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Measuring damage variables from load-unload test (damage mechanics)

Submitted by dithoap on
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damage mechanics
measurement of evolution of damage variable

Hi All,

I want to use ductile damage model in ABAQUS to model the damage of thermoplastic polymers, in which I need to input the damage evolution law (\dot{d}).

My question is on the way we have to measure the variable d.

Suppose I have 10 cycles of load-unload test. For slope of the first load will be initial Young's modulus at undamaged state E_0. now for the next cycle, which part of the curve we need to measure their slope to get the damage variable (d = 1 - E/E_0).

Median Review Time of all ASME Journals

Submitted by Yonggang Huang on
research

I attended an ASME meeting during which the Managing Director of ASME Publishing reported on the ASME publications. 

 

Please find two of his slides related to the ASME journals, in which he singled out JAM for its rapid publication.  The first slide is the median review time (from submission to editor’s final decision) in 2014 for all 27 ASME journals, for which JAM is the fastest -- 2 months (in 2014).  The second slide gives the median review time from 2010 to 2015 for JAM, and the newest data point is 1.2 months for 2015. 

Temperature induced crack propagation in structured media

Submitted by Giorgio Carta on
research
thermal striping
thermal shock
fracture
crack propagation
elastic lattice
microstructure
Nonlinear problem

This paper describes the propagation of an edge crack in a semi-infi nite triangular lattice, consisting of identical point masses connected by thermoelastic links. A change of temperature, represented by a time-periodic series of high-gradient temperature pulses, is applied at the boundary of the lattice. In order to make the initial crack advance in the lattice a failure criterion is imposed, whereby the links break as soon as they attain a prescribed elongation.

Create simple ODB without submitting a job

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Abaqus python script

Hello. 

I'm looking to create a simple ODB file using my model in session so that I can display an orientation tensor in a custom field.  I'm able to create an ODB for a 2d part (made of s4 elements), but my system crashes whenever I load the ODB for my 3d part (made of c3d8 elements).

Here is my script. Any help would be greatly appreciated!

 

from abaqusConstants import * 

from odbAccess import *

from textRepr import *

odb = Odb(name='4',

    analysisTitle='derived data',

Amorphous intergranular films as toughening structural features

Submitted by Zhiliang Pan on
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The ability of amorphous intergranular films to mitigate damage formation at grain boundaries is studied with molecular dynamics simulations. We find that such films can alter both crack nucleation and crack growth rates by efficiently absorbing dislocations, with thicker films being more effective sinks.

2015 Melosh Medalist and Finalists

Submitted by John E. Dolbow on
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melosh competition

 

The Annual Robert J. Melosh Competition for the Best Student Paper in Finite Element Analysis was held last Friday, April 24, on the campus of Duke University.  

The winner of the 2015 Melosh Medal is Maurizio Chiaramonte, from Stanford University, for his paper “The H-Version of the Method of Auxiliary Mapping for Higher Order Solutions of Crack Problems.”   

Maurizio was selected as the winner on the basis of both his written paper and his oral presentation.  The other finalists at the 2015 competition were:

(σ1-σ3) VS Axial strain in abaqus

Submitted by digvijay_kumar_singh on
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 I am modeling drained triaxial compression test. I modeled soil as cylindrical part in abaqus. Bottom part of cylinder is fixed and on top displacement is applied. I used Dynamic/explicit steps. After running model and getting .odb file, couldn't match stress strain diagram from experimental results. I don't know whether i am calculating stress in right way or not. Can anybody guide me in this regard? Advanced thanks for your reply.
How to plot (σ1-σ3) vs axial strain in Abaqus?

viscoelastic modelling in abaqus

Submitted by h.civil on
research

hello

im a new abaqus user and i want to model a viscoelastic material (asphalt) in abaqus . i have uniaxial creep test data for characterize viscoelastic behaviour . my question is how can i enter viscoelastic parameters in abaqus?is there any way to put creep test data directely in abaqus??

in abaqus for modelling viscoelastic material in time domain there are three ways:

1)combined test data

2)shear test data

3)volumetric test data

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