Isotropic hardening

The IsotropicHardening class manages all isotropic hardening laws in Metafor. The laws developed for thixotropic materials are are described below.

ShimaOyaneIsotropicHardening

Description

Isotropic hardening, specific for thixotropic materials. Shima and Oyane extended laws, only taking one internal parameter into account, the [doc:user:elements:volumes:thixo_scheilliquidfractionmatlaw|liquid fraction]], either full ($ f_l $ if SSIH_EFF = 0) or effective: ($ f_l^{eff} if SSIH_EFF = 1) .

$$ \sigma_{vm} = \sigma_{vm}^{sol} (1-f_l)^{h_2} $$

where $$ \sigma_{vm}^{sol} $$ is the yield stress for the solid phase, computed using any isotropic hardening law.

Parameters

Name	Metafor Code	Dependency
Number of the isotropic hardening law	`SSIH_NUM`	`TM/TO`
Shima et Oyane parameter $h_2 $	`SSIH_H2`	`TM/TO`
Use of full or effective liquid fraction	`SSIH_EFF`	`/`

Careful: Only works if used with thixotropic materials (ThixoEvpIsoHHypoMaterial or ThixoTmEvpIsoHHypoMaterial).