Saint Venant-Kirchoff

struct SaintVenantKirchhoff <: ConstitutiveModels.AbstractHyperelasticity

helmholtz_free_energy(
    _::SaintVenantKirchhoff,
    props,
    ∇u,
    θ
) -> Any

initialize_props(
    _::SaintVenantKirchhoff,
    inputs::Dict{String}
) -> Any