Study On Compression And Tensile Mechanical Properties And Constitutive Models Of Polyvinyl Chloride Elastomers At High Strain Rates

Polyvinyl chloride(PVC)is the second-largest general-purpose resin in the world in terms of annual output.Researchers have modified it to obtain elastomer materials with better performance.Polyvinyl chloride elastomer materials are widely used in a variety of complex environments(such as car crashes,aerospace testing,etc.),where they are subject to static and dynamic loads.Studying the compressive and tensile mechanical properties of modified polyvinyl chloride elastomers under quasi-static and dynamic loads,and establishing its superelastic and viscoelastic constitutive models related to strain rate is the key to materials performance evaluation and design development.In this paper,by changing the composition of the material development process to obtain different shore hardness(57A,52 A,47A)polyvinyl chloride elastomer materials and from a micro perspective to analyze the shore hardness change mechanism.In terms of quasi-static mechanical properties,three types of shore hardness polyvinyl chloride elastomer materials were compressed and tensiled at low strain rates using different models of INSTRON material testing machines,the superelastic constitutive models were used to characterize the nonlinear superelastic mechanical properties of three Shore hardness polyvinyl chloride elastomer materials.In terms of dynamic mechanical properties,the conventional SHPB and SHTB experimental devices were improved.The modified SHPB and SHTB experimental devices were used to conduct high strain rates compression and tensile experiments on three shore hardness polyvinyl chloride elastomer materials,the viscoelastic constitutive model was used to characterize the viscoelastic mechanical properties of three shore hardness polyvinyl chloride elastomer materials.The results show that the three shore hardness polyvinyl chloride elastomer materials have quasi-static compressive mechanical properties with significant superelastic characteristics,the feature errors described by the Mooney-Rivlin model and Yeoh model are smaller,while the feature errors described by the Neo-Hookean model are larger.The dynamic compression and tensile mechanical properties have obvious viscoelastic characteristics,and the Zhu-Wang-Tang(ZWT)constitutive model has small error in describing the characteristics.This research can provide theoretical model and method support for the design,development,manufacturing and reliability analysis of soft polymer materials.Figure [39] table [15] reference [59]...