Freely-Jointed Chain
End-to-end: ⟨r²⟩ = Nb²
Entropic force: F = (nkT/b)·L⁻¹(r/Nb)
where L⁻¹ is inverse Langevin
Neo-Hookean: σ = νkT(λ−1/λ²)
Mooney-Rivlin adds C₂/λ term
Gent: diverges at λ→λₘ
End-to-end: ⟨r²⟩ = Nb²
Entropic force: F = (nkT/b)·L⁻¹(r/Nb)
where L⁻¹ is inverse Langevin
Neo-Hookean: σ = νkT(λ−1/λ²)
Mooney-Rivlin adds C₂/λ term
Gent: diverges at λ→λₘ