Song, Hosup Medvedev, Grigori A. Caruthers, James M. Jo, Jun Young Kim, Jaewoo 2024-01-12T02:32:29Z 2024-01-12T02:32:29Z 2023-01-22 2023-02 0032-3861 https://pubs.kist.re.kr/handle/201004/75814 Historically the constitutive models for glassy polymers have targeted the stress-strain behavior observed in a single-step experiment ？ the constant strain rate (CSR) loading. However, a true test of a constitutive model is the ability to predict the complex multistep deformations. When the CSR loading is the last step of a multistep experiment, the magnitude of the stress overshoot depends on the previous steps, thereby providing a sensitive criterion for testing models. A comprehensive set of multistep experiments has been performed on PBMA/MMA copolymer lightly crosslinked with EGDMA for several temperatures below Tg, where the parameters of the intermediate steps have been systematically varied. None of the traditional constitutive models can even qualitatively predict the data. A recently proposed toy model captures the experimentally observed trends. English Elsevier BV Complex deformation histories and modeling mechanical behavior of glassy polymers Article 10.1016/j.polymer.2023.125707 1 Polymer, v.268 Polymer 268 N scie scopus 000923964700001 Polymer Science Polymer Science Article INELASTIC DEFORMATION CONSTITUTIVE MODEL STRAIN NECKING YIELD