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I have a question about the Tensile Modulus Result.
I have chosen the Material Celstran +GF30-05 CN01/10: Celanese.
In the Details Section -> Mechnical Properties you can find Data about the Elastic Modulus in 1st and 2nd principal direction.
My question: If I run an analysis with this Material, the maximum Values of the Result "Tensile Modulus in first pricipal direction" are about 2-times higher than in the Mechanical Properties Card of the Material. Can someone explain these differences?
Mechanical properties of a material are dtermined for a specific sample having some fiber orientation. If the composite properties are supplemental (shown in red) then they are calculated for fiber orientation in flow direction A11=0.73. If the composite properties are measured (shown in black) then the software finds the matrix properties and sample's fiber orientation to better match the measurements. Usually the calculated sample's A11 is in the range 0.6..0.8
Somewhere in the simulation results the fiber orientation might be nearly perfect with A11~0.99 (for midplane and surface meshes the fibers are supposed to be alighned on the edges, giving there A11=1). Mechanical properties for fully aligned fiber composite might be siginificantly higher than for the injection molded sample used for measurements.
In my simulation I get values which are about 2 times higher than in the material card. Is this in a normal range?
I have another question:
If Moldflow measures a material, how do you calibrate your material data? I ask this question, because you do not know the fiber orientation in your test piece and so you do not know the orientation tensor!?
