• Title/Summary/Keyword: Stress Intenstiy Factor

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Determination ofStress Intenstiy Factor by Strain Measurement (스트레인 측정에 의한 응력확대계수의 결정)

  • 이억섭;홍성경;윤경수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.10a
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    • pp.369-374
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    • 1993
  • Measurements of strain near a crack tip with electrical resistance strain gages do not usually provide a reliable value of stress intensity factor (K sub I) because of local yielding and limited regions for strain-gage placement. This paper attempted to define a valid region and to indicate procedures for locating and orienting the strain-gage to determine stress intensity factor accurately from one stain-gage readings.

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Assessment of Static Crack Resistance Behavior on Particulate Reinforced Composite for Solid Propellant (고체 추진용 입자강화 복합재의 정적 균열 저항 거동 평가)

  • Seo, Bohwi;Choi, Hoonseok;Kim, Jaehoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.5
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    • pp.29-34
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    • 2014
  • Particulate reinforced composite is composed of hard particles and polymer matrix. This material has been widely applied for engineering industry such as automobile, construction and aerospace. For the safe application, it is important to assess crack resistance behavior. Especially in aerospace industry, crack could cause significant problem when the material is used for solid rocket fuel. Therefore, it is inevitable to estimate the characteristics of the crack propagation. In this study, crack propagation tests were conducted using particulate reinforced composite under crosshead rate 2.54 mm/min in the range of temperature $-60^{\circ}C$ to $60^{\circ}C$. The strain contour of surface for specimen was generated using digital image correlation method.