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CHAPTER 11 - CONCEPT OF SURFACES

CHAPTER 11 - CONCEPT OF SURFACES. CONTENTS. Surface Definition Surface Creation Surface Usage.

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CHAPTER 11 - CONCEPT OF SURFACES

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  1. CHAPTER 11 - CONCEPT OF SURFACES

  2. CONTENTS • Surface Definition • Surface Creation • Surface Usage

  3. A surface is a collection of 2 dimensional facets that can be used in loads and boundary constraintsA surface is defined as a set of segmentsIt can have a three dimensional goemetrySurfaces do not have physical properties like mass, inertia or thickness but only have a geometrical importance SURFACE DEFINITION

  4. SURFACE CREATION Surface created directly from elements SURFACE, 1,, ELEM, 10 SET1, 10, 1, THRU, 499Surface created from properties SURFACE, 2,, PROP, 20 SET1, 20, 101, 102, 103 PSHELL,101, 1 , .01 PSHELL,102, 2 , .01 PSHELL,103, 1 , .01

  5. SURFACE CREATION Surface created from materials SURFACE, 2,, MAT, 30 SET1, 30, 1, 2 PSHELL,101, 1 , .01 PSHELL,102, 2 , .01 PSHELL,103, 1 , .01 MAT1, 1, 3E7, , .33, 7800. DMATEP,2, 7850., 210.E9, 0.3

  6. SURFACE CREATION (continued) Surface created from mixed definitions SURFACE, 2,, MAT, 30, PROP, 20, ELEM, 10 SET1, 30, 1 SET1, 20, 102 SET1, 10, 1, THRU, 499 PSHELL,101, 1 , .01 PSHELL,102, 2 , .01 PSHELL,103, 1 , .01 MAT1, 1, 3E7, , .33, 7800.

  7. Surfaces on Solid elements Surfaces can also be defined on faces of solid elementsThe CFACE entry defines a segment on the relative face on an elementExample: Surface 10 is defined with two faces The relative face 4 of element 1296 is defined as cface number 301 and is part of set 22 The relative face 4 of element 1297 is defined as cface number 302 and is also part of set 22SURFACE, 10, , SEG, 22 CFACE, 301, 22, 1296, 4 CFACE, 302, 22, 1297, 4

  8. DEFINING CFACES • Because most pre-processors do not support writing CFACEs, they can be defined indirectly • Defining CFACEs by using CQUAD4 and/or CTRIA3 elements with a thickness of 9999. • SURFACE,20,,SEG,22 PSHELL, 22, 204, 9999. CQUAD, 301, 22, 1296, 4 CQUAD, 302, 22, 1297, 4 • is the same as • SURFACE,20,,SEG,22 CFACE, 301, 22, 1296, 4 CFACE, 302, 22, 1297, 4 • Defining CFACEs by using PLOAD4 entry with pressure 9999.SURFACE,20,,SEG,22PLOAD4, 22, 1296, 9999. PLOAD4, 22, 1297, 9999. • is the same as • SURFACE,20,,SEG,22CFACE, 301, 22, 1296, 4 CFACE, 302, 22, 1297, 4

  9. SURFACE USAGE Rigid Connection RCONN, 1, SURF, SURF, 7, 8 Rigid Body Definition RIGID, 25, 333, 200.,, 1., 1., 1. SURFACE, 333,, PROP, 111

  10. SURFACE USAGE Contact surface CONTACT,1,SURF,SURF,202,102 SURFACE, 102, , PROP, 103 SURFACE, 202, , MAT, 203 Slave Surface Master Surface

  11. SURFACE USAGE General coupling surface COUPLE, 1, 100, INSIDE, ON, ON SURFACE, 100, , ELEM, 11

  12. Lagrange Mesh ALE Coupling Surface Euler Material Euler Mesh SURFACE USAGE ALE coupling surface ALE, 1, 100, 101 SURFACE, 777, , ELEM, 5 SURFACE, 101, , SEG, 12

  13. SURFACE USAGE The same surface can be used for different applications Example: Surface 333 is rigid, has contact with another surface and is used as a coupling surface SURFACE, 333, , PROP, 103 RIGID, 25, 333, 200.,, 1., 1., 1. COUPLE, 1, 333, INSIDE, ON, ON CONTACT,1,SURF,SURF,202,333 SURFACE, 202, , MAT, 203

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