Question

L2 ty B D3 PI P2 E 7 CROSS-SECTION / 7 CROSS SECTION L2 FI C Ros5-SECTION F1 4.8 (N/mm) L1 (mm) L2 (mm) L3 (mm) P1 (mm) P2 (mm) D2 (mm) D3 (mm) 172 255 172 12.2 13.8 20.8 21.8 (a) Draw shear and moment diagrams for each of the 3 segments of the pedal-crank (b) Determine maximum bending stress and maximum torsional shear stress at key locations of this pedal-crank (c) What are the maximum principal normal stresses, and where are they located. Consider this question in two ways: (b1) Maximum individual principal stress, (o1 (b2) Maximum difference, ( o1-02) (d) What are the principal shear stresses at these locations A

Answer 1

Rc 4 N/mm -L,255 2= 172 mゅー Rel RB t F.) S.F)marn Mm 25'.6 X 255 1059 Nm RD 0 Cfre enef Re= Fl=48メ12 = 856 Mp Cfree enl) Mouimum benong stress For the Shaff BC is , , TTd 82x 21052 CsssechOn, P,xf, = 12-2 x 13. Due to looel F. there is torslonal Lool on he shaft B.C FixLI T Notel gn shaft CD , thme is no toys/on, theroye there ts h sheav stress (foysiohH dev eteped osh ofj 2 KL2 2 4. X 12 300. Nm T L2172 Torstenel Shear Stress fr the clrcular MA = 4.3 x172 55 14137 MBM 1doj.b a-Mun 9laaltx91- 2く = 4.13 N/M Principal Stresses af ghe maxsmum looding porht 7 N 9.639 N Mr Shaff B-At 8, T 23,3, - A0.83 M (825.6XI2) 213004.y N-nm てman = 125.143 M/mm Shoff A- At A, or-i0q.42,C- 97.02 T197370 Nma (Torque aiagram). てmoe E =142-87 Nmと 32X310. g04. 42 /m»" a32M 16x197330. = 97.02 N/m TXRL83 て 16