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transverse shear stiffness for uhyper/umat material

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Posts: 33
Topic starter
(@rbcheng1025)
Eminent Member
Joined: 16 years ago

I have a user defined material for shell element. But i have to predefine the transverse shear stiffness in section definition in ABAQUS.

I guessed some values, some can converge some diverge so if this parameter will influence the final results (i mean the deformed shape like curvature...) by the way, is this parameter always a constant or it will change during deformation?

Thank you very much.

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Posts: 3998
(@jorgen)
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Joined: 4 years ago

The transverse shear stiffness can be defined either as a section control variable (a constant), or as part of the VUMAT (any functionally dependent value). If I remember right, the transverse Poissons ratio is internally always equal to 0.5 for implicit simulations.

The most appropriate transverse stiffness value will be dependent on what mateiral you are interested in.

-Jorgen

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Posts: 8
(@akbari)
Active Member
Joined: 15 years ago

can you kindly give some guidance on how to define the transverse shear stiffness in VUMAT as a functionally dependant variable for the mooney rivlin material model,

thanks

Nepolean

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Posts: 3998
(@jorgen)
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Joined: 4 years ago

I dont quite follow. You dont need to define the transverse shear stiffness in a VUMAT.

-Jorgen

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Posts: 8
(@akbari)
Active Member
Joined: 15 years ago

in your previous post u have mentioned ,

...... or as part of the VUMAT (any functionally dependent value...

So I thought there might be some way of describing in VUMAT.

I went thorugh the ABAQUS manual, they have brief explanation and gave an example of Linear, elastic, orthotropic material.

my case is an Hyperelastic material. as of now i am taking an approximation of 5/6*G*thickness.

will this is be a good approximation ?

thanks

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Posts: 3998
(@jorgen)
Member
Joined: 4 years ago

That sounds good to me.

-Jorgen

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Posts: 8
(@akbari)
Active Member
Joined: 15 years ago

Thanks for your feedback

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