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displacement discontinuity boundary condition

Posted 28 ago 2012, 12:03 GMT-4 Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 5.0 1 Reply

Kaj Johnson
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Is it possible to impose a displacement discontinuity boundary condition on an 'assembly' boundary between two domains? For example, I have two elastic regions in contact with each other. I want to prescribe a known discontinuity in the displacement field across this boundary. This is a common problem in solid mechanics (dislocations). I see that I can impose a 'Prescribed Displacement' on each side of an assembly boundary and this would allow me to introduce fixed displacements on each side of the boundary, producing a discontinuity in the displacement field. However, this prescribed displacement on each side is in a global coordinate system. What I really need to prescribe is not the absolute, global displacement vector on each side of the boundary, but the difference in displacement vectors across a boundary (or rather, the displacement of one side relative to the other). The absolute, global displacement of each side of the boundary is then part of the solution -- not prescribed.
1 Reply Last Post 26 mar 2015, 19:22 GMT-4
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Hello Kaj Johnson

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Tony Freeman
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Posted: 10 years ago 26 mar 2015, 19:22 GMT-4
Hi Kaj. Have you found an answer to this question? I think what you are suggesting might be a good way to simulate a hydraulic fracture where an internal boundary parts in two (when stress reaches zero/tensile) and each side of the boundary move opposite direction to a distance equal to fracture aperture. Do you think "Contact Pairs" option could be used for this application?

Tony
Hi Kaj. Have you found an answer to this question? I think what you are suggesting might be a good way to simulate a hydraulic fracture where an internal boundary parts in two (when stress reaches zero/tensile) and each side of the boundary move opposite direction to a distance equal to fracture aperture. Do you think "Contact Pairs" option could be used for this application? Tony

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