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NASA NTRS · Accepted Manuscript (Version with final changes)

Novel Crash Sled with a Translating Support Mass

Published 2022-01-18 From Glenn Research Center 6 authors
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Attribution

This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Glenn Research Center.

Abstract

Verbatim from NASA NTRS. Not paraphrased, not summarized.

Background: A novel crash sled has been developed with a translating support, incorporating transducers that allow multiple methods of measuring energy absorption to fully characterize the dynamic crush response of composite components. Objective: The main goal of the current investigation was to demonstrate functionality, repeatability, and accuracy of crush testing using a crash sled with a translating support mass. Methods: A semi-automated algorithm for data reduction was developed based on impact mechanics principles. A preliminary set of tests was initially conducted using aluminum honeycomb specimens with a specified stable crushing force to quantify the accuracy and repeatability of the crush data. Following the success of these tests, triaxially-braided fiber-reinforced polymer (FRP) specimens were evaluated. Results: Crush tests with the aluminum honeycomb specimens showed excellent outcomes for all three specimens. These data provided close agreement with cumulative energy absorption between individual instruments and stable crushing forces at expected values. For the FRP specimens, specific energy absorption (SEA) and force-displacement curves were successfully measured; however, data from the translating support mass accelerometer was excluded from the dataset due to clipping. The SEA of the corrugated specimens was greater than the SEA for the C-channel specimens at both test speeds. Conclusions: The crash sled functionality was verified, the specimen geometry was found to contribute more to SEA than the impact speed in the speed range tested, and the support mass accelerometer will be upgraded to prevent clipping in future tests.

Authors

  • R T Haluza Pennsylvania State University
  • C R Ruggeri Glenn Research Center
  • J M Pereira Glenn Research Center
  • S G Miller Glenn Research Center
  • C E Bakis Pennsylvania State University
  • K L Koudela Pennsylvania State University

Keywords

  • Dynamic Crush
  • Composite Materials
  • Crashworthiness

Citation: R T Haluza, C R Ruggeri, J M Pereira , et al. (2022). Novel Crash Sled with a Translating Support Mass. Glenn Research Center. NASA NTRS ID 20210025725. https://ntrs.nasa.gov/citations/20210025725 ↗