Identification of cyclic and anisotropic behaviour of ODS steels tubes

被引:6
|
作者
Vanegas, E. [1 ]
Mocellin, K. [1 ]
Loge, R. [1 ]
机构
[1] Mines Paristech, CNRS UMR 7635, Ctr Mise Forme Mat CEMEF, F-06904 Sophia Antipolis, France
关键词
Constitutive model identification; numerical simulation; cyclic and anisotropic behaviour; ODS; tubes; PLASTICITY;
D O I
10.1016/j.proeng.2011.04.201
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper, an elastic plastic behaviour model based on internal state variables is investigated. The final aim is to describe the mechanical stress-strain cyclic response of oxide dispersion strengthened (ODS) steels during the cold pilgering process. In this tube forming operation, a material element undergoes a series of small incremental deformations, alternatively under tensile and compressive stresses. The cyclic model considers isotropic hardening and kinematic hardening which can be related to the typical continuous cyclic softening of the ODS steels. Moreover, the identification process of the cyclic model parameters involves experimental data from only one sample. ODS steels tubes usually reveal an anisotropic strength in the radial, ortho-radial and longitudinal directions due to a crystallographic and strongly elongated grain morphology in the rolling direction. Identification of 3 Hill's parameters is done using compression tests of cylindrical specimens cut in three different directions (longitudinal, radial and ortho-radial) combined with an inverse analysis. (C) 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of ICM11
引用
收藏
页码:1208 / 1213
页数:6
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