Thermal Expansion

ΔL = α·L·ΔT. If the part is fully constrained it can't grow, so the strain turns into stress: σ = E·α·ΔT. α values (µm/m·°C) come from the material reference.

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Area & volume growth

Area expands at ≈ 2α·ΔT, volume at ≈ 3α·ΔT (using the same α and ΔT as above).