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Journal Club Theme of July 2015: Reconfigurable metamaterials -- putting the holes in the right place

Reconfigurable metamaterials -- putting the holes in the right place


Shu Yang1 and Jie Yin2

1Department of Materials Science and Engineering, University of Pennsylvania, E-mail:

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Errors in FRANC3D software

Hello to all,

My project is crack propagation in expander wheel.

I did static analysis in abaqus and i used FRANC3D for crack modelling.

I insert crack in FRANC3D, surface meshing is done but not volume meshing.

It gave me this error:

backtracking stagnating: restarting contraction

What is this error?

Can anyone help me?

I attach 2 pictures. First picture shows the meshing and another shows crack location.

wazy's picture

Fatigue life discrtization based on loading mode

Dear All,

Fatigue life prediction for metal usually presented in terms of LEFM (mode-I).

In case where both (mode I+II) involoved, it is noted that the crack propagates under mixed mode for a number of cycles before turn to mode I till failure. Thus, the process of predicting fatigue life could be expressed by 2-different stages and No. of cycles. Begining from the last  one above (modeI), it  could ld be reached using LEFM method.

wazy's picture

Initial crack cycles

Dear All,

How could I calculate the no. cycles before turning to mode I for inclind loading angles for cracked plate.

' Li-Chun Bian' present graph for intial crack cycles-loading angles in his paper"Fatigue life prediction of the plates with an inclined surface crack' based on test result but ha did not mention how could get this graph numerically.




PhD Opening-Fall 2015


 Available PhD position – Fall 2015 

Rutgers, The State University of New Jersey

Mechanical and Aerospace Engineering

Complex Fluids and Soft Matter Laboratory 


Contradiction in calculating Logrithmic strain from ABAQUS


I am trying to extract logrithmic strains from Abaqus and then trying to compare with the experimental ones but I am getting different results. I found out the in Abaqus it uses slightly different formula then what I use theoretically.

In abaqus it computes LE from the following formula:

LE = plastic strain - true stress/E

But what I believe is that it should be like:

LE = plastic strain - yield stress/E

Can any one highlight why abaqus is using the first formula for LE calculation?

Rong Tian's picture

Positions in CAEP Software Center for High Performance Numerical Simulation (Beijing, China)

The newly setup "CAEP software center for high performance numerical simulation", located in Beijing, China, is recruiting.

The center is focused on large-scale numerical simulation on petaflops systems such as Tianhe-2 etc.

The R&D of the center spans broad areas of high performance numerical simulation including preprocessing (CAD, mesh generation), parallel visualization, high performance middleware, computational mechanics (nonlinear FEM, GFEM/XFEM, SPH/MPM), mental and energetic materials, nuclear physics, electromagnetics etc. 

Haitao Zhang's picture

Full-Time Position in Schlumberger

The below position is still open:

Job Description

Responsibilities: You will closely collaborate with Schlumberger design engineers in US, Europe, and Asia. You will be performing FEA studies in technically challenging areas such as non-linear solid mechanics, metal plasticity, viscoelastic materials, shock, vibration, heat transfer, composites, and fluid/structure interactions. You will also need to present FEA results to various internal or external clients.

Acta Mechanica Sinica's picture

Theme Articles on Mechanics of High Speed Rail may Interest you ——Published on Acta Mechanica Sinica

Dear everyone!

Welcome to theme articles on current research progress on mechanics of high speed rail published on SCI-indexed journal


Theme Articles on Mechanics of High Speed Rail

Guest editor: Yujie Wei

sandeep@iit_guwahati's picture

A new time integration scheme for dynamic problems

(Master's thesis attached)An extension to an implicit time integration scheme of Silva and Bezerra has been proposed . It is proposed to combine the Newmark scheme with the three point backward Euler scheme to have more user controlled numerical properties like high frequency dissipation. Also, the stability, accuracy, and dissipation of the proposed scheme have been studied. This is achieved by studying the spectral radius, period elongation, and amplitude decay.

A PHD position in QCM-based gas sensors

A PHD Research Assistantship is available in the Department of Material Science and Engineering, University of North Texas-Denton in the fields of modeling and experiment of QCM (Quartz crystal microbalance)-based gas sensor. The position will start from Spring, 2016. Candidates should have a Bachelor/Master's degree in engineering mechanics, mechanical engineering or electrical engineering with good academic standing and should have some experiences in the following:

Crushable Foam Model Calibration


I am currently facing difficulties in calibrating abaqus crushable foam model with my experimental results.
I think I am bit confused about what values needs to be input in the model. 
Right now my elastic properties are: E=400 MPa, v=0 (because its crushing)
In plastic under crushable foam I use compression yield stress ratio =1
and hydrostatic yield stress ratio =0.1.

Yuhang Hu's picture

1st Midwest Mechanics of Materials and Structures workshop at UIUC campus on Aug. 26th 2015

The departments of Mechanical Science and Engineering and Civil and Environmental Engineeing at University of Illinois Urbana Champaign will be cohosting the first Midwest Mechanics of Materials and Structures workshop at UIUC this Summer (Aug. 26th, 2015).

BICTAM Short Course on Insights from Nanomaterials in Beijing in Aug. of 2015

An intensive three-half-day short course on nano materials will be organized by BICTAM from August 11th to 13th in Beijing this summer.

OA Journal—Theoretical & Applied Mechanics Letters Volume 5, Issue 4 online now!


Dear everyone,

The third issue in 2015 (Volume 5, Issue 4) of Theoretical and Applied Mehcanic Letters (TAML) is now online.

Welcome to this OA journal or for rapid publication of your exciting results. 


OA Journal—Theoretical & Applied Mechanics Letters Volume 5, Issue 3 online now!

Dear everyone,

The third issue in 2015 (Volume 5, Issue 3) of Theoretical and Applied Mehcanic Letters (TAML) is now online.

Welcome to this OA journal or for rapid publication of your exciting results.


How to determine the Centre of rotation in Abaqus/CAE

I need to determine the centre of rotation of the head of the femur and acetabular bones using Abaqus.
How can I find the centre of rotation for a sphere and a concave surface (the head of the femur and acetabulum bones) in Solid Edge?

Thank you.

bitamendi's picture

Looking for a VUMAT programmer to share publication with

Dear researchers,


I’m Joseba Mendiguren, researcher at the Advanced Manufacturing Group of Mondragon Unibertsitatea. I’m currently working on advanced yielding/hardening models for metals.
I’m in the middle of a paper writing work but I cannot find time to sit down and program the VMAT that I need to run some simulations for the paper. I’m looking for a VUMAT programmer researcher willing to work on the topic and share the publication authorship on return.

Ductile crack modeling with XFEM and Damage criterion in Abaqus

Good mourning, i'll ask a quick and strightforward question abour Abaqus fracture analysis capabilities, in case of a crack in a ductile material, when one want to use arbitrary path crack propagation with XFEM, what's the suitable damage initiation criterion to use for this case?

Node rotation in UEL definition

Hi everyone,

I'm working on UEL and recently I've developed a shell element. To define an element in input file, I'm using counter-clockwise rotation for nodes. When it's just one element everything is good.

exponential softening cohesive zone (ABAQUS)

Hi everyone,

what is the exponential curve used in ABAQUS to model the softening (damage evolution) for cohesive interaction? Reading the documentation, I find the equation for D (damage variable) in linear and exponential cases. But the exponetial curve is not given there (maybe it is not given explicitly).




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