摘要
通过真空辅助树脂注射技术制备出由亚麻纤维面板和聚氨酯泡沫材料芯组成的夹芯板,分别在25、40、55和70℃下对夹芯板开展水浸泡老化实验,并对老化后的夹芯板进行低速冲击测试。采用正交实验设计,考察了夹芯板在不同温度下的吸湿率和抗冲击能力随时间变化规律。分析了夹芯板的接触力、位移和吸收能量等冲击响应历程,结合夹芯板损伤形态观察,研究了老化后夹芯板的冲击损伤特征。结果表明:随着老化温度的提升和老化时间的延长,夹芯板的吸湿率逐渐增大,抗冲击性能呈阶梯状下降;与25℃老化条件对比,70℃老化30 d的夹芯板受12 J能量冲击时的峰值力下降51.6%,吸收能量下降56.7%。
Sandwich panels,consisting of flax fiber-reinforced polymers panels and polyurethane foam cores,were fabricated by the vacuum-assisted resin injection process.After that,water immersion aging experiments,at four temperatures of 25,40,55,and 70℃,and low-velocity impacts experiment were conducted successively on the sandwich panels.An orthogonal experimental was designed to investigate the effects of hygrothermal aging on moisture absorption rate and the degradation law for impact resistance of sandwich panels at different temperatures.The impact mechanical response history of sandwich panels such as contact force,displacement,and absorbed energy were analyzed,besides,the damage morphology was observed by visual inspection which reveals the impact damage characteristics of sandwich panels after aging.The results revealed that the moisture absorption rate of the sandwich panel gradually increased with the growth of aging temperature and aging time,their impact resistance decreased stepwise.Compared with the aging case at 25℃,the maximum contact force of the sandwich panel aged at 70℃for 30 d decreased by 51.6%and the absorbed energy decreased by 56.7%under the impact energy of 12 J.
作者
刘莹
王沁宇
杨博
郭会丽
崔晓晟
谈建平
LIU Ying;WANG Qinyu;YANG Bo;GUO Huili;CUI Xiaosheng;TAN Jianping(The Boiler&Pressure Vessel Safety Inspection Institute of Henan Province,Luoyang 471000,Henan,China;Fujian Fuqing Nuclear Power Co.,Ltd.,Fuqing 350318,Fujian,China;Shanghai Institute of Special Equipment Supervision and Inspection Technology,Shanghai 200062,China;School of Space and Propulsion,Shanghai 201112,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2022年第4期65-76,共12页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(52075174)。
关键词
亚麻纤维
夹芯板
湿热老化
低速冲击损伤
抗冲击性能
flax fiber
sandwich panel
hygrothermal aging
damage under low-velocity impact
impact resistance
