对制备的8层碳/芳纶试验件分别进行了拉伸和疲劳实验,得到其强度和弹性模量分别为574MPa、47.89Gpa,试验件的疲劳寿命随应力水平系数的增加而减小。通过数字图像相关方法,对拉伸过程中的试验件表面进行拍摄,获取了表面的应变云图,并通过电子显微镜对失效后的试验件断口进行观察。静载拉伸结果表明,试验件会产生脆性断裂,但不会出现分层现象,纤维在交织点处的应变大于其他部位的应变,且随着时间的变化,纤维横、纵交织点处的应变呈周期性变化。疲劳实验结果表明,试验件在断口处存在絮状物,且出现分层现象。
The tensile and fatigue tests were carried out on the 8-layer C/aravid-fiber test piece.The strength and elastic modulus of the 8-layer C/aravid-fiber test piece were 574MPa and 47.89GPa,respectively.The fatigue life of the test piece decreased with the increase of the stress level coefficient.By means of digital image correlation method,the surface of the test piece in the tensile process was photographed,and the strain cloud map of the surface was obtained.The fracture of the test piece after failure was observed by electron microscope.Static load tensile results shown that the brittle fracture can occur,but no delamination occurred.The strain at the interleaving point of the fiber was greater than that at other parts,and the strain at the transverse and longitudinal interleaving points of the fiber changed periodically with the change of time.The results of fatigue test shown that the flocculent and delamination existed in the fracture of the test piece.
[1] 许经纬,顾嫒娟.碳玻混杂纤维增强复合材料的拉-拉疲劳性能的研究[J].复合材料科学与工程,2020(4):39-45.
[2] Rathish R,Aravindkumar N,Abhijith S,et al.Studies on mechanical properties of hybrid fiber reinforced polymer matrix composites[J].IOP Conference Series:Materials Science and Engineering,2021,1145(1):573-577.
[3] Lucas C,Frederik C,Sangeetha R,et al.Sustainable composites:processing of coir fibres and application in hybrid-fibre composites[J].Journal of Composite Materials,2020,54(15):1947-1960.
[4] 孙同生,王琪,于存贵.玻-碳混杂纤维缠绕复合材料发射筒发射动力学研究[J].振动与冲击,2019,38(24):74-80.
[5] 张聪,夏超凡,袁振,等.混杂纤维增强应变硬化水泥基复合材料的拉伸本构关系[J].复合材料学报,2020,37(7):1754-1762.
[6] 孙直,石姗姗,孙士勇,等.芳纶纤维增韧碳纤维-泡沫金属夹芯梁压缩性能及界面性能[J].复合材料学报,2014,31(6):1497-1502.
[7] 王海雷,段跃新,王维维,等.玻璃纤维与碳纤维混杂复合材料的拉伸及低速冲击性能研究[J].复合材料科学与工程,2021(2):102-109.
[8] 陈秋宇,赫玉欣,张丽,等.碳纤维/玻璃纤维混杂复合材料的力学性能研究[J].化工新型材料,2020,48(7):134-138.
[9] Tang S F,Hu C L.Design,preparation and properties of carbon fiber reinforced ultra-high temperature ceramic composites for aerospace applications:a review[J].Journal of Materials Science & Technology,2017,33(2):117-130.
[10] 任明伟,洪治国,周玉敬,等.复合材料防撞梁低速碰撞优化设计[J/OL].复合材料学报:1-8[2021-05-07].https://doi.org/10.13801/j.cnki.fhclxb.20210420.001.
[11] Cho J,Park J.Hybrid fiber-reinforced composite with carbon,glass,basalt,and para-aramid fibers for light use applications[J].Materials Research Express,2021,8(12):1012-1016.
[12] 王伟.三维五向碳/芳纶混杂编织复合材料弯曲性能及其损伤演化有限元分析[D].天津:天津工业大学,2020.
[13] 孙颖,田书全,唐梦云,等.碳-芳纶二维编织复合材料层板的抗低速冲击性能[J].天津工业大学学报,2018,37(3):1-6.
[14] 严文聪,曾金芳,李朝阳,等.芳纶Ⅲ纤维及其混杂碳纤维复合材料的压缩性能研究[J].玻璃钢/复合材料,2016(11):90-93.
[15] 齐业雄,姜亚明,李嘉禄.混杂比对碳/芳纶纤维混杂纬编双轴向多层衬纱织物增强复合材料力学性能的影响[J].材料工程,2020,48(2):71-78.
[16] 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.
[17] 陈庆林.混杂纤维复合材料力学性能与仿真应用研究[D].常州:江苏理工学院,2018.
基金资助
国家科技重大专项项目(2018ZX04026001-008)
PDF
