摘要
为研究建筑用膜材料在多级循环加载下的力学行为与能量耗散,对聚氯乙烯(PVC)膜材料进行单轴多级循环加载实验测试,分析了变形行为、能量耗散与损伤特性。研究结果表明:相对于单轴拉伸强度,经向试样的循环加卸载峰值强度较低,而纬向试样的循环加卸载强度较高;多级循环加载条件下,加载与卸载弹性模量呈现逐渐增加的变化趋势,且卸载弹性模量高于加载弹性模量;小载荷水平下,相对于经向试样,纬向试样表现出较高的总吸收应变能、弹性应变能和耗散能,但在高载荷水平下较低;在逐级循环加载过程中,PVC膜材料均表现为黏-弹-塑性,基于塑性变形累积来定义损伤变量较为合理。
In order to investigate the mechanical behavior and energy dissipation of architectural membrane under multi\|level loading, the uniaxial multi-level cyclic loading tests were conducted based on the polyvinyl chloride (PVC) membrane, and its deformation behavior, energy dissipation and damage properties were also analyzed. The experimental results show that the peak-strength of warp samples is lower than that of uniaxial tensile strength, and the fill samples is higher that of uniaxial tensile strength under multi-level cyclic loading. Under multi-level cyclic loading, the loading and unloading elastic modulus increase, and the later is higher than former. Compared with warp samples, the fill samples show higher total absorption strain energy, elastic strain energy and dissipated energy at lower loading level, while the indexes are lower at higher loading level. As the PVC membrane is always in viscoelastic plastic stage, it is more reasonable that damage variation is defined based on accumulative plastic deformation, compared with elastic modulus variation and accumulative dissipated energy.
作者
汪泽幸
朱文佳
何斌
刘超
WANG Zexing;ZHU Wenjia;HE Bin;LIU Chao(College of Textile and Fashion, Hunan Institute of Engineering, Xiangtan, Hunan 411104, China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2019年第6期20-26,共7页
Journal of Textile Research
基金
湖南省自然科学基金项目(2016JJ6030)
湖南省科技厅科学研究项目(2013FJ3091)
湖南省教育厅优秀青年项目(16B059)
关键词
聚氯乙烯膜材料
多级循环加载
能量耗散
损伤变量
polyvinyl chloride membrane
multi-level cyclic loading
energy dissipation
damage variable
