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- Tests LinearElastic material construction with parameter validation - Validates Lamé parameter computation (λ and μ from E and ν) - Stress computation tests: uniaxial extension, pure shear, hydrostatic pressure, general strain - Verifies Hooke's law: σ = λ·tr(ε)·I + 2μ·ε - Tangent modulus validation: 𝔻 = λ·I⊗I + 2μ·𝕀ˢʸᵐ (4th-order tensor) - Double contraction consistency: σ = 𝔻 ⊡ ε - Symmetry and isotropy property verification - Tests both full and simplified compute_stress() interfaces - Zero allocation and type stability checks - 279 lines validating fundamental elasticity operations with Tensors.jl