Student: Lucas Petersen
Committee: Dr. Marc Mignolet
Abstract:
The objective of this research was to investigate the suitability of using single-piece 3D-printed specimens to simulate a clamped-clamped beam. Enforcing a clamped-clamped condition using fasteners and other components can be challenging and inaccurate. It was hypothesized that a beam specimen with “blocks” at the ends that create a sudden increase in inertia and stiffness could accurately simulate clamping. 3D-printing allows such specimens to be manufactured far more easily than traditional machining techniques. Five samples were 3D-printed, and laser vibrometers were used to capture free-response data due to a small excitation. The results indicate that this type of 3D-printed specimen is likely suitable for simulating a clamped-clamped beam. However, this specific design experienced a variable and unquantified loading when mounted that limits the utility of the data collected. A redesign is recommended, and a few alternatives are proposed. Finally, the experimental data was used to generate a non-parametric 90% confidence interval in response to various loading conditions. The variability in the torsional natural frequency was used to calibrate the confidence interval, as it was largely unaffected by the induced load. The confidence interval reflects the uncertainty that could be expected due to variability in the material properties and/or residual stresses from the manufacturing process.
Zoom Room: https://asu.zoom.us/j/4047347782
Presentation Time: 12:00-1:00 PM (Arizona Time)
