TY - JOUR
T1 - Strength evaluation of alumina's spray coating (2nd report, proposal for judgments of crack interference and correction methods of crack shape)
AU - Aramaki, Tooru
AU - Hamada, Shigeru
AU - Noguchi, Hiroshi
AU - Miyaji, Shinya
AU - Tachikawa, Toshihiro
AU - Tatsumi, Arata
AU - Kayamoto, Takashi
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2009/7
Y1 - 2009/7
N2 - Alumina's spray coating is material including a lot of pores (cracks) and cracks interference exists in the alumina's spray coating, therefore the crack's interference leads to decrease the fracture strength. There are some reports to analyze by using the elastic analysis for two or more cracks. Moreover, there are some standards about union condition of the cracks. However in ceramics including alumina, the study of quantifying an internal spread of the crack when interfering and presuming static fracture strength with judgment of the crack interference after the stable crack propagation is hardly known. In this report, after the alumina's spray coating single layer is taken out, Vickers indentation crack is introduced, 4-point bending test is performed and R-curve is acquired. As a result, the fracture strength characteristic of the alumina's spray coating single layer is clarified. Then, three judgments of the crack interference with the i?-curve are proposed. Moreover, correction methods of crack shape when the cracks interfere are proposed. The validities of the proposals are verified with bending tests after two Vickers indentation cracks have been introduced.
AB - Alumina's spray coating is material including a lot of pores (cracks) and cracks interference exists in the alumina's spray coating, therefore the crack's interference leads to decrease the fracture strength. There are some reports to analyze by using the elastic analysis for two or more cracks. Moreover, there are some standards about union condition of the cracks. However in ceramics including alumina, the study of quantifying an internal spread of the crack when interfering and presuming static fracture strength with judgment of the crack interference after the stable crack propagation is hardly known. In this report, after the alumina's spray coating single layer is taken out, Vickers indentation crack is introduced, 4-point bending test is performed and R-curve is acquired. As a result, the fracture strength characteristic of the alumina's spray coating single layer is clarified. Then, three judgments of the crack interference with the i?-curve are proposed. Moreover, correction methods of crack shape when the cracks interfere are proposed. The validities of the proposals are verified with bending tests after two Vickers indentation cracks have been introduced.
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U2 - 10.1299/kikaia.75.845
DO - 10.1299/kikaia.75.845
M3 - Article
AN - SCOPUS:70349630169
SN - 0387-5008
VL - 75
SP - 845
EP - 854
JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
IS - 755
ER -