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

By M. Predeleanu, P. Gilormini

Those lawsuits specialize in complex equipment for predicting and keeping off the prevalence of defects in synthetic items. a brand new function is integrated, specifically, the impact of the processing-induced defects at the integrity of buildings. the next issues are built: harm modelling; harm evaluate and rupture; pressure localization and instability research; formability characterization; prediction of form inaccuracies; impression of defects on structural integrity. the most production operations are lined and numerous fabrics are tested, corresponding to new and standard steel alloys, ceramics, polymers and composites.

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The purpose of introducing a damage characteristic tensor J, like the introduction of plastic characteristic tensor H in the theory of plasticity, is to take account of the anisotropic nature of damage growth. The damage characteristic tensor J, which is a extension of the formulation due to [8, 10], is proposed on the basis of the damage energy equivalence. J-2 J~lJ2 J2 ~Jx/~lJ~ J~~2J~ (18) Jxf~2J3 / J3 J In the case of damage hardening materials, the equivalent damage energy released rate increases with the total damage growth, and hence, the anisotropic parameters in the above equation should also vary.

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. 8 R. Hill, The Mathematic Theory of Plasticity, Oxford, 1950.

I I-- : : ; ................ : ', : : 1 ............................... 8 l fracture strain Figure 7. Void growth in the mesoscopic cell during tensile test simulation. 2. Characterization of the ductile damage propensity Contrary to the case of the torsion test, these steel grades contain different types of inclusions and the total inclusion volume can no longer be considered to equal the cementite volume. In this case, the analysis method involves iterations on the initial porosity vo in the mesoscopic model, in order to fit as close as possible the experimental results.

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