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In order to perform a buckling analysis, a special Linear Buckling study is used. This consists of a Stationary study step and a Linear Buckling study step. The stationary study step performs the stress analysis for the applied load whereas buckling study uses eigenvalue solver and computes the critical load factors for the applied load.
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In order to run the analysis for various layered materials and compare the results, all the layered materials can be defined using a Switch node in Global Materials. This Switch node can be selected in the Layered Material Link node and a Material Sweep node is added in the study.
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Modeling a composite laminated shell requires a surface geometry (2D), in general called a base surface, and a Layered Material node which adds an extra dimension (1D) to the base surface geometry in the surface normal direction. You can use the Layered Material functionality to model several layers stacked on top of each other having different thicknesses, material properties, and fiber orientations. You can also optionally specify the interface materials between the layers and control mesh elements in each layer.
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From a constitutive model point of view, you can either use the Layerwise (LW) theory based Layered Shell interface, or the Equivalent Single Layer (ESL) theory based Layered Linear Elastic Material node in the Shell interface. These interfaces are used in order to apply various loads and constraints on different layers of a composite shell, and to solve for stresses and other relevant variables in each layer of the composite shell.
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The laminated composite shell presented in the current model is modeled using a Layered Linear Elastic Material node in the Shell Interface.
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Click Add.
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Click Study.
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Click Done.
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In the Model Builder window, under Component 1 (comp1) right-click Definitions and choose Variables.
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Browse to the model’s Application Libraries folder and double-click the file composite_cylinder_buckling_material.mph.
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Click Done.
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In the Settings window for Layered Material, type Layered Material: [90/90/45/-45]_s in the Label text field.
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Find the Layer Definition section and change the rotation angles in the Rotation column as summarized in the table below.
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Locate the Layer Definition section. Click Layer Stack Preview in the upper-right corner of the section.
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In the Settings window for Layered Material, type Layered Material: [90/0/90/0]_s in the Label text field.
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Find the Layer Definition section and change the rotation angles in the Rotation column as summarized in the table below.
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Locate the Layer Definition section. Click Layer Stack Preview in the upper-right corner of the section.
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In the Settings window for Layered Material, type Layered Material: [45/45/45/45]_as in the Label text field.
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Find the Layer Definition section and change the rotation angles in the Rotation column as summarized in the table below.
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Locate the Layer Definition section. Click Layer Stack Preview in the upper-right corner of the section.
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In the Model Builder window, under Component 1 (comp1) right-click Shell (shell) and choose Material Models>Layered Linear Elastic Material.
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In the Settings window for Prescribed Displacement/Rotation, locate the Prescribed Displacement section.
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Click Add.
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Clear the Description check box.
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Clear the Type check box.
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In the Settings window for 3D Plot Group, type Mode Shape: [90/90/45/-45]_s in the Label text field.
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Locate the Data section. From the Material Switch 1 list, choose Layered Material: [90/90/45/-45]_s.
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In the Settings window for 3D Plot Group, type Mode Shape: [45/45/45/45]_as in the Label text field.
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Locate the Data section. From the Material Switch 1 list, choose Layered Material: [45/45/45/45]_as.
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Select the Description check box.
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Select the Unit check box.
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In the Model Builder window, under Results>Mode Shape: Comparison right-click Surface 1 and choose Duplicate.
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In the Model Builder window, under Results>Mode Shape: Comparison right-click Surface 2 and choose Duplicate.
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In the Model Builder window, under Results>Mode Shape: Comparison right-click Surface 3 and choose Duplicate.
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