Un modèle thermo-plastique couplé à l'endommagement pour le béton à hautes températures

Autor:	Fékri Meftah, Jean-Marie Reynouard, Wahid Nechnech
Rok vydání:	2001
Předmět:	chemistry.chemical_classification Thermoplastic Materials science Computer simulation Fracture mechanics Thermal expansion chemistry Thermal Hardening (metallurgy) Composite material Elastic modulus General Environmental Science Civil and Structural Engineering Tensile testing
Zdroj:	Canadian Journal of Civil Engineering. 28:593-607
ISSN:	1208-6029 0315-1468
Popis:	In this paper a new thermoplastic damage model for plain concrete subjected to combined thermal and cyclic loading is developed using the concept of plastic-work hardening and stiffness degradation in continuum damage mechanics. Two damage variables are used: one for mechanical action and the other one for thermal action. Further, thermomechanical interaction strains have been introduced to describe the influence of mechanical loading on the physical process of thermal expansion of concrete. The constitutive relations for elastoplastic responses are decoupled from the degradation damage responses by using the effective stress concept. This method provides advantages in the numerical implementation. Efficient computational algorithms for the proposed model are subsequently explored and performance of this model is demonstrated with numerical examples.Key words: damage theory, plasticity, thermal, unilateral phenomenon, thermomechanical interaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::35b57a366ca0e99239edc03052c3c6de https://doi.org/10.1139/l01-030 Zobrazit plný text záznamu Plný text ve formátu PDF