Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Evaluation of Crack Resistance Properties on Particulate Reinforced Composite Propellant using Digital Image Correlation

DIC에 의한 입자강화 복합재 추진제의 균열저항 특성평가

  • Na, Seonghyeon (School of Mechanical Design Engineering, Chungnam National University) ;
  • Choi, Hoonseok (School of Mechanical Design Engineering, Chungnam National University) ;
  • Oh, Kwangkeun (School of Mechanical Design Engineering, Chungnam National University) ;
  • Kim, Jaehoon (School of Mechanical Design Engineering, Chungnam National University)
  • Received : 2015.06.02
  • Accepted : 2015.10.20
  • Published : 2015.12.01
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Abstract

In this study, it is evaluated for fracture toughness to analyze crack resistance properties of particulate reinforced composite propellant. Fracture toughness test using WST specimen is conducted by temperature conditions from $50^{\circ}C$ to $-60^{\circ}C$. Evaluation method for fracture toughness calculated using an equation suggested by ASTM E399 with linear elastic fracture mechanics. From these result, splitting loads and stress intensity factors of propellant increase according to decrease of test temperature. Also, the strain fields of specimen surface using digital image correlation increase as temperature decreased from $50^{\circ}C$ to $-40^{\circ}C$, but it sharply decreases at $-60^{\circ}C$ because of brittle behavior.

본 연구에서는 파괴인성에 대하여 입자강화 복합재 추진제의 균열저항 특성을 분석하기 위하여 평가되었다. $50^{\circ}C$에서 $-60^{\circ}C$까지 온도 범위에서 WST 시험편을 이용하여 파괴인성시험이 수행되었다. 파괴인성에 대한 평가방법은 선형탄성파괴역학에 기초한 ASTM E399를 이용하여 산출하였다. 추진제의 분열하중과 응력확대계수는 온도가 내려감에 따라 증가하고 있다. 또한 디지털 이미지 상관법을 이용하여 가시화된 변형률장은 온도가 $50^{\circ}C$에서 $-40^{\circ}C$로 내려갈수록 증가하나, $-60^{\circ}C$에서 변형률장은 취성거동으로 인해 크게 감소한다.

Keywords

References

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