FRP加固金属裂纹板的断裂力学分析  

FRACTURE MECHANICS ANALYSIS OF CRACKED METALLIC PLATES REPAIRED WITH FRP

作　　者：彭福明[1] 岳清瑞[1] 杨勇新[1] 张晓欣[1] 

机构地区：[1]中冶集团建筑研究总院,北京100088

出　　处：《力学与实践》2006年第3期34-39,共6页Mechanics in Engineering

基　　金：国家863计划项目(2001AA336010);国家自然科学基金项目(50238030);2004年科研院所技术开发研究专项资金项目(2004EG213024)资助.

摘　　要：传统的金属结构加固方法会形成新的疲劳源,而粘贴FRP加固则具有明显的优势．提出了“三维实体-弹簧-壳元”有限元模型,金属板采用三维实体单元, FRP采用壳单元,用弹簧单元来模拟FRP与金属板之间的胶层,对金属裂纹板粘贴FRP加固后的性能进行了线弹性断裂力学分析,并对影响金属板裂纹前缘应力强度因子的参数进行了讨论．分析结果表明,采用高弹性模量的FRP和增加FRP的厚度对改善加固效果非常明显．There are several advantages of adhesively bonded fiber reinforced polymer （FRP） laminates used for the deteriorated metallic members over the traditional retrofit methods susceptible to fatigue crack initiation. The three dimensional ＂solid-spring-shell element＂ finite element model is presented in the paper. In the FEM model, the metalic plate is modeled as a solid element, FRP is modelled as a shell element and the spring element is used to model the adhesion between the metalic plate and FRP. Linear fracture mechanics analysis of cracked metallic plates repaired with FRP is carried out. Influencing factors on the stress intensity factors at crack tips are discussed. It is shown that the increases in the elastic modulus or the thickness of FRP improve the effectiveness of strengthening significantly.

关 键 词：纤维增强复合材料 金属裂纹板 线弹性断裂力学 应力强度因子 约束方程 

分 类 号：O346.1[理学—固体力学] TG14[理学—力学]