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- Compressible Neo-Hookean strain energy function - Automatic differentiation for stress and tangent computation - Dual constructor: Lamé (μ,λ) or engineering (E,ν) - Total Lagrangian formulation with 2nd Piola-Kirchhoff stress - Zero-allocation AD via Tensors.jl - When to use: rubber, large deformation, contact mechanics - 571 lines: Complete AD-based material model documentation