作者：张琴1,2,3, 王雅娜1,2,3, 刘燕峰1,4,5, 陈新文1,2,3
作者单位：1. 中国航发北京航空材料研究院，北京 100095;
2. 航空材料检测与评价北京市重点实验室，北京 100095;
3. 中国航空发动机集团材料检测与评价航空科技重点实验室，北京 100095;
4. 中国航发北京航空材料研究院软材料技术研究中心，北京 100095;
5. 中国航发北京航空材料研究院先进复合材料国防科技重点实验室，北京 100095
关键词：剪切;应变计;复合材料;模量;ASTM
摘要：
基于标准试验方法ASTM D7078/D7078M-12和ASTM D5379/D5379M-12对2.5D机织碳纤维增强树脂基复合材料V形缺口试样进行剪切试验，重点研究在两种V形缺口剪切试验方法和两种不同规格电阻应变计测试条件下的经、纬向剪切性能，对比试样不同面粘贴的应变计测量的剪切模量的差异，并对试样剪切后的表面损伤进行观察。结果表明：2.5D机织复合材料的V形缺口剪切应力-应变曲线总体呈现非线性特征，±45°方向的正应变曲线对称性良好；采用ASTM D7078/D7078M-12方法更适合2.5D机织复合材料剪切试验；大尺寸应变计测出的剪切模量高于小尺寸应变计；剪切破坏模式主要是表面树脂沿纬纱方向产生裂纹，随后出现纱线屈曲和界面脱粘。
Research on V-notch shear test method of 2.5D woven composite
ZHANG Qin1,2,3, WANG Ya’na1,2,3, LIU Yanfeng1,4,5, CHEN Xinwen1,2,3
1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Key Laboratory of Aeronautical Material Testing and Evaluation, Beijing 100095, China;
3. Key Laboratory of Aeronautical Material Testing and Evaluation, Aero Engine Corporation of China, Beijing 100095, China;
4. Soft Materials Technology Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
5. Key Laboratory of Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
Abstract: Based on the standard test methods ASTM D7078/D7078M-12 and ASTM D5379/D5379M-12, the V-notch specimens of 2.5D woven carbon fiber reinforced composite were subjected to shear test. The focus was on the two types of V-notch shear tests. The warp and weft shear performance under the test conditions of two different specifications of resistance strain gauges were compared. The difference of the shear modulus measured by the strain gauges attached to different sides of thespecimens is compared, and the surface damage of the sample after shearing is observed. The results show that: the V-notch shear stress-strain curve of 2.5D woven composites is generally nonlinear, with normal strain symmetrical in the ±45° direction; the ASTM D7078/D7078M-12 method is more suitable for 2.5D woven composites Shear test; the shear modulus measured by the large-size strain gauge is higher than that of the small-size strain gauge; the shear failure mode is mainly that the surface resin cracks along the weft direction, followed by yarn buckling andinterface debonding.
Keywords: shear;strain gauge;composite;modulus;ASTM
2023, 49(2):174-180 收稿日期: 2021-07-05;收到修改稿日期: 2021-10-23
基金项目: 北京航空材料研究院益材青年基金（KJ53200716）
作者简介: 张琴(1995-),女,四川达州市人,助理工程师,硕士,主要从事复合材料力学测试与性能研究
参考文献
[1] 张子龙. 复合材料面内剪切Iosipescue方法分析及试验研究[J]. 航空材料学报, 1996, 16(1): 55-60
[2] 王言磊, 郝庆多, 欧进萍. 复合材料层合板面内剪切实验方法的评价[J]. 玻璃钢/复合材料, 2007(3): 6-8
[3] 冯景鹏, 余欢, 徐志锋, 等. 2.5D浅交直联Cf/Al复合材料的显微组织及弯曲和剪切性能[J]. 材料工程, 2020, 48(6): 132-139
[4] LIU G, ZHANG L, GUO L, et al. A modified V-notched beam test method forinterlaminar shear behavior of 3D woven composites[J]. Composite Structures, 2017, 181(dec.): 46-57
[5] 张宇. 碳纤维复合材料V型缺口试样剪切试验方案的研究[J]. 材料科学, 2019(1): 1028-1039
[6] 徐琪. 复合材料面内剪切性能测试方法的研究[J]. 玻璃纤维, 2012(3): 6-10
[7] ANTONIOS G S, LUCA G D G, ANTONIOMARIA D I. Assessment of the shear properties of thermoplastic composites using the ±45° tension and the V-notched rail shear methods[J]. Manufacturing Review, 2020, 7(10): 1-11
[8] 孟宪明, 钟正, 程从前, 等. 基于Ls-Dyna软件2种材料模型的碳纤维复合材料层合板面内剪切有限元仿真[J]. 机械工程材料, 2020, 44(12): 85-90
[9] GUDE M, HUFENBACH W, ANDRICH M, et al. Modified V-notched rail shear test fixture for shear characterisation of textile-reinforced composite materials[J]. Polymer Testing, 2015, 43: 147-153
[10] 许艺青, 杨晓翔, 韦铁平. 电阻应变式传感器应变传递影响因素分析[J]. 中国测试, 2018, 44(1): 136-142
[11] 许艺青, 杨晓翔, 韦铁平, 等. 基于正交试验的应变片敏感栅结构参数的优化[J]. 中国测试, 2018, 44(6): 129-133
