Advanced Methods in Materials Processing Defects - download pdf or read online

By M. Predeleanu, P. Gilormini

ISBN-10: 044482670X

ISBN-13: 9780444826701

Those lawsuits specialize in complex equipment for predicting and averting the incidence of defects in synthetic items. a brand new characteristic is integrated, particularly, the effect of the processing-induced defects at the integrity of constructions. the next 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 diverse fabrics are tested, akin to new and traditional steel alloys, ceramics, polymers and composites.

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This smooth evolution, in comparison with the one observed in torsion test (cf. figure 4), makes it less easy to determine precisely the <) fracture strain. Figure 6. Evolution of the mesoscopic mesh during tensile test simulation. -i 6~ .............. i ................ i................ i ................ i..... 02 .............. 01 .............. 0 i i ! i i : ' ................ : ' ................ : -,' ............... : , .... I I-- : : ; ................ : ', : : 1 ...............................

8 1 total equivalent strain i I ~ " ', ! 4 fracture strain Figure 4. Void growth in the mesoscopic cell during torsion test simulation. 2. Comparison with the experimental results Mesoscopic fracture strains can be estimated very precisely using void growth curves. These deformation values are then compared to experimental values derived from the number of revolutions 9 2~NR = r:'_ V3 L (1) where R and L are respectively the radius and length of the specimen.

01 0 ~ ' ~; --"-4" .... ---I--- 0 I , . 4 total equivalent strain Figure 10. 1%). Figure 11. Introduction of nucleation in the mesoscopic analysis. All the steel grades used for tensile test application have ferrite-perlite structures ; but on the contrary to the one of 27CrMo4 and 42CrMo4, the perlite of 22MnCrB5 is globular. It is possible that the annealing has improved the cohesion between the metallic matrix and the carbides. This could explain why the nucleation has to be taken into account in the case of 22MnCrB5.

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


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