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ABAQUS - the influence of changing kinematic and cycling hardening parameters

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Hello,

 

I have recently done a simple hourglass model to check the influence of hardening parameters in Abaqus. The reason was the effects of the parameters' change in bigger models were a bit surprising, therefore I needed to investigate the reason using some simpler model. Please see file 1.

 

After performing tension/compression cycles I got results as shown in files 2, 3, 4 and 5. Please note that only the hardening parameter in the description changes, the other three stays the same for each series.

 

rajan_prithivi's picture

Basics of plasticity theory in 6 min

This video explains the very fundamental points with regard to plasticity theory. It covers the following -

 

1) Why study plasticity ?

2) Additive decomposition of strain

3) stress and strength

4) Yield condition , flow rule & hardening rule

 

-Prithivi

Bin Liu's picture

How to Realize Volume Conservation During Finite Plastic Deformation

Volume conservation during plastic deformation is the most important feature and should be realized in elastoplastic theories. However, it is found in this paper that an elastoplastic theory is not volume conserved if it improperly sets an arbitrary plastic strain rate tensor to be deviatoric. We discuss how to rigorously realize volume conservation in finite strain regime, especially when the unloading stress free configuration is not adopted in the elastoplastic theories.

WaiChing Sun's picture

WCCM Mini-symposium 1701: Computational Geomechanics

Dear colleagues:

We invite you to present a talk within the Computational Geomechanics mini-symposium (Session ID: 1701) at the World Congress on Computational Mechanics (WCCM XIII) in New York City from July 22-27th, 2018. The call for abstracts will be open between October 15 and December 31, 2017. The mini-symposium description is provided below.

Session Description:

Postdoc seeking in field of Mechanical or Materials Science Engineering

My name is Lifei Wang, from China. I am 28 years old, and I have been finished my P.H.D degree in July 2015.   Now I'm looking for a postdoc research position in the field of Mechanical or Material Science Engineering. 

Multi-scale finite element modeling of magnesium medical devices

<p>Applications are invited from suitably qualified candidates for two full-time Postdoctoral Researcher positions on the finite element simulation of magnesium orthopaedic implants. These three year fixed term positions are funded through a US-Ireland R&amp;D Partnership Programme involving collaboration between the SFI Centre for Research in Medical Devices (Cúram), the NSF Engineering Research Centre Revolutionizing Metallic Biomaterials (RMB, USA), and the Nanotechnology and Integrated Bioengineering Centre (NIBEC, Northern Ireland).

Nanoscale Mechanics of the Solid Electrolyte Interphase on Lithiated-Silicon Electrodes

Hello Imechanica community, we have just published our study on the mechanics of SEI in Li-ion batteries. Please find the abstract and link as below. 

 

Abstract:

Multi-scale finite element modelling of magnesium medical devices

Applications are invited from suitably qualified candidates for two full-time Postdoctoral Researcher positions on the finite element simulation of magnesium orthopaedic implants. These three year fixed term positions are funded through a US-Ireland R&D Partnership Programme involving collaboration between the SFI Centre for Research in Medical Devices (Cúram), the NSF Engineering Research Centre Revolutionizing Metallic Biomaterials (RMB, USA), and the Nanotechnology and Integrated Bioengineering Centre (NIBEC, Northern Ireland).

Interested candidates should send a CV to patrick.mcgarry@nuigalway.ie

The start date for both positions is September-November 2017.

Nonlinear programming and closest point return plasticity

New article:  Nonlinear programming and closest point return plasticity http://www.parresianz.com/mechanics/plasticity/algorithm/primal-dual-closest-point-return/

This article tries to justify the use of backward Euler stress updates.

-- Biswajit

Sharlotte Kramer's picture

Sandia Fracture Challenge: Survey

The Sandia Fracture Challenge (SFC) was issued in December 2016, and the SFC supplemental information became available in February 2017.  The predictions are due July 15th, 2017.  We would appreciate feedback from you regarding the Challenge prior to the return of the predictions.   Please email Sharlotte Kramer (slkrame@sandia.gov) and Brad Boyce (blboyce@sandia.gov) with (1) your intent to participate in this SFC and/or (2) any comments you may have on the Challenge.

Sharlotte Kramer's picture

Sandia Fracture Challenge Update

Supplemental information for the third Sandia Fracture Challenge (SFC) is now available!  We have compiled the supplemental information promised in the original information packet and some additional information based on questions we received from participants.  The supplemental information includes electron backscatter diffraction (EBSD) data on the Challenge geometry, additional base material tests, raw DIC images and examples of DIC analyses of base material tests, and additional boundary condition information.

Drucker Prager Plasticity model

Hi All,

I am trying to code the Drucker prager plasticity model for the 2D plane strain case using consistent tangent modulus. I am using C++, therefore I would appreciate if anyone could share relevant materials which I could use and preferrably for the 2D case so it is not unnecessarily complicated.

 

Postdoctoral Position in Mesoscale Plasticity

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Sharlotte Kramer's picture

The 3rd Sandia Fracture Challenge is here!

The third Sandia Fracture Challenge is here!  We invite to you participate in this next installment of our collaborative, blind assessment of predictions of ductile fracture.  For the third SFC, we wanted to challenge the computational mechanics community to predict ductile fracture in an additively manufactured structure.

WaiChing Sun's picture

PhD student or Postdoc Position available at Columbia University

A PhD or postdoc position is available in  computational multiscale modelling of geological materials at my research group.Interested candidates please visit http://gradengineering.columbia.edu/onlineapplication for general information. Answers of general admission question can be found at http://gradengineering.columbia.edu/frequently-asked-questions-2.  

WaiChing Sun's picture

EMI San Diego Mini-symposium on Geomechanics (MS61)

Dear colleagues, 

We would like to invite you to submit abstracts for our mini-symposium (MS61) on Computational Geomechanics in the upcoming EMI conference (June 4-7, 2017) at San Diego. The scope of the mini-symposium is listed below:

Lazuardi Pujilaksono's picture

Fatigue crack propagation

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Hi, I'm trying to perform a supposedly-simple experiment on fatigue crack propagation of UHMWPE. I use a compact-tension specimen on a servopulser hidraulic testing machine. I will try to do the experiment on a fix Pmax with a varied force ratio (R) from 0.1 to 0.5. I'm having trouble in deciding the maximum force Pmax. How does one decide the amount of force applied for FCP testing? Calculation steps and so on.

Plasticity model in Abaqus to capture the continues plastic strain of granular material under triaxial cyclic loading?

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I am working on modelling ballast aggregates under triaxial loading. Confining pressure applied in the intermediate and minor principal direction and cyclic compression load applied in the major principal axis direction. I wanted to capture the continues plastic strain (PS) with cycles (N). My test results show that the PS increase with N up to about 10,000 cycles and the rate of strain slowly diminish for later cycles and almost stay constant after N=100,000. What available model in Abaqus can be used to get this behaviour. I have to run my analysis at least for 10,000 cycles.

Multi-scale modeling of plastic deformations in nano-scale materials; Transition to plastic limit

Despite the controversial debates concerning a unified theory, the continuum plasticity has evolved during the last few decades and an uncountable number of articles has been published on the subject. The proposal of Lee to decompose the deformation gradient, F, into elastic part Fe and plastic part Fp (i.e. F=FeFp) combined with the principle of maximum plastic dissipation is used in many publications to formulate the ensuing developments.

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