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- W3024059601 abstract "In this study, a multiscale approach was constructed for the multi-axial plastic deformations of epoxy polymers to develop a macroscopic constitutive model at a quasi-static strain rate (consistent with laboratory tests) without any experiments. The 3-dimensional constitutive model was fully characterized, considering the effects of strain rate, temperature, hydrostatic pressure, and crosslinking density. The quasi-static yield stress was predicted by conducting molecular dynamics simulations based on the Argon theory and internal stress law established by thermomechanical properties. For the proper description of nonlinear dependences of the obtained yield stresses on the strain rate and temperature, which have not been considered in previous studies, a cooperative model was adopted as a link between the simulations and experiments. Taking into account characteristic quasi-static yield behavior, one-dimensional quasi-static constitutive equations were derived by developing hardening laws considering strain rate dependences of the yield strain and yield stress established at the quasi-static level. Finite element analysis was then performed on these equations considering the influence of temperature, hydrostatic pressure, and crosslinking density by implementing a continuum model based on the paraboloidal yield function. Finite element simulations included a 1-element patch test conducted for one-dimensional loading paths and open-hole test performed for both the validation and practical use of the model describing the structural behavior of the studied polymer under combined loading. The results of open-hole simulations revealed that the proposed multiscale framework successfully considered the microscopic structural characteristics of amorphous polymers in establishing elasto-plastic finite element models." @default.
- W3024059601 created "2020-05-21" @default.
- W3024059601 creator A5008311630 @default.
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- W3024059601 date "2020-09-01" @default.
- W3024059601 modified "2023-09-30" @default.
- W3024059601 title "A multiscale framework for the elasto-plastic constitutive equations of crosslinked epoxy polymers considering the effects of temperature, strain rate, hydrostatic pressure, and crosslinking density" @default.
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- W3024059601 doi "https://doi.org/10.1016/j.jmps.2020.103962" @default.
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