Study on Design of PU Foam Synthetic Sleepers Material Based on Digimat Software
Taking polyurethane foam synthetic sleeper as the research object,the mathematical model of polyurethane foam matrix material was built through experimental data.Based on Mori-Tanka method,the matrix,reinforced phase and final part performance were built with the help of multi-scale nonlinear composite software Digimat.The material constitutive model was continuously revised through the reverse regression iteration method.The predicted results of the modified constitutive model were similar to the measured value,with a maximum deviation of 3.76%.Follows,based on the revised material constitutive model,the effects of the overall density and glass fiber content of the product on the longitudinal and transverse strength of the product were studied respectively.The results showed that,for every increase of 0.1 g/cm3 of the overall density of the product,the longitudinal tensile strength tensile and modulus were increased by about 15%,while the transverse tensile strength and tensile modulus were increased by about 27%.Increasing the content of glass fiber could significantly improve the longitudinal strength and modulus of the product,but the transverse strength and modulus would be reduced.
polyurethane foamsynthetic sleeperMori-Tanka methodDigimatmaterial constitutive model
万方数据
维普
