Lin Zikai, Shi Changheng, Huang Xiaochu, Tang Can, Yuan Ye
Shenzhong Link Management Center, Zhongshan 528400, China.
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China.
Polymers (Basel). 2023 Nov 3;15(21):4319. doi: 10.3390/polym15214319.
In addition to measuring the strain, stress, and Young's modulus of materials through tension and compression, in-plane shear modulus measurement is also an important part of parameter testing of composites. Tensile testing of ±45° composite laminates is an economical and effective method for measuring in-plane shear strength. In this paper, the in-plane shear modulus of T800 carbon fiber/epoxy composites were measured through tensile tests of ±45° composite laminates, and acoustic emission (AE) was used to characterize the damage of laminates under in-plane shear loading. Factor analysis (FA) on acoustic emission parameters was performed and the reconstructed factor scores were clustered to obtain three damage patterns. Finally, the development and evolution of the three damage patterns were characterized based on the cumulative hits of acoustic emission. The maximum bearing capacity of the laminated plate is about 17.54 kN, and the average in-plane shear modulus is 5.42 GPa. The damage modes of laminates under in-plane shear behavior were divided into three types: matrix cracking, delamination and fiber/matrix interface debonding, and fiber fracture. The characteristic parameter analysis of AE showed that the damage energy under in-plane shear is relatively low, mostly below 2000 mV × ms, and the frequency is dispersed between 150-350 kHz.
除了通过拉伸和压缩来测量材料的应变、应力和杨氏模量外，面内剪切模量测量也是复合材料参数测试的重要组成部分。±45°复合层压板的拉伸试验是测量面内剪切强度的一种经济有效的方法。本文通过±45°复合层压板的拉伸试验测量了T800碳纤维/环氧树脂复合材料的面内剪切模量，并利用声发射（AE）来表征层压板在面内剪切载荷作用下的损伤。对声发射参数进行因子分析（FA），并对重构因子得分进行聚类以获得三种损伤模式。最后，基于声发射的累计计数来表征这三种损伤模式的发展和演变。层压板的最大承载能力约为17.54 kN，平均面内剪切模量为5.42 GPa。层压板在面内剪切行为下的损伤模式分为三种类型：基体开裂、分层以及纤维/基体界面脱粘和纤维断裂。声发射的特征参数分析表明，面内剪切下的损伤能量相对较低，大多低于2000 mV×ms，频率分散在150 - 350 kHz之间。
