In this problem, we will try to show how to analyze the local-global fields in composite structures using SwiftComp-Abaqus-GUI. [[BR]] The figure below can summarize how to do the local global analysis.[[BR]] [[Image(Problem-4A.jpg)]][[BR]] Let the material properties a fiber (T300) property be: : E,,11,,=230 GPA, E,,22,,=15 GPA, v,,12,,=0.20, v23=,,0.0714,,, G,,12,,=15GPa, G,,7,,=3.928GPa.[[BR]] and matrix (3501-6 epoxy) be: E =4.2GP, ν=0.34[[BR]] The composite lay-up: {{{ [0/90/45],,s,, }}}[[BR]] Thickness of each ply=0.00025m[[BR]] “Soden, P. D., Hinton M. J. and Kaddour, A. S., Lamina properties, lay-up configurations and loading conditions for a range of fibre reinforced composite laminates. Compos. Sci. Technol., 1998, 58(7), 1011”[[BR]] Major steps to perform local-global analysis[[BR]] '''Step 1: Input material properties'''[[BR]] There are two materials namely fiber and matrix [[BR]] a. Fiber properties[[BR]] b. Matrix properties[[BR]] [[Image(Problem-4mat.jpg)]][[BR]] [[Image(Problem-4mat2.jpg)]][[BR]] '''Step 2: Select appropriate SG''' [[BR]] a. Select 3D SG that represent the current example[[BR]] [[Image(Problem-2c.jpg)]][[BR]] b. 3D SG wizard shows up[[BR]] c. Select spherical inclusion as microstructure[[BR]] d. Add inclusion volume fraction[[BR]] e. Select material properties for inclusion and matrix[[BR]] f. Click on OK to generate the SG[[BR]] g. See generated 2D SG[[BR]] [[Image(Problem-4AA.jpg)]] [[Image(Problem-4bb.JPG)]][[BR]] '''Step 3- Homogenization- 3D effective properties''' [[BR]] a. Click on Homogenization [[BR]] [[Image(problem-1E.JPG)]] [[BR]] b. Homogenization wizard shows up ( see below) [[BR]] c. Select 3D (solid) Model[[BR]] d. Select analysis type, elastic[[BR]] e. Click on OK to start homogenization[[BR]] f. See the predicted 3D effective properties[[BR]] [[Image(problem-1H.JPG)]] [[Image(problem-4I.JPG)]][[BR]] '''Step 4: Export predicted effective properties to create a new model'''[[BR]] a. Export the predicted effective properties [[BR]] [[Image(Problem-4R.jpg)]][[BR]] b. A new model is automatically generated, this is to be used for generating a global model[[BR]] c. Predicted effective properties exported as engineering constants [[BR]] d. Predicted effective properties exported as stiffness matrix, D, [[BR]] [[Image(Problem-4M1.jpg)]] [[BR]] '''Step 5: Generate the global model'''[[BR]] a. Click on Part and name as Part-1 [[BR]] b. Select 'Shell' from from Shape and 'Planer' from type [[BR]] c. A new model is generated as shown ( 0.2m and thickness=0.15m) [[BR]] [[Image(Problem-4M2.jpg)]] [[BR]] [[Image(Problem-4M3.jpg)]] [[BR]] ''Step 6: Create and Assign Section'''[[BR]] a. Click on Section and name as 'Composite' [[BR]] b. Select 'Shell' from from Category and 'Composite' from type [[BR]] c. Edit section wizard shows up [[BR]] d. Add section properties as shown and click OK [[BR]] [[Image(Problem-4M4.jpg)]] [[BR]] [[Image(Problem-4M5.jpg)]] [[BR]] e. Assign material orientation [[BR]] f. Click on Axis 3 [[BR]] [[Image(Problem-4M6.jpg)]] [[BR]] ''Step 7: Create Assembly and Steps '''[[BR]] a. Select Assembly [[BR]] b. Select 'Part-1' from Create Instance [[BR]] c. Click OK [[BR]] [[Image(Problem-4M7.jpg)]] [[BR]] e. Create steps, accept the default setting [[BR]] [[Image(Problem-4M8.jpg)]] [[BR]] ''Step 8: Create load and boundary conditions '''[[BR]] a. Select load from Module [[BR]] b. Select load [[BR]] c. Name the load as 'Load-1' [[BR]] d. Select step 1 [[BR]] e. Select pressure [[BR]] [[Image(Problem-4M9b.jpg)]] [[BR]] [[Image(Problem-4M9a.jpg)]] [[BR]] f. Select the area to be loaded [[BR]] g. Add the load [[BR]] youtube link:[[BR]] ''Step 9: Create boundary conditions '''[[BR]] a. Select load from Module [[BR]] b. Boundary Conditions (BC) [[BR]] c. Name the BC as 'BC-1' and Select 'Step-1'[[BR]] d. Select 'Mechanical' from Category and Symmetry type BC[[BR]] e. Click on OK [[BR]] [[Image(Problem-4M10a.jpg)]] [[BR]] f. Select the edge for BC [[BR]] g. Select ENCASTER [[BR]] [[Image(Problem-4M10.jpg)]] [[BR]] ''Step 10: Create Mesh '''[[BR]] ''Step 11: Run the analysis '''[[BR]] ''Step 11: Results of the analysis '''[[BR]] [[Image(Problem-R1.jpg)]] [[BR]] ''Step 12: Obtain global strains '''[[BR]] a. Click on probe values to obtain global strain [[BR]] b. Click on a point on global structure [[BR]] c. Select nodes and all direct from probe values wizard [[BR]] d. The following strain values can be obtained, strain e,,11,,=-0.042709, e,,22,,=0.00212116, 2e,,12,,=0.00788458, and all others are zero [[BR]] ''Step 13: Run dehomogenization '''[[BR]] a. Go back to micromechanical analysis with hexagonal SG and click on dehomogenization [[BR]] [[Image(Problem-2Dh.jpg)]] [[BR]] b. Add global strain obtain in step 12 to obtain local field in 0 degree lamina [[BR]] C. Click on OK [[BR]] [[Image(Problem-Rd2.jpg)]] [[BR]] ''Step 14: Create view port and show both global and micromechanical local field analysis '''[[BR]] [[Image(Problem-RR1.jpg)]] [[BR]] [[Image(Problem-RR1.jpg)]] [[BR]]