materiaalfunctie
Materiaalfunctie, commonly referred to in English as a material function, is a constitutive relation in continuum mechanics that describes how a material responds to external stimuli. It links state variables such as stress, strain, temperature, loading rate, and internal variables related to the material’s microstructure. The function serves to close the balance equations that govern motion, deformation, and heat transfer, allowing predictions of how a material will behave under given conditions.
Constitutive models can be explicit, expressing stress directly as a function of strain (and possibly strain
Material functions can be local, depending only on the current state, or nonlocal, incorporating spatial interactions.
See also: constitutive model, material property, continuum mechanics, plasticity, viscoelasticity.