セラミックタービン翼の粒子衝突強度向上に関する研究(第一報)

概要

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Aiming at improving the strength of ceramic turbine blades against the impact of foreign objects, several impact tests were carried out, in which a small Si_3N_4 particle was projected onto a Si_3N_4 test specimen at a given speed. Under a laser microscope, the local damage introduced into the specimen was inspected, and residual flexural strength was measured using a 4-point bending test apparatus. Then, the relationship between this damage and residual strength was investigated. Next, these experimental results were compared with the results obtained from similar impact tests with the same specimen materials reported in several past studies. It was found that the residual strength of the specimen impacted at a rather low speed range is markedly low, and that the phenomena of the occurrence of ring cracks are quite different from those shown in such studies. These differences may result from the very slight differences in material property between the spheres used in each impact test. Further investigations on the effects of the relative relationships between the material properties of specimens and spheres on the foreign object damage (FOD) would be necessary, because FOD is the result of the complicated dynamic response of the specimen and sphere.
東海大学の論文
2004-03-31