Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing

Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing

An experimental investigation is performed to investigate the effect of post-processing heat treatment on the interfacial fracture toughness of bi-material additively manufactured semi-crystalline polymer composite. An asymmetric double cantilever beam (ADCB) and single-leg bending (SLB) specimens m...

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Autores principales: Md Fazlay Rabbi, Vijaya Chalivendra
Formato: article
Lenguaje:EN
Publicado: Elsevier 2021
Materias:
Multi-material additive manufacturing
Semi-crystalline polymers
Annealing
Molecular diffusion
Interfacial fracture
Mechanics of engineering. Applied mechanics
TA349-359
Technology
T
Acceso en línea:https://doaj.org/article/2ebd48fadc0a43289dc8ab6bac3d955f
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spelling oai:doaj.org-article:2ebd48fadc0a43289dc8ab6bac3d955f2021-12-04T04:36:01ZImprovement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing2666-359710.1016/j.finmec.2021.100051https://doaj.org/article/2ebd48fadc0a43289dc8ab6bac3d955f2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666359721000421https://doaj.org/toc/2666-3597An experimental investigation is performed to investigate the effect of post-processing heat treatment on the interfacial fracture toughness of bi-material additively manufactured semi-crystalline polymer composite. An asymmetric double cantilever beam (ADCB) and single-leg bending (SLB) specimens made of polylactic acid (PLA) and Nylon are considered for the mode-I and mixed-mode fracture characterization, respectively. Specimens are isothermally heated in a forced convection oven for a wide range of temperatures and durations. Fracture toughness decreases significantly for both mode-I and mixed-mode conditions when specimens are annealed below the melting temperature of PLA (150 °C). An increase of the crystallinity at the high-temperature annealing prevents the polymer chain mobility, hinders the neck growth, and provides poor intermolecular diffusion resulting in decrease of fracture toughness by 88% as compared to the unannealed specimen. Annealing at 160 °C improves the bi-material interfacial fracture toughness by a maximum of 1225% via sufficient interfacial wetting, higher molecular diffusion, and a longer polymer chain entanglement process. Material transfer, void collapse, and filament impression on the fracture surface of high temperature annealed specimen indicate a better molecular diffusion and strong interlaminar bond at the interface.Md Fazlay RabbiVijaya ChalivendraElsevierarticleMulti-material additive manufacturingSemi-crystalline polymersAnnealingMolecular diffusionInterfacial fractureMechanics of engineering. Applied mechanicsTA349-359TechnologyTENForces in Mechanics, Vol 5, Iss , Pp 100051- (2021)
institution DOAJ
collection DOAJ
language EN
topic Multi-material additive manufacturing
Semi-crystalline polymers
Annealing
Molecular diffusion
Interfacial fracture
Mechanics of engineering. Applied mechanics
TA349-359
Technology
T
spellingShingle Multi-material additive manufacturing
Semi-crystalline polymers
Annealing
Molecular diffusion
Interfacial fracture
Mechanics of engineering. Applied mechanics
TA349-359
Technology
T
Md Fazlay Rabbi
Vijaya Chalivendra
Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
description An experimental investigation is performed to investigate the effect of post-processing heat treatment on the interfacial fracture toughness of bi-material additively manufactured semi-crystalline polymer composite. An asymmetric double cantilever beam (ADCB) and single-leg bending (SLB) specimens made of polylactic acid (PLA) and Nylon are considered for the mode-I and mixed-mode fracture characterization, respectively. Specimens are isothermally heated in a forced convection oven for a wide range of temperatures and durations. Fracture toughness decreases significantly for both mode-I and mixed-mode conditions when specimens are annealed below the melting temperature of PLA (150 °C). An increase of the crystallinity at the high-temperature annealing prevents the polymer chain mobility, hinders the neck growth, and provides poor intermolecular diffusion resulting in decrease of fracture toughness by 88% as compared to the unannealed specimen. Annealing at 160 °C improves the bi-material interfacial fracture toughness by a maximum of 1225% via sufficient interfacial wetting, higher molecular diffusion, and a longer polymer chain entanglement process. Material transfer, void collapse, and filament impression on the fracture surface of high temperature annealed specimen indicate a better molecular diffusion and strong interlaminar bond at the interface.
format article
author Md Fazlay Rabbi
Vijaya Chalivendra
author_facet Md Fazlay Rabbi
Vijaya Chalivendra
author_sort Md Fazlay Rabbi
title Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
title_short Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
title_full Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
title_fullStr Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
title_full_unstemmed Improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
title_sort improvement in interfacial fracture toughness of multi-material additively manufactured composites through thermal annealing
publisher Elsevier
publishDate 2021
url https://doaj.org/article/2ebd48fadc0a43289dc8ab6bac3d955f
work_keys_str_mv AT mdfazlayrabbi improvementininterfacialfracturetoughnessofmultimaterialadditivelymanufacturedcompositesthroughthermalannealing
AT vijayachalivendra improvementininterfacialfracturetoughnessofmultimaterialadditivelymanufacturedcompositesthroughthermalannealing
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