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Coursework
Solve the following two exercises and provide a report with the requested solutions and the SolidWorks files (extension .SLDPRT) of the exercises.
Exercise 1.
Design a cantilever beam (length × width × height: 50 cm × 5 cm × 2.5 cm ) made of steel where a distributed normal load of 100 N is applied at the end of the beam. Define the appropriate boundary conditions and report the following:
1) Screenshot of the boundary condition.
2) Screenshot of the final finite element mesh used in your simulation and justify your selection.
3) Simulate the stress and displacements. Plot vertical and horizontal components of the stress and displacement and provide screenshots of your results. Explain what they mean.
4) Change the distributed normal load for a distributed shear load at the end of the beam, simulate and provide a screenshot comparing side-by-side the stresses obtained from the two studies. Produce a similar figure comparing the displacements.
5) Explain the meaning of your results (points 3 & 4) and what you conclude from the comparison.
Exercise 2. Simulation of a lateral fall
Aim: To simulate the stresses and displacements generated on the femur bone due to a lateral fall and determine the most likely place for a fracture to occur.
The force location is medio-lateral and distributed on the surface elements on the femoral head as shown in Fig.
Simulate a fall for a person with a height of 175 cm and a weight of 75 Kg. The boundary conditions are as indicated in Fig. 1: (1) the bottom part of the femur is fixed in all directions and (2) the site of the impact (flat edge in the trochanter bone – indicated in yellow) is fixed on the direction of the force. For the simulation use the STL file Femur_bone_3p5x3p5x3p5_cropped.stl and the material properties of cortical bone (see FEM Lecture 3).
Report the following:
1) Screenshots of the STL file uploaded in SolidWorks.
2) Screenshot of the material property window showing the cortical bone material properties.
3) Screenshot of the boundary conditions. Justify why these boundary conditions are suitable or what they represent in the specific case study.
4) The calculation of the force applied, and a screenshot of the load applied.
15) Simulate the stress and displacement and provide illustrative figures of the simulation.
6) Discuss your results and their meaning, their suitability and accuracy. What aspects of the simulation you would improve for more realistic results?
7) According to the simulation results, where are the most likely places for a fracture to occur?
Fig. 1 Boundary conditions for the simulation of the lateral fall