The lower arms of a front-end loader are shown in Figure P11-25. The loader material is AISI 1010 cold drawn steel with a modulus of elasticity of 29.7 × 106 psi and Poisson's ratio of 0.29. The yield strength of the material is 44,200 psi. In the finite element model, the back faces of the top horizontal members are fixed. Determine the maximum force that can be applied to the bottom of the left arm to cause yielding of the arm. You may want to try loads that are vertical (y-directed) and lateral (z-directed). (This problem is by Quentin Moller.)

The depth of the 32-in. cross member is 5 in. into the paper

Figure P11-25 Lower arms of front end loader (dimensions in inches) and a typical finite element model (By Quentin Moller)

Transcribed Image Text:

17.500 0.250 ø1.000 3.000 18.500 4.582 32.000 34.333 ø1.000 31.261 /2.500 2.500 000'II 44.443 49.314 8.050 14.995