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This study introduces an advanced optical method to precisely measure the mechanical properties of nitrate ester plasticized polyether (NEPE) propellants. The research accurately determined NEPE

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Optics

Background:

  • Increasing engineering complexity necessitates advanced measurement techniques for intricate mechanical problems.
  • Traditional methods are insufficient for accurately characterizing the 3D shape and deformation of advanced materials.
  • Nitrate ester plasticized polyether (NEPE) propellants, high-energy materials, possess unique properties challenging conventional mechanical analysis.

Purpose of the Study:

  • To propose a simple, highly accurate optical measurement method for NEPE propellants.
  • To investigate the volume change rate, Poisson's ratio, and true stress-strain curves of NEPE.
  • To analyze NEPE's mechanical behavior under various displacement loading rates.

Main Methods:

  • Employed defocusing and digital image correlation (DIC) methods for precise strain measurement.
  • Measured three-dimensional strain of NEPE during unidirectional stretching.
  • Utilized optical techniques to obtain material properties at different tensile strain rates.

Main Results:

  • Successfully obtained volume change rate, Poisson's ratio, and true stress-strain curves for NEPE.
  • Characterized NEPE's mechanical response across a range of stretching rates.
  • Determined the damage initiation engineering strain of NEPE to be 0.4687 at varying tensile strain rates.

Conclusions:

  • The developed optical method provides accurate characterization of NEPE propellant mechanics.
  • This research offers crucial data for understanding NEPE's behavior under tensile stress.
  • The findings contribute to the safe and effective application of high-energy propellants in engineering.