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Fracture, Fatigue, Failure and Damage Evolution, Volume 7 pp 7–12Cite as

Effect of Strain Rate and Interface Chemistry on Failure in Energetic Materials

Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

We study the failure at interfaces between Hydroxyl-terminated polybutadiene (HTPB)-Ammonium Perchlorate (AP) based energetic material. In this work, interface mechanical strength of a set of HTPB-AP interfaces is characterized using nano-scale impact experiments at strain rates up to 100 s−1. A power law viscoplastic constitutive model was fitted to experimental stress-strain-strain rate data in order to obtain constitutive behavior of interfaces, particle, and matrix. A mechanical Raman spectroscopy is used to analyze the effect of binding agent at different temperature. A tensile fracture experiment combined with In-situ Mechanical Raman Spectroscopy was used to obtain fracture properties. Stress maps are obtained near the interface using In-situ Mechanical Raman Spectroscopy to analyze the changes in the stress distribution around interfaces for different loads till failure. Cohesive zone model parameters were obtained from the consideration of local stress during failure and the cohesive energy required for delamination of AP from HTPB matrix. Effect of binding agent on the interface strength is found to be quite significant. The cohesive zone parameters and the viscoplastic model obtained from the experiment were then used in the cohesive finite element method to simulate the dynamic crack propagation as well as the delamination. Results show that interfacial properties are affected by the rate of loading and are also dependent upon the binding agent.

Keywords

  • Energetic material
  • Stress/strain relationship
  • HTPB
  • AP
  • NRS

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Acknowledgments

This research was supported by US-AFoSR Grant FA9550-15-1-0202 (Program Manager Dr. Martin Schmidt).

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Authors and Affiliations

  1. School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN, 47907, USA

    Chandra Prakash & Vikas Tomar

  2. School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA

    I. Emre Gunduz

Authors
  1. Chandra Prakash
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  2. I. Emre Gunduz
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  3. Vikas Tomar
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Corresponding author

Correspondence to Vikas Tomar .

Editor information

Editors and Affiliations

  1. Sandia National Laboratories, Albuquerque, New Mexico, USA

    Jay Carroll

  2. School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA

    Dr. Shuman Xia

  3. Pennsylvania State University, State College, Pennsylvania, USA

    Alison M. Beese

  4. Department of Mechanical & Aerospace Engineering, Utah State University, Logan, Utah, USA

    Dr. Ryan B. Berke

  5. Department of Mechanical Engineering, Clemson University, Clemson, South Carolina, USA

    Prof. Garrett J Pataky

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Prakash, C., Emre Gunduz, I., Tomar, V. (2018). Effect of Strain Rate and Interface Chemistry on Failure in Energetic Materials. In: Carroll, J., Xia, S., Beese, A., Berke, R., Pataky, G. (eds) Fracture, Fatigue, Failure and Damage Evolution, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-62831-8_2

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  • DOI: https://doi.org/10.1007/978-3-319-62831-8_2

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