Cao Hongyi, Ma Mengyuan, Jiang Mingshun, Sun Lin, Zhang Lei, Jia Lei, Tian Aiqin, Liang Jianying
School of Control Science and Engineering, Shandong University, Jinan 250061, China.
Zhongche Qingdao Sifang Locomotive and Rolling Stock Co., Ltd., Qingdao 266111, China.
Materials (Basel). 2020 Sep 17;13(18):4131. doi: 10.3390/ma13184131.
The present study delved into the effect of impactor diameter on low velocity impact response and damage characteristics of CFRP. Moreover, the phased array ultrasonic technique (PAUT) was adopted to identify the impact damages based on double-sided scanning. Low-velocity impact tests were carried out using three hemispherical impactors with different diameters. The relationship of impact response and impactor diameters was analyzed by ultrasonic C-scans and S-scans, combined with impact response parameters. Subsequently, the damage characteristics were assessed in terms of dent depth, delamination area and extension shape via the thickness, and the relationships between absorbed energy, impactor displacement, dent depth and delamination area were elucidated. As revealed from experiment results, double-sided PAUT is capable of representing the internal damage characteristics more accurately. Moreover, the impactor diameter slightly affects the impact response under small impact energy, whereas it significantly affects the impact response under large impact energy.
本研究深入探讨了冲击器直径对碳纤维增强塑料（CFRP）低速冲击响应及损伤特性的影响。此外，采用相控阵超声技术（PAUT）通过双面扫描来识别冲击损伤。使用三种不同直径的半球形冲击器进行了低速冲击试验。通过超声C扫描和S扫描，并结合冲击响应参数，分析了冲击响应与冲击器直径之间的关系。随后，通过厚度评估了凹痕深度、分层面积和扩展形状等损伤特性，并阐明了吸收能量、冲击器位移、凹痕深度和分层面积之间的关系。实验结果表明，双面PAUT能够更准确地呈现内部损伤特性。此外，在小冲击能量下，冲击器直径对冲击响应的影响较小，而在大冲击能量下，它对冲击响应有显著影响。
