Download Multiscale Phenomena in Plasticity: From Experiments to by Mrs. P. Cahn (auth.), Joël Lépinoux, Dominique Mazière, PDF

By Mrs. P. Cahn (auth.), Joël Lépinoux, Dominique Mazière, Vassilis Pontikis, Georges Saada (eds.)

A great quantity of study and effects at the mechanical behaviour of crystalline solids has the invention of dislocations within the early thirties. This pattern has been greater via the advance of robust experimental options. really X ray diffraction. transmission and scanning electron microscopy. microanalysis. The technological development has given upward push to the research of varied and intricate fabrics. to not communicate of these lately invented. whose mechanical houses have to be mastered. both for his or her lise as structural fabrics. or extra easily for detenllining their fonnability approaches. As is frequently the case this quickly progress has been diverted either by way of the burial of early basic effects that are rediscovered roughly effectively. and by means of the too quick book of faulty effects. which propagate largely. and are authorized with no feedback. Examples of those statements abound. and won't be quoted the following for the sake of dispassionateness. realizing the mechanical houses of fabrics implies using a number of experimental thoughts. mixed with a superb theoretical wisdom of elasticity. thermodynamics and stable kingdom physics. the new improvement of varied computing device recommendations (simulation. ab initio calculations) has additional to the trouble of accumulating the experimental details. and gaining knowledge of the theoretical knowing. No laboratory is supplied with all of the attainable experimental settings. virtually no scientist masters all this theoretical kno\vledge. for this reason. cooperation among scientists is required greater than even before.

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In its simpler version it consists in writing that an arc of dislocation fixed at both ends experiences a force DR, normal to the dislocation line, and exert a force T on its ends. R is the radius of curvature of the line, Tis the line tension. 5pb2 (1) As is obvious from the definition, this approximation neglects the effect of the part of the dislocation which is outside the dislocation segment. This approximation provides two fundamental results: • An arc of dislocation of length I pinned at its two ends, submitted to a stress larger than: u=rr=pb (2) C hi I acts as a dislocation source emitting dislocation loops [4].

I. (1938) Analysis of plastic strain in a cubic crystal, in Stephen Timoshenko 60th Anniversary Volume, Macmillan, New York, pp. 218-224. 32. I. (1956) Strains in crystalline aggreggates, in R. ) Proc. Colloq. on Deformation and Flow ofSolids (Madrid 1955), Springer, Berlin, pp. 3-12. 33. Batchelor, George (1996) The Life and Legacy ofG.! Taylor, Cambridge University Press. 34. Pineau, A. (1996) Effect of inhomogeneities in the modelling of mechanical behaviour and damage of metallic materials, in La Mise en Forme des Materiaux: Vingt Ans de Recherche aux CEMEF, Ecole des Mines de Paris, Paris.

The increase in resistance does not result from a specific interaction between dislocations and grain boundaries. A similar effect is observed at phase boundaries. When the second phase exists as precipitates, this leads to various situations. Precipitates coherent with the matrix may be sheared. An ordered second phase in a disordered matrix induces pairing of dislocations. Incoherent particles are bypassed. These remarks do not exclude the existence of a specific interaction between dislocations and phase boundaries.

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