Major refactoring: replace material state cache with compositional
workspace using NamedTuple fields for better flexibility and zero-allocation.
- Rename MaterialStateCache to AssemblyMaterialWorkspace
- Change from M<:AbstractMaterialState to FieldType, StateType parameters
- Use AoS pattern: fields::Vector{FieldType} instead of separate σ, 𝔻 vectors
- Add zero-allocation field access via @generated functions
- Add extract_tangent! for type-stable zero-allocation tangent extraction
- Add get_tangent_vector, get_stress_vector helper functions
- Add @field_vector macro for compile-time field access
- Add get_stress, get_tangent, get_field accessor functions
- Update reset! to use create_zero_field and create_zero_state
- Update create_material_cache to use trait system for type inference
- Add backward compatibility alias create_assembly_workspace
- Add extensive documentation for zero-allocation usage patterns
New file: src/assemblers/material_cache.jl (247 lines)
Features:
- Parametric MaterialStateCache{StateType}
- Stores stress tensors (σ)
- Stores tangent modulus tensors (𝔻)
- Stores material state history (state, state_new)
- update_material_cache! function
State management:
- EmptyState for stateless materials (LinearElastic)
- Custom state types for plasticity (J2PlasticityState, etc.)
- State evolution tracked across load increments
Type parameter:
- StateType: Material state type (EmptyState, J2PlasticityState, etc.)
- Enables type-stable state access
Also includes ImmutableMaterialStateCache for read-only views
with @inline accessor functions.
Jukka Aho