Ductile–brittle failure of amorphous glassy polymers: A phase-field approach

Date

2022-11-01

Author

Dal, Hüsnü
Gültekin, Osman
BAŞDEMİR, SELÇUK
Açan, Alp Kağan

Metadata

Show full item record

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

Item Usage Stats

84
views

0
downloads

© 2022 Elsevier B.V.Optimal use and design of amorphous glassy polymers in goods have become a significant task in the key industrial sectors ranging from micro-electronics to aerospace and medical industry. Depending on the microstructure, temperature level and the external loading rate to which these polymers are subjected, the fracture response may change from ductile to brittle or vice versa. While the ductile response is manifested by diffuse shear zones exhibiting volume-preserving inelastic deformations, the brittle response is revealed by very small crack-like defects containing a sequence of fibrillar bridges and elongated micro-voids, thereby resembling the void formation consisting of nucleation and growth stages. Their formation is driven by tensile straining followed by volumetric inelastic deformations. The present study is concerned with the description of shear yielding and crazing in terms of their respective evolution equations. Besides, an extension towards the modeling of the fracture is employed via the crack phase-field approach, accounting for ductile and brittle failure concomitantly. This is granted by the novel failure criterion that features a critical amount of plastic strain and void volume fraction. Such a modality simultaneously models the macroscopic crack initiation and growth leading to ductile or brittle fracture, as such purports to be more physically grounded compared to extant models in the literature. The predictive performance of the proposed model has been demonstrated by fitting of various extant experimental data of homogeneous and inhomogeneous tests in relation to initial boundary value problems.

Subject Keywords

Amorphous glassy polymers, Crack phase-field, Crazing, Finite viscoplasticity, Gradient damage, Void growth

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85139859016&origin=inward
https://hdl.handle.net/11511/100680

Journal

Computer Methods in Applied Mechanics and Engineering

DOI

https://doi.org/10.1016/j.cma.2022.115639

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Thermal effects of gate connected field-plates and surface passivation on AlGaN/GaN HEMTs Kara, Doğacan; Okutucu Özyurt, Hanife Tuba; Dönmezer, Nazlı; Department of Mechanical Engineering (2018) AlGaN/GaN high electron mobility transistors (HEMTs) are widely preferred in automotive, space, and military applications due to their superior electrical and thermal properties. However, when operated in full capacity, their electrical reliability drops significantly due to electron collapse, device degradation, concentrated heating, and mechanical stresses. To increase the reliability and maximum performance of GaN HEMTs, field-plate and surface passivation technologies are used frequently. Although signi...
Microwave sintering and characterization of soft magnetic powder metallurgical Ni-Fe alloys Erdem, Derya; Dericioğlu, Arcan Fehmi; Department of Metallurgical and Materials Engineering (2011) In this study, prealloyed austenitic stainless steel and premixed soft magnetic Ni-Fe permalloy compacts were consolidated through microwave and conventional sintering routes at combinations of various sintering temperatures and compaction pressures. Sintered alloys were characterized in terms of their densification, microstructural evolution as well as mechanical and magnetic properties. The effect of sintering method in terms of the applied sintering parameters on the final properties of the compacts were...
Polystyrene-based and carbon fabrİc-reİnforced polymer composİtes containing carbon nanotubes: preparation,modification and characterization Erkmen, Berrak; Bayram, Göknur; Department of Chemical Engineering (2020-11-23) Carbon Fabric-Reinforced Polymers (CFRPs) attract attention due to their high mechanical properties, electrical conductivity, and providing weight reduction solutions in aerospace, automotive, marine, and energy industries. Since recycling, long processing times, non-visible damages, and complex repair procedures of thermoset-based CFRPs cause problems, studies are performed on the application of thermoplastic-based CFRPs. This study aims to produce polystyrene (PS)-based and carbon nanotubes (CNTs) and car...
Cost efficiency analyses of steel frameworks for economical design of multi-storey buildings Hasançebi, Oğuzhan (2017-01-01) In the present study cost efficiencies of various steel frameworks are investigated for economical design of multistorey buildings. A total of thirteen steel frames that incorporate various types of beam-column connection and bracing configuration are considered for detailed and comparative cost analyses. The three multi-storey buildings consisting of 10, 20 and 30 floors are stiffened according to each of the thirteen steel frameworks to yield thirty-nine test frames for numerical applications. First desig...
Microstructural and dielectric properties of naphthalene based polyamide/β-Ni(OH)2 nanocomposites Sezer, Selda; Öz, Erdinc; ALTIN, SERDAR; Vural, Sema; GÜLTEK, AHMET; KÖYTEPE, SÜLEYMAN; Nilüfer Kıvılcım, F. (2018-01-01) Background: Aromatic polyamides are important materials having outstanding thermal, electronic and mechanical properties among high performance polymers and industrial plastics. In addition, aromatic polyamides can be utilized in electronic devices with their low dielectric constant which indicates the storage capacity of these devices. Objective: Free volume is very important for dielectric materials and increase in free volume of a polymer reduces its dielectric constant. The aims of the current study are...

Citation Formats

H. Dal, O. Gültekin, S. BAŞDEMİR, and A. K. Açan, “Ductile–brittle failure of amorphous glassy polymers: A phase-field approach,” Computer Methods in Applied Mechanics and Engineering, vol. 401, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85139859016&origin=inward.