mechanical engineer

Question 9 11 pointe A seat bracket assembly is shown in the following figure. The load varies from 1050 N to 250 N as passengers enter and ext the bus. Determine the following Mean stress om b. Alternating stress o c. Stress ratio R = Load on bracket D B D A B. 250 mm 500 mm 50 mm Section D-D ww in stress om mating stress 0,= ess ratio R = Loa 70.00 16.67 43.33 26.67 52.50 39.5 0.238 0.615 0.386 4.199 86.66 53.33 93.33 35.55 22.22 57.77 A List of formullas: 0 to max min o = 2 a mar - 0 min = 2 2 o min R = o mat Moment (M) = force x distance Mc Bending stress o 1 bh Rectangular cross section / 12