Foreign object damage in flexure bars of two gas-turbine grade silicon nitrides

被引：41

作者：

Choi, SR ^{[1
]}

Pereira, JM ^{[1
]}

Janosik, LA ^{[1
]}

Bhatt, RT ^{[1
]}

机构：

[1] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 379卷 / 1-2期

关键词：

foreign object damage; silicon nitrides; impact damage; mechanical testing;

D O I：

10.1016/j.msea.2004.03.027

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Foreign object damage (FOD) behavior of two commercial gas-turbine grade silicon nitrides, AS800 and SN282, was determined at ambient temperature through strength testing of flexure test specimens impacted by steel ball projectiles with a diameter of 1.59 mm in a velocity range from 220 to 440 m/s. AS800 silicon nitride exhibited a greater FOD resistance than SN282, primarily due to its greater value of fracture toughness (K-lc) The use of an additional equiaxed, fine-grained silicon nitride (NC132) showed that fracture toughness was a key material parameter affecting FOD resistance. The observed damages generated by projectile impact were typically in the forms of well- or ill-developed ring and cone cracks with little presence of radial cracks. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：411 / 419

页数：9

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