Varying results were found, with the moment arm being in a range of 8 to 14 inches, with 14 inches essentially being the maximum moment arm a 5’1” individual can comfortable make and still operate the crutches in the appropriate manner. Being 5’1” myself, I measured the moment arm I created while using the crutches. Every time the crutch is used it has a pressure acting on the end that sits under the arm of the user. Dimension values for lengths depicted in Figure 1.Īn appropriate moment arm needed to be measured and defined. Visual representation of crutch dimensions. The overall thickness of the crutch was 0.75 inches. The corresponding value to the lengths depicted in Figure 2 are displayed in Table 1. A visual representation of these dimensions can be seen in Figure 1. This weight was based on the fact that the crutches used for dimensions were for a 5’1” patient and that the average weight of a someone who is 5’1” is approximately 120 pounds.ĭimensions were obtained from a pair of crutches used by my brother. The crutch dimensions and loading conditions implemented into the Inspire model, mimic that of a crutch being used by a 5’ 1”, 120-pound individual. The project was performed using the software, Inspire. It was my interest to see if the result of the topology optimization was similar to the current crutch design and in what way these designs differed. I chose to perform a topology optimization on a crutch design to determine the optimum material placement that minimizes volume and maximizes stiffness.
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