Characterization of Steels Using a Revised Kinematic Hardening Model Incorporating Bauschinger Effect

2003 ◽  
Vol 125 (3) ◽  
pp. 277-281 ◽  
Author(s):  
Anthony P. Parker ◽  
Edward Troiano ◽  
John H. Underwood ◽  
Charles Mossey
Keyword(s):  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Compressive Loading ◽  
Tensile Loading ◽  
Linear Strain ◽  
Subsequent Work ◽  
Hardening Model ◽  
New Variant ◽  
Initial Load

A new variant of the nonlinear kinematic hardening model is proposed which accommodates both nonlinear and linear strain hardening during initial tensile loading and reduced elastic modulus during initial load reversal. It also incorporates the Bauschinger effect, as a function of prior tensile plastic strain, during the nonlinear compressive loading phase. The model is shown to fit experimental data from a total of five candidate gun steels. The numerical fits will be employed in subsequent work to predict residual stresses and fatigue lifetimes for autofrettaged tubes manufactured from the candidate steels.

Characterization of Steels Using a Revised Kinematic Hardening Model Incorporating Bauschinger Effect

2002 ◽  
Author(s):  
Anthony P. Parker ◽  
Edward Troiano ◽  
John H. Underwood ◽  
Charles Mossey
Keyword(s):  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Hardening Model

Effects of Hardening Models on CUO Forming and Springback Simulation of High Strength Line Pipes

2015 ◽  
Vol 817 ◽  
pp. 8-13 ◽  
Author(s):  
Qiang Ren ◽  
Tian Xia Zou ◽  
Da Yong Li
Keyword(s):  
Bauschinger Effect ◽  
Oil And Gas ◽  
Kinematic Hardening ◽  
High Strength ◽  
Isotropic Hardening ◽  
Forming Process ◽  
Hardening Model ◽  
Hardening Models ◽  
Combined Hardening ◽  
Springback Prediction

The UOE process is an effective approach for manufacturing the line pipes used in oil and gas transportation. During the UOE process, a steel plate is crimped along its edges, pressed into a circular pipe with an open-seam by the successively U-O forming stages. Subsequently, the open-seam is closed and welded. Finally, the welded pipe is expanded to obtain a perfectly round shape. In particular, during the O-forming stage the plate is suffered from distinct strain reversal which leads to the Bauschinger effect, i.e., a reduced yield stress at the start of reverse loading following forward strain. In the finite element simulation of plate forming, the material hardening model plays an important role in the springback prediction. In this study, the mechanical properties of API X90 grade steel are obtained by a tension-compression test. Three popular hardening models (isotropic hardening, kinematic hardening and combined hardening) are employed to simulate the CUO forming process. A deep analysis on the deformation and springback behaviors of the plate in each forming stage is implemented. The formed configurations from C-forming to U-forming are almost identical with three hardening models due to the similar forward hardening behaviors. Since the isotropic hardening model cannot represent the Bauschinger effect, it evaluates the higher reverse stress and springback in the O-forming stage which leads to a failure prediction of a zero open-seam pipe. On the contrary, the kinematic hardening model overestimates the Bauschinger effect so that predicts the larger open-seam value. Specifically, the simulation results using the combined hardening model show good agreement in geometric configurations with the practical measurements.

A Practical Two Surface Plasticity Theory

1975 ◽  
Vol 42 (3) ◽  
pp. 641-646 ◽  
Author(s):  
R. D. Krieg
Keyword(s):  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Uniaxial Stress ◽  
Plasticity Theory ◽  
Experimental Results ◽  
Limit Surface ◽  
Hardening Model ◽  
Loading Surface ◽  
Surface Plasticity ◽  
Usual Concept

A plasticity theory is presented using the usual concept of a loading surface which moves and isotropically grows, but in addition uses a “limit surface” which grows and moves independently and encloses the loading surface. The plastic stiffness is a function of the distance between the surfaces at the loading point. Characteristics of the theory are a smoother transition between elastic and plastic regions on loading, an inherent Bauschinger effect, and more latitude on the description of hardening characteristics than the traditional methods used in structural codes. The full capability of the theory requires a memory of three vectors and three scalars, while some of the foregoing characteristics can be retained with only two vectors, the same as a traditional kinematic hardening model. The multiaxial theory is presented, particularized, specialized to uniaxial stress and the equations solved. The theory is compared to uniaxial stress experimental results.

Neutron Diffraction Study of Extruded Magnesium during Cyclic and Elevated Temperature Loading

2005 ◽  
Vol 490-491 ◽  
pp. 257-262 ◽  
Author(s):  
E.C. Oliver ◽  
Mark R. Daymond ◽  
Philip J. Withers
Keyword(s):  
Neutron Diffraction ◽  
Bauschinger Effect ◽  
Compressive Loading ◽  
Tensile Loading ◽  
Neutron Diffraction Study ◽  
Intergranular Strain ◽  
Tension And Compression ◽  
Two Temperatures ◽  
Higher Temperature ◽  
Compressive Tests

Neutron diffraction has been used to study the progress of deformation twinning and intergranular strain evolution in extruded magnesium during cyclic and monotonic loading at two temperatures. Differences in the intergranular strains generated during tensile and compressive tests are attributed to the operation of twinning in compression. Twinning activity is reduced relative to slip at higher temperature, leading to greater similarities between tension and compression. During cyclic loading, a distinct Bauschinger effect is observed after each compressive loading stage. The origin of this effect is identified as the reversal of twinning during unloading and subsequent tensile loading.

Springback of Copper Alloy Sheets after U-Bending

2014 ◽  
Vol 510 ◽  
pp. 118-122 ◽  
Author(s):  
Hiroshi Hamasaki ◽  
Yasuhiro Hattori ◽  
Kingo Furukawa ◽  
Fusahito Yoshida
Keyword(s):  
Copper Alloy ◽  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Alloy Sheet ◽  
Isotropic Hardening ◽  
Hardening Model ◽  
Cyclic Tension ◽  
Cold Rolled ◽  
Simulation Results ◽  
Strain Responses

Springback after U-bending of Cu-Ni-Si alloy sheet and cold-rolled brass sheets (JIS C2600R-H and C2600R-1/4H) was calculated by using FEM. In the simulations, the Yoshida-Uemori kinematic hardening model was employed, by which stress-strain responses under uniaxial tension and cyclic tension-compression loadings are accurately described. The simulation results using Yoshida-Uemori model well predicted the experimentally obtained springback, while the isotropic hardening model underestimated it for every material. From such comparisons between experiment and simulation, it is concluded that the Bauschinger effect as well as the plastic strain dependency on Youngs modulus should be taken into account for an accurate springback simulation.

scholarly journals Isolation and characterization of the new SARS-CoV-2 variant in travellers from the United Kingdom to India: VUI-202012/01 of the B.1.1.7 lineage

2021 ◽  
Vol 28 (2) ◽  
Author(s):  
Pragya D Yadav ◽  
Dimpal A Nyayanit ◽  
Rima R Sahay ◽  
Prasad Sarkale ◽  
Jayshri Pethani ◽  
...  
Keyword(s):  
United Kingdom ◽  
Severe Acute Respiratory Syndrome ◽  
Surveillance System ◽  
The United Kingdom ◽  
Isolation And Characterization ◽  
New Variant ◽  
The Uk ◽  
Local Transmission

We have isolated the new severe acute respiratory syndrome coronavirus-2 variant of concern 202 012/01 from the positive coronavirus disease 2019 cases that travelled from the UK to India in the month of December 2020. This emphasizes the need for the strengthened surveillance system to limit the local transmission of this new variant.

Characterization of the Bauschinger effect in an extruded aluminum alloy

2018 ◽  
Vol 10 (3-4) ◽  
pp. 175-190 ◽  
Author(s):  
R.R. McCullough ◽  
J.B. Jordon ◽  
P.G. Allison ◽  
D.J. Bammann ◽  
Lyan Garcia ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Bauschinger Effect

scholarly journals Emergence of Salmonid Alphavirus Genotype 2 in Norway—Molecular Characterization of Viral Strains Circulating in Norway and Scotland

Viruses ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1556
Author(s):  
Monika J. Hjortaas ◽  
Elena Fringuelli ◽  
Adérito L. Monjane ◽  
Aase B. Mikalsen ◽  
Christine M. Jonassen ◽  
...  
Keyword(s):  
Full Length ◽  
Genomic Diversity ◽  
Last Common Ancestor ◽  
Source Of Infection ◽  
New Variant ◽  
Genotype 2 ◽  
Boat Traffic ◽  
Horizontal Spread ◽  
Full Length Genome

Pancreas disease (PD) and sleeping disease (SD), caused by an alphavirus, are endemic in European salmonid aquaculture, causing significant mortality, reduced growth and poor flesh quality. In 2010, a new variant of salmonid alphavirus emerged in Norway, marine salmonid alphavirus genotype 2 (SAV2). As this genotype is highly prevalent in Scotland, transmission through well boat traffic was hypothesized as one possible source of infection. In this study, we performed full-length genome sequencing of SAV2 sampled between 2006 and 2012 in Norway and Scotland, and present the first comprehensive full-length characterization of Norwegian marine SAV2 strains. We analyze their relationship with selected Scottish SAV2 strains and explore the genetic diversity of SAV. Our results show that all Norwegian marine SAV2 share a recent last common ancestor with marine SAV2 circulating in Scotland and a higher level of genomic diversity among the Scottish marine SAV2 strains compared to strains from Norway. These findings support the hypothesis of a single introduction of SAV2 to Norway sometime from 2006–2010, followed by horizontal spread along the coast.

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