Question

Review Part A Determine the maximum normal stress in the bracket at section a-a when the F 78 kN load is applied at = 0. (Figure 1) Express your answer with the appropriate units. Enter negative value in the case of compression and positive value in the case of tension. 7 1A ww Value Units Previous Answers Request Answen Submit X Incorrect; Try Again; 3 attempts remaining Figure 1 of 1 Part B 0. Determine the minimum normal stress in the bracket at section a-a when the F 78 kN load is applied at 15 mm your answer with the appropriate units. Enter negative value in the case of compression and positive value in the case of tension 15 mm 200 mm m HA ? Value Units min Previous Answers Request Answer Submit

Answer 1

Drawing the FBD of the top cut segment a 'cut segment at a-a 181Naim EFy=0; N= 78kW E Mc20 7 8 (0-1) - M = 0 > M=7.8 KN-m мки Section properties: - A = 0-20.03 = 0.006 m2 I= 1 (0.03) (0-2) 3 = 20x156 m+ the houmal stress in the bracket will be the Combination of axial & bending Storens . os my At Left: a = - 78x103 0.006 - 708*10*x 0-1 20 x 100 L = -52 MPa At right edge fiber! R3 -78x103 + 1.813 7-8x10°xo 1 20 x 156 0.00 FR = 26 MPa - prax = 26 MPa] Coin = - 52 MPa]

Note- If you get these values incorrect, then please try by interchanging max and min values. Thank you!