Experimental Setup & Results
Setup
Results
Hang Test
The results are depicted in Figure B – in order to be successful, the static hanging test should support at least 8 lbs. from the socket (the average weight of a prosthetic limb), which was successfully achieved.
Pressure Test
Pressure readings at 6 different points around the limb were taken (the socket is in a static standing position). These readings are compiled in Figure A. The goal of this test was to show that a constant pressure was maintained in our socket when it was completely fastened, as compared to the control. The control socket had two trials, one with a fitted a mold, and the other with a mold 10% smaller. As depicted in the boxplot, the pressure change was significant.
For our socket, five different molds were utilized. One was a fitted mold, the other four were ±5 and 10%. A constant pressure throughout the trials was successful achieved.
Torque test
Torque tests were performed – while walking, the socket must be able to support applied moments along the transverse plane. Literature reports a value of 6 Nm, or approximately 70 inch-pounds for proper ambulation. We set ourselves a higher goal of 20 Nm to account for turning motions (little literature available here). For the lower qualification, our socket achieved a 100% success rate, showing that the socket (granulated beads) could successfully withstand applied shear).
Figure A.
Figure B.