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fatigue analysis with FEM

Dear all

I want to model 300000 cycles of loading with maximum and minimum value for force as a fatigue loading.I want to model this problem in abaqus and I have several idea for it but not sure about them.would you help me what to do?

many thanks 

Doing Topology Optimization Explicitly and Geometrically - A New Moving Morphable Components Based Framework

    Structural topology optimization, which aims at placing available material within a prescribed design domain appropriately in order to achieve optimized structural performances, has received considerable research attention since the pioneering work of Bendsoe and Kikuchi. Many approaches have been proposed for structural topology optimization and it now has been extended to a wide range of physical disciplines such as acoustics, electromagnetics and optics.

Fluid domain

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Tube domain

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"keyword *CO-SIMULATIONREGION is misplaced" Error

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i everyone,

I am UG student of Mechanical Engineering. I am a new user of Abaqus and currently working on co-simulation for my final year  project. Actually what I am doing is prediction of heat transfer due to fluid flow in a tube of known diameter across which air is flowing, also called as conjugate heat transfer.

I created model in Abaqus/standard named Tube, created part as Tube


Assigned material properties

Created step "Dynamic, temp-disp, Explicit"

D.Rittel's picture

Ultra high speed imaging of impact fracture

Here are some movies of impact fracture of various test cases, recorded at up to 5Mfps using the new Kirana camera. The sensor is not the final one yet, but the results are promising. Wedge loaded PMMA plates with holes reveal very nice crack branching (somewhat analogous to fireworks). My students Y. Rotbaum and A. Godinger who performed to test cases thought that Haendel "lascia chio pianga" is appropriate. I don't take a stance on that!

Enjoy:

 

https://www.youtube.com/watch?v=ERhvhWogysw 

ductile behaviour

I have done flat plate tensile test experiment with plate having u notch at different angle to get mixed mode behaviour.The experiment shows the force variation F(30 DEG)>F(45 DEG)>F(0 DEG)>F(60 DEG) While fem elasto-plastic model made in abaqus shows F(0 DEG)>F(30 DEG)>F(45 DEG)>F(60 DEG).

Can anyone tell me why this contradiction is there between experiment and fem model. 

Amit Acharya's picture

From dislocation motion to an additive velocity gradient decomposition, and some simple models of dislocation dynamics

Amit Acharya         Xiaohan Zhang

(In Ph. G. Ciarlet and Ta-Tsien Li, editors, Proceedings of the International Conference on Nonlinear and Multiscale Partial Differential Equations: Theory, Numerics and Applications held at Fudan University, Shanghai, September 16-20, 2013, in honor of Luc Tartar. Series in Contemporary Applied Mathematics. Higher Education Press (Beijing), and World Scientic (Singapore), 2014)

Arash_Yavari's picture

Non-Metricity and the Nonlinear Mechanics of Distributed Point Defects

We discuss the relevance of non-metricity in a metric-affine manifold (a manifold equipped with a connection and a metric) and the nonlinear mechanics of distributed point defects. We describe a geometric framework in which one can calculate analytically the residual stress field of nonlinear elastic solids with distributed point defects. In particular, we use Cartan's machinery of moving frames and construct the material manifold of a finite ball with a spherically-symmetric distribution of point defects.

Equivalent strain in large torsional deformation

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Dear All

Looking for a methodology to convert shear stress-shear strain data from a torsion test in large deformations into true strain-true stress curve, I found two schools of thought: 

 

and

 

Ting Zhu's picture

Journal Club Theme of May 2014: in situ Nanomechanics

The in situ nanomechanics is an emerging field that investigates the mechanical properties and deformation mechanisms of nanoscale and nanostructured materials, by integrating the real-time mechanical testing inside electron microscope and the mechanics modeling with atomic resolution. It provides a powerful approach to "visualize" the intrinsic nanomechanical behavior of materials - seeing is believing.

Ting Zhu's picture

Silicon lithiation

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Graphene fracture

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Multiscale Material Modelling

Computational modelling of materials behaviour
is becoming a reliable tool to underpin scientific investigations and to
complement traditional theoretical and experimental approaches. In cases where
an understanding of the dual nature of the structure of matter (continuous when
viewed at large length scales and discrete when viewed at smaller length scales) and
its interdependences are crucial, multiscale materials modelling (MMM)

Yield surface of a material model

Can anyone tell me which kind of numerical (finite element) simulations should be used to obtain the yield surface of a material model?

I am going to plot the yield surface of a constitutive model developed for polymers. If you can also introduce me references in which I can find how to determine, numerically, the yield surface of material model, I would be grateful. 

 

uniaxial compression test

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Modeling of of UD Composite rod under uni-axial compression using ANSYS

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element selection, material property assignment, similar examples would be of great help.

 

Thanks 

Fracture toughness of graphene

 

Fracture Toughness of Graphene

P. Zhang, L. Ma, F. Fan, C. Peng, P.E. Loya, Z. Liu, Y. Gong, J. Zhang, X. Zhang, P.M. Ajayan, T. Zhu, and J. Lou
Nature Communications, Vol. 5, article number 3782, 2014. DOI: 10.1038/ncomms4782

http://www.nature.com/ncomms/2014/140429/ncomms4782/full/ncomms4782.html

why the mass matrix of my structure is unsymmetric?

I'm doing an research about a cantilever which can undergoes large rotations along two directions. At the head of the cantilever there is a magnetic particle. When I establish the dynamic model for this cantilever, I just consider the mass of the particle(since the mass of the beam is small). However after I obtian the mass matrix (6 by 6, six DOFs), i found it is not symmetric. I don't know the reason. Can anyone help me? By the way, if the beam undergoes large rotation, will the stiffness matrix(tangent matrix) at each state keep symmetric ? Thank you   

Modeling of Particulate Composites

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Hi

I am trying to model particulate composites and simulate their stress-strain response. The problem that I am facing is that the inclusions (stiffer than the matrix) are only acting as points of stress concentration. Consequently their is no strengthening and hence no apparent increase in load carrying capacity of the composite. Any help/suggestioin in this regard would be higly appreciated.

Regards 

 

 

PYTHON SCRIPTS FOR ABAQUS :LEARN BY EXAMPLE

Hello, Please Do you have this full book:

PYTHON SCRIPTS FOR ABAQUS: LEARN BY EXAMPLE

Gautam Puri

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