In a laboratory test of a beam loaded by end couples, the fiber at layer AB as shown are found to increase 50 x 10 3 mm while those at CD decrease 70 x 10 ³ mm in the 210-mm-gage length. Using E = 150 GPa, determine the flexural stress at the bottom fiber. Answer must be in MPa. Given: a = 50 mm, b = 120 mm, and c = 80 mm.

Two polymer bars are connected to a rigid plate at B, as shown. Bar (1) has a cross-sectional area of 1.2 in.2 and an elastic modulus of 1820 ksi. Bar (2) has a cross-sectional area of 1.185 in.2 and an elastic modulus of 3590 ksi. Assume L1=21 in., L2=48 in., Q=7.6 kips, P=2.6 kips, and R=12.8 kips. Determine the horizontal deflection of end C relative to end A.

Problem 2 For the beam shown in the figure A) Draw the shear-force and bending-moment diagrams for the beam shown in the figure. B) For the composite section, aluminium [E = 70 GPa] bonded to a steel [E = 210 GPa], located at the maximum bending moment, determine: (1) the maximum bending stresses in the aluminium and steel bars. (2) the stress in the two materials at the joint where they are bonded together. K4N/M 2m B 10kN/mm 4m 2m D Steel Aluminum 42mm 20 mm 13 mm

Question 1: The piece of plastic is originally rectangular. Given LCD and LAD are 400 and 300 mm, respectively. If the plastic distorts as shown by the dashed lines, a) Determine the average normal strain that occurs along CD. b) Determine the average normal strain that occurs along AD. c) Determine the shear strain Yxy at corner C. 2 mm LCD 2 mm D LAD mm B 12 mm 3 mm mm