Quantitative prediction of long-term failure of Polycarbonate

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Abstract

Time-to-failure of polymers, and the actual failure mode, are influenced by stress,temperature, processing history, and molecular weight. We show that long term ductilefailure under constant load is governed by the same process as short term ductilefailure at constant rate of deformation. Failure proves to originate from the polymer’sintrinsic deformation behaviour, more particularly the true strain softening after yield,which inherently leads to the initiation of localized deformation zones. In a previousstudy we developed a constitutive model that includes physical ageing and is capableof numerically predicting plastic instabilities. Using this model the ductile failureof polycarbonates with different thermal histories, subjected to constant loads, is accuratelypredicted also for different loading geometries. Even the endurance limit,observed for quenched materials, is predicted and it is shown that it originates fromthe structural evolution due to physical ageing that occurs during loading. For lowmolecular weight materials this same process causes a ductile-to-brittle transition. Aquantitative prediction thereof, is, however, outside the scope of this paper and requiresa more detailed study.
Original languageEnglish
Pages (from-to)7009-7017
Number of pages9
JournalMacromolecules
Volume38
Issue number16
DOIs
Publication statusPublished - 2005

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polycarbonate
Polycarbonates
Aging of materials
Constitutive models
Failure modes
Polymers
Durability
Molecular weight
Plastics
Geometry
Processing

Cite this

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title = "Quantitative prediction of long-term failure of Polycarbonate",
abstract = "Time-to-failure of polymers, and the actual failure mode, are influenced by stress,temperature, processing history, and molecular weight. We show that long term ductilefailure under constant load is governed by the same process as short term ductilefailure at constant rate of deformation. Failure proves to originate from the polymer’sintrinsic deformation behaviour, more particularly the true strain softening after yield,which inherently leads to the initiation of localized deformation zones. In a previousstudy we developed a constitutive model that includes physical ageing and is capableof numerically predicting plastic instabilities. Using this model the ductile failureof polycarbonates with different thermal histories, subjected to constant loads, is accuratelypredicted also for different loading geometries. Even the endurance limit,observed for quenched materials, is predicted and it is shown that it originates fromthe structural evolution due to physical ageing that occurs during loading. For lowmolecular weight materials this same process causes a ductile-to-brittle transition. Aquantitative prediction thereof, is, however, outside the scope of this paper and requiresa more detailed study.",
author = "E.T.J. Klompen and T.A.P. Engels and {Breemen, van}, L.C.A. and P.J.G. Schreurs and L.E. Govaert and H.E.H. Meijer",
year = "2005",
doi = "10.1021/ma0504973",
language = "English",
volume = "38",
pages = "7009--7017",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
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Quantitative prediction of long-term failure of Polycarbonate. / Klompen, E.T.J.; Engels, T.A.P.; Breemen, van, L.C.A.; Schreurs, P.J.G.; Govaert, L.E.; Meijer, H.E.H.

In: Macromolecules, Vol. 38, No. 16, 2005, p. 7009-7017.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Quantitative prediction of long-term failure of Polycarbonate

AU - Klompen, E.T.J.

AU - Engels, T.A.P.

AU - Breemen, van, L.C.A.

AU - Schreurs, P.J.G.

AU - Govaert, L.E.

AU - Meijer, H.E.H.

PY - 2005

Y1 - 2005

N2 - Time-to-failure of polymers, and the actual failure mode, are influenced by stress,temperature, processing history, and molecular weight. We show that long term ductilefailure under constant load is governed by the same process as short term ductilefailure at constant rate of deformation. Failure proves to originate from the polymer’sintrinsic deformation behaviour, more particularly the true strain softening after yield,which inherently leads to the initiation of localized deformation zones. In a previousstudy we developed a constitutive model that includes physical ageing and is capableof numerically predicting plastic instabilities. Using this model the ductile failureof polycarbonates with different thermal histories, subjected to constant loads, is accuratelypredicted also for different loading geometries. Even the endurance limit,observed for quenched materials, is predicted and it is shown that it originates fromthe structural evolution due to physical ageing that occurs during loading. For lowmolecular weight materials this same process causes a ductile-to-brittle transition. Aquantitative prediction thereof, is, however, outside the scope of this paper and requiresa more detailed study.

AB - Time-to-failure of polymers, and the actual failure mode, are influenced by stress,temperature, processing history, and molecular weight. We show that long term ductilefailure under constant load is governed by the same process as short term ductilefailure at constant rate of deformation. Failure proves to originate from the polymer’sintrinsic deformation behaviour, more particularly the true strain softening after yield,which inherently leads to the initiation of localized deformation zones. In a previousstudy we developed a constitutive model that includes physical ageing and is capableof numerically predicting plastic instabilities. Using this model the ductile failureof polycarbonates with different thermal histories, subjected to constant loads, is accuratelypredicted also for different loading geometries. Even the endurance limit,observed for quenched materials, is predicted and it is shown that it originates fromthe structural evolution due to physical ageing that occurs during loading. For lowmolecular weight materials this same process causes a ductile-to-brittle transition. Aquantitative prediction thereof, is, however, outside the scope of this paper and requiresa more detailed study.

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JF - Macromolecules

SN - 0024-9297

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