THE WOOD BEAM BIKE

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THE WOOD BEAM BIKE
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Brad Cox Ara
AbnousJay Macaraeg
John Stork

• MOUNTAIN BIKES

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Brad Cox Ara
AbnousJay Macaraeg
John Stork

• What is a mountain bike
• Why we chose mountain bikes
• Who are target consumer is
• Stress analysis
• Joining and fabrication
• Cost analysis
• Final product w/ competitor comparisons

• MOUNTAIN BIKES

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• MOUNTAIN BIKES

What is a Mountain Bike?
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What is a Mountain Bike?
Expectations

• Suspension travel
• Good Breaks
• Durability
• Lightweight without
• sacrificing strength
• Minimal pedal bobbing

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Target Consumer
Expectations

• Suspension travel
• Good Breaks
• Durability
• Lightweight without
• sacrificing strength
• Minimal pedal bobbing

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Joining

• Welding

Using Lugs
Brazing
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Welding

• TIG welding
• Works great on thin materials (i.e. Tubing)
• Provides high quality welds
• Used my most bike frame manufacturers
• Costs less than brazing/lugs combination
• Adds approximately 1/3 the amount of material on
  a bike than brazing/lugs combination

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Fabrication

• Pipes will be extruded and
• welded to make the frame
• Components (i.e. seats, tires,
• shocks, etc.) will be purchased
• from manufacturers
• Frame can be either powder
• coated or anodized (costs more)

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Pros Cons of Materials Selected

• Aluminum
• Design strengths
• High strength-to-weight ratio
• High stiffness-to-weight ratio
• High electrical and thermal conductivity
• Easy to shape
• Easy to recycle
• Design weaknesses
• Difficult to arc weld

• Titanium
• - Design strengths
• - High strength, even at high temperatures
• - High stiffness
• - Chemically inert in body
• - Design weaknesses
• - High cost
• - Chemically very reactive when hot
• - Quite difficult to shape - usually cast

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Aluminum 7075 Heat Treated Tensile Yield
Strength 73 kpsi Ultimate Tensile
Strength 83 kpsi Elongation Over 2 in.
11 Modulus of Elasticity (E) 10.4
Mpsi Modulus of Rigidity (G) 3.9
Mpsi Poissons Ratio (v)
.34 Weight Density .10
lb/cubic in.
Material Properties

• Aluminum 6061 Heat Treated
• Tensile Yield Strength 40 kpsi
• Ultimate Tensile Strength 45 kpsi
• Elongation Over 2 in. 12
• Modulus of Elasticity (E) 10.4 Mpsi
• Modulus of Rigidity (G) 3.9 Mpsi
• Poissons Ratio (v) .34
• Weight Density .10 lb/cubic
  in.

Titanium Ti-6 Al-4 V Heat Treated Tensile Yield
Strength 165 kpsi Ultimate Tensile
Strength 175 kpsi Elongation Over 2 in.
12 Modulus of Elasticity (E) 16.5
Mpsi Modulus of Rigidity (G) 6.2
Mpsi Poissons Ratio (v)
.34 Weight Density .16
lb/cubic in.
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In order to find Guidelines for minimum mass
design for circular tubes, the following
equations were used.
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Critical Loading Scenario's
Horizontal Impact Vertical Jump Sitting
Vertical Jump Standing Front Wheel Landing
Rear Wheel Landing
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Horizontal Impact
170 lb
20 mph
30 lb
Rider 200 lb Force 1g
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All Circular Tubing Thickness 0.10in
Oval Top Bottom Tubes Thickness 0.10in Seat
Tube Thickness 0.125in
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6061T6
7075T6
FOS0.6
FOS1.0
Oval Top Bottom Tubes Thickness 0.10in Seat
Tube Thickness 0.125in
Materials before gusset
Ti-6
FOS2.2
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6061T6
7075T6
FOS1.1
FOS2.1
Gusset Added
Ti-6
FOS4.2
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270 lb
Vertical Standing
600 lb
180 lb
Rider 200 lb Force 3g
330 lb
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Too close to Sy
6061T6
7075T6
FOS1.2
FOS2.3
Ti-6
FOS4.6
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Vertical Sitting
180 lb
420 lb
600 lb
180 lb
Rider 200 lb Force 3g
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6061T6
7075T6
FOS2.3
FOS4.3
Ti-6
FOS9.1
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Front Wheel Landing
540 lb
Rider 200 lb Force 3g
60 lb
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6061T6
7075T6
FOS2.1
FOS3.9
Ti-6
FOS8.3
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Rear Wheel Landing
600 lb
Rider 200 lb Force 3g
600 lb
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6061T6
7075T6
FOS1.5
FOS2.7
Ti-6
FOS5.7
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600 lb
Lower Link
Upper Link
600 lb
600 lb
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FOS21.0
6061T6
FOS9.5
6061T6
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S-N Diagrams
Titanium
Aluminum
Horizontal impact
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Capable of 8 inch rear suspension
travel Framelinkage Weight 12.61 lbs Total
Weight After Parts
Virtual Pivot Point decrease pedal
bobbing absorb bumps while pedaling
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Cost Analysis

• Frame Tubing 130.00 (13 ft _at_
  10 per foot)
• Welding (TIG)
  100.00
• Anodizing 700.00
• Powdercoat 600.00
• Total Frame Cost 830.00 - 930.00
• All other Components 2000.00 - 3800.00
• (includes seat post, handle bars, shocks, front
  fork, brakes, wheels, pedals, gear chain
  assembly, and all other minor parts)
• Grand Total 2830.00 4730.00

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The Competition

• SantaCruz VP Free R Store
  Price
• 
  3636.99
• 
  
• Specialized Demo 9 Pro Store
  Price
• 5499.99
• 
  
  
  

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