Crack Initiation Study on Aircraft Composite Rib with Semi-elliptical Surface Flaw

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• 作者：V. Sivakumar ; G. Bharath Kumar…
• 关键词：Crack initiation ; Delamination ; Stress intensity factor ; Composite ; Finite element method
• 刊名：Journal of Failure Analysis and Prevention
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：15
• 期：6
• 页码：906-914
• 全文大小：1,589 KB
• 参考文献：1.T.L. Anderson, Fracture Mechanics Fundamentals and Applications (CRC Press, Boca Ralton, 1991)
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• 作者单位：V. Sivakumar (1)
  G. Bharath Kumar (1)
  Ambati Gautham (1)
  
  1. Department of Aerospace Engineering, Amrita Vishwa Vidyapeetham, Amritanagar P.O, Coimbatore, 641 112, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Tribology, Corrosion and Coatings
  Characterization and Evaluation Materials
  Mechanics
  Structural Mechanics
  Quality Control, Reliability, Safety and Risk
  
• 出版者：Springer Boston
• ISSN：1864-1245

文摘

A parametric study on crack initiation was done by having different sizes of cracks at different locations in a rib section of an aircraft using finite element techniques. A semi-elliptical surface flaw in a typical Boeing-747 rib section having circular cut-out and experiencing an in-plane shear loading was considered for the analysis. A laminated composite square plate around a centrally located cut-out was selected in the wing rib for computation purpose. A delamination has been modeled in between the composite layers in the form of a semi-elliptical surface crack using node duplication technique. As there are no theoretical solutions for mixed mode loading problems, the general purpose finite element package ABAQUS was used to obtain the Stress Intensity Factor (SIF) along the crack edge. These stress intensity factor (K <sub>Csub>) values were further compared with the fracture toughness of the material to determine the probability of crack initiation. It was observed that the modes of failure change with the dimensions of the crack and also showed a greater tendency towards the crack initiation. Keywords Crack initiation Delamination Stress intensity factor Composite Finite element method