2. Poisson’s ratio. Maximum value 0.5 or when subject to hydrostatic stresses the volume will increase.

3. Starting from the generalized Hook’s law, how would you include the thermal expansion effect into the relations? (2 points)

5. Reaction forces in C&D (2 point)

6. Forces in all truss members indicating whether it is tension or compression (2 points)

8. Calculate the loads (reactions) at the point B (2 points)

10. IF the support at B does not exist, the load in section AD, DC, CK, and KB

11. (2 points)

12. The stresses in each section (2 points)

13. The deflection of points D, C, K, and B (2 points)

15. 900/250=3.6 kN/mm2

16. 600/250=2.4 kN/mm2

18. Δ=P0.3400*10-6*71*109+0.3300*10-6*71*109=P1.1*10-8+1.4*10-8=2.5*10-8P

19. RB=P=0.01592.5*10-8=636 kN

20. For the bar shown in the figure below, (E=71 GPa, α=23x10-6 oC-1):

22. Calculate the stress in AC and CB (2 points)

24. 100 * 23 x 10-6 * 250 + 0.35 = 0.58 + 0.35 = 0.93 mm

25. Deflection due to load P at B is:

26. Δ=P0.25300*10-6*71*109+0.15500*10-6*71*109=P1.2*10-8+0.4*10-8=1.6*10-8P

27. RB=P=0.000931.6*10-8=58 kN

28. 58000 / 500 * 1000 * 1000 = 116 MPa

29. 58000 / 300 * 1000 * 1000 = 193 MPaΔC=0.0035-58000*0.15500*10-6*71*109=0.0035-0.00025=0.0033 mm to the right<br />