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Error in elPlastic element.

Kimia Mortezaei
Hello
I ran a geomechanical model and I got this Error "Error in elPlastic element. - Detail: Lambda non positive for plastic point" , Could anyone tell me why this error happens. I used soil plasticity model.

2 Replies Last Post 23/10/2014, 09:35 GMT-04:00
COMSOL Moderator

Hello Kimia Mortezaei

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Lado Filipovic
Posted: 3 years ago 21/10/2014, 09:44 GMT-04:00
Hi Kimia,
have you managed to solve this problem? I seem to be getting this as well when using the Linear Elastic Material model where one material has plasticity. When the generated stress reaches the initial yield stress, I get this error.

Any help would be appreciated.
Hi Kimia, have you managed to solve this problem? I seem to be getting this as well when using the Linear Elastic Material model where one material has plasticity. When the generated stress reaches the initial yield stress, I get this error. Any help would be appreciated.

Nagi Elabbasi Certified Consultant
Posted: 3 years ago 23/10/2014, 09:35 GMT-04:00
This “Lambda” is used to calculate the amount of plastic strain such that the stress remains on the yield surface. I have seen this error when the time step size (or load increment in stationary analysis) is too big, or when convergence tolerances are too loose.

Nagi Elabbasi
Veryst Engineering
This “Lambda” is used to calculate the amount of plastic strain such that the stress remains on the yield surface. I have seen this error when the time step size (or load increment in stationary analysis) is too big, or when convergence tolerances are too loose. Nagi Elabbasi Veryst Engineering

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