Enter the email address you signed up with and we'll email you a reset link. Need an account? Click here to sign up. Download Free PDF. A short summary of this paper. Download Download PDF. Translate PDF. December 12, 16 Release You can switch between open tabs. December 12, 17 Release December 12, 18 Release December 12, 19 Release December 12, 20 Release December 12, 21 Release December 12, 22 Release December 12, 23 Release December 12, 24 Release December 12, 25 Release December 12, 26 Release The rectangles are stacked in appearance, with the topmost rectangle representing the visible selected geometry and subsequent rectangles representing additional geometry selections.
For this example, the topmost geometry is the "high" edge. Select the Edge selection filter and highlight an edge in the center of the model.
Using the Depth Picking tool, select the second rectangle in the stack, and then scope the edge as the geometry Apply in the Target property. Verify that Bonded is selected as the contact Type and that Pure Penalty is set as the Formu- lation. Rename the contact "Body". Define Mesh Options and Controls. Select the Mesh object. This mesh sizing control should be scoped to the four side edges. In the Details view, enter 0. Use the Depth Picking tool and, holding the Ctrl key, select both rectangles in the lower left corner of the graphics window.
Continue to hold the Ctrl key, and select an edge of the crack. Again, use the Depth Picking tool and select both rectangles in the lower left corner of the graphics window. Still holding the Ctrl key, select the top and bottom edges on the model. This mesh sizing control should be scoped to six top and bottom and the four interface edges edges.
Right-click the Mesh object and select Generate Mesh. Specify Contact Debonding object. Insert a Fracture folder into the tree by highlighting the Model object and then selecting the Fracture button on the Model Context Toolbar.
In the Details pane, set the Contact Region property to Body. The Contact Debonding object is complete. Select the Analysis Settings object. Apply boundary conditions. Select the Edge selection filter and select the two edges on the side of the model that is opposite of the crack. Select one edge, press the Ctrl key, and then select the next edge. Highlight the Static Structural object. With the Vertex selection filter active, select the vertex illustrated below, select the Supports menu and then select Displacement.
In the Details pane, enter 10 mm in the positive Y direction as the loading value for the Y Component property. Create another Displacement. Enter mm in the negative Y direction as the loading value for the Y Component property. Specify result objects and solve. Select Displacement for the Boundary Condition property of the probe. Review the results. Highlight the Directional Deformation and Force Reaction objects. Results appear as follows: Release You may wish to validate results against those outlined in the verification test case VM This is most easily accomplished by creating User Defined Results using the Worksheet.
Interface Delamination Analysis of Double Cantilever Beam Problem Description This tutorial demonstrates the use of Interface Delamination feature available in Mechanical by examining the displacement of two 2D parts on a double cantilever beam. This image illustrates the dimension of the model. This tutorial also examines how to prepare the necessary materials and mesh controls that work in co- operation with the Interface Delamination feature.
This analysis requires the creation of the proper materials using the Engineering Data feature of Workbench. We will define a new Orthotropic Elastic material for the model as well as a Cohesive Zone Bilinear material for the Interface Delamination feature. Click the box labeled "Click here to add new material" and enter the name "Interface Body Material".
This mater- ial will specify the formulation used to introduce the fracture mechanism Cohesive Zone Material method. The Project Schematic should appear as follows: Release Highlight the Geometry folder. Apply Material: Expand the Geometry folder and select the Part 2 folder. Set the Assignment property to "Interface Body Material". Selecting the Part 2 folder allows you to assign the material to both parts at the same time. Suppress Contact. Caution Contact cannot be present for this analysis.
Expand the Connections folder and then expand the Contacts folder. Right-click the Contact Region object and select Suppress. Define coordinate systems. This analysis requires a mesh Match Control property to match the elements of the two parts.
To properly define the Match Control property, you need to define coordinate systems for the element faces that will be matched with one another. In theory, for this model, one coordinate system could facilitate the specification of the Mesh Match Control because the coordinate systems you are about to create are virtually identical. Right-click the new coordinate system object, select Rename, and name the object "High Coordinate System.
In the Details pane of the newly-created Coordinate System object, select the Geometry property field Click to Change. This tutorial employs the Depth Picking tool because of the close proximity of the two edges involved in the interface, as well as the crack. The rectangles are stacked in appearance, with the topmost rectangle representing the visible selected geometry and subsequent rectangles rep- resenting additional geometry selections.
Click Apply in the Geometry property. The "High Coordinate System" is defined. Right-click the Coordinate Systems object again and insert another Coordinate System object.
Rename this object "Low Coordinate System. Using the Depth Picking tool, select the second rectangle in the stack, and then scope the edge as the geometry Apply in the Geometry property. This scoping is illustrated below. Activate the High Geometry Selection property by selecting its field that is highlighted in yellow.
The Apply and Cancel buttons display. Select the Edge selection tool and highlight one of the edges in the center of the model. Use the Depth Picking tool to select the topmost geometry. Click the Apply button. Perform the same steps to specify the Low Geometry Selection property, as illustrated below. Change the Transformation property from Cyclic to Arbitrary and specify the High Coordinate System and Low Coordinate System properties using the coordinate systems created in the previous step of the tutorial.
The object should appear as illustrated below. Select the Edge selection filter on the Graphics Toolbar and, holding the Ctrl key, select the four side edges. Define Interface Delamination object. Insert a Fracture folder into the tree by highlighting the Model object and selecting the Fracture button on the Model Context Toolbar. Select the Match Control that was created earlier in the tutorial for the Match Control property. The Interface Delamination object is complete.
In the Details pane, set the Large Deflection property to On to activate geometric nonlinearities. Define boundary conditions. With the Vertex selection filter active, select the vertex illustrated below, select the Supports menu, and then select Displacement.
Highlight the Displacement object in the tree and enter 10 mm in the positive Y direction as the loading value for the Y Component property. Select Displacement for the Boundary Condition property. Results appear as follows: You may wish to validate results against those outlined in the verification test case VM The crack is modeled at the geometry level and the appropriate mesh controls are already defined. The fracture parameters are post-processed using a J-Integral approach which supports plastic material behavior.
Procedure 1. Restore the project archive. Browse to open 2D Cracked Specimen. Save the project in the desired directory. Check the material properties in Engineering Data. The Engineering Data opens and displays the material windows. Click on Return to Project on the main toolbar to go back to the project schematic. Prepare the analysis in the Mechanical Application.
In the Static Structural schematic, right-click the Model cell, and then choose Edit. For convenience, use the Rotate and Zoom toolbar buttons to manipulate the model so it displays as shown below. Note Geometry and mesh controls have already been defined in the project. The geometry consists of two parts that represent the two different sides of the crack.
Create Mesh Connections. Select the Connections object in the Tree Outline. On the Graphics toolbar, select the Edge button to toggle Edge selection mode. In the Graphics window, select the edge in lower right-hand corner of the upper part. In the Details view, for Master Geometry, click Apply. In the Graphics window, select the corresponding edge belonging to the bottom part. In the Details view, for Slave Geometry, click Apply.
Repeat the last five steps two times to connect the edges couples that correspond to the regions where the mesh needs to be connected. Generate mesh.
Select the Mesh object in the Tree Outline. Note that some mesh controls are already defined in the model. Create a coordinate system. In the Details view, select Coordinate System. In the Graphics window, select the vertex in the middle of the left hand side of the structure. In the Details view, for Geometry, click Apply. Create nodal named selections. On the Graphics toolbar, select the Vertex button to toggle Vertex selection mode.
In the Graphics window, select the crack front extremity. In the Details pane, for Geometry, click Apply. The named selection is created for the selected vertex. Define the crack. For Coordinate System, select the coordinate system you previously defined. For Solution Contours, set the value to Leave the Suppressed value set to No. Apply loads. In the Tree Outline, select Static Structural. In the Graphics toolbar, select the Edge button. In the Graphics window, select the bottom edge.
Select the Y Component and select Tabular. In the Details view, change the Independent variable to X. In the first row 1 , for Y[mm], enter 0. In the second row 2 , for X[mm], enter 10 and for Y[mm], enter 0. In the Details view, change the X-Axis to Time. In the Tabular Data window, enter the evolution of scale against time: In the first row 1 , for Scale, enter 0.
In the Graphics window, select the vertex in the middle of the right hand side of the specimen. Select the X Component and select Tabular. In the Details view, set X Component to 0. Under Step Controls, note that substeps have already been defined because due to the plastic law the resolution will be nonlinear. Under Solver Controls, set Fracture to On.
Click Solve. Define J Integral results. View results. Select the Equivalent Plastic Strain Results. The plasticity is localized around the crack tip which is required for J-Integral calculation. View the Graph window and the tabular data for each result. The tabular data display the J-Integral results at the crack front node for each integration contour. Note that the results converge after several contour integrations.
J-Integral results start converging when the integration contour is outside the plastic zone. You have completed the fracture analysis and accomplished the overall objective for this tutorial. This problem uses an imported model, already meshed, and then computes fracture parameters energy release rates using the Virtual Crack Close Technique VCCT on a static structural analysis to determine the impact of a catastrophic failure to the structure.
Import the meshed model. Right-click the Model cell and select Properties to view the assembly mesh file you imported. Establish a static structural analysis.
Right-click the Model cell of the Static Structural system and select Refresh. Note that the mesh is composed of linear elements, and VCCT is only applicable to linear elements b. For convenience, use the Rotate toolbar button to manipulate the model so it displays as shown below. Create a nodal named selection. On the Graphics Options toolbar, select the Wireframe button to toggle wireframe mode.
In the Graphics window, select the crack front edge. The named selection is created for the selected edge. Create a coordinate system with a Y-axis aligned to crack normal. In the Graphics window, select the edge on the open side of the crack. The origin of the coordinate system should be on the open side of the crack. Under Principal Axis, for Axis, select Y. For Define by, select Global Z Axis. Leave all other values at their defaults. Select the Model object in the Tree Outline.
For Coordinate System, select the coordinate system you defined. In the Graphics toolbar, select the Face button. In the Graphics window, select the face on the closed side of the crack. In the Graphics window, select the top edge on the open side of the crack.
Select the Z Component and select Tabular. In the second row 2 , for Z[m], enter 5. In the Graphics window, select the bottom edge on the open side of the crack. In the second row 2 , for Z[m], enter Define results. Select each result and view the results in the Graphics window. View the Graph window for each result. The graph plots the distance of the crack front node from the origin and the energy release rate as it moves along the crack front.
Then crack mesh is generated on the defined crack and fracture parameters based on Stress Intensity Factors SIFS are computed and post-processed.
Import the model. In the Graphics window, select the body. For Method, select Tetrahedrons. This method is required for crack mesh generation. In the Tree Outline, select the Mesh object. December 12, 34 Release December 12, 35 Release December 12, 36 Release December 12, 37 Release Other items that can be added are Comments and Figures. December 12, 38 Release December 12, 39 Release December 12, 40 Release December 12, 41 Release December 12, 42 Release December 12, 43 Release December 12, 44 Release December 12, 45 Release December 12, 46 Release Flow conditions in spiral casing and the influence of various bend geometries By Tage Augustson.
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