Question

In the rear wheel suspension of the Volkswagen Beetle, the spring motion is provided by a torsion bar fastened to an arm on which the wheel is mounted. See Figure below. According to the Figure, the torque in the torsion bar is created by the force Fz acting on the wheel from the ground through a lever arm.

1) Determine the safety factors for the torsion bar based on both the distortion energy theory (DET) and the maximum shear stress theory (MSST) and compare them. Assume the material to be steel SAE 4130 quenched and tempered at 1,200F

2) Determine the safety factors for the torsion bar based on the modified-Mohr theory and plot the state-of-stresses together with the failure envelope. Assume the material to be Gray Cast-iron Class 60.

In the rear wheel suspension of the Volkswagen Beetle, the spring motion is provided by a torsion bar fastened to an arm on which the wheel is mounted. See Figure below. According to the Figure, the torque in the torsion bar is created by the force F. acting on the wheel from the ground through a lever arm 1) Determine the safety factors for the torsion bar based on both the distortion energy theory (DET) and the maximumtorsion bar shear stress theory (MSST) and compare them. Assume the material to be steel SAE 4130 quenched and tempered at 1,200 °F: Force: F23V Diameter o 26mm Bearing Main support Arm c 0.35m lorsion bar 2) Determine the safety factors D- 0.075m for the torsion bar based on the modified-Mohr theory and plot the state-of-stresses together with the failure envelope. Assume the material to be Gray Cast-iron Class 60 Typical suspension (used in the VW Beetle) Torsion am Main Torsion bar

Answer 1