Interpolated isotropic hardening

Overview

This object provides interpolated isotropic hardening as a function of the equivalent plastic strain. The isotropic hardening variable is defined as

$Q = -w(\alpha)$

for some interpolation function $w$ .

The model requires a single history variable ( $\alpha$ ) and maps to a single hardening variable ( $Q$ ).

Warning

All of the NEML yield surfaces assume the opposite of the standard sign convention for isotropic and kinematic hardening. The hardening model is expected to return a negative value of the isotropic hardening stress and a negative value of the backstress.

Parameters

Parameter	Object type	Description	Default
`flow`	`neml::Interpolate`	Interpolated flow stress	No

Class description

class InterpolatedIsotropicHardeningRule : public neml::IsotropicHardeningRule 

Isotropic hardening with flow stress from some interpolation function.

Public Functions

InterpolatedIsotropicHardeningRule(ParameterSet &params): Parameter is the interpolate to use.

virtual void q(const double *const alpha, double T, double *const qv) const: q = -interpolate(T)

virtual void dq_da(const double *const alpha, double T, double *const dqv) const: Derivative of the map.

Public Static Functions

static std::string type(): String type for the object system.

static std::unique_ptr<NEMLObject> initialize(ParameterSet &params): Initialize from a parameter set.

static ParameterSet parameters(): Default parameters.