Reliability estimation of contact failure and macroscopic fracture in ceramic ball subjected to thermal shock

2016 Fiscal Year Final Research Report

• Project/Area Number: 26820015
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Numazu National College of Technology
• Principal Investigator: MATSUDA Shinya 沼津工業高等専門学校, 機械工学科, 准教授 (10550460)
• Research Collaborator: NAKADA TAKESHI
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: セラミック球 / 熱衝撃破壊 / リングクラック / 破壊力学 / 強度信頼性

Outline of Final Research Achievements

Strength reliability to contact failure and macroscopic fracture (i.e. thermal shock fracture) of silicon nitride ceramic ball subjected to a single thermal shock load was estimated. First, water-quench test was conducted to obtain thermal shock fracture data. Second, spherical indentation test was conducted for the non-macro cracked fracture ceramic ball after thermal shock to obtain ring crack initiation data. The thermal shock fracture and the ring crack initiation mechanisms were characterized through fracture surface observation and fracture mechanics approach. Finally, strength estimation models to the thermal shock fracture and the ring crack initiation were proposed, respectively.

Free Research Field

材料力学，材料強度学，破壊力学