TY - RPRT

T1 - MM98.83 Quantification of Combined Strain Paths

AU - Nielsen, Morten Sturgård

AU - Lindegren, Maria

AU - Wanheim, Tarras

PY - 1998

Y1 - 1998

N2 - When working with processes where large plastic deformation
occurs, a way of desribing the deformation process is to view the
whole deformation history as a curve in the 6-dimensional shear
strain normal strain space, henceforth called a strain history
curve (SHC). This paper focuses on the SHC concept and the
uniqueness of the SHC representation.The SHC may be used to give a
useful representation of the total course of the deformation with
respect to directions and magnitudes of strains, snd hence the
development of the plastic properties, butmay also be used for
developing variables describing 3D-plasticity. Adirect use of the
SHC, is to measure the yield surface at different points at a SHC,
thus establishing data describing the importance of strain
rotations or even strain reversals within a process. Two subcases
for displaying SHC will be mentioned:The plane strain case and the
single sheared case. Here the latter is a superset of plateworking
processes and axisymmetrical processes.The origin and use of the
SHC in this paper, is to make a method of classifying processes
after strain path and hence the need for using advanced plasticity
models. As an example the extrusion process is displayed. To
quantify a process it is necessary to study strain path for the
whole volume. Thereafter these strain paths can be plotted and
modelled.

AB - When working with processes where large plastic deformation
occurs, a way of desribing the deformation process is to view the
whole deformation history as a curve in the 6-dimensional shear
strain normal strain space, henceforth called a strain history
curve (SHC). This paper focuses on the SHC concept and the
uniqueness of the SHC representation.The SHC may be used to give a
useful representation of the total course of the deformation with
respect to directions and magnitudes of strains, snd hence the
development of the plastic properties, butmay also be used for
developing variables describing 3D-plasticity. Adirect use of the
SHC, is to measure the yield surface at different points at a SHC,
thus establishing data describing the importance of strain
rotations or even strain reversals within a process. Two subcases
for displaying SHC will be mentioned:The plane strain case and the
single sheared case. Here the latter is a superset of plateworking
processes and axisymmetrical processes.The origin and use of the
SHC in this paper, is to make a method of classifying processes
after strain path and hence the need for using advanced plasticity
models. As an example the extrusion process is displayed. To
quantify a process it is necessary to study strain path for the
whole volume. Thereafter these strain paths can be plotted and
modelled.

M3 - Report

BT - MM98.83 Quantification of Combined Strain Paths

ER -