复合材料波纹褶皱区域损伤变形测量及声发射监测
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摘要
对含波纹褶皱缺陷的玻璃纤维单向复合材料进行压缩试验,结合声发射(Acoustic Emission,简称"AE")和数字图像相关(Digital Image Correlation,简称"DIC")互补技术,研究复合材料波纹褶皱区域的损伤变形与演化规律。在复合材料试件压缩加载的过程中,采集波纹褶皱区域损伤变形场、应变场信息和实时声发射监测信号,分析复合材料压缩力学响应行为与缺陷区域变形场、应变场以及声发射信号特征之间的对应关系。结果表明:波纹褶皱会严重影响复合材料的力学性能,通过分析声发射信号,发现随着波纹褶皱宽高比减小,复合材料的力学性能呈现降低的趋势;当波纹褶皱宽高比一定时,随着波纹褶皱高度不断增加,复合材料的力学性能呈现降低的趋势。通过DIC测得的应变场与位移场信息,发现对于相同的载荷增量,最大应变呈增加趋势,且波纹褶皱宽高比越大应变增幅越大;越趋近于褶皱中部,水平位移越大,加载方向位移与试件失稳破坏位置有关,接近破坏区域的加载方向位移大。损伤区域位移场和应变场清晰地反映了玻璃纤维复合材料的损伤变形特征。
In the compression tests of glass fiber composite materials which have waves,the damage evolution of glass fiber composites was studied by using the acoustic emission(AE) and digital image correlation(DIC)method.The relationship between compressive mechanical response behavior of composite materials and damage deformation field information or acoustic emission characteristic parameters was analyzed by collecting acoustic emission signals and damage deformation field information during compression test.The results show that waves have serious influence to mechanical property of composite materials.By analyzing acoustic emission signals,it is found that,as waves' ratio of width and height decrease,mechanical property of composite materials becomes worse;and in the same ratio of width and height,as waves' height increase,mechanical property of composite materials is worse.By analyzing strain field and displacement field from DIC,it is found that,in the same load increment,the maximum strain increase and the composite materials which have a wave with higher ratio of width and height have a larger increment of maximum strain.The place which is close to the middle of composite materials has a larger horizontal displacement.However,loading direction displacement is related to creak.The place which is close to creak has a larger loading direction displacement.It reflects clearly damage and deformation characteristic of composite materials by using displacement field and strain field.
In the compression tests of glass fiber composite materials which have waves,the damage evolution of glass fiber composites was studied by using the acoustic emission(AE) and digital image correlation(DIC)method.The relationship between compressive mechanical response behavior of composite materials and damage deformation field information or acoustic emission characteristic parameters was analyzed by collecting acoustic emission signals and damage deformation field information during compression test.The results show that waves have serious influence to mechanical property of composite materials.By analyzing acoustic emission signals,it is found that,as waves' ratio of width and height decrease,mechanical property of composite materials becomes worse;and in the same ratio of width and height,as waves' height increase,mechanical property of composite materials is worse.By analyzing strain field and displacement field from DIC,it is found that,in the same load increment,the maximum strain increase and the composite materials which have a wave with higher ratio of width and height have a larger increment of maximum strain.The place which is close to the middle of composite materials has a larger horizontal displacement.However,loading direction displacement is related to creak.The place which is close to creak has a larger loading direction displacement.It reflects clearly damage and deformation characteristic of composite materials by using displacement field and strain field.
引文
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[15]Wang J,Potter K.D.,Hazra K.,et al.Experimental fabrication and characterization of out-of-plane fiber waviness in continuous fiber-reinforced composites[J].Journal of Composite Materials,2012,46(17):2041-2053.
[16]郝文峰,郭广平,陈新文,等.基于数字图像相关方法的复合材料层间剪切性能研究[J].玻璃钢/复合材料,2016(1):29-32.
[2]吴彦波,刘宏亮.复合材料风电叶片褶皱疲劳性能影响研究[J].天津科技,2015(07):64-65,67.
[3]Fish J,Le Monds J,Shek KL.Modeling of wrinkling in compression molding of composites[J].Journal of Engineering Mechanics,1999,125(8):951-955.
[4]Wang J,Potter KD,Wisnom MR,et al.Failure mechanisms under compression loading in compositeswith designed out-of-plane fibre waviness[J].Plastics,Rubber and Composites,2013,42(6):231-238.
[5]Sutcliffe M.P.F..Modelling the effect of size on compressive strength of fibre composites with random waviness[J].Composites Science and Technology,2013,88:142-150.
[6]Allison B.D.,Evans J.L..Effect of fiber waviness on the bending behavior of S-glass/epoxy composites[J].Materials and Design,2012,36:316-322.
[7]吴维清,祖磊.波纹缺陷对复合材料层合板压缩力学性能影响研究[J].玻璃钢/复合材料,2015(09):87-92,28.
[8]周伟,孙诗茹,冯艳娜,等.风电叶片复合材料拉伸损伤破坏声发射行为[J].复合材料学报,2013,30(2):240-246.
[9]陈维业,胡杰,刘光辉,等.复合材料胶接修补界面损伤演化声发射监测[J].玻璃钢/复合材料,2016(7):9-13.
[10]李亚娟,周伟,刘然,等.复合材料Ⅱ型分层损伤演化声发射监测[J].玻璃钢/复合材料,2015(1):54-58.
[11]吴维清,朱俊,王继辉,等.纤维波纹对复合材料层合板刚度影响研究[J].玻璃钢/复合材料,2015(12):41-47.
[12]欧阳佳斯,倪爱清,朱俊,等.均一波纹单向复合材料板的力学性能研究[J].玻璃钢/复合材料,2016(03):38-43.
[13]Diao,Hele,Robinson,et al.Unidirectional carbon fibre reinforced polyamide-12 composites with enhanced strain to tensile failure by introducing fibre waviness[J].Composites Part A,2016,87:186-193.
[14]Mizukami,Koichi,Mizutani,et al.Detection of in-plane and outof-plane fiber waviness in unidirectional carbon fiber reinforced composites using eddy current testing[J].Composites Part B,2016,86:84-94.
[15]Wang J,Potter K.D.,Hazra K.,et al.Experimental fabrication and characterization of out-of-plane fiber waviness in continuous fiber-reinforced composites[J].Journal of Composite Materials,2012,46(17):2041-2053.
[16]郝文峰,郭广平,陈新文,等.基于数字图像相关方法的复合材料层间剪切性能研究[J].玻璃钢/复合材料,2016(1):29-32.