超薄单层碳纤维增强复合材料板拉伸和压缩失效行为研究  

Study on tensile and compression failure behavior of ultra-thin-ply carbon fiber reinforced composite panel

作　　者：刘雁鹏 韩宇泽 任中杰 任明法 LIU Yanpeng;HAN Yuze;REN Zhongjie;REN Mingfa(Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,China;School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学工程力学系,大连116024 [2]大连理工大学机械工程学院,大连116024

出　　处：《复合材料科学与工程》2024年第12期19-25,共7页Composites Science and Engineering

基　　金：国家自然科学基金(12272078)。

摘　　要：碳纤维增强复合材料薄层化使其力学性能及设计空间得到了进一步的提升。为了探究超薄单层碳纤维增强复合材料的基础力学性能及失效机理,制备了单层层厚为24μm、55μm、75μm和100μm的复合材料单向板,进行了纵向拉伸、横向拉伸、纵向压缩和横向压缩试验,分析了单层层厚对碳纤维增强复合材料模量、强度的影响,揭示了不同单层层厚碳纤维增强复合材料单向板的失效模式及机理。结果表明:单层层厚对碳纤维增强复合材料在纵向拉伸强度、横向拉伸强度、纵向压缩模量和横向压缩模量的影响并不是单调的,恰当的单层层厚可以使复合材料发挥出最佳的力学性能。此外,单层层厚对碳纤维增强复合材料单向板的失效模式有明显的影响,主要表现在横向劈裂程度、纤维断裂程度、单向板分层程度以及裂纹萌生扩展模式。The thinning of carbon fiber reinforced composites has further improved their mechanical properties and design space.In order to investigate the basic mechanical properties and failure mechanism of ultra-thin-ply carbon fiber reinforced composites,unidirectional composites with four ply thicknesses of 24μm,55μm,75μm and 100μm were prepared and subjected to longitudinal tensile,transverse tensile,longitudinal compressive,and transverse compressive experiments.Analysis was conducted on the influence of ply thickness on the modulus and strength of carbon fiber reinforced composites,revealing the failure modes and mechanisms of unidirectional carbon fiber reinforced composites with different ply thicknesses.The results indicate that the influence of ply thickness on the longitudinal tensile strength,transverse tensile strength,longitudinal compressive modulus and transverse compressive modulus of carbon fiber reinforced composites is not monotonic.Proper ply thickness can enable the composite to exhibit the best mechanical properties.Furthermore,the thickness of the ply also has a significant impact on the failure mode of the unidirectional carbon fiber reinforced composites,mainly manifested in the degree of transverse splitting,fiber fracture,delamination,and crack initiation and propagation mode.

关 键 词：超薄单层碳纤维增强复合材料 单层层厚 单向板 失效行为 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]