摘要
为探讨带切口陶瓷试件的最大承载力计算方法,采用实验机对7种不同切口尺寸的粗瓷矩形截面梁试件和4种切口尺寸的细瓷试件进行了三点弯曲加载实验,得到了各个试件的载荷—加载点位移关系曲线,并由实验最大载荷值和预制裂纹尺寸计算了其应力强度因子.通过黏聚裂纹模型和双K断裂准则计算弯曲切口梁的承载力,再由恒定应力强度因子计算该结构的承载力,并分别与实验载荷作比较.结果表明,由黏聚裂纹理论和双K断裂准则得到的计算值与实验结果符合较好.
In order to investigate the calculation method of maximum load hearing capacity of ceramics with notch, coarse porcelain beam specimens and fine porcelain specimens with different notch were tested under three--point bending load. A series of curves of load-displacement were obtained for each specimen; the stress intensity factors were calculated through the maximum tested load value and the initial crack length. Two kinds of method were applied to Calculate the load bearing capacity, one of which was about the length of cohesive crack and double-K criteria, and the other one was about the constant stress intensity factor. Then the two methods were compared with each other, and the relative errors were determined between theoretical value and experimental value. The results show that the first method is better than the Second one.
出处
《山东理工大学学报（自然科学版）》
CAS
2008年第5期1-5,10,共6页
Journal of Shandong University of Technology:Natural Science Edition
基金
国家自然科学基金资助项目(10272068)
山东省自然科学基金资助项目(Y2006A29)
关键词
陶瓷断裂实验
三点弯曲梁
应力强度因子
双K断裂参数
承载力
ceramics fracture experiment
three-point bending beam
stress intensity factor
double-K fracture parameters~ load bearing capacity
