By Dr. Dorel Banabic, H.-J. Bunge, K. Pöhlandt, A. E. Tekkaya (auth.), Dr. Dorel Banabic (eds.)

ISBN-10: 3642087507

ISBN-13: 9783642087509

ISBN-10: 3662040131

ISBN-13: 9783662040133

After a short advent into crystal plasticity,the enjoyable- damentals of crystallographic textures and plastic anisotro- py, a major subject of this publication, are defined. a wide bankruptcy is dedicated to formability checking out either for bulk steel and sheet steel forming. For the 1st time checking out tools for plastic anisotropy of around bars and tubes are integrated. A profound survey is given of literature approximately yield standards for anisotropic fabrics as much as most modern advancements and the calculation of forming limits of anisotropic sheet me- tal. different chapters are excited by homes of workpieces after steel forming in addition to the basics of the idea of plasticity and finite aspect simulation of steel forming techniques. The publication is done by way of a suite of tables of foreign criteria for formability checking out and of circulation curves of metals that are most ordinarily utilized in steel forming. it truly is addressed either to school and business readers.

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Extra resources for Formability of Metallic Materials: Plastic Anisotropy, Formability Testing, Forming Limits

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8, holds for virtually all crystalline materials, be they metals, ceramics, (partly) crystalline polymers, or even geologic or biologic natural materials. In this book plastic formability of materials is considered both for bulk materials as well as for sheet materials. In the latter case it is convenient to subdivide plastic anisotropy into planar and normal anisotropy, as is shown schematically in Fig. 10. The normal anisotropy influences the maximwn drawability of sheet material and should thus be as high as possible as is shown in macroanisotropy of the material microanisotropy of crystals crystallites I I I I I I I I -I I-l_ _ I I ..

Glide plane normal and glide direction are exchanged in the two crystal structures. Then it follows immediately from Eq. 37) and hence the same plastic anisotropy expressed for instance by the r-value, Eq. 30 or by the yield locus, Eq. 33. As an example Fig. 25 shows the yield loci of three different fcc and bcc materials calculated from their respective textures. All three yield loci are in between those according to the v. Mises and Tresca hypotheses. The differences are due to the different rolling textures.

Glide systems {111}(112) have been considered (at least additional to {Ill }( 11 0») for fcc metals with low stacking fault energy such as brass and silver. Pencil glide {hk1}(111) is assumed to be the best-fitting deformation mode for bcc metals. Taking different glide systems into account then Eq. 36 is no more strictly valid (it is, however, a good first approximation). 4 Deformation Hardening Any change of the flow stresses ( j in the course of deformation is generally called deformation hardening.

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Formability of Metallic Materials: Plastic Anisotropy, Formability Testing, Forming Limits by Dr. Dorel Banabic, H.-J. Bunge, K. Pöhlandt, A. E. Tekkaya (auth.), Dr. Dorel Banabic (eds.)


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