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STRESS DISTRIBUTION IN AN ANTI ROLL BAR

STRESS DISTRIBUTION IN AN ANTI ROLL BAR. GROUP 40: VIRAJ VAJRATKAR (05D10021) PAWEL SOGRA (05D10016). ME 613 Course Presentation. Graphic Modeling (Pre - ANSYS). Modeled in SolidWorks 2008 Rough dimensions: (mm)  Overall Length: 1040  Moment Arm: 210  Outer Diameter: 31.25

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STRESS DISTRIBUTION IN AN ANTI ROLL BAR

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  1. STRESS DISTRIBUTION IN AN ANTI ROLL BAR GROUP 40:VIRAJ VAJRATKAR (05D10021) PAWEL SOGRA (05D10016) ME 613 Course Presentation

  2. Graphic Modeling (Pre - ANSYS) • Modeled in SolidWorks 2008 • Rough dimensions: (mm) Overall Length: 1040 Moment Arm: 210 Outer Diameter: 31.25 Wall thickness: 4 Bearing Length: 50

  3. Static Analysis • Assumptions: Car going in a 0.9g turn. Track width = 1650 mm and CG height = 550 mm. • Element:SOLID186. Accurate (large no. of nodes - 20) and affordable as it is a static study. No need for using layered elements as a composite not used. • Material:Linear isotropic AISI steel (E = 200000 N/mm2, ν = 0.29). • Mesh: SOLID186 using Smart Size Level 7. • Loading: From above assumption 30% of weight = 0.3 x 1435/2 x 9.81 = 2111.61 N.

  4. Static Analysis (Contd…) • Results:(shear stress) Material Removal Fillet

  5. Static Analysis (Contd…) • Verification from theory: T = Rolling torque applied = 2(Load Applied)(Moment Arm) = 2 x 2111.61 x 210/1000 = 886.88 Nm, J = Polar moment of inertia = π(r04-ri4)/2 = π*((31.25/2000)4-(23.25/2000)4)/2 = 6.4 x 10-8 m4. Now,  τmax = TR/J = 886.88*31.25/(2000*6.4 x 10-8) = 216.54 N/mm2.

  6. Dynamic Analysis • Assumptions: Vehicle speed = 80 km/hr, from a research paper by Stone & Cebon. Approximated F = ±20000sin(21t). • Loading as said above and constraints as in the static case.

  7. Dynamic Analysis (Contd…) • Element: Large no. of equations involved in transient analysis implies use of a simple element having fewer nodes. Most simple is the SOLID45 element (8 nodes). • Material and mesh: As in static case. • Performed simulation by applying the force for 1.5 s with 30 load steps.

  8. Dynamic Analysis (Contd…) • Results: (All shear stresses at a fixed time [end]) Critical point

  9. Dynamic Analysis (Contd…) • Results:(shear stress as function of time @ critical point)

  10. THANK YOU

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