摘要
基于实桥的缆索钢丝裂纹"先圆后扁"的扩展特征规律,提出了一种实用的拟合几何修正系数,将圆形前锋裂纹与直线形前锋裂纹的公式拟合,评估悬索桥主缆的带裂缝的钢丝断裂强度.该公式简单实用,计算精度令人满意,为缆索钢丝的剩余强度评估提供了快速途径.计算结果表明,断裂韧性方法比净截面理论更适合有裂缝钢丝的失效分析.
A practical normalized stress intensity factor is stated in this paper on the basis of the evolution of cracks of cable wires,which fits the crack growth behavior for a semicircular crack and for straight crack.Example testifies that the fracture strength of a cable wire with a surface crack can be assessed conveniently and the result can be acquired with satisfactory precision by this convenient and practical method.And the fracture toughness criterion is more realistic for the fracture strength of the wire.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第8期1010-1013,1108,共5页
Journal of Tongji University:Natural Science
基金
国家"十一五"科技支撑计划资助项目(2006BAG04B01
2006BAG04B02)
国家"八六三"高技术研究发展计划资助项目(2007AA11Z104)
上海市科委重点攻关资助项目(072112005)
江苏省交通科学研究计划资助项目(05Y50)
关键词
圆形裂纹
直线形裂纹
净截面理论
断裂韧性
semicircular crack
straight crack
net section theory
fracture toughness
