BODY STRUCTURAL ELEMENT

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Presentation transcript:

BODY STRUCTURAL ELEMENT SMC 4133 AUTOMOTIVE STRUCTURES BODY STRUCTURAL ELEMENT Consists of frames and panels Made of thin-walled structural elements Non-symmetrical section Forms of several pieces using spot weld All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES CLASSICAL BEAM BEHAVIOUR Structural Requirements All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES BEAM STIFFNESS Structural Requirements INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES EXAMPLE 1 Structural Requirements Does the given section size meets both requirements? Answer: Stress = 208N/mm^2, Deflection = 5.6 mm INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES AUTOMOTIVE BEAM SECTIONS Beam sections in a body structure are commonly non-symmetrical Deflection of the beam generally will not be collinear with the applied load Use principle axis to find deflection that collinear with the load Structural Requirements Deflection Resolve the load Solve for the resulting deflection Calculate the resultant deflection Stress - Resolve the moment Solve for the resulting stress - Find the resultant stress All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES EXAMPLE 2 Structural Requirements Determine the tip deflection and the stress at point A. y x INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES Point loading of thin-walled sections Structural Requirements All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES EXAMPLE 3 Structural Requirements Determine latch structure stiffness. Answer: K system = 33.2 N/mm INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES TORSION OF THIN-WALLED MEMBERS Structural Requirements Closed section INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES Structural Requirements Non-uniform thickness Uniform thickness INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES EXAMPLE 4 Structural Requirements Determine the angle of rotation and the shear stress under the pure torque of T =250 kNmm. Take shear modulus G = 78 Gpa. Answer: Angle = 0.312 degree, Shear stress = 25 N/mm^2 INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES Open section Structural Requirements EXAMPLE 5 Recalculate EXAMPLE 4 but now using open section as shown below and comment on the result. Answer: Angle = 803 degree, Shear stress = 2197 N/mm^2 All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES BUCKLING OF THIN-WALLED MEMBERS Structural Requirements Most of the failure modes are caused by plate buckling of section elements Buckling stress of the rocker: INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES Critical compressive plate buckling stress (simply supported): Structural Requirements a/b > 1 a/b < 1 Plate flexural rigidity INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES Buckling Stress Structural Requirements k = buckling constant All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.

Structural Requirements SMC 4133 AUTOMOTIVE STRUCTURES Techniques to prevent buckling Structural Requirements Reducing width by adding a bead Reducing width by chamfering corners Reducing width by adding corners INSPIRING CREATIVE AND INNOVATIVE MINDS All materials in this slide are taken from Donald E Malen. 2011. Fundamentals of Automobile Body Structure Design, SAE International.