Browsing by Subject "frequency response function"
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Item Effects of Identical Parts on a Common Build Plate on the Modal Analysis of SLM Created Metal(University of Texas at Austin, 2018) Cullom, Tristan; Hartwig, Troy; Brown, Ben; Johnson, Kevin; Blough, Jason; Barnard, Andrew; Landers, Robert; Bristow, Douglas; Kinzel, EdwardThe frequency response of parts created with Additive Manufacturing (AM) is a function of not only process parameters, powder quality, but also the geometry of the part. Modal analysis has the potential to evaluate parts by measuring the frequency response which are a function of the material response as well as the geometry. A Frequency Response Function (FRF) serves as a fingerprint of the part which can be validated against the FRF of a destructively tested part. A practical scenario encountered in Selective Laser Melting (SLM) involves multiple parts on a common build plate. Coupling between parts influences the FRF of the parts including shifting the resonant frequencies of individual parts in ways that would correspond to changes in the material response or geometry. This paper investigates the influence of the build plate properties on the coupling phenomena.Item Modal Response as a Validation Technique for Metal Parts Fabricated with Selective Laser Melting(University of Texas at Austin, 2016) Pribe, Joshua D.; West, Brian M.; Gegel, Michelle L.; Hartwig, Troy; Lunn, Toby; Brown, Ben; Bristow, Douglas A.; Landers, Robert G.; Kinzel, Edward C.This paper investigates modal analysis as a validation technique for additively manufactured parts. The Frequency Response Function (FRF) is dependent on both the geometry and the material properties of the part as well as the presence of any defects. This allows the FRF to serve as a “fingerprint” for a given part of given quality. Once established, the FRF can be used to qualify subsequently printed parts. This approach is particularly attractive for metal parts, due to the lower damping as well as use in high-value applications where failure is unacceptable. To evaluate the efficacy of the technique, tensile specimens are printed with a Renishaw AM250, the modal response of these parts is characterized prior to tensile testing, and the FRFs are compared to their engineering metrics for parts printed with both nominal and off-nominal parameters. Numerical modeling is used to understand the modal structure, and the possibility of defect prognosis is also explored by comparing the measured response to simulation results.