Effects of surface topography and specimen thickness on high-speed raindrop impact damage of CFRP laminates

作     者：Naidan HOU Renxi ZHAO Xuan WANG Zhongbin TANG Hao CUI Yulong LI Naidan HOU;Renxi ZHAO;Xuan WANG;Zhongbin TANG;Hao CUI;Yulong LI

作者机构：School of AeronauticsNorthwestern Polytechnical UniversityXi'an 710072China Joint International Research Laboratory of Impact Dynamics and Engineering ApplicationXi'an 710072China Shaanxi Key Laboratory of Impact Dynamics and Engineering ApplicationXi'an 710072China School of Civil AviationNorthwestern Polytechnical UniversitySuzhou 215400China NPU Yangzi River Delta Research InstituteSuzhou 215400China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2023年第36卷第6期

页      面：186-200页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0825[工学-航空宇航科学与技术] 

基　　金：supported by the National Natural Science Foundation of China(Nos.11832015 12072289 and 12172304) 

主　　题：Carbon fiber reinforced plastics Failure analysis Impact testing Lateral jetting Surface roughness Waterjet 

摘      要：Raindrop impact erosion has been observed since early days of aviation,and can be catastrophic for exposed materials during supersonic flight.A single impact waterjet apparatus is established for mimicking drop impacts at the velocities between 350 m/s and 620 m/*** Fiber Reinforced Polymer(CFRP)laminates with three different surface morphologies and specimen thicknesses are tested here.A central region with no visible damage has been noticed,surrounded by afailure ringwith common damage patterns including resin removal,matrix cracking,fiber breakage and mass fiber *** features are presented in thefailure ringwhose whole scope extends larger along the longitudinal direction than the transverse direction of the top *** mechanism of the resin removal is related to fiber-matrix debonding,and its onset and propagation can be facilitated by initial surface asperities with the shear action of the lateral *** cases of multiple impact,good surface quality can slow down the evolution of resin removal and fiber exposure on the CFRP surface,reducing the erosion speed and delaying the occurrence of structural damages in the subsequent *** wave dominates the occurrence of matrix cracking on the CFRP surface,and subsequently,results in material loss and peeling of the top-layer because of lateral *** the increase of the specimen thickness,both the interlaminar and intralaminar failures decrease as the impact damage mechanism changes from plate bending stress to the reflection of stress waves.