Download Advanced Methods in Materials Processing Defects by M. Predeleanu, P. Gilormini PDF

By M. Predeleanu, P. Gilormini

Those lawsuits concentrate on complicated tools for predicting and heading off the prevalence of defects in synthetic items. a brand new characteristic is incorporated, particularly, the effect of the processing-induced defects at the integrity of buildings. the subsequent issues are constructed: harm modelling; harm assessment and rupture; pressure localization and instability research; formability characterization; prediction of form inaccuracies; effect of defects on structural integrity. the most production operations are coated and numerous fabrics are tested, corresponding to new and standard steel alloys, ceramics, polymers and composites.

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This analysis, based on the finite element method, is applied to torsion and notched tensile tests and offers satisfying results. The comparison of the numerical approach with experimental observations leads us to introduce a nucleation term in our model, resulting in a noticeable improvement of its capabilities. 2. MESOSCOPIC APPROACH The mesoscopic approach consists of evaluating, with finite element analysis, the void growth in a representative cell containing a simple cavity, or an inclusion, embedded in an elasto-plastic matrix (cf.

C. L. Chow, J. Wang, An Anisotropic Theory of Elasticity for Continuum Damage Mechanics, Int. J. Fract. 33, 3-16, 1987. L. Chaboche, Continuous Damage Mechanics--A Tool to Describe Phenomena Before Crack Initiation, Nucl. Engng Des. 64, 233-247, 1981. L. Chaboche, Anisotropic Creep Damage in the Framework of Continuum Damage Mechanics, Nucl. Engng. Des. 79, 309-319, 1984. J. L. Chow, On Constitutive Equations of Inelastic Solids with Anisotropic Damage, J. Theory Appl. Fract. Mech. 14,187-218, 1990.

Brethenoux, P. Mazataud # , E. Bourgain +, M. Muzzi* and J. Giusti IRSID, LAMEF Department, BP 30320, 57283 Maizi+res-l+s-Metz, France 1. INTRODUCTION During cold forming processes, steels are submitted to both ductile damage and strain hardening. These two competing mechanisms determine the mechanical properties of the final product, in particular its fracture resistance and fatigue life. In the present context of constant renewal of products and improvement of their capabilities, it is essential to be able to predict the evolution of the local damage in a component, from its conception and through each transformation stage fight up to its final state.

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