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TitleThe influence of pulse duration on the stress levels in ablation of ceramics: A finite element study
Author(s)Vila Verde, A.
Ramos, Marta M. D.
KeywordsMesoscopic modelling
Laser ablation
Finite elements
CO2 laser
pulse duration
stress transients
CO laser 2
Issue date30-Apr-2006
JournalApplied Surface Science
CitationVILA VERDE, A ; RAMOS, Marta M. D. - The influence of pulse duration on the stress levels in ablation of ceramics: a infinite element study. "Applied surface science" [Em linha]. 252:13, (30 Abr. 2006) 4511-4515. Disponível em WWW: < URL: >
Abstract(s)We present a finite element model to investigate the dynamic thermal and mechanical response of ceramic materials to pulsed infrared radiation. The model was applied to the specific problem of determining the influence of the pulse duration on the stress levels reached in human dental enamel irradiated by a CO2 laser at 10.6 mm with pulse durations between 0.1 and 100 ms and sub-ablative fluence. Our results indicate that short pulses with durations much larger than the characteristic acoustic relaxation time of the material can still cause high stress transients at the irradiated site, and indicate that pulse durations of the order of 10 ms may be more adequate both for enamel surface modification and for ablation than pulse durations up to 1 ms. The model presented here can easily be modified to investigate the dynamic response of ceramic materials to mid-infrared radiation and help determine optimal pulse durations for specific procedures.
Publisher version
AccessOpen access
Appears in Collections:CDF - FCT - Artigos/Papers (with refereeing)

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