Effect of environmental condition on essential work of fracture of proton exchange membranes

Effect of environmental condition on essential work of fracture of proton exchange membranes

The essential work of fracture (EWF) is a key property in understanding the fracture resistance in polymer membranes. As such, it is a promising approach when investigating the fracture resistance of proton exchange membrane in fuel cells. The longevity of these membranes is crucial to the good func...

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Autores principales: Thibaud VERMOT DES ROCHES, Yuki ARAI, Masaki OMIYA
Formato: article
Lenguaje:EN
Publicado: The Japan Society of Mechanical Engineers 2015
Materias:
essential work of fracture
proton exchange membrane fuel cell
nafion
double-edge notch tensile test
temperature
humidity
finite element method
cohesive zone model
Mechanical engineering and machinery
TJ1-1570
Acceso en línea:https://doaj.org/article/80f12ba71a8b43c3b1359b4ef950bd49
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spelling oai:doaj.org-article:80f12ba71a8b43c3b1359b4ef950bd492021-11-26T06:30:10ZEffect of environmental condition on essential work of fracture of proton exchange membranes2187-974510.1299/mej.15-00320https://doaj.org/article/80f12ba71a8b43c3b1359b4ef950bd492015-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/5/2_15-00320/_pdf/-char/enhttps://doaj.org/toc/2187-9745The essential work of fracture (EWF) is a key property in understanding the fracture resistance in polymer membranes. As such, it is a promising approach when investigating the fracture resistance of proton exchange membrane in fuel cells. The longevity of these membranes is crucial to the good function of the cell: the membranes have to sustain important variations in the surrounding temperature and humidity, possibly affecting their fracture resistance. This study investigated the essential work of fracture of such proton exchange membranes using a double-edge notch tensile test (DENT test). The tests were performed for different environmental conditions that were relevant to the conditions met by proton exchange membrane fuel cells. The results of the DENT tests strongly depend on the temperature and humidity; in particular the high temperature cases show a large increase of dissipated energy. Based on experimental results, a numerical model was developed and the numerical simulations of DENT tests were performed. The obtained results suggest that the shape factor of plastic zone, β, should be a function of the ligament length and the quadratic regression is appropriate to the calculation of EWFs when the temperature is near the glass transition temperature. The EWFs under ambient temperature (30 °C) conditions were found to be 18.4 kJ/m2 for 50 %RH and 21.5 kJ/m2 for 100 %RH. Those under high temperature (80 °C) conditions were found to be 48.0 kJ/m2 for 50 %RH and 56.4 kJ/m2 for 100 %RH.Thibaud VERMOT DES ROCHESYuki ARAIMasaki OMIYAThe Japan Society of Mechanical Engineersarticleessential work of fractureproton exchange membrane fuel cellnafiondouble-edge notch tensile testtemperaturehumidityfinite element methodcohesive zone modelMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 5, Pp 15-00320-15-00320 (2015)
institution DOAJ
collection DOAJ
language EN
topic essential work of fracture
proton exchange membrane fuel cell
nafion
double-edge notch tensile test
temperature
humidity
finite element method
cohesive zone model
Mechanical engineering and machinery
TJ1-1570
spellingShingle essential work of fracture
proton exchange membrane fuel cell
nafion
double-edge notch tensile test
temperature
humidity
finite element method
cohesive zone model
Mechanical engineering and machinery
TJ1-1570
Thibaud VERMOT DES ROCHES
Yuki ARAI
Masaki OMIYA
Effect of environmental condition on essential work of fracture of proton exchange membranes
description The essential work of fracture (EWF) is a key property in understanding the fracture resistance in polymer membranes. As such, it is a promising approach when investigating the fracture resistance of proton exchange membrane in fuel cells. The longevity of these membranes is crucial to the good function of the cell: the membranes have to sustain important variations in the surrounding temperature and humidity, possibly affecting their fracture resistance. This study investigated the essential work of fracture of such proton exchange membranes using a double-edge notch tensile test (DENT test). The tests were performed for different environmental conditions that were relevant to the conditions met by proton exchange membrane fuel cells. The results of the DENT tests strongly depend on the temperature and humidity; in particular the high temperature cases show a large increase of dissipated energy. Based on experimental results, a numerical model was developed and the numerical simulations of DENT tests were performed. The obtained results suggest that the shape factor of plastic zone, β, should be a function of the ligament length and the quadratic regression is appropriate to the calculation of EWFs when the temperature is near the glass transition temperature. The EWFs under ambient temperature (30 °C) conditions were found to be 18.4 kJ/m2 for 50 %RH and 21.5 kJ/m2 for 100 %RH. Those under high temperature (80 °C) conditions were found to be 48.0 kJ/m2 for 50 %RH and 56.4 kJ/m2 for 100 %RH.
format article
author Thibaud VERMOT DES ROCHES
Yuki ARAI
Masaki OMIYA
author_facet Thibaud VERMOT DES ROCHES
Yuki ARAI
Masaki OMIYA
author_sort Thibaud VERMOT DES ROCHES
title Effect of environmental condition on essential work of fracture of proton exchange membranes
title_short Effect of environmental condition on essential work of fracture of proton exchange membranes
title_full Effect of environmental condition on essential work of fracture of proton exchange membranes
title_fullStr Effect of environmental condition on essential work of fracture of proton exchange membranes
title_full_unstemmed Effect of environmental condition on essential work of fracture of proton exchange membranes
title_sort effect of environmental condition on essential work of fracture of proton exchange membranes
publisher The Japan Society of Mechanical Engineers
publishDate 2015
url https://doaj.org/article/80f12ba71a8b43c3b1359b4ef950bd49
work_keys_str_mv AT thibaudvermotdesroches effectofenvironmentalconditiononessentialworkoffractureofprotonexchangemembranes
AT yukiarai effectofenvironmentalconditiononessentialworkoffractureofprotonexchangemembranes
AT masakiomiya effectofenvironmentalconditiononessentialworkoffractureofprotonexchangemembranes
_version_ 1718409787698315264

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