摘要
随着纤维增强复合材料的广泛应用,研究其在湿热环境下的动态力学性能具有重要的理论研究意义与工程应用价值。首先对碳纤维增强环氧树脂基(Carbon/Epoxy)复合材料层合板试件进行了湿热处理,其后采用分离式霍普金森压杆(SHPB)技术开展了干/湿态试件高应变率压缩实验并对实验结果进行分析。结果表明:材料脱(吸)湿过程呈现出两段式特点,存在二次脱(吸)水现象;Carbon/Epoxy复合材料层合板的强度在垂直铺层方向具有显著的应变率敏感性,随着应变率从1 500s-1增加至6 000s-1,其强度增加近3倍,与此同时应变率对其弹性模量的影响却非常微弱;此外,湿热处理有助于提升该材料的动态力学性能,经20d吸湿后材料动态强度有最大12.45%的增幅,吸湿使得材料动态强度的上升在应变率较低时比较明显。
With the extensive application of fiber reinforced composites,the study on its dynamic mechanical properties under hygrothermal environment is provided with theory research significance and practical application value.Fristly,hygrothermal treatment was performed on carbon fiber reinforced epoxy（Carbon/Epoxy）composite laminate specimen.The high strain rate compression experiment of dry/wet state specimen was performed using split hopkinson pressure bar（SHPB）technology.And the experimental results were analyzed.The results indicate that a two stages characteristic is presented in the process of dehydration/rehydration of the material,with an effect of secondary dehydration/rehydration,the strength of Carbon/Epoxy composite laminates have the strain rate sensitivity in the vertical layer direction,the strength increases nearly threefold as the strain rate increase from 1 500s^-1 to6 000s^-1,with an extremely slight change of the elastic modulus.Meanwhile,hygrothermal treatment can improve the dynamic mechanical performance of this kind of material.The material after 20 dmoisture absorption exhibits the highest dynamical strength,up to 12.45% growth,and the rise of dynamical strength of material by moisture absorption is more obvious when the strain rate is relatively low.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2016年第2期259-264,共6页
Acta Materiae Compositae Sinica
作者简介
通讯作者：葛东云，博士，副教授，博士生导师，研究方向为复合材料结构损伤和复合材料结构的气动弹性响应。E—mail：gedy@tsinghua．edu．cn
