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SMC 4133 AUTOMOTIVE STRUCTURES PowerPoint Presentation

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SMC 4133 AUTOMOTIVE STRUCTURES

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SMC 4133 AUTOMOTIVE STRUCTURES

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  1. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS • The main function of the body structure is to protect occupants in a collision • There are many standard crash tests and functioning levels • For the The states, these standards are contained in Federal Motor Vehicle Safe • Standards (FMVSS) • They are FMVSS 208 (front), 214 (side), 301 (rear) and 216 (roof) All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

  2. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS • The insurance manufacture & consumer groups accept their ain examination standard to • evaluate vehicles beyond government standards • For example, the New Motorcar Cess Program (NCAP) • Information technology is based on the probability of injury; measured with a star rating where • the five stars point lower probability of injury and vice-versa All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Auto Body Construction Design, SAE International.

  3. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS FRONT BARRIER • Is a condition of a moving vehicle crashes onto a rigid bulwark at a forepart • Allow's model the frontal bear upon with a point mass t = 0 t = 0, dx/dt = V0 t = 0, 10 = 0 dx/dt = 0 Resulting beliefs of the point mass model The beat out efficiency factor is used to consider non-uniform crash forcefulness properties All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Car Trunk Structure Design, SAE International.

  4. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Example one Consider a vehicle of mass 1580kg impacting a rigid barrier at 55 km/h and average beat load of 300 kN. Calculate crash dispatch, deformation and fourth dimension. Acceleration = -300000/1580 = 189.87 m/south^2 = -19.4g time = 1580 10 55/(3.6 x 300000) = 0.0805s Deformation = -300000 x (0.0805^2)/(2 x 1580) + (55/3.6) ten 0.0805 = 0.614m All materials in this slide are taken from Donald East Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

  5. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS The vanquish efficiency factor is used to consider non-uniform crash strength backdrop • When crush gene approaching 1, it • indicates the lower the head injury • When designing the collapsed structure • of the motor compartment, it is desirable • to accept a square wave shape All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Auto Body Structure Pattern, SAE International.

  6. SMC 4133 AUTOMOTIVE STRUCTURES Blueprint FOR CRASHWORTHINESS Procedure for establishing Forepart torso structural requirements: Maximum allowable cabin decelerations based on occupant injury Consistent structural efficiency and beat infinite Average and maximum allowable vanquish forces Total shell forces to be used in the structural elements Shell forcefulness: 10% - hood & fender 20% - lower cradle fifty% - mid-rail 20% - top of fender The front elements are sized to ensure that the cabin zone won't exist intruded All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Motorcar Body Structure Design, SAE International.

  7. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Example 2 a) Determine the required vanquish space. The structure volition be fourscore% efficient and the commanded maximum deceleration is 20g. The impact speed is 48km/h. b) Compute the average full crush forcefulness with a vehicle mass of 1200kg and impact speed of 35 km/h. Solution: a) Shell space = (48/3.6)^2/(2*xx*nine.81*0.8) = 0.57m b) Crush force = 0.five*1200*(48/3.6)^2/0.57 = 187N All materials in this slide are taken from Donald Due east Malen. 2011. Fundamentals of Automobile Body Structure Blueprint, SAE International.

  8. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Axle section can exist determined Beam sizing • A thin-walled square section is subjected to an axial compressive load • As the compressive load is gradually increased, the elastic buckling load • is reached and the walls buckle • As the load increases farther and past the ultimate load, the walls section cripple • and the load drops All materials in this slide are taken from Donald Eastward Malen. 2011. Fundamentals of Car Torso Structure Design, SAE International.

  9. SMC 4133 AUTOMOTIVE STRUCTURES Blueprint FOR CRASHWORTHINESS Case three Each of motor compartment side rail must generate 25% of the trounce force F=300kN. A 100mm foursquare section is used. Discover the required thickness for yield stress of 207 MPa. Solution: Pm = 0.25*300000 = 75000N Pm = 386*t^1.86*100^0.14*207^0.57 = 75000 t^1.86 = four.88 t = 2.34mm All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Torso Structure Pattern, SAE International.

  10. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS • Motor compartment packaging typically • require flange location & section shapes All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Auto Torso Structure Design, SAE International.

  11. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Limit load analysis • Is the ultimate load-carrying ability for the structure • Is used to make up one's mind the failure load that crusade to initiation of permanent • deformation Plastic hinge model All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Machine Body Structure Design, SAE International.

  12. SMC 4133 AUTOMOTIVE STRUCTURES Pattern FOR CRASHWORTHINESS Model with small deflection All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Trunk Structure Pattern, SAE International.

  13. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Vehicle pitch during touch on • Some vehicles rotate/pitch upon crash with a fixed barrier • It can increase the possibility of neck injuries • To reduce pitching, crushable beam is introduced All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

  14. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Instance iv Fup = 100000* 100/(400) = 25kN All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Auto Torso Structure Design, SAE International.

  15. SMC 4133 AUTOMOTIVE STRUCTURES Design FOR CRASHWORTHINESS • Side touch on • Plays an important role in sizing vehicle structure • FMVSS requires a minimum injury functioning while NCAP uses star scale • The injury criterion is TTI index where the larger values indicate a more severe injury • TTI < 57 in desirable All materials in this slide are taken from Donald East Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

  16. SMC 4133 AUTOMOTIVE STRUCTURES Blueprint FOR CRASHWORTHINESS Kinematic and load path analysis Acceleration & fourth dimension Concluding velocity Distance traveled All materials in this slide are taken from Donald Eastward Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

  17. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Side – impact model Time at which the occupant hit the door All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

  18. SMC 4133 AUTOMOTIVE STRUCTURES DESIGN FOR CRASHWORTHINESS Rear touch on - To minimize fuel system from leakage Final speed Final speed Piece of work of deformation Equivalent affect velocity Average rear beat out strength All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Torso Construction Design, SAE International.

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