摘要
激光冲击黏附力测试可以用来评价多界面材料的界面性能和深入了解激光诱导冲击波下的界面损伤机理。本工作研究激光诱导冲击波作用下钛基碳纤维/环氧复合层板(titanium-based carbon-fiber/epoxy laminates,Ti-CF FMLs)中金属和纤维复合材料胶接界面的损伤机理。结合冲击后的截面形貌分析和界面抗拉强度测试,分析激光冲击参数对层板界面行为的影响。通过建立激光冲击层板的有限元仿真模型,确定对胶接界面损伤最大的激光光斑作用位置,并在此基础上研究试样约束方式对界面损伤的影响。结果表明:随着激光功率密度从1.2 GW/cm^(2)增至7.2 GW/cm^(2),2/1 Ti-CF FMLs的界面抗拉强度由2.92 MPa降至0.11 MPa,3/2 Ti-CF FMLs则由0.138 MPa降至0.015 MPa;对于2/1 Ti-CF FMLs最大界面损伤值始终出现在未冲击侧,3/2 Ti-CF FMLs最大界面损伤值逐渐上移至第三层。当激光光斑中心距层板边界1.5 mm时,界面损伤达到峰值(0.75)。在试样背表面施加约束后,损伤程度相对于未施加约束试样显著减小。通过对Ti-CF FMLs界面损伤过程的分析发现,最大损伤的产生位置与反射卸载波和从正面向自由表面传播的入射卸载波的交会位置有关。
The laser shock adhesion test serves as a reliable method for assessing the interface properties of multi-interface materials,with a profound understanding of the interface damage mechanism under laser shock.In this paper,the damage mechanism at the adhesive interface between metal and fiber composites within titanium-based carbon-fiber/epoxy laminates(Ti-CF FMLs)is investigated.The influence of laser shock parameters on interface damage of laminates is studied by analyzing the cross-section morphologies and measuring interface tensile strength.Additionally,a finite element simulation model is established to pinpoint the laser spot location causing maximal damage to the adhesive interface,and the impact of specimen constraint mode on 2 interface damage is explored.The results show that as laser power density increases from 1.2 GW/cm to 7.2 GW/cm^(2),the interfacial tensile strength of 2/1 Ti-CF FMLs decreases from 2.92 MPa to 0.11 MPa,while for 3/2 Ti-CF FMLs,it decreases from 0.14 MPa to 0.015 MPa.For 2/1 Ti-CF FMLs,the peak interface damage consistently appears on the unimpacted side,whereas for 3/2 Ti-CF FMLs,it progressively shifts upwards to the third layer.When the laser spot’s center is positioned 1.5 mm from the lamellar plate boundary,interface damage peaks at 0.75.Applying constraints to the specimen’s back surface markedly reduces damage compared to unconstrained specimens.Analysis of the Ti-CF FMLs’interface damage process reveals that the site of maximal damage correlates with the intersection of the reflected and incident unloading waves propagating from the front towards the free surface.
作者
张桂
高东
薛景辉
周王凡
ZHANG Gui;GAO Dong;XUE Jinghui;ZHOU Wangfan(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)
出处
《航空材料学报》
北大核心
2025年第4期133-143,共11页
Journal of Aeronautical Materials
基金
国家自然科学基金(52105448)。
