Premium
A new methodology to guarantee the structural integrity of Al 2 O 3 /SiC composite using crack healing and a proof test
Author(s) -
ONO M.,
NAKAO W.,
TAKAHASHI K.,
NAKATANI M.,
ANDO K.
Publication year - 2007
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2007.01132.x
Subject(s) - materials science , brittleness , composite number , ceramic , structural engineering , composite material , reliability (semiconductor) , structural integrity , stress (linguistics) , bending , sample (material) , flexural strength , fracture (geology) , fracture mechanics , engineering , power (physics) , linguistics , physics , philosophy , chemistry , chromatography , quantum mechanics
Structural ceramics are brittle and sensitive to flaws. As a result, the structural integrity of a ceramic component may be seriously affected by inherent flaws. Self‐crack‐healing is an excellent answer to this problem. At the moment, however, there is no technique to heal embedded flaws. Therefore, a technique to guarantee the reliability of ceramic components is demanded, and thus a technique using crack healing followed by proof test was developed by K. Ando et al. to accomplish this. With this technique, testing the mechanical behaviour of the crack‐healed zone is very important for ensuring the structural integrity of a ceramic component. In this study, first Al 2 O 3 /SiC composite with an excellent crack‐healing ability was sintered. Second, a crack was introduced on the sample (3 mm × 4 mm × 36 mm), which reduced the bending strength by about 80%, and subsequently the crack was healed. Third, a proof test was carried out on the crack‐healed sample. Last, using the crack‐healed and proof‐tested sample, a fracture test was carried out up to 1373 K. The measured minimum fracture stress (σ Fmin ) was compared with the theoretical minimum strength (σ G ) from room temperature (R.T.) to 1373 K. It was concluded that σ G showed good agreement with σ Fmin up to 1373 K and that the crack healing followed by proof test was an excellent technique to increase the survival probability by administering a proof test and to guarantee the reliability of Al 2 O 3 /SiC composite.