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1999 Fiscal Year Final Research Report Summary

Mechanism of Impact Damage and CAI Strength Reduction of Fiber Reinforced Composite Laminate

Research Project

Project/Area Number 09650116
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionSophia University

Principal Investigator

SUEMASU Hiroshi  Faculty of Science and Technology, Sophia University, Professor, 理工学部, 教授 (20134661)

Co-Investigator(Kenkyū-buntansha) GOZU Katsuhisa  Faculty of Science and Technology, Sophia University, Research Associate, 理工学部, 助手 (40178439)
MAJIMA Osamu  Faculty of Science and Technology, Sophia University, Research Associate, 理工学部, 助手 (90053678)
Project Period (FY) 1997 – 1999
KeywordsComposite laminate / Interlaminar delamination / Impact / Finite element analysis / Compressive buckling / Energy release rate
Research Abstract

A research work is conducted to understand CAI (Compression After Impact) problem and to give a theoretical base for estimating the significance of the foreign object impact on the compressive performance of composite laminated structures. The problem consists of two parts:
・ Impact damage initiation and development
・ Compressive behavior of the damaged plate
Both portions are too complex to simply explain the theoretical idealized solution. So the numerical analysis and model experiments are conducted for both parts to identify the effects of the various parameters such as impact energy, stacking sequence etc on the compressive performance. In order to simulate the damage accumulation process in the interface region, a fracture element is proposed and the simulated results well coincides with the existing theory and many new findings are shown using the damage element, such as unstable delamination propagation at the early stage of the damage accumulation, propagation of all embedded delaminations instead of a few delaminations etc. The theory can be incorporated in the analysis of the compressive behavior of the damaged plate. In the compression problem, three dimensional finite element analysis is conducted to investigate the buckling performance and the postbuckling behavior including the calculation of the fracture mechanical parameter (energy release rates GィイD2IィエD2, GィイD2IIィエD2, GィイD2IIIィエD2) along the embedded delaminations. The complex compressive behavior of the delaminated laminate with many delaminations is well simulated, where the contact problem must be considered. The solution well explains the very complex experimental results including damage propagation before the final fracture. Particularly, the first delamination propagation occurred at the delamination expected from the present analysis.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] H. Suemasu: "On an experimental method to measure mode III interlaminar fracture toughness of composite laminates"Composite Science and Technology. Vol.59. 1015-1021 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Suemasu, Osamu Majima, Y. Aoki: "Instability of multiple penny-shape delamination in composite laminates subjected to quasi-static transverse loading"journal of Reinforced Plastics and Composites. Vol.18, No.12. 1156-1169 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 間島理、末益博志: "複合材料積層板中の層間剥離伝播挙動の有限要素解析"日本複合材料学会誌. Vol.25, No.4. 140-148 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Suemasu, T. Kumagai and K. Gozu: "Compressive behavior of rectangular composite laminates with multiple circular delaminations I. Experiment and analytical development"AIAA Journal. Vol.36, No.7. 1279-1285 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Suemasu and T. Kumagai: "Compressive behavior of rectangular composite laminates with multiple circular delaminations II Finite element analysis"AIAA Journal. Vol.36, No.7. 1286-1290 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Suemasu and O. Majima: "Multiple delaminations and their severity in no linear circular plates subjected to transverse loadings"Journal of Composite Materials. Vol.32 No.2. 123-140 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Suemasu: "On an experimental method to measure mode III interlaminar fracture toughness of composite laminates"Composite Science and Technology. Vol.59. 1015-1021 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Suemasu, O. Majima, Y. Aoki: "Instability laminates of multiple penny-shape delamination in composite laminates subjected to quasi-static transverse loading"Journal of Reinforced Plastics, and Composites. Vol.18, No.12. 1156-1169 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O. Majima, H. Suemasu: "A finite element analysis of delamination propagation in composite laminates"Journal of Japan Society of Composite Materials. Vol.25,No.4. 140-149 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Suemasu, T. Kumagai and K Gozu: "Compressive behavior of rectangular composite laminates with multiple circular delaminations I. Experiment and analytical development"AIAA Journal. Vol.36, No.7. 1279-1285 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Suemasu and T. Kumagai: "Compressive behavior of rectangular composite laminates with circular delaminations II. Finite element analysis"AIAA Journal. Vol.36, No.7. 1286-1290 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Suemasu and O.Majime: "Multiple delalninations and their severity in nonlinear circular plates subjected to transverse loadings"Journal of Composite Materials. Vol.32 No.2. 123-140 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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