A finite element model for calculating the stresses in bars with microstructure loaded by ultra-short laser pulses

Filopoulos, SP; Papathanassiou, TK; Tsamasphyros, GJ

dc.contributor.author	Filopoulos, SP	en
dc.contributor.author	Papathanassiou, TK	en
dc.contributor.author	Tsamasphyros, GJ	en
dc.date.accessioned	2014-03-01T01:29:32Z
dc.date.available	2014-03-01T01:29:32Z
dc.date.issued	2009	en
dc.identifier.issn	0149-5739	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19296
dc.subject	Dipolar gradient elasticity	en
dc.subject	Finite elements	en
dc.subject	Generalized thermoelasticity	en
dc.subject	Non-Fourier heat transfer	en
dc.subject	Thermal stresses	en
dc.subject	Uncoupled thermoelasticity	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Mechanics	en
dc.subject.other	Dipolar gradient elasticity	en
dc.subject.other	Finite elements	en
dc.subject.other	Generalized thermoelasticity	en
dc.subject.other	Non-Fourier heat transfer	en
dc.subject.other	Uncoupled thermoelasticity	en
dc.subject.other	Elastohydrodynamics	en
dc.subject.other	Finite element method	en
dc.subject.other	Fourier transforms	en
dc.subject.other	Heat exchangers	en
dc.subject.other	Heat transfer	en
dc.subject.other	Laser pulses	en
dc.subject.other	Pulsed laser applications	en
dc.subject.other	Strain rate	en
dc.subject.other	Thermal stress	en
dc.subject.other	Thermoelasticity	en
dc.subject.other	Wave propagation	en
dc.subject.other	Elasticity	en
dc.title	A finite element model for calculating the stresses in bars with microstructure loaded by ultra-short laser pulses	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/01495730903102533	en
heal.identifier.secondary	http://dx.doi.org/10.1080/01495730903102533	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	A finite element solution for the thermal stress field, generated in elastic bars with micro-structure is presented in this paper. The heat transfer phenomenon is governed by the non-Fourier law of Maxwell-Vernotte-Cattanneo. Heat losses due to free convection are supposed to occur along the bar. The micro-structure is taken into account in the elastic model by adopting the first strain gradient model. As a first approximation, the effects of micro-inertia are ignored. Furthermore, the thermal and mechanical fields are assumed uncoupled, so that the energy equation is independent of any strain rates. As a model problem, we consider a micro-bar, mechanically fixed and thermally insulated at both ends, stimulated by an ultra-short laser pulse. For the spatial discretization of the heat equation, we use quadratic C0-continuous Lagrange elements, while for the corresponding gradient elasticity equations, Hermite C1-continuous elements are employed. The semi-discrete system of equations is integrated in time using the implicit Newmark method. However, for this class of wave propagation problems, the explicit Newmark or equivalently, the central difference method is the most suitable. Nonetheless, some sort of numerical smoothing procedures are needed to avoid the numerical oscillations which are not physical.	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Journal of Thermal Stresses	en
dc.identifier.doi	10.1080/01495730903102533	en
dc.identifier.isi	ISI:000269694600004	en
dc.identifier.volume	32	en
dc.identifier.issue	9	en
dc.identifier.spage	905	en
dc.identifier.epage	922	en