GFRP-轻木断芯梁界面剥离静力及疲劳试验
Static and fatigue tests of interface peeling of GFRP-balsa broken core beam
裴涛 1史慧媛 1唐柏鉴 1夏志远 1严少聪1
作者信息
- 1. 苏州科技大学土木工程学院,江苏苏州 215011
- 折叠
摘要
以工程适用的玻璃纤维增强复合材料(GFRP)-轻木夹芯结构为研究对象,设计了含界面和芯材裂纹的"断芯梁"试件;通过三点弯静力及疲劳试验研究了 GFRP-轻木夹芯结构界面剥离破坏的规律,获得了不同跨高比、应力比及荷载等级下试件的a-N曲线,分析了不同参数对界面疲劳剥离破坏的影响;基于帕里斯理论建立了疲劳裂纹扩展速率模型.结果表明:所设计的断芯梁试件能够获得稳定的界面裂纹扩展;疲劳试验中,界面剥离破坏出现明显的"三阶段"特征,疲劳裂纹剥离速率分别随应力比减小、荷载等级增大呈现增加趋势;以应变能释放率变程为控制参量的疲劳裂纹扩展速率模型可较好地描述界面剥离过程.
Abstract
A"broken core beam"specimen with interfacial and core material cracks was designed based on the engineering applicable glass fiber reinforced composite(GFRP)-light wood sandwich structure.The regularity of the interfacial peeling failure of GFRP light wood sandwich structures was studied through three-point bending static and fatigue tests,the a-N curves of specimens under different span height ratios,stress ratios,and load levels were obtained,and the effects of different parameters on interfacial fatigue peeling failure were analyzed;and a fatigue crack growth rate model was established based on Paris theory.The results show that the designed broken core beam specimen can achieve stable interfacial crack growth;in fatigue tests,the interfacial peeling failure exhibits a distinct"three stage"characteristic,and the fatigue crack peeling rate increases with the de-crease of stress ratio and the increase of load level,respectively;the fatigue crack growth rate model using the strain energy release rate range as the control parameter can better describe the interfacial stripping process.
关键词
复合材料/夹芯结构/界面剥离/疲劳/a-N曲线Key words
composite materials/sandwich structure/interface stripping/fatigue/a-N curve引用本文复制引用
基金项目
国家自然科学基金(52108236)
国家自然科学基金(52208188)
江苏省自然科学基金(BK20200986)
出版年
2024
NETL
NSTL
万方数据