Modeling the viscoplastic behavior of a semicrystalline polymer

Cundiff, Kenneth N.; Ayoub, Georges; Benzerga, Amine A.

doi:10.1016/j.ijsolstr.2022.111920

Modeling the viscoplastic behavior of a semicrystalline polymer

Journal Article · Wed Aug 17 00:00:00 EDT 2022 · International Journal of Solids and Structures

DOI:https://doi.org/10.1016/j.ijsolstr.2022.111920· OSTI ID:1887397

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Texas A & M Univ., College Station, TX (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
University of Michigan-Dearborn, MI (United States)
Texas A & M Univ., College Station, TX (United States)

In this study, a complex constitutive relation is identified using inverse modeling with the nominal mechanical response as sole experimental input. The methodology is illustrated for a semicrystalline thermoplastic in the presence of strain localization at finite deformations. The experimental database includes cylindrical tensile bars, compression pins and round notched bars loaded at strain rates spanning up to five decades and temperatures below and above T_g. The data is organized into a calibration set and a validation set. The response of tensile specimens is determined using finite element analyses and a two-phase constitutive relation for semicrystalline polymers that accounts for temperature- and rate-sensitive plastic flow, pressure-sensitivity, small-strain softening and large-strain orientational hardening of the amorphous phase, along with the evolution of crystallinity. The large number of constitutive parameters is identified using an optimization tool coupled with the finite element solver and the calibration set from experiments. The methodology is shown to be successful in predicting the response of round notched bars and replicating the effects of temperature and strain rate on the severity of necking in tensile bars. The proposed model identification strategy is both simple and effective in comparison with other elaborate methods that attempt to access intrinsic behavior directly from high-fidelity experimental measurements.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Qatar National Research Fund (QNRF)

Grant/Contract Number:: NA0003525

OSTI ID:: 1887397

Report Number(s):: SAND2022-11379J; 709312

Journal Information:: International Journal of Solids and Structures, Journal Name: International Journal of Solids and Structures Vol. 254-255; ISSN 0020-7683

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Finite deformation
Finite elements
Inverse methods
Necking
Polymers
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Modeling the viscoplastic behavior of a semicrystalline polymer

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