Compression after impact of sandwich composite structures: Experiments and modeling

Michael W. Czabaj, Alan T. Zehnder, Barry D. Davidson, Abhendra K. Singh, David P. Eisenberg

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

13 Scopus citations

Abstract

A combined experimental and computational study is undertaken to measure the damage tolerance of sandwich composite structures, to understand their damage modes and failure mechanisms, and to develop predictive models for residual compressive strength. The study is performed on specimens of aluminum honeycomb core with eight ply quasi-isotropic, graphite/epoxy face sheets. Damage at the visible detection threshold is induced through quasi-static indentation of 25.4 and 76.2 mm diameter spheres. Compression tests of undamaged and damaged samples are performed for a range of layups and core densities. Results show that residual strength is sensitive to combination of face sheet and core properties, to the indentation damage type and extent, and to the observed failure mode. A finite element model is developed using Abaqus®/Explicit to simulate quasi-static indentation and compression after impact tests. The aluminum honeycomb core geometry is modeled explicitly using elastic-plastic shell elements, and validated against core crushing experiments. The predicted residual dent profiles show that the model successfully captures the mechanics of core crushing during indentation. However, the residual strength is over-predicted based on simulation of compression after impact. Future work will incorporate evolution of face sheet damage due to indentation and compressive loading.

Original languageEnglish (US)
Title of host publication51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
StatePublished - Dec 16 2010
Event51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Orlando, FL, United States
Duration: Apr 12 2010Apr 15 2010

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
ISSN (Print)0273-4508

Other

Other51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityOrlando, FL
Period4/12/104/15/10

ASJC Scopus subject areas

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Czabaj, M. W., Zehnder, A. T., Davidson, B. D., Singh, A. K., & Eisenberg, D. P. (2010). Compression after impact of sandwich composite structures: Experiments and modeling. In 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference [2010-2867] (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference).