A theory of necking in semi-crystalline polymers
A. I. Leonov
Abstract
Necking or cold drawing is a smoothed jump in cross-sectional area of long and thin bars (filaments orfilms) propagating with a constant speed. The necks in polymers, first observed about seventy years ago, arenow commonly used in modern processing of polymer films and fibers. Yet till recently there was a lack infundamental understanding of necking mechanism(s). For semi-crystalline polymers with co-existingamorphous and crystalline phases, recent experiments revealed that such a mechanism is related tounfolding crystalline blocks. Using this idea, this paper develops a theoretical model and includes it in ageneral continuum framework. Additionally, the paper explains the forced (reversible) elasticity observedin slowly propagating polymeric necks, and also briefly analyses the viscoelastic effects and dissipative heatgeneration when polymer necks propagate fast enough.
Create a lesson
Related papers
Access Rate-Dependent Endurance Behavior of Ferroelectric Hafnium Zirconium Oxide Capacitors
Roberto Guido, Julie Laguerre, Pramoda Vishnumurthy et al.
Identification of carbon-related color centers in hBN by high-resolution ab initio photoluminescence modeling
Vytautas Žalandauskas, Marek Maciaszek, Marianne Etzelmüller Bathen et al.
Sorption Molecular Dynamics of Point Defects in 2D Materials with a Machine Learning Potential
Nils-Ruben Skogemyr, Albin Sjöstedt, Isak Wernroth et al.
Transverse magneto-gyrotropy driven by spin-induced ferroaxiality
Yoshihiro Okamura, Takumi Kagawa, Ayano Nakamura et al.
A practical route to amorphous solid-state electrolyte structures by hybrid reverse Monte Carlo with foundation potentials
Xintian Wang, Xinyu Zhang, Denys Butenko et al.
Nonadiabatic polaron dynamics from machine-learned hopping trajectories
Daniela Mangano, Luca Leoni, Zhongfei Xu et al.