Tensile Mechanical Behavior of Ionomer Interlayer Considering Effects of Temperature and Loading Style

Abstract:

In order to evaluate the tensile mechanical behaviour of ionomer interlayer considering temperature effect and loading effect， monotonic tests at -40 °C ~ 80 °C， as well as cyclic loading-unloading tests at room temperature were conducted on ionomer interlayer specimens at low strain rates. Characteristic mechanical properties are extracted from the test results. As the strain rate increases and the temperature decreases， the material's strength increases but its ultimate strain decreases. The fractured specimen exhibits around 80% plastic deformation. The envelope of the cyclic loading and unloading curve is consistent with that of the monotonic curve. As the unloading strain increases， the hysteretic energy dissipation of the ionomer interlayer increases， while the secant unloading modulus decreases firstly and then increases. Based on the G'Sell model， a constitutive equation for low strain rates is proposed. Furthermore， a variable modulus model is proposed for the prediction of the material's loading-unloading behaviour and verified against the experimental results.

Key words:ionomer interlayer;monotonic and cyclic loading-unloading tensile tests;strain rate effect;temperature effect;constitutive model;variable modulus model