摘要
复合材料的承载能力对于低速冲击损伤非常敏感,复合材料冲击后压缩强度的预测对其工程应用至关重要。为此本文进行了三种不同铺层的碳纤维/环氧树脂5284RTM/U3160层合板目视可检损伤状态下剩余压缩强度试验。压缩试验前通过C扫获得了不同铺层层合板冲击损伤形貌,并基于分形维数研究了冲击损伤形貌。研究结果表明损伤分形维数越大的试验件冲击后压缩强度越低,据此提出了一种基于冲击损伤形貌分形维数的复合材料冲击后压缩性能预测模型。该方法将冲击损伤形貌等效成分形几何图形——Sierpinski地毯,通过损伤分形维数获得层合板损伤后不再参与承载的面积,进而获得层合板剩余压缩强度。模型预测结果与试验结果吻合较好,且无须冲击能量作为输入参数,工程应用方便。
The bearing capacity of fiber reinforced plastic(FRP)composite is very sensitive to low-speed impact damage,so the prediction model of compression after impact(CAI)for FRP composite is vital to its engineer-ing application.Therefore,the residual compressive strength tests of three different kinds of carbon fber reinforced plastic(CFRP)/5284RTM/U3160 laminates under BVID state were carried out in this paper.The C-scan was used to obtain the impact damage morphologies of different CFRP laminates before compression test,and the impact damage morphologies were studied by the fractal dimension.The results show that the larger the fractal dimension of impact damage morphology,the lower the compression after impact.Based on this discovery,a prediction method of compressive strength after low-speed impact for fiber reinforced plastic composite based on the fractal dimension of impact damage was proposed.In this method,the impact damage morphology was equivalent to the basic fractal geometry(Sierpinski carpet),the non-bearing area of CFRP laminate could be obtained by the fractal theory.Then the residual compressive strength can be calculated by the normalized non-bearing area.The impact energy was not used as input parameter in this method,and the prediction results of the method were in good agreement with the experimentalresults.Therefore,the CAI prediction method proposed in this paper is convenient for engineering application.
作者
姜文
樊红星
姚卫星
陈方
马铭泽
JIANG Wen;FAN Hongxing;YAO Weixing;CHEN Fang;MA Mingze(Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration,Nanjing Engineering Institute of Aircraft Systems,AVIC,Nanjing 211106,China;The Third Military Representative Office in Nanjing,the Military Representative Bereau of the Air Force Equipment Department in Shanghai,Nanjing 210016,China;Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle,NUAA,Nanjing 210016,China;State Key Laboratory of Mechanics and Control of Mechanical Structures,NUAA,Nanjing 210016,China;Institute of Struetural Strength,Shanghai Aireraft Design and Research Institute,Shanghai 200120,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第3期11-17,26,共8页
Composites Science and Engineering
基金
国家自然科学基金项目(52075244)
国家自然科学基金项目(11202098)。
关键词
树脂基纤维增强复合材料
低速冲击
剩余压缩强度
分形维数
fiber reinforced plastic composite
low-speed impact
residual compressive strength
fractal dimension
