Effect of Thermal Residual Stress on Matrix Cracking Strain and Fracture Behavior of the Sintered SiC Fiber Reinforced SiO 2-Mullite Composites

Kenya Nagahisa, Kazuteru Iwamoto, Kenji Shinozaki, Gen Sasaki, Manabu Enoki, Makoto Yoshida

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The sintered SiC fiber reinforced SiO 2-mullite composites with matrix compositions, i.e., SiO 2-3.7, 30, and 50 mol%Al 2O 3, had already been developed. In these composites, the thermal residual stress field changed with an increase in the coefficient of thermal expansion of the matrix accompanied by an increasing Al 2O 3 content (mullite volume fraction) in the matrices. A three-point flexural test was conducted for the composites at room temperature. The strain gauge method and AE monitoring were used to detect the matrix cracking strain during the test. The effect of the thermal residual stress on the matrix cracking strain and fracture behavior were investigated. The results are as follows. The matrix cracking strain observed in the composites with a higher tensile thermal residual stress in the matrix region parallel to the fiber axis was well predicted by the BHE theory. For the SiC fiber/SiO 2-50 mol%Al 2O 3 composite, the first acoustic emission signal was detected just after the initial proportional limit of the stress-strain curve. For the other composites, the signals were detected below this limit. When the residual stress in the matrix region parallel to the fiber axis was compressive, the linear fracture behavior was found. On the contrary, the bi-linear fracture behavior was enhanced by the tensile residual stress in the matrix. This tendency agreed with the prediction method by Luh and Evans. The magnitude of the fracture energy obtained in each composite was qualitatively explained by the conventional theoretical formula.

Original languageEnglish
Pages (from-to)172-180
Number of pages9
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume68
Issue number2
Publication statusPublished - 2004 Feb
Externally publishedYes

Fingerprint

Mullite
thermal stresses
Thermal stress
residual stress
Residual stresses
composite materials
fibers
Fibers
Composite materials
matrices
proportional limit
aluminosilicate
Fracture energy
strain gages
acoustic emission
Stress-strain curves
Acoustic emissions
Strain gages
tensile stress
Tensile stress

Keywords

  • Acoustic emission (AE)
  • Ceramic matrix composite (CMC)
  • Fracture behavior
  • Matrix cracking
  • Thermal residual stress

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Effect of Thermal Residual Stress on Matrix Cracking Strain and Fracture Behavior of the Sintered SiC Fiber Reinforced SiO 2-Mullite Composites. / Nagahisa, Kenya; Iwamoto, Kazuteru; Shinozaki, Kenji; Sasaki, Gen; Enoki, Manabu; Yoshida, Makoto.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 68, No. 2, 02.2004, p. 172-180.

Research output: Contribution to journalArticle

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abstract = "The sintered SiC fiber reinforced SiO 2-mullite composites with matrix compositions, i.e., SiO 2-3.7, 30, and 50 mol{\%}Al 2O 3, had already been developed. In these composites, the thermal residual stress field changed with an increase in the coefficient of thermal expansion of the matrix accompanied by an increasing Al 2O 3 content (mullite volume fraction) in the matrices. A three-point flexural test was conducted for the composites at room temperature. The strain gauge method and AE monitoring were used to detect the matrix cracking strain during the test. The effect of the thermal residual stress on the matrix cracking strain and fracture behavior were investigated. The results are as follows. The matrix cracking strain observed in the composites with a higher tensile thermal residual stress in the matrix region parallel to the fiber axis was well predicted by the BHE theory. For the SiC fiber/SiO 2-50 mol{\%}Al 2O 3 composite, the first acoustic emission signal was detected just after the initial proportional limit of the stress-strain curve. For the other composites, the signals were detected below this limit. When the residual stress in the matrix region parallel to the fiber axis was compressive, the linear fracture behavior was found. On the contrary, the bi-linear fracture behavior was enhanced by the tensile residual stress in the matrix. This tendency agreed with the prediction method by Luh and Evans. The magnitude of the fracture energy obtained in each composite was qualitatively explained by the conventional theoretical formula.",
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