钠钙玻璃的缺日弯曲强度与试样的应力集中系数Kt成反比；而缺口根部断裂应力与Kt无关．如弯曲强度服从Weibull分布，其模量m是材料常数，而标度因子σ0与Kt成反比．如弯曲强度服从正态分布，其平均值及标准差均与Kt成反比，而变异系数为常数．
The flexural strength of soda-lime glass σnb is inversely proportional to the theoretical stress concentration factor
of specimens Kt but the fracture stress at notch root σf(=Ktσnb) is independent of Kt. When the flexural strength follows Weibull distribution, the modulus m is a
material constant but the scale factor σ_0 changes inversely with Kt. When the flexural strength follows Gauss distribution, both
the mean value and the standard diviation of the flexural strength are inversely proportional to the Kt, but the coefficient of variation of the
flexural strength is a material constant.
参考文献
| [1] | Ben-Nissan B. Meter Forum, 1993, 17: 105--112 2 Buxbaum O, Sonsino C M, Esper F J. Int. J. Fatigue, 1994, 16 (4): 257--264 3 Wang F H, Zheng X L, Lu M X. Eng. Fract. Mech, 1995, 52 (5): 917--920 4 文潮, 吕宝桐. 机械科学与技术, 1996, 15 (6): 985--989 5 Kim K T, Suh J. J. Am. Soc. Ceram, 1992, 75 (4): 896--901 6 Quinn G D, Morrell R. J. Am. Ceram. Soc., 1991, 74 (9): 2037--2051 7 西田正孝. 应力集中. 森北出版株式会社, 1971. 8 高镇同. 疲劳应用统计学. 国防工业出版社, 1986. |
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