A GUIDE TO DEVELOP FEA MODEL. 2D Model (Shell Element) In LS-DYNA
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1 A GUIDE TO DEVELOP FEA MODEL 2D Model (Shell Element) In LS-DYNA By Dr. Rakhmad Arief Siregar CAED Lab. Mechanical Eng. Program Universiti Malaysia Perlis Problem 1:
2 Preprocessing by LS-PREPOST Drawing Curves and Mesh in 2Dmesh Go page 7: 2DMesh Click Sketch, see Fig. 1(a) In this menu you may draw your model. Draw a rectangular plate with hole as shown in Fig. 1(c) Click on Line icon and click on KeyIn Enter x1: 0 Enter y1: 0 Enter x2: 50 Enter y2: 0 Click Create Enter x1: 50 Enter y1: 0 Enter x2: 50 Enter y2: 50 Click Create Enter x1: 50 Enter y1: 50 Enter x2: 0 Enter y2: 50 Click Create Enter x1: 0 Enter y1: 50 Enter x2: 0 Fig. 1(b) Sketch menu Enter y2: 0 Click Create Click on Circle icon and click on KeyIn Enter x1: 25 Enter y1: 25 Click on Radius icon Click Create Enter : 10 Click Exit Click Acen for auto center the model Fig. 1(a) 2DMesh To create Edge of mesh Click Edge icon Click Create in radio button of Edges Activate propag option Click on upper line, left line, lower line and right line Click on Create icon Click on circle and click on Create icon Fig. 1(c) Mesh
3 To assign number elements Click No.ele/edge in radio button of Edges Enter No. : 40 Click on any line of the rectangular line Click on Create Enter No. : 40 Click on circle Click on Create To free quad mesh of the model Click Mesh icon Click Free Quad Mesh icon (the first from the left) Activate propag and interior hole options Click on any edges of the rectangular line Click on circle Click on Mesh with holes Click Exit Click Acen for auto center the model Click Mesh to see the result as shown Fig. 1(d) Fig. 1(d) Complete Mesh
4 2. Define Material Properties of Shell elements Go page 3: *Mat Choose Groupby: Shell, see Fig. 2(a) Click 001-ELASTIC Click Edit, will generate new menu, see Fig. 3(b) Enter Title: Steel Plate Enter RO: 7.85E-9 Enter E: 210E+3 Enter RO: 0.33 Fig. 2(a) *Mat Fig. 2(b) Material Properties
5 3. Define Geometry Properties of Shell elements Go page 3: *Section Click SHELL, see Fig. 3(a) Click Edit, will generate new menu, see Fig. 3(b) Enter Title: Plate 2D Choose ELFORM: 12 for Plane Stress Enter T1: 5 for the thickness of the plate and leave the rest as shown in Fig. 4(b) Fig. 3(a) *Section Fig. 3(a) Section beam
6 4. Assigning Material and Geometry Properties to the Part Go page 3: *Part Click [*]PART (1), see Fig. 4(a) Click Edit, will generate new menu, see Fig. 4(b) Enter Title: Plate Part Enter SECID: 1 (Assigning geometry property) Enter MID: 1 (Assigning material property) Fig. 4(a) *Part Fig. 4(b) Part
7 5. Boundary Conditions Go page 5: Spc Click Create, Click Set, Click the radio button at Y, Z, RX, RY, RZ, see Fig. 6(a) Leave X unchecked so that the model is free in x translation Click node 1 in your model, which is the far left side of the model Click on Area and In at the selection radio button see Fig. 5(b) Make a rectangle area at the top of the model, so that all the top edge nodes are covered Do it one more time for the buttom edge of the model, see Fig. 6(c) Click Apply Fig. 5(a) Spc Fig. 5(b) Selection radio button Fig. 5(c) Top and bottom edge nodes are selected
8 6. Define Curve for Load Go page 3: *Define, see Fig. 6(a) Click Curve, Click Edit, will generate new menu, see Fig. 6(b) Enter Title: Plate Load Enter A1: 0.0 Enter O1: 0.0 Click Insert Enter A1: 0.5 Enter O1: 10 Click Insert Click Plot, see Fig. 6(c) Click Close at plot menu Fig. 6(c) Plot result Fig. 6(a) *Define Fig. 6(b) *Define curve
9 7. Define Set ID for Load Go page 5: SetD, see Fig. 7(a) Click Create, Click *SET_NODE Enter Title: Right node Use selection radio buttion as in Fig. 7(b) Fig. 7(b) Selection radio button Make a rectangle area at the right of the model, so that all the right edge nodes are covered, see Fig. 7(c) Enter Title: Left node Make a rectangle area at the left of the model, so that all the left edge nodes are covered, see Fig. 7(c) Fig. 7(a) *SetD Fig. 7(c) Right and left edge nodes are selected
10 8. Define the Load Go page 3: *Load, see Fig. 8(a) Click NODE_SET, Click Edit, will generate new menu, see Fig. 8(b) Click dot icon of NSID choose right node setid Choose 1 for DOF, so that the load is working on X-direction Click dot icon of LCID choose plate load load curve Click dot icon of NSID choose left node setid Choose 1 for DOF, so that the load is working on X-direction Click dot icon of LCID choose plate load load curve Enter SF: - 1, so that the load is working to the left side Fig. 8(a) *Load Fig. 8(b) Load node
11 9. Define Database card Go page 3: *DBase, see Fig. 9(a) Click BINARY_D3PLOT, Click Edit, will generate new menu, see Fig. 9(b) Enter DT: 0.1 Fig. 9(a) *DBase Fig. 9(b) *Database Binary D3plot 10. Define Control card Go page 3: *Control, see Fig. 10(a) Click TERMINATION, Click Edit, will generate new menu, see Fig. 10(b) Enter ENDTIM: 0.5 Fig. 10(a) *Control Fig. 10(a) *Control Termination
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