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optimization error

Posted 1 feb 2018, 21:47 GMT-5 Structural & Acoustics 0 Replies

DoWon Heo
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Hi

I try to use optimization tool

but I get the error message as below.

Failed to find a solution for all parameters,

even when using the minimum parameter step.

The computed plastic multiplier is negative.

Geometry: geom1, Domains: 7-19

Failed to evaluate variable.

Variable: comp1.solid.Fiil33, Defined as: comp1.solid.Fpi33

Failed to evaluate variable.

Variable: comp1.solid.Ji, Defined as: 1/(comp1.solid.Fiil33((comp1.solid.Fiil11comp1.solid.Fiil22)-(comp1.solid.Fiil12*comp1.solid.Fiil21)))

Failed to evaluate variable.

Variable: comp1.solid.Sl22, Defined as: comp1.solid.Ji((comp1.solid.Fiil21(((((comp1.solid.D11comp1.solid.eel11)+(comp1.solid.D12comp1.solid.eel22))+(comp1.solid.D13comp1.solid.eel33))comp1.solid.Fiil21)+(comp1.solid.eel12(comp1.solid.D44(2comp1.solid.Fiil22)))))+(comp1.solid.Fiil22((comp1.solid.eel12(comp1.solid.D44(2comp1.solid.Fiil21)))+((((comp1.solid.eel11comp1.solid.D12)+(comp1.solid.eel22comp1.solid.D22))+(comp1.solid.eel33comp1.solid.D23))*comp1.solid.Fiil22))))

Failed to evaluate expression.

Expression: d(((-comp1.solid.Sl11test(comp1.solid.el11)-2comp1.solid.Sl12test(comp1.solid.el12)-2comp1.solid.Sl13test(comp1.solid.el13)-comp1.solid.Sl22test(comp1.solid.el22)-2comp1.solid.Sl23test(comp1.solid.el23)-comp1.solid.Sl33test(comp1.solid.el33))comp1.solid.d)*(dvol),{test3})

Failed to evaluate Jacobian of expression.

Expression: ((-comp1.solid.Sl11test(comp1.solid.el11)-2comp1.solid.Sl12test(comp1.solid.el12)-2comp1.solid.Sl13test(comp1.solid.el13)-comp1.solid.Sl22test(comp1.solid.el22)-2comp1.solid.Sl23test(comp1.solid.el23)-comp1.solid.Sl33test(comp1.solid.el33))comp1.solid.d)*(dvol)

Returned solution is not converged.

how can I modify the model?

Thank you

0 Replies Last Post 1 feb 2018, 21:47 GMT-5
COMSOL Moderator

Hello DoWon Heo

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