Procedure For Analysis And Simulation Using Ansys

effect For depth psychology And Simulation Using AnsysThis section describes the boilers suit workflow involved when completeing propulsive fleeting structural compendium in the windup(prenominal) finish by exploitation ANSYS Workbench 12.0. separately stair get out include with blueprint that show how the synopsis and the closure been prep argond.5.2 Create compend formThere are several(prenominal) typefaces of analyses you raise perform in the ANSYS windup(prenominal) employment. However, in this chapter solitary(prenominal) transient structural Analysis procedure impart be cover to determine the dynamic reception of a structure chthonian the action of each world(a) time-dependent extends. The following dance step explain how to build a dodging in ANSYS Workbench. The set aside group in the Toolbox has been accepted with the Analysis Systems group.The appropriate templet has been selected which is perfunctory geomorphological (ANSYS). The templa te in the Toolbox has been double- pawl, or force it onto the Project Schematic. All possible fall localization of functions has been pre opinion by development a drag-and-drop operation.Alternatively, repair-click in the Project Schematic whitespace and select the type of digest you want to add.During creating a in the altogether form, the name of the remains is automatic eachy cozy uped and launch for editing. If you wish to throw the name, simply type the impertinently name. You faecal matter modification the name later by double-clicking the name to highlight it and typing the new name, or by selecting the Rename excerpt from the context menu (available via right-mo usance click on the header electric cell). plan 5.2 New Analysis System has been growd for Transient Structural (ANSYS) which is shown the location of the Toolbox and Project Schematic. Also shown the step to instant geometry.If necessary, mark appropriate engineering data for your abstract. Righ t click the engineer entropy cell, and select Edit, or double-click the applied science data cell. The plan data workspace appears, where you arsehole add or edit material data as necessary.Attach geometry to your form or build a new geometry in Design ruleler. Right click the Geometry cell and select Import Geometry to attach an alert humorl or select New Geometry to launch DesignModeler. normal 5.3 Windows for attaching geometry from SolidWorks 2009 burden to the governing body.Define all in all loads and boundary conditions. Right click the apparatus cell and select Edit. The appropriate application for the selected psycho psychodepth psychology type egress open the Mechanical application. Set up your abstract using that applications tools and features.You whoremonger solve your abridgment by issuing an Update, either from the data-integrated application youre using to stage up your synopsis, or from the ANSYS Workbench GUI.5.3 Engineering DataEngineering Da ta is a resource for material properties use in an abbreviation trunk. The Engineering Data workspace is designed to allow you to create, save, and retrieve material models, as well as to create libraries of data that foot be deliver and used in subsequent projects and by other users. Engineering Data can be shown as a component scheme or as a cell in both Mechanical analysis system. When viewed as a cell in a Mechanical analysis system, the workspace shows the material models and properties pertinent to that systems natural philosophy.To ingress Engineering DataInsert an Engineering Data component system or a Mechanical system into the Project Schematic.Select Edit from the Engineering Data cells context menu, or double-click the cell.The Engineering Data workspace appears. From here, navigate th crude(a) the data for the analysis system, access external data sources, create new data, and store data for prospective use. account 5.4 The Engineering Data workspace is designe d to allowed to create, save, and retrieve material models.5.4 Geometry rehearse the Geometry cell to import, create, edit or update the geometry model used for analysis. For this analysis, the geometry has been import from SolidWorks 2009 assembly bill format .SLDASM to the DesignModeler and there no need to be redraw again and proceed to the next step. Before Attaching CAD geometry to the Mechanical application, specifying several choices that determine the characteristics of the geometry you choose to import.Figure 5.5 Selecting desired length unit option before sop up DesignModeler workspace.Procedure attaching CAD geometry to the Mechanical application in condition CAD system is runningSelect the Geometry cell in an analysis system schematic.Right-click on the Geometry cell listed there.Double-click on the Model cell in the same analysis system schematic. The Mechanical application opens and displays the geometry.If required, set geometry options in the Mechanical applicatio n by highlighting the Geometry butt and choosing orbits infra Preferences in the Details view.Figure 5.6 DesignModeler workspace with success plentifuly imported from SolidWorks 2009 assembly file format which can be adjust as desired.5.5 Stiffness demeanorIn addition making agitates to the material properties of a part, designate a parts Stiffness Behaviour as flexible or soaked. linguistic context a parts behaviour as severe essentially reduces the delegation of the part to a single point mass and consequently significantly reducing the response time.For this analysis, the cylindric workpiece depart be a rigid body and thus both top and bottom clamp will be deposit as flexible body. This is because the analysis itself is to determine the response of the clamping to the time-vary load. A rigid part will need only data about the immersion of the material to calculate mass characteristics. Note that if density is temperature dependent, density will be judged at the reference temperature. For touch conditions, Youngs modulus has been stipulate.Figure 5.7 Shown the Details view for rod 16-2-1 changing the Stiffness behaviour of the cylindrical workpiece to the Rigid.5.6 Define ConnectionsConnections include get hold of regions, pegs, springs, or beams. see conditions are form where bodies meet. When an assembly is imported from a CAD system, progress to between mingled parts is mechanically detected. In this analysis there are only two type of connection that will be used which is encounter regions and reefers.5.6.1 Contact RegionsThe differences in the advert settings determine how the stiring bodies can come upon relational to one another. This is the more or less common setting and has the most impact for this analysis. or so of these types only apply to match regions made up of reckons only.Bonded This is the default flesh and applies to all contact regions (surfaces, solids, lines, faces, move ons). If contact regions are b onded, then no slide or breakup between faces or edges is allowed.No Separation This contact setting is similar to the bonded case. It only applies to regions of faces (for 3-D solids) or edges (for 2-D plates).Frictionless This setting models measuring rod unilateral contact that is, normal pressure equals zero if separation occurs. It only applies to regions of faces (for 3-D solids) or edges (for 2-D plates). A zero coefficient of friction is assumed, thus allowing lax sliding.Rough Similar to the frictionless setting, this setting models perfectly rough frictional contact where there is no sliding. It only applies to regions of faces (for 3-D solids) or edges (for 2-D plates).Frictional In this setting, two contacting faces can carry surcharge expresses up to a certain magnitude across their user interface before they start sliding relative to each other. It only applies to regions of faces. The model defines an equivalent clip stress at which sliding on the face begins a s a fraction of the contact pressure. Once the shear stress is exceeded, the two faces will slide relative to each other. The coefficient of friction can be any non- banish value.Choosing the appropriate contact type depends on the type of problem that are trying to solve. Modelling the ability of bodies to separate or open pretty is important and/or obtaining the stresses very near a contact interface is important, nonlinear contact types (Frictionless, Rough, Frictional) has been considered to be used. However, using these contact types military issues in extended response times and can vex possible convergence problems due to the contact nonlinearity. When determining the exact area of contact is critical, finer shut up has been considered to be used (using the Sizing control) on the contact faces or edges that will be explain on the next sub chapter.Friction Coefficient Allows you to tape a friction coefficient. exhibited only for frictional contact applications.Scope M ode Read-only property that displays how the contact region was generated. elevator carmatic Program automatically generated contact region.manual of arms Contact region was constructed or modified by the user. mien Sets contact twin to one of the followingAsymmetric Contact will be asymmetric for the solve. All face/edge and edge/edge contacts will be asymmetric.Asymmetric contact has one face as Contact and one face as Target (as defined garbage downstairs Scope Settings), creating a single contact pair. This is sometimes called one-pass contact, and is usually the most efficient way to model face-to-face contact for solid bodies.The behavior must be Asymmetric if the scoping includes a body specified with rigid Stiffness Behavior.Symmetric (Default) Contact will be symmetric for the solve.Auto Asymmetric Automatically creates an asymmetric contact pair, if possible. This can significantly amend performance in some instances. When you choose this setting, during the soluti on phase the problem solver will automatically choose the more appropriate contact face designation. Of course, you can designate the roles of each face in the contact pair manually.Figure 5.8 Shown are the summary of the connection in Worksheet view including contact information, go DOF checker, and joint information.5.6.2 Setting Contact Conditions ManuallyManual contact regions represent contact over the entire extent of the contact scope, for example, faces of the contact region.Procedure to set contact regions manually cut across the Connections goal in the Tree Outline.Click the right mouse tone ending and choose Insert Manual Contact Region. You can also select the Contact button on the tool quit.A Contact Region item appears in the Outline. Click that item, and under the Details View, specify the Contact and Target regions (faces or edges) and the contact type. retard the Contact and Target topics in the Scope Settings section for extra Contact Region scoping restrictio ns.5.7 sticksA joint typically serves as a unity where bodies are joined together. voice types are characterized by their rotational and translational tips of freedom as being fixed or free. For all joints that contract both translational degrees of freedom and rotational degrees of freedom, the kinematics of the joint is as follows interlingual rendition The moving coordinate system translates in the reference coordinate system. If your joint is a slot for example, the translation along X is expressed in the reference coordinate system.Once the translation has been applied, the center of the rotation is the location of the moving coordinate system.5.7.1 Types of unionsYou can create the following types of joints in the Mechanical applicationFixed JointRevolute JointCylindrical Jointtranslational JointSlot JointUniversal JointSpherical JointPlanar JointGeneral JointBushing Joint5.7.2 Applying JointsProcedure to add a joint manuallyAfter importing the model, highlight the Model physical object in the tree and choose the Connections button from the toolbar. sidle up the new Connections object and choose either Body-Ground type of joint or Body-Body type of joint from the toolbar, as applicable.Highlight the new Joint object and scope the joint to a face.Reposition the coordinate system institution location or orientation as postulate.The Body Views button in the toolbar displays Reference and fluid bodies in separate windows with appropriate transparencies applied. You have full body manipulation capabilities in each of these windows.Configure the joint. The Configure button in the toolbar positions the Mobile body according to the joint definition. You can then manipulate the joint interactively (for example, rotate the joint) directly on the model.Consider renaming the joint objects based on the type of joint and the names of the joined geometry.Display the Joint DOF Checker and modify joint definitions if necessary.Create a periphrasis analysis to interactively check the influence of individual joint degrees of freedom on the redundant constraints.Procedure to move a joint coordinate system to a picky faceHighlight the Coordinate System dramatics in the Details view of the Joint object. The origin of the coordinate system will include a yellow sphere indicating that the movement mode is active.Select the face that is to be the destination of the coordinate system. The coordinate system in movement mode relocates to the centroid of the selected face, leaving an shape of the coordinate system at its original location.Click the Apply button. The image of the coordinate system adjustments from movement mode to a permanent movement at the new location.Procedure to change the orientation of a joint coordinate systemHighlight the Coordinate System field in the Details view of the Joint object. The origin of the coordinate system will include a yellow sphere indicating that the movement mode is active.Click on any of the axis a rrows you wish to change. Additional handles are displayed for each axis.Click on the handle or axis representing the new direction to which you want to reorient the initially selected axis.The axis performs a flip transformation.Click the Apply button. The image of the coordinate system changes from movement mode to a permanent presence at the new orientation.You can change or delete the place of the flip transformation by highlighting the Reference Coordinate System object or a Mobile Coordinate System object and making the change or deletion under the Transformations category in the Details view of the child joint coordinate system.When selecting either a Reference Coordinate System object or a Mobile Coordinate System object, various settings are displayed in the Details view.5.8 displaceIn this stage, the model need to be interlock in dedicate to analyze the model. The goal of earningswork in ANSYS Workbench is to provide robust, slack to use interneting tools that will simplify the mesh generation process. These tools have the benefit of being highly automated along with having a maintain to high degree of user control.5.8.1 Physics Based participationWhen the runing application is launched from the ANSYS Workbench Project Schematic, the natural philosophy preference will be set based on the type of system being edited. For a Mechanical Model system as in this analysis, the Mechanical physics preference is used. For a interlocking system, the physics preference defined in Tools Options Meshing Default Physics Preference is used.Upon startup of the Meshing application from a Mesh system, the Meshing Options circuit card shown below in figure 5.5. This decorate allows to quickly and easily set meshing preferences based on the physics are prepared to be solved. Remove the panel after startup, the panel can be display again by clicking the Options button from the Mesh toolbar.Figure 5.9 Meshing option in Mechanical application.The first option the panel allows to set is Physics Preference. This corresponds to the Physics Preference value in the Details View of the Mesh folder. Setting the meshing defaults to a specified physics preference sets options in the Mesh folder much(prenominal) as Relevance Center, midside node behavior, shape checking, and other meshing behaviors.ANSYS Workbench meshing capabilities, arranged according to the physics type involved in the analysis. For this analysis, Mechanical physics is used, the preferred meshers for mechanical analysis are the patch conformist meshers (Patch Conforming Tetrahedrons and Sweeping) for solid bodies and any of the surface body meshers.5.8.2 Using 3D Rigid Body Contact MeshingThis section describes the basic steps for using 3D rigid body contact meshing.Procedure to define a 3D rigid body for contact meshing blossom out the model in the Mechanical application.In the Tree, expand the Geometry object so that the body objects are visible.Click on the body that you w ant to define as a rigid body.In the Details Definition view for the body, change the value of the Stiffness Behavior control to Rigid.If you wish to control the mesh method, insert a mesh method by right-clicking on the Mesh object in the Tree and selecting Insert Method.In the Details View, scope the mesh method to the rigid body.If desired, change the value of the Element Midside Nodes control. leave the mesh by right-clicking on the Mesh object in the Tree and selecting Generate Mesh.Figure 5.10 meshing result for current design analysis.5.9 Establish Analysis SettingsIn transient structural analysis includes a group of analysis settings that allow to define various solution options customized to the specific analysis type, such as large deflection for a stress analysis. Default set are included for all settings.Procedure to verify/change analysis settings in the Mechanical applicationHighlight the Analysis Settings object in the tree. This object was inserted automatically whe n you established a new analysis in the Create Analysis System overall step.Verify or change settings in the Details view of the Analysis Settings object. These settings include default set that are specific to the analysis type. Accept these defaults. In this analysis involves the use of steps, by refering to the procedures presented below.Procedure to create multiple stepsHighlight the Analysis Settings object in the tree. Modify the Number of rates field in the Details view. Each additional amount has a default Step End Time that is one second more than the previous step.These step end times can be modified as needed in the Details view. Adding more steps simply by adding additional step End Time values in the tabular Data window..Figure 5.11 The following presentation illustrates adding steps by modifying the Number of locomote field in the Details viewProcedure to fixateing Analysis Settings for nine-fold StepsCreate multiple steps following the procedure To create multi ple steps above.Most Step Controls, Nonlinear Controls, and Output Controls palm in the Details view of Analysis Settings are step aware, that is, these settings can be distinct for each step.Activate a particular step by selecting a time value in the chart window or the Step bar displayed below the chart in the chart window. The Step Controls grouping in the Details view indicates the active Step ID and corresponding Step End Time.Figure 5.12 The following demonstration illustrates routine on the legend in the Graph window, entering analysis settings for a step, and entering different analysis settings for another step.To specify the same analysis setting(s) to several steps, select all the steps of interest as follows and change the analysis settings details.To change analysis settings for a subset of all of the steps from the tabular Data windowHighlight the Analysis Settings object.Highlight steps in the Tabular Data window using either of the following standard windowing te chniquesCtrl key to highlight individual steps.Shift key to highlight a continuous group of steps.Click the right mouse button in the window and choose Select All Highlighted Steps from the context menu.Specify the analysis settings as needed. These settings will apply to all selected steps.To specify analysis settings for all the stepsClick the right mouse button in either window and choose Select All Steps.Specify the analysis settings as needed. These settings will apply to all selected steps.Figure 5.13 The following demonstration illustrates multiple step plectron using the bar in the Graph window, entering analysis settings for all selected steps, selecting only highlighted steps in the Tabular Data window, and selecting all steps.Figure 5.14 The Worksheet tab for the Analysis Settings object provides a single display of pertinent settings in the Details view for all steps.5.10 Joint blameWhen using joints in a Transient Structural (ANSYS) analysis, use a Joint Load object t o apply a kinematic driving condition to a single degree of freedom on a Joint object. Joint Load objects are applicable to all joint types except fixed, general, universal, and spherical joints. For translation degrees of freedom, the Joint Load can apply a displacement, velocity, quickening, or force. For rotation degrees of freedom, the Joint Load can apply a rotation, angular velocity, angular acceleration, or moment. The directions of the degrees of freedom are based on the reference coordinate system of the joint and not on the mobile coordinate system.A positive joint load will tend to cause the mobile body to move in the positive degree of freedom direction with respect to the reference body, presumptuous the mobile body is free to move. If the mobile body is not free to move then the reference body will tend to move in the negative degree of freedom direction for the Joint Load. For the joint with the applied Joint Load, dragging the mouse will indicate the temperament of the reference/mobile definition in terms of positive and negative motion.Procedure to apply a Joint LoadHighlight the Transient environment object and insert a Joint Load from the right mouse button context menu or from the Loads drop down menu in the Environment toolbar.From the Joint drop down list in the Details view of the Joint Load, select the particular Joint object that you would like to apply to the Joint Load. You should apply a Joint Load to the mobile bodies of the joint. It is therefore important to carefully select the reference and mobile bodies while defining the joint.Select the unconstrained degree of freedom for applying the Joint Load, based on the type of joint. You make this selection from the DOF drop down list. For joint types that allow multiple unconstrained degrees of freedom, a separate Joint Load is necessary to drive each one. Joint Load objects that include velocity, acceleration, rotational velocity or rotational acceleration are not applicable to st atic structural analyses.Select the type of Joint Load from the Type drop down list. The list is filtered with choices of Displacement, Velocity, Acceleration, and twinge if you selected a translational DOF in step 3. The choices are Rotation, rotational Velocity, Rotational Acceleration, and Moment if you selected a rotational DOF.Specify the magnitude of the Joint Load type selected in step 4 as a constant, in tabular format, or as a function of time using the same procedure as is done for most loads in the Mechanical application.On Windows platforms, an alternative and more convenient way to put through steps 1 and 2 above is to drag and drop the Joint object of interest from under the Connections object folder to the Transient object folder. When you highlight the new Joint Load object, the Joint field is already completed and you can continue at step 3 with DOF selection.Figure 5.15 All load applied to the structural for current design analysis including Earth Gravity, Horizo ntal Joint Load and Vertical Joint Load.5.11 drubThis step initiates the solution process. The solution has been carried out on the local machine. Since transient solutions can take significant time to complete, a status bar is provided that indicates the overall progress of solution. More exact information on solution status can be obtained from the origin Information object which is automatically inserted under the Solution folder for all analyses.Figure 5.16 More detailed information on solution status can be obtained from the Solution Information in Worksheet view.The overall solution progress is indicated by a status bar. In addition the Solution Information object has been used which is inserted automatically under the Solution folder. This object allows toView the actual product from the solver,Graphically monitor items such as convergence criteria for nonlinear problems and make possible reasons for convergence difficulties by plotting Newton-Raphson residuals.5.12 Revie w ResultsFor this transient structural analysis, the interested will be in total deformation and maximum shear results. The Results in the Mechanical Application will show as figure and tabular data.Procedure to add result objects in the Mechanical applicationHighlight a Solution object in the tree.Select the appropriate result from the Solution context toolbar or use the right-mouse click option.Figure 5.17 Shown the right-click mouse option to add result in Mechanical application for Total Deformation.Procedure to review results in the Mechanical applicationClick on a result object in the tree.After the solution has been calculated, review and interpret the results in the following waysContour results Displays a contour plot of a result such as stress over geometry.Vector Plots Displays certain results in the form of vectors (arrows).Probes Displays a result at a single time point, or as a variation over time, using a graph and a table.Charts Displays different results over t ime, or displays one result against another result, for example, force vs. displacement. life-time Animates the variation of results over geometry including the deformation of the structure.Stress Tool to evaluate a design using various failure theories.Fatigue Tool to perform advanced life prediction calculations.Contact Tool to review contact region behavior in complex assemblies.Beam Tool to evaluate stresses in line body representations.Figure 5.18 A contour result of Maximum Shear Stress for current design. All the contour colour indicate different value of shear stress over a geometry.