General Mechanical

General Mechanical

Interface Delamination – Odd Behavior and Questions

    • jacobengland16
      Subscriber
      Hey all, nI'm currently running some simulations that utilize interface delamination to model an adhesive. I chose interface delamination so I could alter the ratio, which indirectly controls the stiffness of the elastic region. nI'm noticing some odd behavior. When I utilize interface delamination, and a bonded contact between the two bodies, the ratio seems to have no effect on the slope of the force/deflection graph. The lines are on top each other. I read another question on the forum which suggested that that the bonded contact should be suppressed for an interface delamination simulation, otherwise, there will not be separation. However, it appears that the bodies are still separating from each other, even with a bonded contact being utilized. nOnce I suppress the contact, the ratio does seem to have some effect on the slope, however it's not as much change as I expected. It's probably about a .1mm change between the peak loads (.15 and .7 for the ratios). nTLDR; nShould the bonded contact between the two bodies be suppressed when utilizing interface delamination? If not, why am I not noticing any change? nIf it would be helpful to see my simulation, let me know and I can attach a simplified version, but I'm trying to keep that private for confidentiality reasons.Thanks in advance!n
    • 1shan
      Ansys Employee
      HelloArray,nWhen we use interface delamination with CZM, the approach uses zero-thickness cohesive elements and this element has some stiffness. Therefore no contact is needed(suppress contact). If you want to utilize contacts then use 'interface debonding' model which utilizes contact elements. You could try changing both the ratio as well as the maximum traction/sigma_max value to see if you find any difference. Check this discussionhttps://forum.ansys.com/discussion/15589/structural-analysis-cohesive-zone.nThese links could help - n1)https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v195/ans_mat/cozonemats.html?q=cohesive%20zone%20materialn2)https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v194/ans_thry/thy_mat11.htmlnRegards,Ishan.nhttps://forum.ansys.com/discussion/3978/how-to-access-the-ansys-online-helpn
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