Combined isotropic hardening¶

Overview¶

This object combines several isotropic hardening models into a single effective value of the isotropic hardening variable. The isotropic hardening variable is defined as

$Q=\sum_{i=1}^{n}Q_{i}\left(\alpha\right).$

That is, it calls each individual isotropic hardening function in a list and sums the results.

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
`rules`	`std::vector<neml::IsotropicHardeningRule>`	List of hardening models	No

Class description¶

class CombinedIsotropicHardeningRule : public neml::IsotropicHardeningRule ¶

Combined hardening rule superimposing a bunch of separate ones.

Public Functions

CombinedIsotropicHardeningRule(ParameterSet &params)¶: Parameter is a vector of isotropic hardening rules.

virtual void q(const double *const alpha, double T, double *const qv) const¶: q = Sum(q_i(alpha))

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

size_t nrules() const¶: Getter on the number of combined rules.

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.