Engineering Analysis with Ansys Software Episode 1 Part 10 potx

Then the window Library of Element Types, as shown in Figure 4.39, opens.. Click [D]OK button to close the window Library of Element Types.. Click [A]add button, and the window Element T

(a) (b)

(c)

Suspension

Spring Fixed area

8.3

1.5

1.2

es/press/fotos/.informaticapersonal/i/hdd.jpg); (b) drawing of the analyzed suspension; and (c) shell element

A

C o m m a n d ANSYS Main Menu → Preprocessor → Element Type → Add/Edit/Delete

Then the window Element Types, as shown in Figure 4.38, is opened.

(1) Click [A] add Then the window Library of Element Types, as shown in

Figure 4.39, opens

C

B

D

(2) Select [B] Shell in the table of Library of Element Types and, then, select [C]

Elastic 8node 93.

(3) Element type reference number is set to 1 Click [D]OK button to close the window Library of Element Types.

(4) Click [E] Close button in the window of Figure 4.40.

4.3.2.2 REAL CONSTANTS FOR BEAM ELEMENT

C o m m a n d ANSYS Main Menu → Preprocessor → Real Constants → Add/Edit/

(1) The window Real Constants opens (Figure 4.41) Click [A]add button, and the window Element Type for Real Constants appears in which the name of element

type selected is listed as shown in Figure 4.42

(2) Click [B] OK button to input the values of real constants and the window Real

Constant Set Number1, for Shell opens (Figure 4.43).

(3) Input the following values in Figure 4.43: [C] shell thickness at nodes I, J, K, and L= 0.05e−3 After inputting these values, click [D] OK button to close the

window

(4) Click [E] Close button in the window of Real Constants (Figure 4.44).

A

B

D

E

4.3.2.3 MATERIAL PROPERTIES

This section describes the procedure of defining the material properties of shell element

C o m m a n d ANSYS Main Menu → Preprocessor → Material Props → Material Models

(1) Click the above buttons in order and the window Define Material Model

Behavior, as shown in Figure 4.12, opens

(2) Double click the following terms in the window:

Then the window of Linear Isotropic Properties for Material Number 1 opens (3) Input Young’s modulus of 206e9 to [A] EX box and Poisson ratio of 0.3 to [B]

PRXY box Then click [C] OK button (Figure 4.45).

Next, define the value of density of material

(1) Double click the term Density and the window Density for Material Number 1

opens (Figure 4.46)

(2) Input the value of Density, 7800 to [D] DENS box and click [E] OK button (Figure 4.46) Finally close the window Define Material Model Behavior by clicking X mark at the upper right end.

4.3.2.4 CREATE KEYPOINTS

To draw a suspension for the analysis, the method of keypoints is described in this section

A

B

C

E

A

B

C o m m a n d ANSYS Main Menu → Preprocessor → Modeling → Create → Keypoints → In

Active CS

(1) The window Create Keypoints in Active Coordinate System opens (Figure 4.47) (2) Input [A] 0, −0.6e−3, 0 to X, Y, Z Location in active CS box, and then click [B] Apply button Do not click OK button at this stage If a figure is not inputted

into [C] NPT Key Point number box, the number of keypoint is automatically

assigned in order

(3) In the same window, input the values as shown in Table 4.1 in order When all

values are inputted, click OK button.

(4) Then all inputted keypoints appear on ANSYS Graphics window as shown in

Figure 4.48

Table 4.1 X, Y, and Z coordinates of keypoints for suspension

4.3.2.5 CREATE AREAS FOR SUSPENSION

Areas are created from keypoints by performing the following steps:

C o m m a n d ANSYS Main Menu → Preprocessor → Modeling → Create → Areas →

(1) The window Create Area thru KPs opens (Figure 4.49).

(2) Pick the keypoints, [A] 9, 10, 11, and 12 in Figure 4.50 in order and click [B]

Apply button in Figure 4.49 An area is created on the window as shown in

Figure 4.51

(3) By performing the same steps, other areas are made on the window Click key-points listed in Table 4.2 and make other areas When you make area No 3 and

4, you have to rotate the drawing of suspension, using

PlotCtrls—Pan-Zoom-Rotate in Utility Menu.

B C

A

Table 4.2 Keypoint numbers for making areas of a suspension

(4) When all areas are made on the window, click [C] OK button in Figure 4.49.

Then the drawing of the suspension in Figure 4.52 appears

C o m m a n d ANSYS Main Menu → Preprocessor → Modeling → Create → Areas → Circle →

Solid Circle

The window Solid Circle Area opens, Figure 4.53 Input [D]the values of 12.0e −3,

0, 0.6e−3 to X, Y and Radius boxes as shown in Figure 4.53, respectively, and click

[E] OK button Then the solid circle is made in the drawing of suspension as shown

in Figure 4.54

E

Areas.

A

4.3.2.6 BOOLEAN OPERATION

In order to make a spring region and the fixed region of the suspension, the rectangular and circular areas in the suspension are subtracted by Boolean operation

C o m m a n d ANSYS Main Menu → Preprocessor → Modeling → Operate → Booleans →

(1) The window Subtract Areas opens (Figure 4.55).

(2) Click [A] the area of the suspension in ANSYS Window and [B] OK button

in Figure 4.56 Then click [C] rectangular and [D] circular areas as shown in

Figure 4.57 and [B] OK button in Figure 4.54 The drawing of the suspension

appears as shown in Figure 4.58

(3) In analysis, all areas have to be glued

D C

C o m m a n d ANSYS Main Menu → Preprocessor → Modeling → Operate → Booleans →

The window Glue Areas opens (Figure 4.59) Click [E] Pick All button.

4.3.2.7 CREATE MESH IN AREAS

C o m m a n d ANSYS Main Menu → Preprocessor → Meshing → Size Cntrls → Manual Size →

The window Element Sizes on All Selected Areas opens (Figure 4.60).

(1) Input [A] 0.0002 to SIZE box This means that areas are divided by meshes of

edge length of 0.0002 m

(2) Click [B] OK button and close the window.

B

D

C

Figure 4.62 ANSYS Graphics window.

C o m m a n d ANSYS Main Menu → Preprocessor → Meshing → Mesh → Areas → Free

The window Mesh Areas opens (Figure 4.61).

(1) Click [C] Pick ALL and, then, [D] OK button to finish dividing the areas as shown

in Figure 4.62

4.3.2.8 BOUNDARY CONDITIONS

The suspension is fixed at the edge of the circle

C o m m a n d ANSYS Main Menu → Solution → Define Loads → Apply → Structural →

The window Apply U,ROT on Lines opens (Figure 4.63).

(1) Pick [A] four lines included in the circle in Figure 4.64 and click [B] OK button

in Figure 4.63 Then the window Apply U,ROT on Lines opens (Figure 4.65) (2) In order to set the boundary condition, select [C] All DOF in the box of Lab2 Input [D] 0 to the box of VALUE and, then, click [E] OK button After these steps, the ANSYS Graphics window is changed as shown in Figure 4.66.

A

D C

B

4.3.3.1 DEFINE THE TYPE OF ANALYSIS

The following steps are performed to define the type of analysis

C o m m a n d ANSYS Main Menu → Solution → Analysis Type → New Analysis

The window New Analysis opens (Figure 4.67).

(1) Check [A]Modal and, then, click [B]OK button.

In order to define the number of modes to extract, the following steps are performed

C o m m a n d ANSYS Main Menu → Solution → Analysis Type → Analysis Options

The window Modal Analysis opens (Figure 4.68).

(1) Check [C]Subspace of MODOPT and input [D] 10 in the box of No of modes

to extract and click [E] OK button.

(2) Then, the window Subspace Modal Analysis as shown in Figure 4.69 opens Input [F] 20000 in the box of FREQE and click [G] OK button.

4.3.3.2 EXECUTE CALCULATION

C o m m a n d ANSYS Main Menu → Solution → Solve → Current LS

D C

4.3.4.1 READ THE CALCULATED RESULTS OF THE FIRST MODE OF

VIBRATION

C o m m a n d ANSYS Main Menu → General Postproc → Read Results → First Set

4.3.4.2 PLOT THE CALCULATED RESULTS

C o m m a n d ANSYS Main Menu → General Postproc → Plot Results → Deformed Shape

The window Plot Deformed Shape opens (Figure 4.70).

(1) Select [A] Def +Undeformed and click [B] OK.