Extraordinary Bauschinger Effect in Gradient Structured Copper

Kinematic hardening rules are employed in classical plasticity to capture the so–called Bauschinger effect. They are important when describing the material response during reloading. In the framework of thermodynamically consistent gradient plasticity theories, kinematic hardening effects were first incorporated into a micropolar plasticity model by Grammenoudis and Tsakmakis. The aim of the present paper is to investigate this model by predicting size effects in torsional loading of circular cylinders. It is shown that kinematic hardening rules compared with isotropic hardening rules, as adopted in the paper, provide more possibilities for modelling size effects in the material response, even if only monotonous loading conditions are considered.

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Bauschinger effect in particulate SiC-6061 aluminum composites

Materials Science and Engineering A ◽

10.1016/0921-5093(90)90140-x ◽

1990 ◽

Vol 124 (2) ◽

pp. 103-111 ◽

Cited By ~ 28

Author(s):

M. Taya ◽

K.E. Lulay ◽

K. Wakashima ◽

D.J. Lloyd

Keyword(s):

Bauschinger Effect ◽

Aluminum Composites

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The Development of Large Diameter and Thickness X80 HSAW Linepipe

2008 7th International Pipeline Conference, Volume 3 ◽

10.1115/ipc2008-64500 ◽

2008 ◽

Cited By ~ 3

Author(s):

Weiwei Li ◽

Chunyong Huo ◽

Qiurong Ma ◽

Yaorong Feng

Keyword(s):

Bauschinger Effect ◽

Pipeline Steel ◽

Large Diameter ◽

Base Material ◽

Longitudinal Direction ◽

Strength Loss ◽

Ring Test ◽

Low Carbon ◽

Pipeline Project ◽

Submerged Arc

For the requirement of 2nd West-East Pipeline Project of China, X80 large diameter & thickness linepipe with helical seam submerged arc welded (HSAW) were developed, with 1219 mm OD and 18.4 mm WT. Acicular ferrite type and super-low carbon, high Niobium chemical composition pipeline steel was adopted for the base material. The very stringent requirements at −10 °C for toughness, i.e. 220J/170J for average/minimum for pipe body and 80J/60J for average/minimum for weld and HAZ were meet successfully. The yield strength loss due to Bauschinger effect was found lower than 20MPa, which benefited. The very low residual stress level was testified by cut-ring test which cuts a section pipe about exceed 100mm long, and then cut the section apart from welds 100mm along the longitudinal direction.

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Crystal Plasticity Predictions of Forward-Reverse Simple Shear Flow Stress

Materials Science Forum ◽

10.4028/www.scientific.net/msf.702-703.204 ◽

2011 ◽

Vol 702-703 ◽

pp. 204-207 ◽

Cited By ~ 1

Author(s):

Young Ung Jeong ◽

Frédéric Barlat ◽

Myoung Gyu Lee

Keyword(s):

Flow Stress ◽

Crystal Plasticity ◽

Simple Shear ◽

Bauschinger Effect ◽

Texture Evolution ◽

Simple Shear Flow ◽

Plasticity Model ◽

Lower Yield Stress ◽

Crystal Plasticity Model ◽

Stress Reversals

The flow stress behavior of a bake-hardenable steel during a few simple shear cycles is investigated using a crystal plasticity model. The simple shear test provides a stable way to reverse the loading direction. Stress reversals were accompanied with a lower yield stress, i.e., the Bauschinger effect, followed by a transient hardening stage with a plateau region and, permanent softening. The origins of these three distinct stages are discussed using a crystal plasticity model. To this end, the representative discrete grain set is tuned to capture such behavior by coupling slip system hardening appropriately. The simulated results are compared with experimental forward-reverse simple shear stress-strain curves. It is shown that the characteristic flow stress stages are linked to texture evolution and to the Bauschinger effect acting on the different slip systems.

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