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2000 Fiscal Year Final Research Report Summary

Mesoscopic Modelling of Damage in Composite Materials

Research Project

Project/Area Number 10650094
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MOTOGI Shinya  Osaka City University, Department of Intelligent Materials Engineering, Professor, 工学部, 教授 (40221626)

Project Period (FY) 1998 – 2000
KeywordsDamage / Composite materials / Ultrasonic nondestructive evaluation / Damage mechanics / Constitutive equation / Lamb wave / Random particulate camposites / Interfacial cracking damage
Research Abstract

In this research, two types of damage are focused on ; one is the transverse cracking damage in FRP crossply laminates, the other is particle-matrix interfacial cracking damage. For the transverse cracking in FRP, obtained results can be summarized as follows :
1) The average stress in cracking layer decreases with development od cracking, and then the constitutive equation of the cracking layer can be described by the so-called work-softening material.
2) The modern plasticity theory can be applied to the cracking layer and the uncracked layer can be regarded as anisotropic elastic material, then these are combined to give a laminate with the aid of lamination theory.
3) Using the above formulation, crack development and degradation of elastic stiffnesses are compared with experiments and give good correspondence.
4) Lamb wave velocity in damaged laminates can be calculated and a comparison with experiment was excellent.
For the interfacial cracking in random particulate composites is suumarized as follows :
1) A release agent can be used as the controller of the interfacial strength in making the material.
2) The stress-strain curve shows large nonlinearity because of development of interfacial cracking damage, and as a result, elongation at failure increases as the interfacial cracking strength decreases.
3) Wave propagation velocities and acoustic anisotropy are caculated and these also agrees well with experimental results.
These results are a base for nondestructive damage evaluation in composite materials, and they contribute to improvement in reliability of composites.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] S.MOTOGI: "Thermal Fatigue Mechanism of Ramdom Particulate Composite"Proc.1^<st> Asia-Australasia Conf.On Comp.Mat.. Vol.II. 731-1-731-4 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.WADA: "Damage Mechanics Approach to Nonlinear Behavior of FRP Laminates with Cracking Layers"Advanced Composite Materials. Vol.8,No.3. 217-234 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 和田明浩: "損傷力学的手法による複合材料積層板の弾性率低下予測"材料. Vol.48,No.5. 454-458 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.WADA: "Damage Mechanics Formulation of the Crack Evolution Process in Composite Laminates under Plane Stress Conditions"J.Reinforced Plastics and Composites. Vol.19,No.3. 219-229 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 和田明浩: "FRP直交積層板の曲げによるき裂損傷発達のモデル化"材料. Vol.49,No.5. 494-501 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.MOTOGI: "Modelling and Ultrasonic Evaluation of Interfacial Cracking Damage in Random Particulate Composites"Proc.2^<nd> Asia-Australasia Conf.On Comp.Mat.. 811-818 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinya MOTOGI: "Thermal Fatigue Mechanism of Ramdom Particulate Composite"Proc. 1^<st> Asia-Australasia Conf. On Comp.Mat.. Vol.II. 731-1-731-4 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akihiro WADA: "Damage Mechanics Approach to Nonlinear Behavior of FRP Laminates with Cracking Layers"Advanced Composite Materials. Vol.8, No.3. 217-234 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akihiro WADA: "Prediction of Elastic Stiffness Degradation in Composite Laminates using Damage Mechanics"Zairyou. Vol.48, No.5. 454-458 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akihiro WADA: "Damage Mechanics Formulation of the Crack Evolution Process in Composite Laminates under Plane Stress Conditions"J.Reinforced Plastics and Composites. Vol.19, No.3. 219-229 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akihiro WADA: "Modelling of Damage Evolution in Bending of FRP Crossply Laminates"Zairyou. Vol.49, No.5. 494-501 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinya MOTOGI: "Modelling and Ultrasonic Evaluation of Interfacial Cracking Damage in Random Particulate Composites"Proc. 2^<nd> Asia-Australasia Conf.On Comp.Mat.. 811-818 (2000)

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

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Published: 2002-03-26  

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