Jak vypočítat Thermal Stress
Co je Thermal Stress?
Thermal stress develops when temperature changes constrain material expansion. Critical in composite structures and multi-material assemblies.
Vzorec
Calculate: σ_th = E × α × ΔT where α is expansion coefficient
- E
- E value — Variable used in the calculation
Průvodce krok za krokem
- 1Calculate: σ_th = E × α × ΔT where α is expansion coefficient
- 2If constrained (cannot expand freely), stress develops
- 3Account for different materials with different expansions
Worked Examples
Vstup
Steel bar L=1m, ΔT=50K, α=12×10⁻⁶, E=200GPa, fully constrained
Výsledek
σ ≈ 120 MPa tensile stress
Significant stress
Common Mistakes to Avoid
- ✕Neglecting thermal stress in composite structures
- ✕Assuming small temperature changes are negligible
Frequently Asked Questions
Why do bridges have expansion joints?
To allow free expansion/contraction from temperature; otherwise excessive stress develops.
How do mismatched material expansions cause problems?
Different αbetween materials creates internal stress at interfaces that can cause cracking.
Jste připraveni počítat? Vyzkoušejte bezplatnou kalkulačku Thermal Stress
Zkuste to sami →