Improvement of Critical Stress for Crack-Healing of Si₃N₄/SiC by Shot Peening

• NAKAGAWA Satoshi

  横浜国立大学大学院 工学府

• TAKAHASHI Koji

  Faculty of Engineering Yokohama National University

• OSADA Toshio

  横浜国立大学 共同研究推進センター

• SAITO Shinji

  日本発条（株） 研究開発本部

Bibliographic Information

Other Title

• ショットピーニングによる窒化ケイ素／炭化ケイ素複合材のき裂治癒可能な限界応力の向上

Abstract

Effect of shot peening on the critical stress for crack-healing of Si₃N₄/SiC composite ceramics was investigated. Shot peening was carried out on the Si₃N₄/SiC composite with a surface crack by Yittorium stabilized Zirconia beads.<br>Peend specimens were healed at 1100 °C for 5 hours in air under constant tensile stress σ_app ranging from 0 to 500 MPa. The result clearly showed that peend specimens could heal the surface crack completely under the σ_app ≤ 450 MPa. Thus, critical stress of the specimens was determined to be σ^C_app = 450 MPa. This σ^C_app was 2.3 times higher than that of un-peened specimen. Furthermore, the σ^C_app of both specimens showed the proportional relationship to bending strength of cracked specimen σ_c (σ^C_app ~ 0.64σ_c). Therefore, it can be concluded that the improved σ^C_app of the peened specimen is due to the compressive residual stress and, consequently, increment of σ_c.

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 79 (802), 697-701, 2013

  The Japan Society of Mechanical Engineers

Keywords

• Ceramics
• Composite Material
• Crack-Healing
• Shot Peening
• Residual Stress
• Critical Stress

Details

• CRID: 1390001204477259904
• NII Article ID: 130003374644
• DOI: 10.1299/kikaia.79.697
• ISSN: 18848338
• ISSN: 03875008
• Web Site: https://www.jstage.jst.go.jp/article/kikaia/79/802/79_697/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed