Análisis comparativo de expresiones analíticas para modelizar el comportamiento tenso-deformacional no lineal del acero inoxidable
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hdl:2099.1/16423
Correu electrònic de l'autorromain.westeelgmail.com
Tipus de documentTesina
Data2012-06
Condicions d'accésAccés obert
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Abstract
[ANGLÈS] Stainless steel is a relatively recent material that combines excellent corrosion
resistance and mechanical properties suitable for structural applications. But its
nonlinear stress-strain behaviour, different from the typical carbon steel, explains,
among other reasons, that it has had very little presence in the field of construction as a
structural element. In the literature, there are different analytical expressions that
reproduce this behaviour, all of them based on the original expression of Ramberg-
Osgood.
In this paper, the differences between these models are analyzed in order to determine
the most appropriate expression, and suggest values for the parameters that fit properly
the behaviour of the material, especially for different grades of ferritic stainless steel.
Therefore, an interactive program is developed, reusable for any series of experimental
data, and criteria for the determination of the initial elastic modulus (E0) are proposed.
It is also demonstrated that the analytical expressions proposed by Rasmussen for
determining, on the one hand, the parameters of non-linearity (n, m) and the ultimate
strain (εu), included in the European code Eurocode 3, and on the other hand the
ultimate tensile strength (σu) obtained from the Ramberg-Osgood parameters (E0, σ0.2
and n), do not provide good estimations in the case of ferritic alloys. Therefore, new
analytical expressions to determine these parameters are developed in this paper.
Compared with a reasonable range of experimental data, the expressions provide a
good accuracy, which then participates in improving the modelling of the stress-strain
behaviour for ferritic stainless steel. [CASTELLÀ] Se analizan las diferencias entre los modelos propuestos en la literatura para modelizar el comportamiento tenso-deformacional no lineal del acero inoxidable, y se proponen valores optimizados de los parámetros que ajusten convenientemente dicho comportamiento. Se modifican las fórmulas propuestas por Rasmussen para aplicarlas al caso del acero inoxidable ferrítico.
MatèriesSteel, Stainless, Building, Iron and steal, Deformations (Mechanics), Acer inoxidable, Construccions metàl·liques, Deformacions (Mecànica)
TitulacióENGINYERIA DE CAMINS, CANALS I PORTS (Pla 1995)
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