Simulation of Dynamic Crushing Behavior of Simulated Carbon/Epoxy Stanchions Using MAT58 and MAT213 in LS-DYNA

Rudy T. Haluza, J. Michael Pereira, Trenton M. Ricks, Robert K. Goldberg, Charles E. Bakis, Kevin L. Koudela

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Carbon fiber-reinforced polymer (CFRP) composites have shown promise as a material for structures designed to absorb energy in crush-style impact loading. However, simulating the behavior of CFRP structures in dynamic, crushing-style impact loading is challenging because of the many damage and failure modes that are essential to capture in the model. For the present investigation, CFRP stanchions were tested using a crash sled experimental test rig. The stanchions were designed by the Composite Materials Handbook-17 (CMH-17) Crashworthiness Working Group for the purpose of comparing experimental crash sled tests to corresponding simulations of the tests. The stanchions are C-channel shaped and represent a geometry common in the interior of aerospace vehicle structures. Explicit simulations in LS-DYNA were performed using a well-established composite material model (MAT58) and a next-generation material model (MAT213). Simulating the crushing of the stanchions occurred in two phases. First, the material models were calibrated using flat specimens that were manufactured with the same layup as the stanchions. While the original goal was calibration of material-related properties, mesh-dependent behavior was observed in simulations with both material models, and an unstructured mesh was therefore selected to remediate undesirable mesh-dependent failure modes. Additionally, for both the MAT58 and MAT213 models, it was found that either the crush force or the failure mode could be modeled accurately, but no set of parameters could be identified to optimize both results in the same model. Once satisfactory calibration was achieved, the same material parameters were applied to the stanchion crush simulations. The stanchion simulations showed that MAT213 more accurately predicted the experimentally determined crush force, and both material models predicted key aspects of the experimentally observed failure modes.

Original languageEnglish (US)
Title of host publicationProceedings of the American Society for Composites - 38th Technical Conference, ASC 2023
EditorsMarianna Maiaru, Gregory Odegard, Brett Bednarcyk, Evan Pineda
PublisherDEStech Publications
Pages1832-1846
Number of pages15
ISBN (Electronic)9781605956916
StatePublished - 2023
Event38th Technical Conference of the American Society for Composites, ASC 2023 - Boston, United States
Duration: Sep 18 2023Sep 20 2023

Publication series

NameProceedings of the American Society for Composites - 38th Technical Conference, ASC 2023

Conference

Conference38th Technical Conference of the American Society for Composites, ASC 2023
Country/TerritoryUnited States
CityBoston
Period9/18/239/20/23

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films

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