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Presentation on the design of the frame for a SCCA Formula 1000 car. Includes stress and displacement plot for various impact scenarios.
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Formula 1000 Frame Design
Kimo “Kokonuts” SpectorDavid “Deuce” McMahonMatthew “McLovin” DiasioTomas “T-Bird” Lafferriere
Daniel “Fat Dan” Rist
Formula 1000 Class
Closest amateur competition to Formula One
Single-person, Open-wheel, Open-cockpit design
Powered by a 1000cc motorcycle engine
Chassis must be made of steel Minimum racing weight of 1000 lbs. Governed by the SCCA (Sports Car
Club of America)
Chassis Design
Monocoque design were used through 1950’s
Space Frame began growing in popularity in late 1960’s
Space Frame a low cost, lightweight, easy to maintain chassis
Now used mainly in Amateur Racing
Our Chassis
Steel tube space frame design Tube size specified by SCCA rulebook
(AISI 4130) Raised nose design for improved
aerodynamics Allows for the use of a full width wing
Comprised of Pratt & Town’s lattice trusses
3D Frame Model
Cost of Materials
AISI 4130 is standard material for automotive frames
Approximately $8 per foot SolidWorks gives frame volume
Need to find length Divided volume by cross-sectional area
of tube 177.8 ft of tube = $1,422.40 per
chassis
Other Cost Factors
Welding $75 per hour 40 man-hours to complete $3000 for labor per chassis
Worst-case scenario: need 12 frames a year Assume that team orders 185 ft of tube
per chassis (materials cost $1,480 per chassis)
$53,760 to make 12 chassis a year
Testing Parameters
First test was simulated rollover onto main hoop
Other tests simulated impact with another F1000 car from various angles
Weight assumed to be minimized to 1000 lbs
Speed of 60 mph consistent with corner exit speed of a F1000 car
Used a collision time of 0.1 seconds Used time derivative change in momentum
to calculate equivalent force
Inconsistencies
Simulates direct impact on frame Body would absorb some of impact
Used fixed geometry restraints at wheel attachments Impacts would cause the car to slide Sliding would dissipate a great deal of the
energy from the impact. Also assumes velocity of impacting car
goes to zero, absolute worst case scenarios
Simulation Analysis
Roll-bar test required by SCCA Frame experiences maximum
displacement of .0855 in.
Stress Analysis
Impact at cross point of cabin truss results in most displacement
6.664 in. of predicted displacement All other tests result in less than 1.6
in. of displacement
Stress Analysis
Simulated front impact by removing first four fixed supports
Deformation of less than an inch