反复加载下PVC建筑膜材的应力松弛行为

Stress Relaxation Behavior of PVC Architectural Membrane under Repeated Loading

为进一步研究膜材的松弛性能,对PVC膜材的反复应力松弛性能进行了测试,并讨论了初始松弛应力、松弛次数、单次松弛时间对残余应力、反复应力松弛率和反复应力松弛速率的影响。分析结果表明:残余应力随松弛次数和初始松弛应力的增加而增加,随单次松弛时间的增加而降低;反复应力松弛率随初始松弛应力和单次松弛时间的增加而增加,随松弛次数增加而降低;反复应力松弛速率随单次松弛时间和松弛次数的增加而增加,随初始松弛应力的增加而减少。

To further investigate the stress relaxation property of membrane materials,the repeated stress relaxation property of PVC membrane was tested in this study,and the effects of initial relaxation stress,relaxation number and single relaxation time on the residual stress,repeated stress relaxation ratio and repeated stress relaxation rate were also discussed.The analytical results showed that residual stress increased with relaxation number and initial relaxation stress,and decreased with relaxation time.The repeated stress relaxation ratio increased with initial relaxation stress and single relaxation time,and decreased with relaxation number.The repeated stress relaxation rate increased with single relaxation time and relaxation number,and reduced with initial relaxation stress.