摘要
采用基于扫描电子显微镜(SEM)的原位拉伸试验和数字图像处理方法,研究玻璃钢夹砂管(FRPM管)层间界面破坏及力学特性。结果表明,试样失效破坏主要表现为层间界面及其局域发生损伤开裂;由SEM实时观测试样层间界面损伤行为表现为近界面端大而凸的颗粒先发生脱湿,附近区域颗粒相互作用,颗粒/基体界面大范围脱粘并贯穿至树脂基体内部,最终宏观表现为层间分离,而远界面颗粒对界面开裂几乎无影响;由数字图像处理发现远界面域颗粒脱湿不严重,近界面域颗粒/基体界面脱湿明显,所在区域应变场不断增大表现为裂纹萌生扩展形成裂缝。随外界拉伸应变的增大,试样应变场呈非均匀分布,最大应变处均在近界面颗粒区域,确定层间界面损伤的破坏范围为近界面区域735~940px。
This study investigates interlayer interface failure mechanisms and mechanical properties of fiberglass‐rein‐forced plastic mortar(FRPM)pipes through in‐situ tensile testing coupled with scanning electron microscopy(SEM)and digital image correlation analysis.Experimental results indicated that failure primarily occurred through interlayer in‐terface damage and localized cracking.Real‐time SEM observations demonstrated a progressive failure sequence:(1)ini‐tial debonding of large,convex particles at the near‐interface region,(2)subsequent particle interactions in adjacent ar‐eas,and(3)extensive particle/matrix interface debonding propagating into the resin matrix,ultimately causing interlay‐er separation.Notably,far‐interface particles showed minimal influence on crack initiation.Digital image analysis further indicated that while far‐interface domains experienced negligible debonding,near‐interface regions developed significant particle/matrix separation,where continuously increasing strain fields initiated and propagated cracks.Under increasing tensile strain,specimens exhibit non‐uniform strain distribution,with maximum strain concentration occurring in near‐in‐terface particle zones.Quantitative analysis established the critical damage region within 735~940 pixels from the inter‐face.
作者
胡立周
孙颖晖
贾莹洁
王清洲
HU Lizhou;SUN Yinghui;JIA Yingjie;WANG Qingzhou(School of Civil and Transportation,Hebei University of Technology,Tianjin 300401,China;State Railway Engineering Supervision(Beijing)Co,Ltd,Beijing 100000,China)
出处
《中国塑料》
北大核心
2025年第8期69-74,共6页
China Plastics
基金
河北省“三三三人才工程”资助项目(C20221038)。
关键词
玻璃钢夹砂管
层间界面
力学特性
原位拉伸试验
数字图像处理
fiberglass reinforced plastic mortar pipe
interlaminar interface
mechanical property
in‐situ tensile test
digital image processing
