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Simulation-based numerical optimization of arc welding process for reduced distortion in welded structures

Submitted by Mohammad Refat… on
research
Finite Element Method
simulation and modelling
welding
design optimization
Genetic Algorithm

This paper presents an effective numerical approach for welding process
parameter optimization to minimize weld-induced distortion in
structures. A numerical optimization framework based on coupled Genetic
Algorithm (GA) and Finite Element Analysis (FEA) is developed and
implemented for a low and a high fidelity model. Classical weakly
coupled thermo-mechanical analysis with thermo-elasto-plastic
assumptions is carried out for distortion prediction of numerical
models. The search for optimum process parameters is executed by direct
integration of numerical models and GA-based optimization technique. The
developed framework automatically inserts the process parameters into
the simulation models, executes the FE-based welding simulations and

Will structural disorder in amorphous material change under mechanical loading?

Submitted by Aman Haque on
research
amorphous materials
structural order

I would appreciate your comments or pointing to something in the literature on whether mechanical loading changes the magnitude of structural disorder (may be rdf could be a measure) in amorphous materials. Does tension increase 'amorphous-ness' and is the opposite true for compression? Since the network structure is random, should tension and compression yield the same effect (if any)? 

I am assuming elastic loading/unloading only. 

 Many thanks!!

Aman Haque 

Modeling associative Tresca plasticity in ABAQUS?

Submitted by mmd110 on
research
Plasticity
ABAQUS
tresca

Hi

I have a simple question. How could I model associative Tresca plasticity in ABAQUS?

 I use Property module: material editor: Mechanical:Plasticity:Mohr Coulomb Plasticity

I know that In the case (friction angle=0) of  the Mohr-Coulomb model reduces to the pressure-independent Tresca model with a perfectly hexagonal deviatoric section. 

How to calculate total load in a displacement control analysis in abaqus

Submitted by hrkhalid on
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concrete damage plasticity
FRP debonding modeling
displacement control model

Hi,

I'm modeling a pull-out test for FRP debonding. I,m using displacement control and used amplitude to define displacement control boundary condition for example

amp*

0,0

0.15,1.0

 

I used concrete damage plasticity model to define tensile damage of concrete and done abaqus explicit analysis with time period same as for amplitud,  i.e.,0.15

huge difference of Young's modulus in sandwich structure

Submitted by Han Shiwei on
research
FEM
sandwich strcuture

I am modeling a plate under three point bending with Abaqus. The plate
is a sandwich structure with aluminum plate (thickness: 5mm), adhesive glue (thickness:
0.02mm) and a kind of foam (thickness: 15mm) bonding together. Their Young’s
modulus is at the order of 100GPa, 1MPa and 100MPa. While in incremental
calculation, the job is always be aborted for not achieving convergence. I just
wonder whether the cause of not achieving convergence should be attributed to
the huge difference in Young’s modulus.

 

Effect of vacancy defects on generalized stacking fault energy of fcc metals

Submitted by mohsenzaeem on
research

http://iopscience.iop.org/0953-8984/26/11/115404/

Molecular dynamics (MD) and density functional theory (DFT) studies were performed to investigate the influence of vacancy defects on generalized stacking fault (GSF) energy of fcc metals.

Element Weakening Method (EWM) in ABAQUS 6.12/6.13

Submitted by pateljay26 on
research

Hello All,

Currently,I am modeling elasto-plastic buckling of laminated composites. I started with 3 layers (fiber-matrix-fiber) respresenting unit cell of composite. The model is made with material non linearity and incremental approach - Modified Riks Algorithm has been used for buckling analysis. My try would be to get plastic buckling in the model. For this I need to introduce "Element Weakening Method" (EWM) which allows user's choice to assign weak properties or reduced stiffness to the selected elements. Consequently, this helps in propagating damage.

Greeting

Submitted by AminBakhtiari on
research
nanofluids

Greetings my dear friends!

I'm Amin and its my first post!I'm studying mechanical Engineering in Semnan University in Iran and by the time  I'm workin' on entropy generation calculation for laminar and terbulent
fully developed forced flow and heat transfer of nanofluids inside
annul.I'd be really glad if anyone could give me hand with it .

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