Abstract:

To further investigate the mechanical behavior of membrane materials, short-term tensile creep test on un-notched and single-edge notched specimens were conducted based on a PVC coated membrane material, the influence of notch size and creep stress on tensile creep behavior were analyzed, and tensile creep characteristics were also studied. The experimental results demonstrate that the initial creep and constant creep rate creep stage are also exhibited in un-notched and notched specimens. Under the same net-cross creep stress, notched specimens exhibit lower creep strain than un-notched specimens, and creep strain decreases with the increase of notch size. Compared with Findley model, the 4-element Burger model is more appropriate to describe the short-term tensile creep behavior for the PVC coated membrane material. Meanwhile, the influences of creep stress and notch size on the initial creep strain, delay-elastic deformation and viscous deformation were also discussed, based on the fitted parameters obtained by the 4-element Burger model.

Key words: polyvinyl coated membrane material, woven fabric, creep, single edge notch, Burger model