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- W2059589630 abstract "Negative work-hardening rates are precursors of plastic instabilities. The objective of the work is to determine the origin of the stress decrease in the case of prestrained sheet metals. Samples of low carbon steel and pure aluminium deformed in rolling and reloaded in simple shear exhibit softening for specific shear directions with respect to the rolling direction. Structural and textural evolutions are analysed with transmission electron microscopy and X-ray measurements, respectively. The low carbon steel shows clear evidence of intragranular structural destabilization while the Taylor factor, estimated by self-consistent calculations, remains nearly constant. It is deduced that for steel, the softening has a structural origin. By contrast the aluminium samples present identical structural changes whatever the sign of the work-hardening rate. It is shown that the latter is strongly correlated with Taylor factor evolutions. A textural instability is obtained in this case. Des échantillons prédéformés d'acier doux et d'aluminium pur présentent lors d'une recharge en cisaillement simple un adoucissement de la contrainte. Les effets respectifs de la texture cristallographique, mesurée par diffraction de rayons X, et des structures intragranulaires, observées par microscopie électronique en transmission, ont été analysés. L'objectif de ce travail est de déterminer les poids respectifs de ces deux paramètres sur la stabilité mécanique des métaux concernés. Dans le cas de l'acier doux, la diminution de la contrainte d'écoulement est attribuée à une déstabilisation structurale. Celle-ci est attestée par la formation de microbandes intragranulaires. A l'inverse, l'adoucissement de d'aluminium est fortement corrélé aux évolutions du facteur de Taylor calculées à l'aide d'un modèle auto-cohérent. Dans ce cas, l'instabilité est d'origine texturale." @default.
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- W2059589630 date "1999-02-01" @default.
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- W2059589630 title "Textural vs structural plastic instabilities in sheet metal forming" @default.
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- W2059589630 doi "https://doi.org/10.1016/s1359-6454(98)00417-0" @default.
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