thread727-313308 Hi guys, Am

[Ibren]

thread727-313308

Hi guys,

Am new to Nastran software, am working on fea of composite laminates. Kindly what are the values needed for G11,G12,G13,G22,G23,G33 in MAT 2. The given values are E1,E2,G12 and v12. Am using PCOMP to describe the material properties.
Thanks in advance.

 

[klaus.]

Well i would say these are Material Parameter you need to define for your Model

 

[Erik Panos Kostson]

Use MAT8 that has E1, E2, ..G12, v12.

Small example below for a single CQUAD4 with PCOMP (two plies 0.001 m thick) and MAT8 (Carbon/Epoxy (AS/3501) Vf = 0.66))


CQUAD4 1 1 1 2 3 40.0000000.000000+0000005
+0000005 0.0020000.0020000.0020000.002000
$
$--------------------------------------------------------------------------------
$ SURFACE ELEMENT PROPERTIES
$--------------------------------------------------------------------------------
$
PCOMP* 1-1.000000000E-3 0.000000000E+0 +0000006
*0000006 0.000000000E+0 +0000007
*0000007 1000001 1.000000000E-3 0.000000000E+0 +0000008
*0000008 1000001 1.000000000E-3 0.000000000E+0 +0000009
$
$ PLY PROPERTY 1: 'Ply Property 1'
$
MAT8* 1000001 1.380000000E+11 8.960000000E+9 3.000000000E-1 +000000A
*000000A 7.100000000E+9 1.600000000E+3 +000000B
*000000B-3.000000000E-7 2.810000000E-5 +000000C
*000000C +000000D
*000000D 0.000000000E+0 +000000E
*000000E
$
ENDDATA

 

[Ibren]

Thanks a lot guys,

i do appreciate your assistance. I cant use MAT 8 because i presume my material as anistropic and that goes with MAT2. Kindly if you can explain to me those G's needed based on the given values (E1,E2,G12 and v12).
Thanks in advance.

 

[Erik Panos Kostson]

Well if you have these values given then use mat8 that is orthotropic and used for composites

For more info on mat2 see the help manual that describes these terms via the relation between stresses and strains, so it is the material matrix that relates the two.
See this for some info on this (PS if you have only E1 and E2 and v12 and G12 then you are going most likely to end up with orthotropic material anyhow)

http://resonalyser.com/abouttheory/

http://help.solidworks.com/2017/english/solidworks/cworks/c_linear_elastic_orthotropic.htm

 

[Ibren]

Thanks a lot Erik, the above links have been very helpful.

 

[karachun]

You can check MAT2 description in Nastran Quick Reference Guide, p.1824.
QRG.pdf