ASSIGNMENT 5 
INDIVIDUAL PROJECT 3 
 
Assignment Date : 10 April, 2015                            Due Date : 24 April, 2015 
 
ASSIGNMENT ON USING FINITE ELEMENT SOFTWARE (TO BE DONE INDIVIDUALLY) 
 
This  project  is  concerned  with  design  of  a  bicycle  frame  using  aluminum  tubes.  The  schematic 
dimensions of the bicycle are shown below. The following two load cases should be considered. 
(a)  Vertical loads: When an adult rides the bike, the nominal load is estimated as a downward load 
of 900 N at the seat position and a load of 300 N at the pedal crank location. When a dynamic 
environment  is  simulated  using  the  static  analysis,  the  static  loads  are  often  multiplied  by  a 
dynamic load factor G. In this design project, use G = 2. Use ball‐joint boundary conditions for 
the front dropout (location 1) and sliding boundary conditions for the rear dropouts (location 5 
and 6). 
(b)  Horizontal impact: The frame should be able to withstand a horizontal load of 1000 N applied to 
the front dropout with rear dropouts constrained from any translational motion. For this load 
case, assume the front dropout can only move in the horizontal direction. Use G = 2. 
Choose aluminum tubes of various diameters for the various members of the frame shown in the 
figure such that the bicycle is as light as possible. The minimum outside diameter is 12 mm and the 
wall thickness is 2 mm. In addition to the dynamic load factor, use a safety factor of 1.5. Use failure 
stress criterion base on yielding. 
In your report, you must include the following for each load case: 
1.  For each member of the frame the maximum combined stress and the margin of safety (M.S.). 
2.  Nodal deflections at each joint should be given. 
3.  The weight of your frame. 
 
  Properties of Aluminum 
Material property  Value 
Young’s Modulus (E)  70 GPa 
Poisson’s Ratio (ν)  0.33 
Density (ρ)  2580 kg/m3
 
Yield Strength (σY)  210 MPa 
 
 
Assignment 5 ind_proj_3
Assignment 5 ind_proj_3
Assignment 5 ind_proj_3

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Assignment 5 ind_proj_3

  • 1. ASSIGNMENT 5  INDIVIDUAL PROJECT 3    Assignment Date : 10 April, 2015                            Due Date : 24 April, 2015    ASSIGNMENT ON USING FINITE ELEMENT SOFTWARE (TO BE DONE INDIVIDUALLY)    This  project  is  concerned  with  design  of  a  bicycle  frame  using  aluminum  tubes.  The  schematic  dimensions of the bicycle are shown below. The following two load cases should be considered.  (a)  Vertical loads: When an adult rides the bike, the nominal load is estimated as a downward load  of 900 N at the seat position and a load of 300 N at the pedal crank location. When a dynamic  environment  is  simulated  using  the  static  analysis,  the  static  loads  are  often  multiplied  by  a  dynamic load factor G. In this design project, use G = 2. Use ball‐joint boundary conditions for  the front dropout (location 1) and sliding boundary conditions for the rear dropouts (location 5  and 6).  (b)  Horizontal impact: The frame should be able to withstand a horizontal load of 1000 N applied to  the front dropout with rear dropouts constrained from any translational motion. For this load  case, assume the front dropout can only move in the horizontal direction. Use G = 2.  Choose aluminum tubes of various diameters for the various members of the frame shown in the  figure such that the bicycle is as light as possible. The minimum outside diameter is 12 mm and the  wall thickness is 2 mm. In addition to the dynamic load factor, use a safety factor of 1.5. Use failure  stress criterion base on yielding.  In your report, you must include the following for each load case:  1.  For each member of the frame the maximum combined stress and the margin of safety (M.S.).  2.  Nodal deflections at each joint should be given.  3.  The weight of your frame.      Properties of Aluminum  Material property  Value  Young’s Modulus (E)  70 GPa  Poisson’s Ratio (ν)  0.33  Density (ρ)  2580 kg/m3   Yield Strength (σY)  210 MPa