reaction force

variables.

8.

In the

Data

region at the bottom of the

Setup

tabbed page, toggle on

Column totals

.

9.

Click

Apply

.

10.

In the Results Tree, click mouse button 3 on

nodes at hole bottom

underneath the

Display

Groups

container. In the menu that appears, select

Plot

to make it the current display group.

11.

In the

Variable

tabbed page of the

Report Field Output

dialog box, toggle off

RF: Reaction

force

, and select

U2

from the list of available

U: Spatial displacement

variables.

12.

In the

Data

region at the bottom of the

Setup

tabbed page, toggle off

Column totals

.

13.

Click

OK

.

Open the file

in a text editor. A portion of the table of element stresses is shown below. The

element data are given at the element integration points. The integration point associated with a given

element is noted under the column labeled

Int

Pt

. The bottom of the table contains information on the

maximum and minimum stress values in this group of elements. The results indicate that the

maximum Mises stress at the built-in end is approximately 330 MPa. Your results may differ slightly if

your mesh is not identical to the one used here.

*SECTION PRINT

Define print requests of accumulated quantities on user-defined surface sections.

This option is used to provide tabular output of accumulated quantities associated with a user-defined

section. Depending on the analysis type the output may include one or several of the following: the

total force, the total moment, the total heat flux, the total current, the total mass flow, or the total pore

fluid volume flux associated with the section. This option is not available for eigenfrequency extraction,

eigenvalue buckling prediction, complex eigenfrequency extraction, or linear dynamics procedures.

Product:

Abaqus/Standard

Type:

History data

Level:

Step

References:

“

Output to the data and results files,

”

Section 4.1.2 of the Abaqus Analysis User's Manual

?

“

Abaqus/Standard output variable identifiers,

”

Section 4.2.1 of the Abaqus Analysis User's

Manual

?

Required parameters:

NAME

Set this parameter equal to a label that will be used to identify the output for the section. Section

names in the same input file must be unique.

SURFACE

Set this parameter equal to the name used in the

*SURFACE

option to define the surface.

Optional parameters:

AXES

Set AXES=LOCAL if output is desired in the local coordinate system. Set AXES=GLOBAL (default) to

output quantities in the global coordinate system.

FREQUENCY

Set this parameter equal to the output frequency, in increments. The output will always be printed at

the last increment of each step unlessFREQUENCY=0. The default is FREQUENCY=1.

Set FREQUENCY=0 to suppress the output.

UPDATE

Set UPDATE=NO if output is desired in the original local system of coordinates.

Set UPDATE=YES (default) to output quantities in a local system of coordinates that rotates with the

average rigid body motion of the surface section. This parameter is relevant only ifAXES=LOCAL and

the NLGEOM parameter is active in the step.

Optional data lines:

First line:

1.

2.

3.

4.

Node number of the anchor point (blank if coordinates given).

First coordinate of the anchor point (ignored if node number given).

Second coordinate of the anchor point (ignored if node number given).

Third coordinate of the anchor point (for three-dimensional cases only; ignored if node number

given).

Leave this line blank to allow Abaqus to define the anchor point.

Second line:

1.

Node number used to specify point

a

in

Figure 18.5

–

1

(blank if coordinates given).

2.

First coordinate of point

a

(ignored if node number given).

3.

Second coordinate of point

a

(ignored if node number given).

The remaining data items are relevant only for three-dimensional cases.

4.

5.

6.

7.

8.

Third coordinate of point

a

(ignored if node number given).

Node number used to specify point

b

(blank if coordinates given)

First coordinate of point

b

(ignored if node number given).

Second coordinate of point

b

(ignored if node number given).

Third coordinate of point

b

(ignored if node number given).

Leave this line blank to allow Abaqus to define the axes.

Third line:

1.

Give the identifying keys for the variables to be output. The keys are defined in the “Section

variables” section of

“

Abaqus/Standard output variable identifiers,

”

Section 4.2.1 of the Abaqus

Analysis User's Manual

.

Omit both the first and second data lines for AXES=GLOBAL or to allow Abaqus to define the anchor

point and the axes for AXES=LOCAL. Repeat the third data line as often as necessary: each line

defines a table. If this line is omitted, all appropriate variables (

“

Output to the data and results

files,

”

Section 4.1.2 of the Abaqus Analysis User's Manual

) will be output.