estimate of MNPRES(Minimum pressure at failure)

[Amir]

hello

how could I estimate the MNPRES(Minimum pressure at failure) for eroding the elements?

notes:

-I am using MAT_ADD_EROSION->MNPRES to erode the polyurethane foam elements in the simulation.

-I have the stress-strain curve of the foam

Thank you

[James M. Kennedy]

Dear Amir,

 

See if this helps:

 

The simulation of the quasi static compression test was successfully performed using LS-DYNA. LS-DYNA provides many material models for different types of foams. However, based on previous work by Ozturk and Anlas [2011], the best candidate for modeling EPS crushable foam was *MAT_063 (*MAT_CRUSHABLE_FOAM). This material model requires the input of five parameters: density of material, modulus of elasticity, Poisson’s ratio, stress strain curve, tensile stress cutoff, and damping coefficient:

 

Shah, Q.M., and Topa, A., "Modeling Large Deformation and Failure of Expanded Polystyrene Crushable Foam Using LS-DYNA", Modelling and Simulation in Engineering, Vol. 2014, Article ID 292647, 7 pages, January, 2014.

http://www.hindawi.com/journals/mse/2014/292647/

 

Sincerely,

James M. Kennedy

KBS2 Inc.

December 6, 2021

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