An analytical solution is developed for thermal stress in exponentially time decaying laser short-pulse heating of a metallic surface. Because the heating duration is short, a nonequilibrium heating model incorporating the electron kinetic theory approach is used to formulate the temperature distribution during the laser heating pulse. Thermomechanical coupling is introduced in the analysis to formulate the thermal stress field. Thermodynamic irreversibility is considered and the entropy generation rate due to heat transfer and thermal stress field is formulated during the heating process. It is found that temperature decays gradually in the surface region and becomes sharp as the distance increases towards the solid bulk. Thermal stress is compressive in the irradiated region. Thermodynamic irreversibility due to heat transfer dominates thermodynamic irreversibility because of the thermal stress field. Résumé :Nous présentons une solution analytique pour la contrainte thermique due à une impulsion laser à décroissance exponentielle sur une surface métallique. Parce que le chauffage est de courte durée, nous utilisons un modèle de chauffage hors d'équilibre incorporant la théorie cinétique des électrons afin de formuler la distribution de température pendant l'impulsion laser. L'introduction d'un couplage thermomécanique permet de décrire le champ de contrainte thermique. Nous tenons compte de l'irréversibilité thermodynamique et nous formulons le taux de génération d'entropie dû au transfert de chaleur et au champ de contrainte thermique pendant le processus, pour trouver que la diminution de température qui est graduelle dans la région du chauffage devient rapide à distance. La contrainte thermique est compressive dans la région du chauffage. L'irréversibilité thermodynamique due au transfert de chaleur est plus importante que celle due à la contrainte thermique. [Traduit par la Rédaction]
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.