摘要
提出了适用于陶瓷切口件拉 /扭复合应力下的断裂准则 ,其中不含经验参数。采用具有不同应力集中系数的 Al2 O3陶瓷管状试样 ,在不同的拉 /扭复合应力状态下测定了断裂强度。试验结果证明了该断裂准则的有效性和通用性。利用现有文献中的相关试验结果 ,对上述断裂准则作了进一步的客观校核。根据该断裂准则和陶瓷材料拉伸强度的概率分布参数 ,还可预测陶瓷材料光滑试样和切口件在拉 /扭复合应力下具有存活率的断裂准则。
In the present study, a fracture criterion for ceramics under combined tension/torsion loading is proposed, which does not contain any empirical constants. The fracture strength of Al 2O 3 tubes under combined tension/torsion loading was measured by using test specimens with different stress concentration factors. Test results show that the above criterion is available and generally applicable for both smooth- and notched elements of ceramics. Some existing test results in literature are also used to objectively check the above criterion. Moreover, the fracture criteria of ceramics with given survivability under combined tension/torsion can be predicted from the above fracture criterion and the probability distribution parameters of tensile strength of ceramics. It may be thought that the fracture criterion for ceramics under combined tension/torsion loading proposed in this study is of practical significance in engineering.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2003年第13期1155-1157,共3页
China Mechanical Engineering
基金
国防科技预研基金资助项目(97J12.1.9HK0 31 7)
关键词
断裂准则
AL2O3陶瓷
拉/扭复合载荷
切口件
fracture criterion Al 2O 3 ceramic combined tension/torsion loading notched element
