FEA of Mountain Bike Frame by: Alfred Munoz

Outline Forces from static load (case1) Results (disscusion)

Forces from static case 1 Material is CU92 aluminum

Forces from static case 1 Weight Distribution 70 percent 30 percent

Forces from static case 1 (71) X-comp Y-comp TT=117343.2 Nmm (Torque at top) TB =101717.336Nmm (Torque at bottom) 378.5 N 130.34 N TB TT y 30 percent of 300lb 400.35 N X

Forces from static case 1 (72) D=860mm y x 70 percent 300 lbs(1334.5 N) equals 934.15 N X-comp=705.01N Y-comp=612.86 N

Forces from static case 1 X-comp=1269.18 N Y-comp=412.38 N D=203mm Force from a 300 lb rider (1334.5 N) y x

Results of FEA

Results of FEA Areas of concern

Results of FEA

Results of FEA Less stress in the middle Therefore room for optimization of material thickness

Results of FEA Results of frame

Area of symetrical stress on the top tube FEA Results Area of symetrical stress on the top tube

Future work Apply FEA with entire frame Run more cases with dynamic loading Model tubes of frame with varying cross-section (thinner in darker blue areas) Add welding at contacts and add gussets Perform corrections to Pro-E model with the cross-section removed from the places where the tubes intersect

Questions