摘要
近年来玻璃纤维树酯复合材料(GFRP)广泛应用于各类工程领域,它在服役环境中的性能劣化过程相对复杂,需要联系其宏微观特征变化进行深入研究。利用纳米压痕技术测试GFRP中各组分的微观力学性能有助于建立材料微观与宏观尺度之间性能的相互联系,为深入探讨GFRP的性能演化提供依据。然而,在利用纳米压痕对GFRP进行检测过程中,由于约束效应、树酯堆积效应和粘弹性效应等作用的影响,会导致测量值与真实结果之间产生偏差。本文从纳米压痕技术的基本原理入手,对其在测试GFRP内玻璃纤维、树酯基体和界面三类区域时的既有研究进行归纳总结,逐一分析导致测量误差的原因并提出了相应的解决方案或研究方向。在引起测量误差的各类原因中,树酯堆积效应和粘弹性效应将导致树酯部分的测量结果偏高,但对纤维的测量结果几乎不会产生影响。纤维约束效应对GFRP各区域纳米压痕结果的准确性均有明显影响,且通过理论分析可知纳米压痕测试中约束效应对测试结果的影响普遍存在于所有复合材料之中。为探析此效应对测试结果的影响,已有学者展开了实验和模拟研究,但既有研究对数据结果的分析较为浅显,尚未形成完整体系。鉴于约束效应对测量结果的影响,本文还对GFRP中纤维和树酯的界面状态进行了初步的理论分析。最后,为更加准确地表征GFRP的微观性能,笔者还在后续所需要深入探讨的研究方向中提出了相关建议。
Glass fiber reinforced polymer(GFRP)has been widely used in various engineering fields,and its performance degradation under multiple types of service condition is relatively complex,which needs to be further explored from its macro and micro characteristic performances.Nanoindentation is a meaningful technique for getting micromechanical properties of GFRP components so as to establish their relationships with the overall mechanical performances of the GFRP in macroscale and provides a basis for further study on changes in GFRP during service.In actual detection process,due to the influences of constraint effect,pile-up effect and viscoelastic effect,testing errors between the as-measured and the real values cannot be completely avoided and may lead to misunderstanding of the obtained results.In this paper,principle of the nanoindentation technology is firstly introduced,based on which existing researches in testing regions of the GFRP,viz.glass fiber,resin matrix and their interphase,are reviewed.Also,reasons of measurement errors are discussed and their corresponding solutions or research directions are raised.Among the reasons of the caused errors,the pile-up and the viscoelastic effects of resin would lead to higher as-measured results,but merely influent the fiber results.The fiber constraint effect has a more obvious influence on results of all the regions in GFRP.Theoretical analyses prove that this constraint effect should exist in all types of composite materials,including GFRP.To minimize influence of the constraint effect,scholars have carried out both experimental and simulation studies,however,the current analyses are still superficial without any systematic outcome.Due to the influences of the constraint effect on as-measured results,initial theoretical analysis on properties of the interface between fiber and resin matrix is also carried out.Meanwhile,to facilitate an accurate analysis on micro-properties of GFRP,further relevant study directions regarding this application are also proposed.
作者
王耀城
刘定坤
刘伟
吕阳
郑愚
WANG Yaocheng;LIU Dingkun;LIU Wei;LYU Yang;ZHENG Yu(Key Laboratory for Resilient Infrastructures of Coastal Cities,Ministry of Education,Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 508160,China;State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology),Wuhan 430070,China;School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523830,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第19期19214-19222,共9页
Materials Reports
基金
国家自然科学基金面上项目(51520105012,51678368)
广东省基础与应用基础研究基金项目(2019A1515012014)
硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2019-13)。
关键词
玻璃纤维树酯复合材料
纳米压痕
微观力学性能
约束效应
glass fiber reinforced polymer
nanoindentation
micromechanical properties
constraint effect
