Guo Shanshan, Wang Linlin, Shao Guangwei, Shao Huiqi, Jiang Jinhua, Chen Nanliang
Shanghai Collaborative Innovation Center of High Performance Fibers and Composites, College of Textiles, Donghua University, Shanghai 201620, China.
Engineering Research Center of Technical Textiles, Ministry of Education, Donghua University, Shanghai 201620, China.
Polymers (Basel). 2022 Apr 20;14(9):1666. doi: 10.3390/polym14091666.
In order to study the mechanical behavior and energy dissipation of architectural membrane materials under multistage cyclic loading, the deformation behavior, energy dissipation, and damage characteristics of four kinds of warp-knitted and woven polyvinyl chloride (PVC) membrane materials were analyzed using multistage cyclic loading experiments. The results show that, compared with the uniaxial tensile strength, the peak values of the cyclic loading and unloading of the four material samples are lower in the warp direction but higher in the fill (weft) direction. Under multistage cyclic loading, the loading and unloading moduli of the warp knitting membrane increase with the increase in fabric density. At the same fabric density, the loading modulus and the unloading modulus are smaller than those of the warp knitting material. The total absorbed strain energy, elastic strain energy, and dissipation energy of the fill samples are higher than those of the warp samples at a low load level but lower than those at a high load level. PVC membrane materials' use strength should be controlled below a 15% stress level under long-term external force loading. In the cyclic loading process, the four PVC membrane materials are viscoelastic-plastic, so it is reasonable to define the damage variable based on the accumulation of plastic deformation.
为了研究建筑膜材料在多级循环加载下的力学行为和能量耗散，采用多级循环加载试验分析了四种经编和机织聚氯乙烯（PVC）膜材料的变形行为、能量耗散和损伤特性。结果表明，与单轴拉伸强度相比，四种材料试样循环加卸载的峰值在经向较低，在纬向较高。在多级循环加载下，经编膜的加卸载模量随织物密度的增加而增大。在相同织物密度下，机织材料的加载模量和卸载模量均小于经编材料。在低荷载水平下，纬向试样的总吸收应变能、弹性应变能和耗散能高于经向试样，但在高荷载水平下则低于经向试样。在长期外力作用下，PVC膜材料的使用强度应控制在应力水平的15%以下。在循环加载过程中，四种PVC膜材料均表现为粘弹塑性，因此基于塑性变形的累积来定义损伤变量是合理的。
