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Journal ArticleDOI

Development of non-iterative self correcting solution (nonss) method for the viscoplastic analysis with the chaboche model

About: This article is published in International Journal for Numerical Methods in Engineering.The article was published on 1998-10-30. It has received 7 citations till now. The article focuses on the topics: Tangent stiffness matrix & Viscoplasticity.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a numerical analysis is performed to evaluate the thermal loads and the stresses in the calandria vessel following a severe core damage accident in a PHWR, and the strain rate and the vessel failure have been evaluated for the above scenario.

15 citations

Journal ArticleDOI
TL;DR: In this paper, a detailed investigation is conducted by using numerical simulation on the two pressure vessel (RPV) with and without crust layer respectively, and the authors assesses the likelihood and potential failure location, time and mode of the lower head (LH) under the loadings of the critical heat flux (CHF) and slight internal pressure.

7 citations

Book ChapterDOI
01 Jan 2010
TL;DR: In this article, the authors give an overview of life management issues of fast neutron spectrum (SFRs) and present state-of-the-art PLiM practices for SFRs.
Abstract: This chapter gives an overview of life management issues of sodium cooled fast neutron spectrum reactors (SFRs). The topics covered in this chapter include robust design and validation, design by analysis philosophy, materials selection, manufacturing processes, state-of-the-art operation and maintenance strategies, meticulous in-service inspection, materials behaviour and ageing management, human resources and knowledge and asset management. The present state-of-the-art of PLiM practices for SFRs is reviewed and future trends in life assessment procedures and R&D required for further enhancing the safety and reliability of SFRs are highlighted.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compared the most common unified viscoplastic models in the local and finite element levels for the decision upon the most efficient model for a tin-based solder token as the test material.
Abstract: Solder materials are critical packaging compounds and due to usually weakest melting temperature among packaging constitutive materials, thus, they are frequently subjected to a multitude of physical phenomena: creep, fatigue and combined hardening effects The complexity and interaction of such factors must be considered in suitable way in the mechanical behavior modeling using the appropriate material behavior laws The choice of the mechanical model depends on several factors such as the complexity of constitutive equations to be integrated, the availability and suitability of implementation in the FE codes, the number of parameters to be identified, the capability of the model to represent the most common physical features of the material… Following these observations and in order to deal with these critical remarks, comparisons between the most common unified viscoplastic models should be done in the local and finite element levels for the decision upon the most efficient model That is the aim of this paper with application to a tin based solder token as the test material

3 citations

Proceedings ArticleDOI
26 Apr 2010
TL;DR: In this paper, the authors compare the most common unified viscoplastic models in the local and finite element levels for the decision upon the most efficient model for a tin-based solder token as the test material.
Abstract: Solder materials are critical packaging compounds and due to usually weakest melting temperature among packaging constitutive materials, thus, they are frequently subjected to a multitude of physical phenomena: creep, fatigue and combined hardening effects. The complexity and interaction of such factors must be considered in suitable way in the mechanical behaviour modelling using the appropriate material behaviour laws. The choice of the mechanical model depends on several factors such as the complexity of constitutive equations to be integrated, the availability and suitability of implementation in the FE codes, the number of parameters to be identified, the capability of the model to represent the most common physical features of the material… Following these observations and in order to deal with this critical remarks, comparisons between the most common unified viscoplastic models should be done in the local and finite element levels for the decision upon the most efficient model. That is the aim of this paper with application to a tin based solder token as the test material.

2 citations


Cites background from "Development of non-iterative self c..."

  • ...[5] Chaboche [6] are "painfully" implemented in the FE codes by suitable integration algorithms....

    [...]

References
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01 Jan 1987
TL;DR: In this article, the authors present an experiment experimentale sur des echantillons soumis a des essais de rupturefluage a 600 C. L'examen metallographique permet l'estimation quantitative de fissuration intergranulaire lors des essai de fluage.
Abstract: Etude experimentale sur des echantillons soumis a des essais de rupture-fluage a 600 C. L'examen metallographique permet l'estimation quantitative de fissuration intergranulaire lors des essais de fluage. Determination du dommage par calculs numeriques bases sur des criteres de rupture. Comparaison entre les resultats des calculs et experimentaux

2 citations

Journal ArticleDOI
TL;DR: In this paper, a numerical method for evaluating partial derivatives of the constitutive equations is developed, thus avoiding the cumbersome task of analytically re-deriving the partial derivatives when improvements to the non-linear constitutive model are evaluated.
Abstract: The NONSS method for numerically integrating time-dependent constitutive equations requires evaluation of the partial derivatives of the constitutive equations. A numerical method for evaluating these partial derivatives has been developed, thus avoiding the cumbersome task of analytically re-deriving the partial derivatives when improvements to the constitutive model are evaluated. This method is based upon the adaptive finite-difference algorithm published by Stepleman and Winarsky. Modifications of their algorithm are described that allow its efficient use within an extended version of NONSS, called NONSS-ND. Using the MATMOD constitutive equations, the capabilities of NONSS-ND are demonstrated by comparing the results of a wide variety of deformation simulations with those of NONSS, for which the derivatives are computed from analytical solutions. The numerical differentiation within NONSS-ND is shown to be sufficiently accurate for use in integrating time-dependent constitutive equations, but results in a 30–100 per cent increase in computation time. Multi-element structural calculations are therefore found to be uneconomical, but NONSS-ND is well suited for testing alternative constitutive models owing to its accuracy and its general applicability to highly non-linear systems of differential equations.

1 citations