MSC.Patran Connector Elements Enhancements. June, 2004
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1 MSCPatran Connector Elements Enhancements June, 2004
2 MSCNastran connector elements are now supported as core implementations Support the the generation, translation, and results processing of MSCNastran Spot Weld (CWELD) and fastener (CFAST) connectors These elements are added as a new FEM entity type throughout the system Seamless integration to the group, graphics/picking, list-processing, and results sub-systems 2
3 Two methods to define Spot Weld (CWELD) locations Projection: specifies a node or point in space that is to be projected onto the two surface patches of the connector to determine the end points, GA and GB The point specified for the Projection method is projected onto each surface patch Nodes are generated at those locations, and the Pierce Nodes, GA and GB, are assigned the new node ids Axis: specifies nodes directly for GA and GB Nodes specified for the Axis method define the GA and GB piercing nodes directly 3
4 4 types of surface patch A to surface patch B connectivity are supported Elem to Elem (ELEMID and ALIGN formats) Patch to Patch (ELPAT format) Prop to Prop (PARTPAT format) Node to Node (GRIDID format) 4
5 4 types of surface patch A to surface patch B connectivity are supported Elem to Elem (ELEMID and ALIGN formats) Top and Bottom shell elements defining the surface patches for the weld If not specified, then both GA and GB are required (ALIGN format) Otherwise, one top/bottom element pair per connector is required Regardless of GA, GB, and the weld diameter, only a single element per patch is connected Patch to Patch (ELPAT format) Shell element on each surface defining the connecting surface patches (one pair per connector) Depending on the pierce locations (GA and GB) and the weld diameter, the number of connected elements may expand to up to a 3x3 element patch 5
6 4 types of surface patch A to surface patch B connectivity are supported Prop to Prop (PARTPAT format) Properties associated with shell elements defining the connectivity of the weld (one pair per connector) Depending on the pierce locations (GA and GB) and the weld diameter, the number of connected elements may range from one element up to a 3x3 element patch Multiple connector locations may be specified for a single property pair The same pair will be used for each connector created 6
7 4 types of surface patch A to surface patch B connectivity are supported Node to Node (GRIDID format) Topology of each surface patch: Tri3, Tri6, Quad4, Quad8 Nodes (GAi and GBi) defining the connecting surface patches (one list pair per connector) The surface patches are defined as 3/6 node triangle or 4/8 node quad regions, the topology of which is indicated by SPTYP If Node List B (GBi) is blank, then a point-to-patch connection is created 7
8 Spot weld (CWELD) properties definition The spot weld diameter (required, no default) M-Set DOF elimination flag (default off) The material property defining the weld material (required, no default) 8
9 Modify spot weld (CWELD) connectors A single connector may be selected from the screen, or entered from the keyboard For keyboard entry, the values are not populated until focus leaves the Connector select databox Note that if multiple connectors are selected, then only the data that has common values amongst the selected connectors shall be modifiable All other controls will be disabled 9
10 Show spot weld (CWELD) connectors Upon selecting connectors, a spreadsheet form shall be presented to show the values of each attribute of the selected connectors Wherever appropriate, if a cell for an attribute is selected, then whatever additional information that is available for that attribute is presented in a text window below the spreadsheet, as is standard for most spreadsheets in Patran 10
11 Delete spot weld (CWELD) connectors Two forms under the Delete action can be used to delete connectors 11
12 Fastener (CFAST) connectors The GUI for creating, modifying, showing, and deleting fasteners (CFASTs) is consistent with that described previously for the Spot Weld (CWELD) Connector There are two primary differences CFAST only has two formats, PROP and ELEM Analogous to PARTPAT and ELPAT of CWELD respectively Other than the diameter specification, the PFAST properties are completely different than PWELD D The diameter (> 00, required) MCID The element stiffness coordinate system (>= -1, default -1) MFLAG = 0, MCID is relative (default) = 1, MCID is absolute KTi Stiffness values in directions 1-3 (real, required) KRi Rotational stiffness values in directions 1-3 (default 00) MASS Lumped mass of the fastener (default 00) 12
13 Fastener (CFAST) connectors 13
14 Connector User Scenario Locate and create CWELD/CFAST connections automatically for nodes
15 Scenario 1 Create single CEWLD Spot weld location Node 2019 With Projection method Connectivity type Prop to Prop Property set pcomp11 to innen Diameter - 4 Surface Patch A w/ Property pcomp11 Surface Patch B w/ Property innen Node
16 Scenario 1 Create single CEWLD Spot weld location Node 2019 With Projection method Connectivity type Prop to Prop Property set pcomp11 to innen Diameter - 4 Spot Weld Connector created 16
17 Scenario 1 Create single CEWLD $ Elements and Element Properties for region : innen PSHELL $ Elements and Element Properties for region : pcomp11 $ Composite Property Record created from P3/PATRAN composite material $ record : pcomp11 $ Composite Material Description : PCOMP SYM YES YES YES YES YES YES YES YES YES YES YES YES $ Connector elements and properties for region : prop_2019 PWELD OFF SPOT CWELD PARTPAT GRID GRID GRID Automatic creation of GA & GB 17
18 Scenario 2 Create multiple CEWLDs Spot weld location Node 2016, 2017, 2018 & 2019 With Projection method Connectivity type Prop to Prop Property set pcomp11 to innen Diameter - 4 Surface Patch A w/ Property pcomp11 Surface Patch B w/ Property innen Node 2016 Node 2018 Node 2017 Node
19 Scenario 2 Create multiple CEWLDs Spot weld location Node 2016, 2017, 2018 & 2019 With Projection method Connectivity type Prop to Prop Property set pcomp11 to innen Diameter Spot Weld Connectors created 19
20 Scenario 2 Create multiple CEWLDs $ Elements and Element Properties for region : innen PSHELL $ Elements and Element Properties for region : pcomp11 $ Composite Property Record created from P3/PATRAN composite material $ record : pcomp11 $ Composite Material Description : PCOMP SYM YES YES YES YES YES YES YES YES YES YES YES YES $ Connector elements and properties for region : prop_2019 PWELD OFF SPOT CWELD PARTPAT CWELD PARTPAT CWELD PARTPAT CWELD PARTPAT GRID GRID GRID GRID GRID GRID GRID GRID GRID Automatic creation of GA & GB 20
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