A composite section contains four different materials. The stresses in all the different materials will be:

Explanation:

In a composite section containing different materials, the stress distribution is dependent on the material properties, primarily the modulus of elasticity (E) and not just the area.

Additional Information

• Stress (σ) is calculated as σ=P/A​, but for composite sections, the deformation compatibility must be satisfied, meaning the strain in each material will be the same.
• Since $\sigma =E\cdot ϵ$, the stress in each material will vary based on its modulus of elasticity.
• Materials with a higher modulus of elasticity will experience higher stress compared to those with a lower modulus, even under the same strain.

Thus, the stresses in the four different materials will be different because they depend on their respective elastic properties, not just the areas.