Creep failure time prediction of polymers and polymer composites

Spathis, G; Kontou, E

dc.contributor.author	Spathis, G	en
dc.contributor.author	Kontou, E	en
dc.date.accessioned	2014-03-01T11:46:41Z
dc.date.available	2014-03-01T11:46:41Z
dc.date.issued	2012	en
dc.identifier.issn	02663538	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/38021
dc.subject	A. Polymer-matrix composites (PMCs)	en
dc.subject	A. Polymers	en
dc.subject	B. Creep	en
dc.subject	C. Failure criterion	en
dc.subject.other	Accumulated strain	en
dc.subject.other	Creep failure time	en
dc.subject.other	Creep rates	en
dc.subject.other	Creep ruptures	en
dc.subject.other	Creep strain	en
dc.subject.other	Failure criteria	en
dc.subject.other	Minimum value	en
dc.subject.other	Model parameters	en
dc.subject.other	Polymer composite	en
dc.subject.other	Polymermatrix composites (PMCs)	en
dc.subject.other	Rate process	en
dc.subject.other	Small strains	en
dc.subject.other	Specific time	en
dc.subject.other	Stress levels	en
dc.subject.other	Theoretical approach	en
dc.subject.other	Thermally activated	en
dc.subject.other	Viscoplastic	en
dc.subject.other	Composite materials	en
dc.subject.other	Creep	en
dc.subject.other	Creep testing	en
dc.subject.other	Elasticity	en
dc.subject.other	Forecasting	en
dc.subject.other	Polymer matrix composites	en
dc.subject.other	Quantum chemistry	en
dc.subject.other	Strain	en
dc.subject.other	Polymers	en
dc.title	Creep failure time prediction of polymers and polymer composites	en
heal.type	other	en
heal.identifier.primary	10.1016/j.compscitech.2012.03.018	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.compscitech.2012.03.018	en
heal.publicationDate	2012	en
heal.abstract	A theoretical approach for the prediction of creep rupture time of polymers and polymer composites is analyzed in the present work. This analysis takes into account the viscoelastic path at small strains and the viscoplastic path at higher stresses. The calculation of the rate of creep strain is based on a thermally activated rate process, while the emergence and growth of plastic strain, with increasing creep time, is also taken into account. When the accumulated strain attains values, high enough to lead to failure, its slope versus time exhibits an abrupt change. At this specific time, the creep rate function in respect to time appears a minimum. The creep failure time is defined as the time where the creep rate takes its minimum value. The model has been tested for various types of polymeric materials, as well as for polymer composites. Once the model parameters are estimated from short time creep strain data, then it was proved to successfully predict the creep failure time at a variety of stress levels, for all material types examined. © 2012 Elsevier Ltd.	en
heal.journalName	Composites Science and Technology	en
dc.identifier.doi	10.1016/j.compscitech.2012.03.018	en
dc.identifier.volume	72	en
dc.identifier.issue	9	en
dc.identifier.spage	959	en
dc.identifier.epage	964	en