linear and non-linear analysis

[Peppe21]

Hello everyone,
I am using workbench 13 for static analysis. By doing a linear analysis I have achieved voltage results considerably beyond the material yield limit and I would therefore proceed to a nonlinear analysis to assess the effects of plasticization of the material. using normal analysis the program continues even after ribbing (which is however set in the table of materials) to use the stress deformation curve of the linear tract right? using the module bilinear isotropic hardining it makes me set two modules of young one in the stretch and one after the ribbing it calls tangent module . the values of this tangent module how do they calculate? the value that defaults the common steel program (scructural steel) seems low.
Moreover when defining in geometry the type of material to attribute to each piece can also set linear or nonlinear analysis even without the module bilinear isotropic hardining. What exactly does this command do to the program? by chance allows to evaluate the fact that the material does not have the same rigidity during the application of the load but varies according to the deformation? If not, how can I assess this aspect?

I have very confused ideas.

 

[nicnoc]

the second elastic module concerns the slope of the plastic-incrusting tract. is a straight, just find the slope and you have your tangent module

 

[stefano.garbin]

module_tangente = (sigma_rottura - sigma_snervamento) / (epsilon_rottura - epsilon_snervamento)

where

epsilon_snervazione = sigma_snervazione / module_elastico

 

[Peppe21]

Thanks stefano! I needed the correlation with the characteristics of the material!