Stress Analysis for the Body Plate

5.2.3 Stress Analysis for the Body Plate

The body plate was analyzed by treating it as a cantilever beam. Figure 22 shows a sketch of the body plate. The 150lbs force was applied at the tip of the beam. Due to the moment effect, bending stress was created on the beam. The maximum stress is located at the sharp corner due to stress concentration.

Figure 22 – Cantilever beam model of body plate

Hand Calculation:

where  (11)

By knowing the location of the stress concentration, the sharp corner was filleted with radius 1.5 in. Using the stress concentration chart from the mechanics of Material book, the stress concentration factor was obtained.

Stress Concentration Factor

Finite Element Analysis

Figure 23 – Boundary conditions and meshing of the body plate

Figure 24 – Bending stress of body plate                   Figure 25 – stress concentration

Figure 26 – Bending stress convergence of body plate

Result Comparison: