Study on static and dynamic mechanical properties and constitutive model of PVC/TPU blends
In this study,both universal material testing and high-speed tensile testing machines were used to measure the static and dynamic tensile mechanical properties of the poly(vinyl chloride)(PVC)/thermoplastic polyurethane(TPU)blends by using two molding methods and six blending ratios.The molding methods and blending ratios were optimized according to the fracture elongation and Shore hardness of the blends.The stress-strain data were obtained in a wide strain-rate range of 0.001～700 s-1,and microscopic characterization was carried out up on the cross-section of the ten-sile samples.The results indicated that the molded material obtained higher fracture elongation,and it achieved maxi-mum fracture elongation at a PVC/TPU mass ratio of 90/10.The Shore hardness meets the hardness range of the soft tissue material of the test dummy(Shore 40～70 A).The PVC/TPU(90/10)blends exhibited a significant strain-rate effect under both static and dynamic loads.The Zhu-Wang-Tang′s and Sherwood Frost′s equations were employed to construct a constitutive model for the blends,and a comparative investigation indicated that the Sherwood Frost′s equa-tion had better fitting effect.The topography analysis indicated that under static and dynamic loads,the blends exhibited a typical brittle fracture without significant phase separation.As the strain rate increased,the cross-section became rough gradually and produced voids and small cracks.
poly(vinyl chloride)thermoplastic polyurethanestrain rateconstitutive model
国家科技期刊平台
NSTL
万方数据
维普
