摘要
本文通过四荷载V氏压痕玻璃方板,在空气中利用四种加载速率的同轴双环弯曲动疲劳试验,发现玻璃强度与加载速率成正比例关系,并得出结论:高强度区的破坏是由尖裂纹萌生造成的;低强度区的破坏是由亚临界裂纹扩展所致。根据试验结果,利用自编的多项式曲线拟合程序,求得破坏荷载及破坏时间的Weibull分布模数m。利用动疲劳强度与加载速率的关系,求得裂纹扩展参数n,并评价了玻璃使用的可靠性问题。
Glass's strength is found to be in direct proportion of Loading velocity in this paper,from ring-ring flexure glass square plate dynamic fatigue test for four indentation in four loading velocities. The conclusion is gotten as follow: in the high strength regime, faiture is controlled bycrack initiation; in low strength regime, failure is caused by subcritical crack growth. In terms oftesting results, the Weibull distribution module(m) of failure strength and failure time in above con-dition is calculated by using the multionomial curve fitting program. In the light of the relation ofdynamic fatigue strength and loading velocity, the crack growth parameter(n) is calculated. The re-liability of glass using in some conditions is appraised.
基金
国家建材局行业基金科研成果.
