Error in elPlastic element.

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Kimia Mortezaei

Kimia Mortezaei

June 26, 2013 10:12pm UTC

Error in elPlastic element.

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.

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Lado Filipovic

Lado Filipovic

October 21, 2014 1:44pm UTC in response to Kimia Mortezaei

Re: Error in elPlastic element.

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.

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Nagi Elabbasi

Nagi Elabbasi
Certified Consultant
Veryst Engineering

October 23, 2014 1:35pm UTC in response to Lado Filipovic

Re: Error in elPlastic element.

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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