Icem_CFD_CFX流体学习资料 Icem CFD CFX流体学习资料 CFX_ICEMCFD_11_培训教程_2008_04 ICEMCFD110 F1-Props_Consts_LoadsV11

1、Connectors, Properties, Constraints and Loads(AI*Environment only),Connectors, Properties, Constraints and Loads,To prepare model for FEA analysis All in one model setup within common AI*Environment gui Can then run solver in background from AI*Environment Connectors Two point bar elements Represent

2、 beams, bars, rigids, welds, springs, etc. Properties, Assign material properties to geometry/mesh Constraints Constraints and displacements Directional and rotational Applied to points, curves, surfaces and/or geometry/mesh subsets,Arbitrary Connectors,A number of different Connectors are available

3、,Source Entity,Target Entity,Arbitrary connectors are used to connect entities with line elements. Line Element properties are then assigned. Entities can be points, curves or surfaces, typically at least one is a point In this example, every node along the curve is connected to the point by line el

4、ements These connectors can be applied before or after the part is meshed,Arbitrary,Bolt Hole,Seam Weld,Spot Weld,Spot Weld from File,Line Connectors,Source Entities,Target Entity,Connectors,Bolt Spiders create a center node and connect line elements to the surrounding curve An optional washer can a

5、lso connect the central node to the outside of the first layer of shells for additional stiffness simulating a washer,Bolt Spider w/ Washer,Seam Welds,Seam Welds can be Point to point welds, Curtain Tris/Quads or Quad Tent Welds (Glinka),Curtain Quad Weld,Glinka Quad Welds,Point to Point Seam Weld,T

6、ent Welds Extend the surfaces to intersection and then diagonal quads represent the fillet welds Diagonals can be added on one side or both No. Layers is the number of quad rows along the welds The weld spacing can be determined by specifying the Distance to weld toe, the Number of layers to the toe

7、, and the Growth ratio after weld or by specifying the fillet radius of the weld,Spot Welds,A number of different Connectors are available,Spot welds connect two parts at a certain location, usually given in X Y Z coordinates The two parts can be connected with 4 different weld types Simple Point to

8、 Point Line elements connecting shells of the connected part The weld may need to split or remesh the shells of one or more connected parts Mesh Independent Line Mesh Independent Hexa Hexa Element connected by line elements to the shell elements of the connected parts Area Weld A web of line element

9、s connect all the nodes between two surfaces,Point to Point Welds,Hex Elements Line Elems (RBE3),9,This column must define the connection “TYPE”.,All connections,must,be specified as shown.,These columns define the X,Y,Z,coordinates of the connection location.,These columns define the parts connecte

10、d.,This column is important for “MASTIC” connections.,If column # 1 has “WSPOT”, column # 9 should be left blank.,Column #,Spot Weld From File,The standard Spot Weld file should be space delimited text in this format,0,0,0,Point to Point Welds,Point to Point Welds,Mesh Independent Hex Welds “Mastics

11、”,The Properties Tab,After completing the mesh, users define material and element (section) properties using the “Properties” tab Material Properties: Read existing material file (*.mat) Write a material file for later use (*.mat) Create new material properties Create Material Property Table Element

12、 (section) Properties: 0d (Point) elements (MASS elements) 1d (Line) elements Bars, Beams, Rigids, Dampers, Springs, etc. 2d (Shell) elements Thin Shells Shear Panels 3d (Elastic Solid) elements,Material Properties,Element Properties,Creating Material Properties,Create Material Properties; Define li

13、near isotropic material properties Material properties should be defined in consistent units Type: Several types of material are allowed Isotropic Shell Element Anisotropic Solid Element Anisotropic Shell Element Orthotropic Each property has a constant or varying option For Constant, simply fill in

14、 the value field For Varying, first create a table (shown later) There are 9 primary material properties, scroll down for more.,Creating Material Properties,Scrolling down reveals more Properties Material Properties Youngs Modulus Shear Modulus Poissons Ratio Mass Density Thermal Expansion Coefficie

15、nt With Reference Temperature Structural Element Damping Coefficient Stress limits for Tension Stress limits for Compression Stress limits for Shear The last field is for the Material Coordinate System Used for anisotropic and orthotropic materials First create a coordinate system Apply and the new

16、material will appear in the Model tree.,Temperature Dependent / Nonlinear Properties,Load from File (text) or by filling in spreadsheet like table entries Save material properties to a text file Graph material properties,Name and ID Name each table and give unique ID numbers Table Type Temperature D

17、ependent Nonlinear Nonlinear Temperature Dynamic Load Modal Damping Edit Table to bring up the table editor:,Temperature Dependent / Nonlinear Properties,Applying a Table Use the Varying option under a particular material property Set the Base value to a good initial guess for that value, typically

18、the published “constant” value should be used Note: Property as (x) = Base Value y(x) Use the Table pull-down to select the correct table. fill in all appropriate fields, then Apply The tables and material properties appear in the model tree,Element Properties,Types: : Point (masses) 1D Properties:

19、Bar Rigids (RBAR RBE2 RBE3) Rod Connection Damper Connection Spring Viscous Damper Beam Gap Beam with Cross Section,Element properties can be accessed via the icons in the Properties tab shown here,2D Properties Thin Shells: Shear Panels: Layered Composites 3D Properties Apply material properties to

20、 3D elements,Common to all properties: Part: part element property is associated to Material name PID: property ID number Should be Unique within a model Set to 0 for auto assign,Local Coordinate Systems,Create a coordinate System by clicking on the icon in the Utility ICONS Name/Number; must be uni

21、que to each coordinate system Reference; Global or a previously created LCS Type; Rectangular / Cylindrical / Spherical Defined by; 3 Points; Center, First Direction (x or r), Point on First Plane 1 Point; just moves center, orientation remains like global,The Default is the Rectangular Global C.S.,

22、 but many features can use a Local C.S.,Local Coordinate Systems,To set up a Cylindrical Local Coordinate System Change the Name and Number for our second coordinate system Change the Type to Cylindrical Pick three points and Apply Similarly for a Spherical LCS LCS control is in the model tree,Geome

23、try Creation, Loads, Constraints, etc, work with the active or specified LCS,Equivalent directions: Rectangular X Y Z Cylindrical r t z Spherical r t p,t is for Theta, p is for Phi, ,AI*Environment Boundary Conditions,Generally: Constraints, imposed displacement and loads may be defined on the geome

24、try or the mesh (or both) Constraints (Displacements) are grouped in SPC sets (Single Point Constraint) in the Display Tree according to user preference Loads are grouped in “Load Sets” or “Temperature Sets” in the Display Tree,Constraints,Constraints can be applied to points, curves, surfaces and s

25、ubsets Choose Name, and SPC set Select entities to be constrained Select directions and enter magnitudes for displacement Set Magnitude to zero for constraints Constraint/Displacement symbols are applied to the entity,Imposed Displacements,Imposed Displacements can be applied to points, curves and s

26、urfaces as well as subsets Chose a name and SPC set reference Select entities to be constrained. Select directions and enter magnitudes for displacement Displacement Symbols are applied to the entity,Define Contact,Define arbitrary contact for some solvers ANSYS and LS-DYNA Auto Detect with tolerance LS-DYNA supports many types of Contact Setting Solver LS-Dyna,Note: Contact definitions are applied to surfaces and then transferred to mesh. The appropriate constraint equations are written when sent to solver,Define Contact,Manually Define Contact Contact Surfaces Target S