1. THERMAL STRESSES IN COMPOSITE MATERIALS Zdeněk Padovec

2. ΔTΔT αΔT σ/E [T][T]

3. Forces and moments resultants Can be rewritten

5. EXERCISE compute the thermal strains and stresses for a two-lamina laminate with angle orientation Φ = ± 55°, t 1 = t 2 = 0,635 mm, E L = 19 081 MPa, E T = 11 389 MPa, G LT = 3 789 MPa, ν LT = 0,274. Laminate is cooled down to room temperature 21°C from its processing temperature 121°C, α L = 8,42·10 -6 °C -1, α T = 29,8·10 -6 °C -1 SOLUTION computation of A, B, D matrices

6. 55°-55° 22,77 15,45 -20,120,1

8. PlyFace 2 (-55°)Top-2,27-1,44-2,94 2 (-55°)Bottom-2,27-1,440 1 (55°)Top-2,27-1,440 1 (55°)Bottom-2,27-1,442,94

9. EXERCISE compute the thermal strains and stresses for a two-lamina laminate with angle orientation Φ = ± 55°, t 1 = t 2 = 0,635 mm, E L = 19 081 MPa, E T = 11 389 MPa, G LT = 3 789 MPa, ν LT = 0,274. Laminate is cooled down to room temperature 21°C from its processing temperature 121°C, α L = 8,42·10 -6 °C -1, α T = 29,8·10 -6 °C -1 SOLUTION computation of thermal stresses PlyFace 2 (-55°)Top1,794,41-6,11 2 (-55°)Bottom-1,79-4,4112,2 1 (55°)Top-1,79-4,41-12,2 1 (55°)Bottom1,794,416,11