Prediction of low deformation rate creep behavior of polyethylene via molecular dynamics simulation
발표자
지창환 (서강대학교)
연구책임자
성봉준 (서강대학교)
초록
내용
Creep is a method to measure mechanical properties by deforming under constant stress. Creep behavior shows three stages: primary creep, initial extension occurs rapidly; secondary creep, creep strain shows linear response; and tertiary creep, strain increases rapidly after high amount of deformation. Primary and secondary creep can be described by the Burger model which implies that they are related to Young’s modulus and viscosity, respectively. However, analyzing creep via molecular dynamics (MD) simulation is still insufficient because of the rapid deformation rate, which makes it difficult to reproduce real experiments. To overcome these limitations, we employed the Ree-Eyring theory, which describes the relation between strain rate and viscosity. In this work, we present a method for predicting creep properties. Applying this methodology, we predicted viscosity in the experimental regime using MD simulation in good agreement with the experimental range.