Question

11 Review Review Part A - Stress-concentration factor due to notches on the surface at point B Learning Goal: To determine the stress-concentration factors in a notched member with a nonuniform cross section that is subjected to a bending moment. The member ABCD shown below (Figure 1) is subjected to a bending moment. The member has a thickness of t = 30 mm, a full height of w = 35 mm, and a reduced height in two cross-sectional areas of h = 25 mm. The notches at point B are d = 10 mm in diameter and are indented on the member at a distance of b = 5 mm. The shoulder fillets at point C have a radius of r = 6 mm. The applied bending moment has a magnitude of M = 125 Nm The notches on the surface of the member point Bintroduce a stress-concentration factor into the equation for the stress in the member. What is this stress-concentration factor?(Figure 2) Express your answer to three significant figures. View Available Hint(s) IVO ALOJfvec ? K = Submit Part B - Stress-concentration factor due to shoulder fillets at point C The shoulder fillets at point C introduce a stress-concentration factor into the equation for the stress in the member. What is this stress-concentration factor?(Figure 3) Express your answer to three significant figures. Figure < 1 of 3 > View Available Hint(s) VOAD vec K = Submit kd Part C - Maximum bending stress in the member

Answer 1

: با Given data; t 30 mm; 35 mm, h = 25mm 10 mm besmom, dē 6 mm, 19 = 125 N.m. ds (shoulds part. A k at notch of poin B. = 5 ४ coplich soft els r c 0.2 25 dlza 10/2 ş b. h k = 105 from figure grien. stress Concentration facter due to notches the surface at poin B is Kolisi k x mc = k M notch = [hz] I th3 12 = 1.5 (125x103) (12.5) 30 (25) 12 75 mpe. Part+by. w 35 1) lou > 25 Jlo sle 0.24 pl 25 kr. 1.4 from figure

pert-c k [ Moda shoulder k meni) thi 12 -1.4 (1256103) (12.5) 30 (25J3 12 = 56 56 mpa Therefore, max = Iman { Trotch man & { 76 shoulder} 1 56 } impe man? 76 mpa Answers: poolt. A K 1.5 part B t 14 Dalt - 76 max Mpa