A radio-control car front steering unit is shown in Figure P11-22. The arm is made of molded ABS plastic with a modulus of elasticity of 362,000 psi and a tensile strength of 6000 psi. The base of the steering unit is attached to the frame of the car by bolts, so the three holes that the bolts pass through are assumed fixed around their cylindrical surface (as shown in the finite element model). A force of 3 lbs is applied circumferentially around the upper finger (as shown in the finite element model). This force represents the typical weight of a remote-control car. Determine the maximum von Mises stress and largest displacement of the control arm. (This problem is by Phillip Grommes.)

Figure P11-22 Radio-control front steering unit (all dimensions in inches) and finite element model (By Phillip Grommes)

0.65 0.38 0.61 RO.01 0.54 0.75 0.64 RO.10 0.40 0.23 0.59 0.43 0.33 0.20 00.13 0.12 0.07 0.07 1.79 0.10 0.46 1.32 0.20