Experiment on Foreign Object Damage of Gas Turbine-Grade Silicon Nitride Ceramic

Author:

Yoshida Hiro1,Nakashima Takashi2,Yoshida Makoto3,Hara Yasushi4,Shimamori Toru4

Affiliation:

1. AIST, Tsukuba, Japan

2. Kawasaki Heavy Industries, Co. Ltd., Akashi, Japan

3. Kyocera Corporation, Co. Ltd., Kokubu, Japan

4. NGK Spark Plug Co., Ltd., Komaki, Japan

Abstract

A new high quality turbine system using monolithic silicon-nitride ceramic is under development. In this study particle impact tests of the silicon-nitride have been tried at room and elevated temperatures with and without tensile load, which simulates centrifugal force of blade rotation. In the experiment 1 mm diameter particle is impacted at velocities up to 900 m s−1. In this paper, critical velocities for bending fracture and Hertzian cracks are examined. Moreover, strength degradation at elevated temperature and spall fracture of the blade are discussed. The main results are: 1) The bending fracture mode critical impact velocity for soft particles is higher than that for hard particles. 2)The impact parameter ϕ for initiation of Hertzian cracks ranges 1.08×10−5 – 1.56×10−5 for the materials tested. 3)Strength degradation at elevated temperature was clearly observed. 4) In the impact tests on blades spall fracture, which was caused by interaction of stress waves, appeared.

Publisher

American Society of Mechanical Engineers

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. FOD Simulation for Ceramic Turbine Blades;TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES;2006

2. Quantitative analysis of debris clouds from SiC-fiber-reinforced silicon nitride bumpers;International Journal of Impact Engineering;2005-10

3. Summary of CGT302 Ceramic Gas Turbine Research and Development Program;Journal of Engineering for Gas Turbines and Power;2002-06-19

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