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A two-dimensional approximation of a bicycle frame is shown in the figure.
Supports:
Pinned (UX and UY) at the rear axle
Vertical (UY only) at the front axle
Use proper UZ constraint in a 3D model to prevent rigid body motions without creating artificial stress.
This structure is to be analyzed for two load conditions:
25 lbf on the handle bars and 150 lbf on the seat (location A)
25 lbf on the handle bars and 150 lbf on the pedal bearing (location B)
For both loadings, use a design factor of 3 (i.e., multiply the loads by 3 to account for dynamic effects)
The structure is assembled from two sizes of tubing. A heavier tubing is used from location A to B, and from the handle bars to the front axle. All other sections are the lighter tubing. Tubing material: Aluminum 6061-T6. All joints between tubes are welded together.
| Cross-Sect. Area (in2) | Moment of Inertia (in4) | Section Height (in) | Inner Radius (in) | Outer Radius (in) | |
| Lighter Tube Section | 0.167 | 0.0073 | 0.675 | 0.2465 | 0.3375 |
| Heavier Tube Section | 0.333 | 0.037 | 1.05 | 0.4119 | 0.525 |
Analyze this structure in a static analysis simulation.
an element plot, showing different tubing sizes and including the beam height (ANSYS: use /ESHAPE; WBE Mesh plot)
an Environment plot showing the loads and constraints for BOTH load cases.
deformed shape plots for BOTH load cases
(ANSYS) shear and bending moment plots (PLLS) from Element Table forces (MFORY) and moments (MMOMZ) for both load cases
(ANSYS) max. and min. beam stress (PLLS) from Element Table stress data (SMAX_I, SMAX_J, SMIN_I, SMIN_J) for both load cases
(WBE) beam stress plots: Direct, Min. Combined, Max. Combined stress for BOTH load cases
(ANSYS) evaluate the beam stress with /ESHAPE and PowerGraphics=ON. Plot vonMises and x-direction stress for each load case
(ANSYS) The modeling session log file (with comments added)