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Advances in material forming : Esaform 10 Years on - download pdf or read online

By Francisco Chinesta, Elias Cueto

ISBN-10: 128111748X

ISBN-13: 9781281117489

ISBN-10: 2287721428

ISBN-13: 9782287721427

ISBN-10: 2287721436

ISBN-13: 9782287721434

This publication teams the most advances in fabric forming, contemplating diversified methods, either traditional and non-conventional. It focuses

on polymers, composites and metals, that are analyzed from the state-of-the-art. detailed emphasis is dedicated to the contributions of the eu clinical organization for fabric Forming (ESAFORM) over the past decade and particularly those coming from its annual foreign conference.

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Example text

This model is not very satisfactory and gives rise, in the general case, to a contradiction. Indeed, each crystal having its own orientation, imposing a common stress expressed in the sample coordinate system to all the crystals consists in imposing a different stress to each crystal in its reference system. The yield locus of each crystal being quite anisotropic, the imposed stress cannot fall on the yield locus for each crystal. One can understand that no compatibility of the strain rate will be fulfilled between neighbouring grains with such an approach.

1 General features An important point when dealing with multiscale models is the micro-macro transition (or homogenization technique), which is necessary to deduce the macroscopic material behaviour from microscopic considerations. This step must be achieved with care because it determines the accuracy of the multiscale model. At this stage, different scales for the analysis of the problem are defined: x The scale of the sample: only the macroscopic stress field and strain rate field are important at that scale.

Moreover, the associated isotropic function must be a good approximation of the crystal plasticity response for an aggregate containing a random distribution of grain orientations. For plane stress, the anisotropic Yld2000-2d yield function I was defined as [32] I a a a S1c  S2c  2S2cc  S1cc  2S1cc  S2cc 2V a (9) S1c, S2c and S1cc, S2cc are the principal values of sc and scc , respectively. , three Cijc and five Cklcc . Independently, Banabic et al. based on the Barlat’89 criterion [27] have developed since 2000 [9] the so-called BBC family criteria [14], [18].

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Advances in material forming : Esaform 10 Years on by Francisco Chinesta, Elias Cueto


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