By Viggo Tvergaard, Alan Needleman (auth.), Prof. Dr.-Ing. Dieter Besdo, Prof. Dr.-Ing. Erwin Stein (eds.)
ISBN-10: 3642848338
ISBN-13: 9783642848339
ISBN-10: 3642848354
ISBN-13: 9783642848353
The IUTAM-Symposium on "Finite Inelastic Deformations - conception and functions" happened from August 19 to 23, 1991, on the collage of Hannover, Germany, with seventy five members from 14 international locations. Scope of the symposium used to be a basic therapy of recent advancements in plasticity and visco-plasticity at finite traces. This lined the phenomenological fabric conception in accordance with continuum mechanics in addition to the remedy of microstructural phenomena detected by way of exact experimental datas. In a constrained quantity, lectures on new experi psychological amenities for measuring finite lines have been additionally applied into the symposium. one other vital subject of the symposium was once the remedy of trustworthy and potent computational tools for fixing engineering issues of finite inelastic traces. Wi skinny this context it used to be an important function that concept, numerical and computational research have been be obvious in an built-in manner. In overall nine classes with 37 lectures, a lot of them given by means of renowned keynote-lecturers, and a poster consultation with 10 contributions met absolutely our expectancies of a excessive rating updated discussion board for the interplay of 4 subject matters, specifically the actual and mathematical modelling of finite pressure inelastic deformations together with localizations and harm in addition to the achievements within the numerical research and implementation and the answer of advanced engineering structures. targeted and significant positive aspects have been trustworthy fabric datas from macroscopic and microscopic checks in addition to try out result of complicated engineering difficulties, like deep drawing and extrusion.
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Additional resources for Finite Inelastic Deformations — Theory and Applications: IUTAM Symposium Hannover, Germany 1991
Sample text
L While the 0'12 keeps increasing, the 0'11 becomes ftrst tensile as the initially predominant effect of kinematic hardening shifts the surface to the right (recall that the 0'22 shown in Fig. 1 equals -0'11). Then, 0'11 turns left and going through zero becomes increasingly compressive as the ovalization and rotation of the surface dominates over the effect of kinematic hardening at later stages of deformation. Finally, 35 the evolution of the yield surface reaches a saturation stage from all three points of view (kinematic, orthotropic intensity and orientation).
In the present work we first review the "scale-invariance" approach outlined in [2) and used in [3) to obtain physically based constitutive equations for the plastic stretching. back stress (modelling anisotropy) and plastic spin (modelling texture development). Such a theory may be viewed as a compromise between "multlslip" crystal plasticity averaging models and purely continuum plasticity models. The theory is then modified to account for the heterogeneity of plastic flow occurring during the shear banding process.
The disadvantage is the big amount of CPU time as several parameter sets lead to no result. The quality of each parameter set is determined by comparison with uniaxial experiments using weight functions for the quadratic deviation of the plastic strain and strain rate. In the case of Miller's model additional weight functions for the internal variables were introduced to ensure that these variables will come to a steady state.
Finite Inelastic Deformations — Theory and Applications: IUTAM Symposium Hannover, Germany 1991 by Viggo Tvergaard, Alan Needleman (auth.), Prof. Dr.-Ing. Dieter Besdo, Prof. Dr.-Ing. Erwin Stein (eds.)
by John
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