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Boundary condition at interface of two different materials in structural analysis module
Posted 23 feb 2013, 01:35 GMT-5 Version 3.5a 1 Reply
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Hi,
I am trying to simulate a structural mechanics problem that utilizes 3D solid stress-strain module. I have a square plate of elastomeric material having a thikness in micro meteres and on top of this elastomeric substrate I have a metalic pattern having length in cm and thickness and width in micro meters. I want to know what B.C I should use on the interconnect face that is directly in contact with the surface of the substrate. Actually there are two options free and fixed since there are no continuity conditions on interfacial boundaries in structural mechanics module.
I shall be obliged if any one can give some guidance over this issue.
Thanks
I am trying to simulate a structural mechanics problem that utilizes 3D solid stress-strain module. I have a square plate of elastomeric material having a thikness in micro meteres and on top of this elastomeric substrate I have a metalic pattern having length in cm and thickness and width in micro meters. I want to know what B.C I should use on the interconnect face that is directly in contact with the surface of the substrate. Actually there are two options free and fixed since there are no continuity conditions on interfacial boundaries in structural mechanics module.
I shall be obliged if any one can give some guidance over this issue.
Thanks
1 Reply Last Post 23 feb 2013, 07:38 GMT-5
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Posted:
1 decade ago
Hi
I'm not sure I fully understand, but by default, in geometrical union mode, two domains (sub-domains in 3.5) in mutual contact with a common boundary have continuity BC conditions across the common boundary.
Now in geometry assembly mode, this common boundary is dedoubled, one attached to each domain, and by default there is NO flux passing from one domain to the other, yiu need to define the physics in between, this can be identity pairs wih continuity, contact pairs or pairs with specific physics (COMSOl has some, you can define your own PDEs at will.
In v4, there are many more "surface" physics incuded in the standard GUI, so for these you do not even need the "asembly mode" COMSOL looks after and overides the defalt continuity law and adds its own up/down link with the appropriate physics
--
Good luck
Ivar
I'm not sure I fully understand, but by default, in geometrical union mode, two domains (sub-domains in 3.5) in mutual contact with a common boundary have continuity BC conditions across the common boundary.
Now in geometry assembly mode, this common boundary is dedoubled, one attached to each domain, and by default there is NO flux passing from one domain to the other, yiu need to define the physics in between, this can be identity pairs wih continuity, contact pairs or pairs with specific physics (COMSOl has some, you can define your own PDEs at will.
In v4, there are many more "surface" physics incuded in the standard GUI, so for these you do not even need the "asembly mode" COMSOL looks after and overides the defalt continuity law and adds its own up/down link with the appropriate physics
--
Good luck
Ivar