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44 Ply Modeling Requirements During the composites development process, the details of the composites layup are not considered during initial sizing and so a conventional zone-based composites description is typically used. In fact, for preliminary work the layup on a property region is often smeared (using <strong>MSC</strong>.Nastran’s SMEAR and SMCORE options) as an aid to rapid design improvement. However, as the design evolves, the ply details must be specified in order to ensure a producible part as shown below. For the certification of aircraft structures, it is important to understate the detailed stress state of each global ply. For effective visualization, it is important that results are plotted on the basis of global plies. The need for this is clearly illustrated with a simple model of crossing plies shown below. Using a conventional zone description of the layup, the results are difficult to visualize as they do not reflect the arrangement of the structure. Even worse, results from plies that may be of different material, thickness, and orientation are shown together and perhaps interpolated. By contrast, the global ply model allows you to interpret the model effectively. Furthermore, detailed stresses on a ply basis are optionally available in the f06 file for the purposes of certification.
Manual Creation of PCOMPG Data CHAPTER 3 Analysis Preferences <strong>MSC</strong>.Patran 2005 enables you to create global ply models using its productive and familiar interface. Within the material application, the spreadsheet for defining laminate layer data simply incorporates an additional column where global ply IDs can be defined. Note that it remains possible to define no global ply IDs, which would result in a conventional PCOMP card being generated. If global ply IDs are needed, each layer must have a positive GPLYID that is unique in that laminate material. In order to clearly differentiate between layered and global ply results, it is recommended that GPLYIDs be chosen from a range that will not overlap with layer indices. For example, for typical models that have fewer than several hundred layers, it is good practice to number ply IDs beginning at 1001. 45
Page 1 and 2: 1 MSC.Patran 2005 at a Glance C O N
Page 3: 4 Updates to Basic Functions ■ MS
Page 6 and 7: 2 1.1 Key Highlights for MSC.Patran
Page 8 and 9: 4 Preserve MSC.Nastran Names A feat
Page 10 and 11: 6 Domain Decomposition Domain decom
Page 12 and 13: 8 Pro/ENGINEER must be able to be e
Page 14 and 15: 10 1.3 Supported Platforms, Operati
Page 16 and 17: 12 CAD Direct Access MSC.Patran 200
Page 18 and 19: 14 Set your default directory to yo
Page 20 and 21: 16 1.5 Technical Support For help w
Page 23 and 24: CHAPTER 2 MSC.Patran Release Guide
Page 25 and 26: CHAPTER 2 File Import/Export and CA
Page 27 and 28: 2.2 CAD Imports (Create Groups from
Page 29: 2.4 MSC.Patran Gateway to CATIA V5
Page 32 and 33: 28 3.1 MSC.Nastran Preference Enhan
Page 34 and 35: 30 Elements and Properties SOL 700
Page 36 and 37: 32 Solution Parameters Analysis job
Page 38 and 39: 34 From Other Solutions: For MSC.Na
Page 40 and 41: 36 Contact Table: The contact table
Page 42 and 43: 38 Access Results LS-Dyna’s 3dplo
Page 44 and 45: 40 Method Select from two methods f
Page 46 and 47: 42 Node to Node (GRIDID format) Sti
Page 50 and 51: 46 When writing out the MSC.Nastran
Page 52 and 53: 48 Because MSC.Laminate Modeler est
Page 54 and 55: 50 3.2 MSC.Marc Preference Enhancem
Page 56 and 57: 52 RBE3 Reference node. Additional
Page 58 and 59: 54 Tied nodes Section A Overclosure
Page 60 and 61: 56 Material Models Virtually all of
Page 62 and 63: 58 assumed with the first stress va
Page 64 and 65: 60 Contact The following improvemen
Page 66 and 67: 62 Table Support (TABLE) All contac
Page 68 and 69: 64 For nodal results: Stress, Inter
Page 70 and 71: 66 3.3 MSC.Dytran Preference Enhanc
Page 72 and 73: 68 Entity Type MSC.Dytran Entries F
Page 74 and 75: 70 Analysis Enhancements This secti
Page 76 and 77: 72 Defines PARAM HGSHELL. Select De
Page 78 and 79: 74 Output Requests Enhancements The
Page 81 and 82: CHAPTER 4 MSC.Patran Release Guide
Page 83 and 84: Other LBC Display Behaviors Changes
Page 85 and 86: CHAPTER 4 Updates to Basic Function
Page 87 and 88: 4.3 Three Gigabyte Memory Support C
Page 89 and 90: CHAPTER 4 Updates to Basic Function
Page 91 and 92: 4.5 Pre-Release Functionality Advan
Page 93 and 94: Create Surfaces/ Initial Creation/A
Page 95 and 96: Initial Creation/Pseudo-Surface Too
Page 97 and 98: Initial Creation/Pseudo-Surface Ope
Page 99 and 100:
Cleanup Process Icon Specifies the
Page 101 and 102:
Cleanup/Merge Vertices Merge Vertic
Page 103 and 104:
Edit/Merge Surfaces CHAPTER 4 Updat
Page 105 and 106:
Edit/Fill Hole CHAPTER 4 Updates to
Page 107 and 108:
Display Small Entities Feature Prop
Page 109 and 110:
Edit/Split Surface CHAPTER 4 Update
Page 111 and 112:
Final Mesh Process Icon Specifies t
Page 113 and 114:
CHAPTER 4 Updates to Basic Function
Page 115 and 116:
CHAPTER 4 Updates to Basic Function
Page 117 and 118:
I N D E X MSC.Patran Release Guide
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