Strength evaluation of alumina's spray coating (3rd report, proposal for the safety design of fracture strength with consideration of cracks interference)

Tooru Aramaki, Shigeru Hamada, Hiroshi Noguchi, Shinya Miyaji, Toshihiro Tachikawa, Arata Tatsumi, Takashi Kayamoto

Research output: Contribution to journalArticle

Abstract

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, in order to predict fracture strength, crack shape just before brittle fracture in alumina's spray coating single layer is predicted with methods proposed in former report. And statistics method with consideration of fracture toughness scattering is used. In order to predict the crack shape before brittle fracture, image processing software is developed, therefore efficient data processing become possible. Moreover, the proposed fracture strength presumption is done in the standpoint of the safe design and has aimed to presume accuracy good on the safety side. The fracture strengths predicted with the proposed method are almost equal to experimental results obtained by 4-point bending tests. Then flowchart of fracture strength safety design using the proposed method is proposed.

Original languageEnglish
Pages (from-to)855-865
Number of pages11
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume75
Issue number755
DOIs
Publication statusPublished - Jan 1 2009

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Aluminum Oxide
Fracture toughness
Alumina
Cracks
Coatings
Brittle fracture
Bending tests
Crack propagation
Image processing
Statistics
Scattering

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Strength evaluation of alumina's spray coating (3rd report, proposal for the safety design of fracture strength with consideration of cracks interference)",
abstract = "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, in order to predict fracture strength, crack shape just before brittle fracture in alumina's spray coating single layer is predicted with methods proposed in former report. And statistics method with consideration of fracture toughness scattering is used. In order to predict the crack shape before brittle fracture, image processing software is developed, therefore efficient data processing become possible. Moreover, the proposed fracture strength presumption is done in the standpoint of the safe design and has aimed to presume accuracy good on the safety side. The fracture strengths predicted with the proposed method are almost equal to experimental results obtained by 4-point bending tests. Then flowchart of fracture strength safety design using the proposed method is proposed.",
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AU - Aramaki, Tooru

AU - Hamada, Shigeru

AU - Noguchi, Hiroshi

AU - Miyaji, Shinya

AU - Tachikawa, Toshihiro

AU - Tatsumi, Arata

AU - Kayamoto, Takashi

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N2 - 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, in order to predict fracture strength, crack shape just before brittle fracture in alumina's spray coating single layer is predicted with methods proposed in former report. And statistics method with consideration of fracture toughness scattering is used. In order to predict the crack shape before brittle fracture, image processing software is developed, therefore efficient data processing become possible. Moreover, the proposed fracture strength presumption is done in the standpoint of the safe design and has aimed to presume accuracy good on the safety side. The fracture strengths predicted with the proposed method are almost equal to experimental results obtained by 4-point bending tests. Then flowchart of fracture strength safety design using the proposed method is proposed.

AB - 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, in order to predict fracture strength, crack shape just before brittle fracture in alumina's spray coating single layer is predicted with methods proposed in former report. And statistics method with consideration of fracture toughness scattering is used. In order to predict the crack shape before brittle fracture, image processing software is developed, therefore efficient data processing become possible. Moreover, the proposed fracture strength presumption is done in the standpoint of the safe design and has aimed to presume accuracy good on the safety side. The fracture strengths predicted with the proposed method are almost equal to experimental results obtained by 4-point bending tests. Then flowchart of fracture strength safety design using the proposed method is proposed.

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