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modeling glue stiffness with cosmos
Steven Dinsdale Sep 10, 2008 2:23 PM (in response to Loic Ancian)You could try to use Loads/Restraints > connectors > spring.
I have never used it so I do not know how it works.
Steven 
modeling glue stiffness with cosmos
19411 Sep 11, 2008 9:16 PM (in response to Loic Ancian)loic,
Make a model with the just a thickness of the glue. Apply your modulus of elasticity. Use a fix boundary condition on one side and a force on the other side. run the model and look at the displacement in the direction of the thickness. Now you know the force, displacement, and surface area.
Stiffness=(Force/displacement)/(Surface Area)
Check the units. This works.
I will try to find (or derive) the formula that relates Modulus of Elasticity to a spring constant for a uniaxial tension test.

modeling glue stiffness with cosmos
Bill McEachern Sep 11, 2008 10:17 PM (in response to 19411)stress= load/area=Youngs mod * strain= youngs mod*delta L/L


modeling glue stiffness with cosmos
Loic Ancian Sep 12, 2008 10:29 AM (in response to Loic Ancian)Hi,
thanks for your help.
In my case I have 2 different stiffnesses for my glue. One is in compression/traction, and the other is in shear.
Can I still apply formula below even in shear mode?
stress= load/area=Youngs mod * strain= youngs mod*delta L/L
Loïc

modeling glue stiffness with cosmos
Bill McEachern Sep 12, 2008 10:47 AM (in response to Loic Ancian)you need the equivalent shear relations


modeling glue stiffness with cosmos
Loic Ancian Sep 12, 2008 1:11 PM (in response to Loic Ancian)OK, that's what I was going to use.
thanks again.