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

The Korean Society of Mechanical Engineers (대한기계학회)
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Analysis of Cracking Characteristics with Indenter Geometry Using Cohesive Zone Model

Cohesive Zone Model을 이용한 압입자 형상에 따른 균열특성분석

  • Hyun, Hong Chul (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Lee, Jin Haeng (Division for Research Reactor, Korea Atomic Energy Research Institute) ;
  • Lee, Hyungyil (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Kim, Dae Hyun (Graduate School of NID Fusion Technology, Seoul Nat'l Univ. of Science and Technology) ;
  • Hahn, Jun Hee (Korea Research Institute of Standards and Science)
  • Received : 2012.12.28
  • Accepted : 2013.10.04
  • Published : 2013.12.01
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Abstract

In this study, we investigated the effect of the indenter geometry on the crack characteristics by indentation cracking test and FEA. We conducted various cohesive finite element simulations based on the findings of Lee et al. (2012), who examined the effect of cohesive model parameters on crack size and formulated conditions for crack initiation and propagation. First, we verified the FE model through comparisons with experimental results that were obtained from Berkovich and Vickers indentations. We observed whether nonsymmetrical cracks formed beneath the surface during Berkovich indentation via FEA. Finally, we examined the relation between the crack size and the number of cracks. Based on this relation and the effect of the indenter angle on the crack size, we can predict from the crack size obtained with an indenter of one shape (such as Berkovich or Vickers) the crack size for an indenter of different shape.

본 연구에서는 유한요소해석과 압입시험으로 압입자 형상이 압입균열특성에 미치는 영향을 조사했다. 본 논문에서는 Lee 등(2012)이 제시한 cohesive zone 모델특성 및 균열생성, 진전을 위한 해석조건에 기초해 다양한 균열해석을 수행했다. 우선, 사각뿔 및 삼각뿔 압입균열 시험과 해석을 비교해 해석모델의 유효성을 검증했다. 아울러 비대칭 압입자에 의한 압입시, 압입하부에서 비대칭 균열의 발생여부를 해석적으로 관찰했다. 최종적으로 압입발생 균열수와 균열길이 관계를 조사했다. 균열수와 균열길이 관계 및 동일 압입자형상(압입자 모서리수)에서 압입자각에 따른 균열길이 변화를 이용하면, 특정 압입자 형태의 압입시험에서 얻은 균열길이 만으로 다양한 압입자 형태의 균열길이를 예측할 수 있다.

Keywords

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