Using BB-Gun or Acoustic Excitation to Find High Frequency Modes in Additively Manufactured Parts

Abstract

Additive manufacturing (AM) considers parts that are produced at a low volume or with complex geometries. Identifying internal defects on these parts is difficult as current testing techniques are not optimized for AM processes. The resonant frequency method can be used to find defects in AM parts as an alternative to X-ray or CT scanning. Higher frequency modes at approximately 8000 Hz and above cannot be tested with a traditional modal hammer or shaker since they do not provide enough excitation. The goal of this paper is to evaluate creative testing techniques to find internal defects in parts with high frequency modes. The two types of testing methods considered are acoustic excitation provided by two speakers and high velocity impact testing produced by a BB - gun. Although the frequency ranges of interest are part dependent, these techniques were able to reach up to 16,000 Hz, which is an additional 8000 Hz above what the traditional modal hammer is able to reach. This work was funded by the Department of Energy’s Kansas City National Security Campus which is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.

Meeting Name

Society for Experimental Mechanics Series

Department(s)

Mechanical and Aerospace Engineering

Comments

This work was funded by the Department of Energy’s Kansas City National Security Campus which is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.

Keywords and Phrases

Additive manufacturing; Excitation; High frequency; Internal defect; NDT

International Standard Book Number (ISBN)

978-303047712-7

International Standard Serial Number (ISSN)

2191-5644; 2191-5652

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2020 The Society for Experimental Mechanics, Inc., All rights reserved.

Publication Date

30 Sep 2020

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