14 April 2010 Effects of residual stress on crack growth of silicon nitride balls under cyclic pressure loads
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Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752225 (2010) https://doi.org/10.1117/12.851650
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore
Abstract
In order to examine the mechanism of splitting failures of silicon nitride balls under cyclic pressure loads, we carried out the fatigue tests of pre-cracked balls. In our previous works, we discovered that splitting failures of the balls were caused by pre-cracks which were initiated on their equators by Vickers indenter. In the present work, in order to further investigate this phenomenon, we carried out fatigue tests of two size balls (4.762mm and 9.525mm). We focus on the growth behavior of cracks whose initial length ranged from 0.260 to 0.290μm and discuss about the effects of ball diameters on the fatigue strength. Based on the empirical features of the two balls, we found that the initial threshold limits of the equivalent stress intensity factor ranges ▵Keq for each ball were different. In order to look into this, we measured the residual stresses using the X-ray stress measuring method.
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Junnosuke Koga, Katsuyuki Kida, Edson Costa Santos, "Effects of residual stress on crack growth of silicon nitride balls under cyclic pressure loads", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752225 (14 April 2010); doi: 10.1117/12.851650; https://doi.org/10.1117/12.851650
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