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Chris Yakacki's picture

Journal Club: Overcoming Challenges in Mechanically Actuating Liquid-Crystalline Elastomers

Smart materials are designed to have a controlled response to external stimuli. Shape-memory polymers (SMPs) are one of the most well known classes of mechanically active smart materials and have experienced an incredible amount of research attention over the last decade. They are able to recover programmed deformations when heated above a thermal transition; however, are generally considered a one-time event. Liquid-crystalline elastomers (LCEs) are another class of actively moving polymers; however, these materials can demonstrate reversible and repeatable shape memory without the need for “re-programming” after each actuation cycle.

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Transverse stresses in Reissner Mindlin theory

How is it possible to obtain the transverse stresses correctly, not constant, by Reissner Mindlin theory?

Equilibrium equation would be the first solution, but, once the second derivatives of bilinear shape functions are zero, no results is appeared.

 

Thanks in advance for any help!

writing UHARD subroutine in ABAQUS - power law hardening

Hello All,

I am required to incorporate the simplest form of constitutive law - elasto-plastic material with power law isotropic hardening in ABAQUS. 

Does any one know where to look for tutorials on writing UHARD in ABAQUS?

Any help would be appreciated.

Thanks,

Jay Patel

Rouzbeh1's picture

Two Post Doctoral Positions in Advanced Synthesis and Characterization at Rice University

Position Description: Two postdoctoral associate positions in the area of advanced synthesis and nano/micro-scale characterization of nanoparticles are available at Rice University. Various techniques will be applied to synthesize and self-assemble size- and shape-controlled silicate nanoparticles followed by nano- and micro-characterizations including a myriad of probes such as electron microscopies (TEM, XRD, SEM, AFM), ICP, XPS, NMR, porosimetry, dynamic mechanical analysis, nanoindentation, etc.

Virtual Special Issue: 'Outstanding research contributions in the area of nonlinear continuum and computational mechanics'

The 2014 Nathan M. Newmark Medal was awarded to Professor Herbert A. Mang at the annual ASCE Structures Conference, which took place in Boston, April 3–5, 2014. Professor Mang was awarded the Newmark Medal for his outstanding research contributions in the area of nonlinear continuum and computational mechanics that clarified the cause of collapse of important concrete structures and quantified the influence of the initial post buckling behavior of metallic structures.  

 

Elena Benvenuti's picture

X-DMS Conference

Giulio Ventura and me are organizing the conference

X–DMS 2015:  eXtended Discretization MethodS

 

XFEM, GFEM, Non Conforming, Patches and nonstandard finite elements

9 – 11 September, 2015 – Ferrara, Italy

rejithpaul's picture

Aeroelasticity-Agard wing 445.6

Hi ,

       Presently iam doing M.Tech project in aeroelasticity.I am in need of Agard 445.6 wing geometry file for modal analysis.If anyone have the file or link location ,please post it or send via mail rejithaero@gmail.com.

 

 

Thanks in Advance.

Michael Sangid's picture

Post-doctoral Position in Microstructure-Sensitive Modeling or In Situ Experiments at Purdue University

The Adv. Computational Materials and Experimental Evaluation laboratory at Purdue University’s School of Aerospace Engineering invites applications from highly motivated individuals for a postdoctoral position. This position is supported by a 2 year sponsored project from DARPA that seeks to advance the development of time dependent behavior of aerospace alloys.

 

High temperature material behavior in Abaqus

Hi

I need to simulate high temperature behavior of a metal in Abaqus. I have J-C parameters (A,B,C, n,m, epsilon_dot, melt temp, transition temp). Where to specify the test temperature in Abaqus ?

Thanks

 

modeling crack surface friction in abaqus

Hi every one,

I need to consider friction in crack surface and observe its effect on my answer. I want to do it in abaqus. how can I model friction in that surface, because I can identify interaction just for external surface. I am so grateful.

thanks

atefe.geramian's picture

The UMAT problem with no strain and stress

Hello,

I have written a UMAT subroutin. When I run, the job completes succssefully. But when I try to see results from the ODB files, I get the following error:

"The selected primary variable is not available in the current frame for any elements in the current display group"

I have tried to select the stress, strain and magnitude and all not available. Could anybody help me?

Thanks in advance for your help.

Best regards,

viscoelastic material using Ansys for Dynamic modeling

Hello,

 

I am planing to model a viscolestic material in ANSYS and condition is dynamic.

i have the data of stress relaxation data from experimental Could anyone please suggest how to give material input in ansys taking the data of stress relaxation

weather for dynamic modeling of viscoelastic material in ansys, we should go for curve fitting or prony series

 

 

 

Thanks for your kind help

PhD Scholarship & Research Fellow at RMIT: Mechanics of Composite Structures, Micro-/nano Mechanics

Full scholarship (stipend+tuition fee waiver) for 3 PhD students and a fulltime Research Fellow (Level B) position are now available at School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Australia. These positions are fully funded by Australian Reserach Council (ARC). The successful applicants will join our research team to work on an ARC Discovery Project and an ARC Linkage Project in one of the following areas:

(1) mechanics of composite/nanocomposite structures;

Erkan Oterkus's picture

First Book on Peridynamics is Available

                                                         Peridynamic Theory and Its Applications

                                                                                       by

                                                              Erdogan Madenci & Erkan Oterkus

 

Post-Doctoral Position in Computational Mechanics

Post-doctoral position at the University of Valenciennes (LAMIH UMR CNRS 8201) for the modeling of the strength of spot-welded assemblies.
See attached file.

Allowable Stress Amplitude in ASME BPVC Code Section VIII Div. 2

Hi everyone:

If running a cycle fatigue analysis of a thick-walled vessel at hydrastatic shell pressure, should the Von-Misses peak stress be used as the Stress Amplitude that is depicted in ASME BPVC Code Section VIII Div 2? Is the stress ration R= -1? with the peak stress used as alternation stress amplitude or should the von-Misses peak be halved in order to get Sa?

 

Any comments will be appreciated.

 

Dibakar Datta's picture

FREE Registration : School on Molecular Dynamics for Biomolecules and Nanomaterials

 

Dr. Axel Kohlmeyer , one of the LAMMPS code developers, is organizing FREE School on Molecular Dynamics for Biomolecules and Nanomaterials at Temple University, Philadelphia (August 18th - 22nd, 2014)

 Detail Schedule is Available Here 

how can enter the effect of friction in crack surface in abaqus

Hi everyone,

I want to model friction in crack surface and investigate the effect of it in my modeling. I want to do it in abaqus.

thanks.

 

Imperfection in a Riks Analysis (ABAQUS)

I am performing a nonlinear post buckling using Riks method. I went through different tutorials for the same. I happen to see that an *IMPERFECTION is introduced while performing the non linear buckling analysis.Why is it done? How does/will the model react differently if the Imperfection is no introduced?

I wish to plot the graph of load v/s displacement for 1,2,3,4...10 times the critical buckling load during the post buckling analysis (Riks method). How do I do that?

modeling analysis of microstructure phase transformation in an alloy

Hi every one,

I need to modeling a thermal analysis of a microstructure of steel or other alloy by FEM or XFEM. so i need some metallurgical data for phase transformation.for example at which temperature or time martensit converts to austenit or etc. I also need how I can model this microstructure in abaqus that has change in boundries due to phase transformation. i appreciate if someone help me.

thanks

chenlei07's picture

Coupling GSM/ALE with ES-FEM-T3 for fluid-deformable structure interactions

In light of the effectiveness of the edge-based smoothed finite element method (ES-FEM-T3) and arbitrary Lagrangian-Eulerian gradient smoothing method (GSM/ALE) in, respectively, solving the pure solid and fluid flow problems using three-node triangular elements, they are coupled together in the present study to solve the more challenging fluid-deformable structure interaction (FSI) problems based on the weak coupling algorithm.

Research Associate in Dislocation Modelling (Fixed-term for 48 months)

Modelling of Dislocation-Microstructure Interaction at a Short Crack Tip

This project aims to model dislocation-microstructure interaction at a crack tip and associated short crack growth for nickel alloys.

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