Before revision: Schmid's Law states that the critically resolved shear stress (τ) is equal to the stress applied to the material (σ) multiplied by the cosine of the angle with the glide plane (Φ ) and the cosine of the angle with the glide direction (λ).
After revision: Schmid's Law states that the critically resolved shear stress (τ) is equal to the stress applied to the material (σ) multiplied by the cosiΦ ) and the cosine of the angle with the glide direction (λ).