非周期性三维五向编织复合材料拉伸失效机理
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摘要
以三维五向结构为研究对象,设计减纱工艺形成非周期性特征,进而制备碳纤维/环氧树脂三维五向编织非周期性结构复合材料。采用万能试验机与高速摄像机相结合的测试方式,获取非周期性结构拉伸力学行为及试验过程;在此基础上,通过高分辨率Micro-CT及SEM对非周期性结构试样破坏形貌进行观测,研究渐进损伤演化及最终失效机理,并与周期性结构的结果进行对比。研究表明:非周期性三维编织复合材料拉伸强度比相同结构参数周期性材料的测试值低16. 84%,损伤源于减纱处,形成了应力集中,最终破坏模式以纤维束抽拔断裂为主。该研究结果可为异型编织复合材料结构设计及强度分析提供依据。
This paper was motivated by designing three-dimensional five-directional structure with the non-periodic characteristics by the process of the yarn reduction. Then carbon/epoxy three-dimensional five-directional braided composites were prepared. The universal material testing machine and the high speed camera were employed to the tensile mechanical behaviors and damage process. Furthermore,the progressive damage and final failure images were observed by using Micro-CT and scanning electron microscope(SEM). The failure mechanism of non-periodic braided composites were analyzed and compared with that of the periodic samples. The results show that the tensile strength of non-periodic3 D braided composites is 16. 84% lower than that of periodic materials with the same structural parameters. The damage of non-periodic three-dimensional braided composite material is derived from the yarn reduction,and the stress concentration is formed,and the ultimate failure mode is based on the fiber bundle pulling fracture. The results of this study can provide a basis for structural design and strength analysis of special-shaped braided composites.
This paper was motivated by designing three-dimensional five-directional structure with the non-periodic characteristics by the process of the yarn reduction. Then carbon/epoxy three-dimensional five-directional braided composites were prepared. The universal material testing machine and the high speed camera were employed to the tensile mechanical behaviors and damage process. Furthermore,the progressive damage and final failure images were observed by using Micro-CT and scanning electron microscope(SEM). The failure mechanism of non-periodic braided composites were analyzed and compared with that of the periodic samples. The results show that the tensile strength of non-periodic3 D braided composites is 16. 84% lower than that of periodic materials with the same structural parameters. The damage of non-periodic three-dimensional braided composite material is derived from the yarn reduction,and the stress concentration is formed,and the ultimate failure mode is based on the fiber bundle pulling fracture. The results of this study can provide a basis for structural design and strength analysis of special-shaped braided composites.
引文
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[21]FANG G,CHEN C,YUAN S,et al. Micro-tomography based geometry modeling of three-dimensional braided composites[J]. Applied Composite Materials,2017(3):1-15.
[2]杜善义.先进复合材料与航空航天[J].复合材料学报,2007,24(1):1-12.
[3] WEHRKAMP-RICHTER T, HINTERH?LZL R,PINHO S T. Damage and failure of triaxial braided composites under multi-axial stress states[J]. Composites Science&Technology,2017,150:32-44.
[4] ZHANG M,ZUO C,SUN B,et al. Thermal ageing degradation mechanisms on compressive behavior of 3-D braided composites in experimental and numerical study[J]. Composite Structures,2016,140:180-191.
[5] BALOKAS G,CZICHON S,ROLFES R. Neural network assisted multiscale analysis for the elastic properties prediction of 3D braided composites under uncertainty[J].Composite Structures,2017,183:550-562.
[6]GE J,HE C,LIANG J,et al. A coupled elastic-plastic damage model for the mechanical behavior of three-dimensional(3D)braided composites[J]. Composites Science&Technology,2018,157:86-98.
[7] MAN Z,ZUO C,SUN B,et al. Thermal ageing degradation mechanisms on compressive behavior of 3-D braided composites in experimental and numerical study[J]. Composite Structures,2016,140:180-191.
[8]孙颖,刘俊岭,郑园园,等.碳/芳纶混编三维编织复合材料拉伸性能[J].纺织学报,2018,39(2):49-54.
[9]ZHOU H,LI C,ZHANG L,et al. Micro-XCT analysis of damage mechanisms in 3D circular braided composite tubes under transverse impact[J]. Composites Science&Technology,2018,155:91-99.
[10] BALOKAS G,CZICHON S,ROLFES R. Neural network assisted multiscale analysis for the elastic properties prediction of 3D braided composites under uncertainty[J].Composite Structures,2017,183:550-562.
[11]傅景韫,李嘉禄,焦亚男.减纱工艺对三维编织矩形截面预制件的细观结构的影响[J].天津工业大学学报,2004,23(6):16-18.
[12]傅景韫.减纱工艺对三维整体编织复合材料细观结构和力学性能的影响[D].天津工业大学,2004.
[13]何红闯,杨连贺,陈利.矩形组合截面四步法二次三维编织及其空间模型可视化[J].复合材料学报,2010,27(4):160-167.
[14]焦亚男,李嘉禄,付景韫.变截面三维编织预制件的增减纱机制[J].纺织学报,2007,28(1):44-47.
[15]程灿灿.变截面三维编织复合材料的减纱工艺及弯曲性能研究[D].东华大学,2012.
[16]刘兆麟,程灿灿,刘丽芳,等.变截面三维编织复合材料减纱工艺与弯曲性能[J].复合材料学报,2011,28(6):118-124.
[17]李嘉禄,陈利,焦亚男.变截面预成型制件的三维编织方法及其制件:CN1651627[P]. 2005-08-10.
[18]董方旭,王从科,赵付宝,等.工业CT检测工艺参数对复合材料检测图像质量的影响[J].无损检测,2017,39(12):15-19.
[19] LI Yuanyuan,SUN Baozhong,GU Bohong. Impact shear damage characterizations of 3D braided composite with Xray micro-computed tomography and numerical methodologies[J]. Composite Structures,2017(176)43-54.
[20]郑园园.碳-芳纶混编三维编织复合材料拉伸性能实验研究[D].天津工业大学,2017.
[21]FANG G,CHEN C,YUAN S,et al. Micro-tomography based geometry modeling of three-dimensional braided composites[J]. Applied Composite Materials,2017(3):1-15.