A Novel Test Method to Measure the Fracture Toughness of Ceramic Balls Used in Bearings
A Novel Test Method to Measure the Fracture Toughness of Ceramic Balls Used in Bearings
复制标题
测量轴承用陶瓷球断裂韧性的新方法
DOI：
10.1115/wtc2005-64189
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. O'brien
中科院分区：
文献类型：
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作者：
M. O'brien
一种新的机械测试已经开发出来，用于测量现代混合轴承中使用的氮化硅球的断裂韧性，对于许多国防，空间和工业应用都很重要。球被压缩成直径在两个半球一致的模具，这导致球的赤道膨胀，产生一个拉伸环应力。在外加荷载作用下，赤道处的预裂缝增大。为了计算裂纹失稳时球的断裂韧性，采用“两点加半椭圆”法对应力场进行有限元计算，并对应力强度因子进行解析求解。新技术似乎比用于测量陶瓷韧性的压痕技术更精确。ASME版权所有©2005
A novel mechanical test has been developed to measure the fracture toughness of the silicon-nitride balls used in modern hybrid bearings important for many defense, space and industrial applications. The ball is compressed diametrally between two hemispherical conforming dies, which causes the ball’s equator to bulge, generating a tensile hoop stress. Under applied load, a precrack placed at the equator grows. To calculate the ball’s fracture toughness at crack instability, finite element calculations of the applied stress field and an analytical solution for the stress intensity factor are used in the “two point plus semiellipse” method. The new technique appears more accurate than the indentation technique used to measure the toughness of ceramics.Copyright © 2005 by ASME
Tada, H.：“感觉形态和精神负荷对眨眼率的影响。”
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