Experimental study on the cyclic mechanical behavior of polyurethane at different compression strains
In order to obtain the cyclic compression mechanical properties of polyurethane elastomers(PUE),a series of cyclic compression mechanical experiments of PUE under different moderate strains(10.1％,13.5％,17.5％,21.0％,30.0％)were carried out,and the compression stress-strain curves in the range of small to moderate strains were obtained.Based on the experimental results,the hyperelastic response,residual strain,hysteresis loss,and Mullins effect of the materials were discussed.The classical 8-chain model was used to describe the hyperelastic mechanical characteristics of PUE.The linear model was used to describe the viscoelastic mechanical characteristics.And combined with the theory of network alteration,a constitutive model was established which could accurately describe the cyclic loading and unloading mechanical behavior of PUE.The results show that the constitutive model can characterize the experimental results of PUE under different strains and different strain rates,including loading and unloading curves,residual strain,and Mullins effect,etc.It is expected to provide theoretical support for the prediction of mechanical behavior of polyurethane vibration isolators.
polyurethane elastomercyclic compressionMullins effect8-chain model
万方数据
维普
