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

By M. Predeleanu, P. Gilormini

Those lawsuits specialize in complex tools for predicting and averting the prevalence of defects in synthetic items. a brand new function is integrated, particularly, the impact of the processing-induced defects at the integrity of buildings. the next subject matters are constructed: harm modelling; harm overview and rupture; pressure localization and instability research; formability characterization; prediction of form inaccuracies; impact of defects on structural integrity. the most production operations are lined and diverse fabrics are tested, equivalent to new and standard steel alloys, ceramics, polymers and composites.

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CONCLUSION The numerical modelling of the microvoid behaviour in an elastic-plastic unit cell and the modified Rice and Tracey model are in good agreement for the prediction of the void volume fraction rate at the early stage of the damage phenomenon for uniaxial stress states and pure shear stress states so far the real shape of the void remains casi-ellipsoidal. Both models predict a positive rate for a void initially filled by an inclusion under any stress states whereas negative rates arise for an empty void under compressive or pure shear stress states.

0 i i ! i i : ' ................ : ' ................ : -,' ............... : , .... 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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