Computational modeling of rupture in rubbery polymers

Download

index.pdf

Date

2020

Author

Akçören, Berkay

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

222
views

84
downloads

Rubbery polymers, also known as elastomers, can exhibit large deformations that are generally accompanied by inelastic deformations. Owing to their superior mechanical, physical, and chemical properties, elastomers are widely used in a broad range of industrial applications such as car tires, seismic isolators, mechanical membranes, and seals. For these applications, failure prediction is cardinally essential. Therefore, this thesis is concerned with the computational failure analysis of rubbery polymers that exhibit highly non-linear material behavior at large deformations. To this end, we model the rupture of rubbery polymers by using the Phase-Field method, where the conservation equation of linear momentum and the evolution equation for the crack phase-field are solved together. While the former describes the mechanical equilibrium, the latter governs damage evolution in rubber. The material behavior of rubbery polymers undergoing damage is modeled by two distinct approaches taken from literature where the damage-induced degradation in the material affects either the entropic and volumetric part of the energy or the energetic and volumetric part of the energy. Moreover, for the entropic elasticity, distinct constitutive approaches are considered. The different modeling approaches are compared through numerical analyses of benchmark problems involving highly heterogeneous deformations of rubbery polymers undergoing rupture.

Subject Keywords

Fracture., Phase-field method, Fracture, Rubbery polymers

URI

http://etd.lib.metu.edu.tr/upload/12625188/index.pdf
https://hdl.handle.net/11511/45553

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Modeling of spherulite microstructures in semicrystalline polymers Oktay, H. Emre; Gürses, Ercan (2015-11-01) Semicrystalline polymers are composed of crystalline structures together with amorphous polymer chain networks and therefore they exhibit deformation mechanisms of both crystalline materials and amorphous polymers. One of the most common microstructures observed in semicrystalline polymers is the spherulite microstructure in which crystalline lamellae are embedded in a matrix of amorphous material and grow out from a common central nucleus in radial directions. The mechanical behavior of semicrystalline pol...
Studies on visual detection and surface modification testing of glass microfiber filter paper based biosensor Adiguzel, Yekbun; Külah, Haluk (Elsevier BV, 2014-04-15) Glass microfibers are commonly used as biomolecule adsorption media, as structural or disposable components of the optical biosensors. While any improvement in these components are appreciated, utilizing basic tools of traditional approaches may lead to original sensor opportunities as simple, functional designs that can be easily disseminated. Following this pursuit, surface modification of glass microfiber paper surface was performed by 3-aminopropyltriethoxysilane (APTES) and resulting improvement in the...
Modelling of Diffusion in Random Packings of Core-Shell Particles Hatipoğlu, Emre; Koku, Harun (Hacettepe University, 2017-04-01) Core-Shell particles are commonly used materials in chromatography. In this study, a mathematical model that mimics diffusion around Core-Shell particles was developed. A random-walk based algorithm was implemented to simulate diffusion and a Core-Shell particle geometry was computationally formed, based on simple geometric constructs and relations. Diffusion simulations were carried out on a randomly packed geometry formed from these particles. The behavior of time-dependent diffusivity data obtained from ...
Simulation of crystallization and glass formation processes for binary Pd-Ag metal alloys Kart, HH; Uludogan, M; Cagin, T; Tomak, Mehmet (2003-09-12) Glass formation and crystallization process of Pd-Ag metallic alloys are investigated by means of molecular dynamics simulation. This simulation uses the quantum Sutton-Chen (Q-SC) potential to study structural and transport properties of Pd-Ag alloys. Cooling rates and concentration effects on the glass formation and crystallization of binary alloys considered in this work are investigated. Pd-Ag alloys show the glass structure at fast cooling rates while it crystallizes at slow cooling rates. Increment of...
Modeling and simulation of viscous electro-active polymers Vogel, Franziska; Göktepe, Serdar; Steinmann, Paul; Kuhl, Ellen (2014-11-01) Electro-active materials are capable of undergoing large deformation when stimulated by an electric field. They can be divided into electronic and ionic electro-active polymers (EAPs) depending on their actuation mechanism based on their composition. We consider electronic EAPs, for which attractive Coulomb forces or local re-orientation of polar groups cause a bulk deformation. Many of these materials exhibit pronounced visco-elastic behavior. Here we show the development and implementation (o)f a constitu...

Citation Formats

B. Akçören, “Computational modeling of rupture in rubbery polymers,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2020.