摘要
采用边界元法软件BEASY对钢板Ⅰ/Ⅱ复合型疲劳裂纹的扩展进行数值模拟,其中等效应力强度因子与裂纹扩展率分别采用Tanaka公式与Paris公式计算。比较了最大周向应力准则与最小应变能密度准则对裂纹形态的影响。鉴于纤维增强复合材料(FRP)的多样性,对比了两种不同弹性模量FRP材料对钢板的补强效果。对预应力改善钢板疲劳性能进行参数分析,结果显示:粘贴预应力FRP能提高钢板疲劳寿命,而且随着预应力的增大改善效果将更为显著。
Boundary element method was applied to the simulation of mixed-mode fatigue crack propagation in steel panel with software program BEASY. Effective stress intensity factor and crack growth rate were calculated by using Tanaka formula and Paris law. The effects of maximum circumferential stress criterion and minimum stress energy density criterion on crack propagation were compared. Considering the diversity of FRP,two kinds of FRP with different elastic modulus were used. Finally,a parametric analysis was conducted to investigate the influence of prestressing level. The results showed that the enhancement of fatigue properties was achieved with the increase of prestressing.
作者
张柠溪
陈涛
Zhang Ningxi Chen Tao(Department of Structual Engineering, Tongji University, Shanghai 200092, Chin)
出处
《钢结构》
北大核心
2017年第1期31-35,68,共6页
Steel Construction
