Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Crack Resistance Behavior Using Digital Image Correlation and Crack Tip Opening Angle on Particulate Reinforced Composite

디지털 화상관련법 및 균열선단열림각도를 이용한 입자강화 복합재료의 균열저항거동

  • Received : 2016.05.13
  • Accepted : 2016.10.10
  • Published : 2016.12.01
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Abstract

In this study, crack resistance is evaluated by the crack tip opening angle (CTOA) using a wedge splitting test (WST) on a viscoelastic particulate reinforced composite based on an HTPB binder. Generally, CTOA, as a function of crack extension, is used in order to determinate fracture resistance and has a steady state relative angle. Digital image correlation (DIC) is used to measure the crack tip opening displacement (CTOD) and crack extension for the critical crack tip opening angle (CTOAc). In these results, the CTOAc value of a particulate reinforced composite tends to approach a constant angle after a small amount of crack extension. The CTOAc value increases with decreasing temperature, from $50^{\circ}C$ to $-40^{\circ}C$. These CTOAc values may be used to measure fracture mechanics parameters for particulate reinforced composite.

본 연구는 점탄성을 가진 HTPB 입자강화 복합재료의 균열저항에 대하여 쐐기분열시험 및 균열선단열림각도를 이용하여 평가하였다. 일반적으로 균열진전 함수로서 균열선단열림각도는 파괴저항을 결정하기 위해 사용되며, 수치적으로 일정한 값을 가진다. 디지털 화상관련법은 임계 균열선단열림각도를 도출하기 위하여 균열선단열림변위 및 균열진전길이를 측정하기 위해 사용되었다. 본 연구의 시험 결과에서 입자강화 복합재료의 임계 균열선단열림각도는 균열초기 진전 후 일정한 값을 가진다. 임계 균열선단열림각도는 $50^{\circ}C$에서 $-40^{\circ}C$로 온도의 감소에 따라 증가한다. 이러한 임계 균열선단열림각도는 입자강화 복합재료의 파괴역학 파라미터로 사용될 수 있다.

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References

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