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1995 Fiscal Year Final Research Report Summary

Residual Stresses and Theomomechanical Behavior of Fiber-Reinforced Aluminum Composites

Research Project

Project/Area Number 06650123
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionNihama National College of Technology

Principal Investigator

IKEUCHI Yasukazu  Niihama National College of Technology, Materials Science and Engineering, Professor, 材料工学科, 教授 (20044092)

Project Period (FY) 1994 – 1995
KeywordsFiber-reinforced aluminum / X-ray stress measurement / Thermal residual stress / Thermal expansion / Alumina fiber / SiC fiber
Research Abstract

When a fiber-reinforced metal matrix composite is cooled down to room temperature from the fabrication or annealing temperature, residual stresses are induced in the composite because of the thermal expansion mismatch between matrix and fiber. An X-ray diffraction technique was used to measure thermal residual stresses in the matrix of two different composite systems, the first being pure aluminum or an Al-5%Cu alloy reinforced with 17-mum small diameter gamma-Al_2O_3 fibers and the second being a 6061Al alloy reinforced with 140-mum large diameter SiC_<CVD> fibers.
The triaxial state of the matrix thermal residual stress in each composite was determined. In the matrix of each annealed composite a tensile residual stress state was observed. On the measurement after cooling the annealed composite to liquid nitrogen temperature, the matrix showed a compressive stress state in each composite. In both of the matrix stress states, the longitudinal residual stress parallel to the fibers was the maximum principal stress. In the case of the composites with small diameter fibers, the stress measured normally to the surface was found to be about a half of the transverse residual stress. This can be due to the relaxation of the component of residual stress in the matrix near the surface layr.
It was confirmed that the thermal residual stress as well as the composite length depended upon the thermal history of the composite. Dimensional stability of a composite should be evaluated on the basis of the thermal residual stresses in the composite. The in-situ X-ray technique was found to be useful for deeper understanding the behavior of the thermally induced residual stresses in the composite.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 池内保一: "アルミナ繊維強化Al-5%Cu複合材料における熱誘起応力" 新居浜工業高等専門学校紀要(理工学編). 30. 72-80 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yasukazu IKEUCHI: "X-Ray Evaluation of Thermally Induced Stresses in Heat-Treated Alumina Fiber-Reinforced Al-5%Cu Alloy" Proceedings of the fourth International Conference on Residual Stresses. 732-740 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池内保一: "アルミナ長繊維強化アルミニウム複合材料における熱残留応力のX線3軸解析" 材料. 43. 792-798 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yasukazu IKEUCHI: "X-Ray Evaluation of Thermal Stresses in Continuous Alumina Fiber-Reinforced Aluminum" Proc.of the 1st International Symposium on Thermal Stresses,Journal of Thermal Stresses Organizing Committee. 377-380 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yasukazu IKEUCHI: "Evaluation of Thermally Induced Stress in Alumina Fiber Reinforced Al-5%cu Composite" The Memoirs of Niihama National College of Technology (Science and Engineering).Vol.30. 72-80 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasukazu IKEUCHI: "X-Ray Evaluation of Thermaly Induced Stresses in Heat-Treated Alumina Fiber-Reinforced Al-5%Cu Alloy" Proceedings of The Fourth International Conference on Residual Stresses. The Society for Experimental Mechanics. 732-740 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasukazu IKEUCHI: "X-Ray Triaxial Evaluation of Thermal Residual Stresses in Continuous Alumina Fiber Reinforced Aluminum Composite" Journal of The Society of Materials, Science JAPAN. Vol.43-No.490. 792-798 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasukazu IKEUCHI: "X-Ray Evaluation of Thermal Stresses in Continuous Alumina Fiber-Reinforced Aluminum" Proc.of the 1st International Symposium on Thermal Stresses, Journal of Thermal Stresses Organizing Committee. 377-380 (1995)

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

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Published: 1999-03-09  

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