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R. Hasanpour's picture

tunnel figure

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muhendismrt's picture

Positive definite stress-strain matrix in Ansys

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Dear friends,

 I'm an MSc. student at Bogazici University, Turkiye and I'm working on a thesis project about the failure behaviour of fiber reinforced laminated composite plates under different loading types. The material which we use are AS4 fiber reinforced  prepregs and their mechanical properties are the following:

 


E11 =134,000 MPa

E22 = E33= 9480 MPa

G12 = G13= 5490 MPa

Micro Modelling of Masonry Wall Panel in ABAQUS

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Hi All,

 I am doing research of micro modelling of masonry panel using ABAQUS. I try to model the interface using cohesive element in ABAQUS. I want to compare the result with the experimental research available.

Is there anyone here have done that or doing it right now. I have some difficulties to define the interaction between cohesive element and bricks. It is really difficult since I use abaqus standard, to define the surface one by one. Until today I also can not make my cohesive element geometry thickness to be zero.

Arash_Yavari's picture

Analysis of the Rate-Dependent Coupled Thermo-Mechanical Response of Shape Memory Alloy Bars and Wires in Tension

In this paper, the coupled thermo-mechanical response of shape memory alloy (SMA) bars and wires in tension is studied.It is shown that the accuracy of assuming adiabatic or isothermal conditions in the tensile response of SMA bars strongly depends on the size and the ambient condition in addition to the rate-dependency that has been known in the literature.

How to view random material properties in ABAQUS

In ABAQUS, I have 100*100 elements and the material properties of each element (say elasticity, angle of friction) varies. How can I view (plot) the mesh as per material properties value (say elasticity) (like colorbar)

Testing VUMAT With Uniaxial Compression Simulation

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S. Beretta's picture

Damage tolerance of railway axles

Failure of railway axles has been the problem which gave origin to the studies about 'fatigue'. The modern approach to the structural integrity of these safety components is to complement the traditional designwith a 'damage toleranc' analysis.

Chen Long's picture

how is the stress-strain field near the crack tip under cyclic loading?

hi!

i am interested in the fatigue crack growth of a cracked body.Recently,i am stucked by a problem of how is the stree-strain relationship near the crack tip  under cyclic loading.As we know,the HRR field near a crack tip under monotanic loading is well solved.So,i doublt that if the type of the HRR formulation can still be used under cyclic loading.If not,why?And how to solve this problem?if there is any suggestions or references ,i would be appreciated!

Fliiping nodes normal directions for a solid section

Does Anyhone have any idea about fliping the normal directions for a solid sections to be pointed in not out, because am having an error: nodes have incorrect normal definitions.

Amit Acharya's picture

On the three-dimensional Filon construct for dislocations

 
(to appear in the Intl. Journal of Engineering Science)

 Robin J. Knops and Amit Acharya

 The relationship between dislocation theory and the difference of linear elastic solutions for two different sets of elastic moduli, derived by Filon in two-dimensions, is generalised to three-dimensions. Essential features are developed and illustrated by the  examples of the edge and screw dislocations. The inhomogeneity  problem is  discussed within the same context and related to Somigliana dislocations, and  in the limit  to the interstitial atom.

Delamination and Cohesive zone model

 

I want to work on delamination and cohesive zone model. I would also like to model this in Abaqus. I’ve read the material available there but it’s not adequate. I would like to know the concepts and fundamentals of the cohesive zone model and its implementation. Can anyone explain this? Please suggest some good literature/books on this for beginners.

Praveen.

 

ABAQUS Fully-coupled Thermal Analysis / ABAQUS Explicit

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Hi everyone,

 

I am new to ABAQUS. I am working on a research topic where I need to study the temperature increase arised due to strains applied to a body. From the user's manual I understood that I need to use "Sequentially Coupled Thermal-Stress Analysis" for my model.

Crack Initiation with UMAT

Dear all,

      I want to model crack initiation and propagation for a user defined material, using Abaqus. When I try to model , I get the following error:

A MATERIAL PROPERTY THAT IS NOT ALLOWED WITH A USER MATERIAL HAS BEEN SPECIFIED

when I take out critical damage initiation, the model works fine; which means that it doesnt allow me to couple UMAT with crack initiation. Does anyone know how to handle this problem?

All the best,

         Panos

 

firozahmed49's picture

how to apply a torsional moment to shell made up of composite in ANSYS

HI,
I am performing a non linear buckling analysis in ansys using shell 181 element. My geometry is made up of composite material and has a shell structure. The shell is subjected to torsion at one end so as to buckle throughout it length. the other end is fully constraint.
My problem is how to apply this torsional moment at the free end.
anybody please help me.

Stress Field near a crack tip with different crack fibre orientations of an orthotropic lamina

I was going through these papers:

1.P.K. Sarkar and S.K. Maiti, 'Prediction of mode-1 fracture toughness of unidirectional fibre composites with arbitrary crack fibre orientation from its lowest or matrix fracture toughness'. int. J. Fracture, vol. 40. pp. R91-R96, (1989).

 

2.S.K. Maiti and P.K. Sarkar, 'A method of calculation of total strain energy release rate and its layer-wise distribution for an arbitrary through the thickness crack extension in a composite laminate', Engg. Fracture Mechanics, vol. 36, pp. 639-646,(1990).

 

 

Fatigue Analysis on ANSYS 11.0

I am currently having difficulty modelling fatigue analysis on a wheelchair frame with hollow circular sections (pipe 16). When assigning the stress locations it says that the stress is not available for that node. 

Any help would be appreciated!

Ph.D. in seismology and geodynamics at ETH Zurich

The institute of Geophysics of ETH Zurich is seeking a highly motivated Ph.D. candidate to be working in the domain of seismic imaging of the Earth's interior. Global seismic tomography is a relatively young discipline that rose to prominence in the 1980s and

Finalists for the 2011 Melosh Competition Announced

Six finalists have been announced for the Twenty-Third Annual Robert J. Melosh Competition for the Best Student Paper in Finite Element Analysis. The finalists and their current institutions are:

Bircan Avci, Leibniz University

Andrea Hawkins-Daarud, University of Texas at Austin

Daniel Hurtado, California Institute of Technology

Sezgin Kucukcoban, University of Texas at Austin

Michael Scott, University of Texas at Austin

Amin Aghaei's picture

Symmetry-Adapted Non-Equilibrium Molecular Dynamics of Chiral Carbon Nanotubes under Tensile Loading

Here is the paper "Symmetry-Adapted Non-Equilibrium Molecular Dynamics of Chiral Carbon Nanotubes under Tensile Loading"

 Amin Aghaei, Kaushik Dayal

Civil and Environmental Engineering, Carnegie Mellon University

A short-beam shear fracture approach to measure the mode II fracture toughness of materials with preferred interfaces

Increasing complexity of numerical simulations has made it important to obtain reliable experimental data for a variety of mechanical properties. Fracture properties are complex to measure but accurate data is often desirable for several challenging problems. We have developed a novel short-beam shear fracture approach in order to measure the mode-II fracture toughness properties of materials with 'preferred' interfaces.

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