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WaiChing Sun's picture

Journal Club Theme of September 2014: Numerical modeling of thermo-hydro-mechanical coupling processes in porous media

Thermo-hydro-mechanics (THM) is a branch of mechanics aimed to predict how deformable porous media behave, while heat transfer and fluid transport simultaneously occur in the pores filled by liquid and/or gas. Understanding these multi-physical responses is important for a wide spectrum of modern engineering applications, such as tissue scaffolding, geothermal heating, mineral exploration and mining, hydraulic fracture, energy piles, tunneling with frozen soil and nuclear waste storage and management.

Leon Mishnaevsky's picture

Hybrid and hierarchical nanoreinforced polymer composites

Hybrid and hierarchical polymer composites represent a promising group of materials for engineering applications. In this paper, computational studies of the strength and damage resistance of hybrid and hierarchical composites are reviewed. The reserves of the composite improvement are explored by using computational micromechanical models. It is shown that while glass/carbon fibers hybrid composites

Leon Mishnaevsky's picture

Graphene reinforced polymer composites: 3D micromechanical modelling, damage and fracture

3D computational model of graphene reinforced polymer composites is developed and applied to the analysis of damage and fracture mechanisms in the composites. The graphene/polymer interface properties are determined using the inverse modeling approach. The effect of composite structure, in particular, of the aspect ratio, shape, clustering, orientation and volume fraction of graphene platelets on the
mechanical behavior and damage mechanisms of nanocomposites are studied in computational experiments.

Sutured tendon repair; a multi-scale finite element model.

We've recently published an open access journal paper that looks at the mechanics of sutures used to repair severed tendons. A homogenization strategy is used to derive effective elastic properties for tendon fibrils and intracellular matrix. We have found that regions of high stress correlate with the regions of cell death (necrosis) that are sometimes observed in patients.

If this is of interest, please feel free to view the paper here.

 

 

davie's picture

a titanium ring Cartier watches

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User subroutine for Calculix explicit

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Hello,

I want to use Calculix explicit for large deformation problem. I want to use a user subroutine similar to vuhard (in ABAQUS) to model the material behaviour. Calculix documentation metions uhardening, but there is nothing similiar to vuhard.

Is there a way to do this?

Hamid Torabi's picture

Micromechanics of collective buckling in CNT turfs

Complex structures consisting of intertwined, nominally vertical carbon nanotubes (CNTs) are called turfs. Under uniform compression experiments, CNT turfs exhibit irreversible collective buckling of a layer preceded by reorientation of CNT segments. Experimentally observed independence of the buckling stress and the buckling wavelength on the turf width suggests the existence of an intrinsic material length.

s.faraji's picture

Radial of support domain in SPH

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 Hi all.I test the proficiency of SPH method dealing with a benchmark numerical example solving Poisson's equation; SPH  shows the good efficiency in modeling the contours, but the value of re

s.faraji's picture

Radial of support domain in SPH

I test the proficiency of SPH method dealing with a benchmark numerical example solving Poisson's equation; SPH  shows the good efficiency in modeling the contours, but the value of results change for a di

shahram's picture

how can I deal with the thickness strain in the Shell elements (S4R) writing a VUMAT subroutine ?

Hey buddies

 

I am writing a constitutive relation in vumat for plane stress conditions with S4R elemet in the ABAQUS.

the problem is that the E33 is reported as zero where it is not zero and also the values for S11 and S22 are so large numbers. 

ihave tried the code for 3D conditions and it work great with C3D8R element and the results are satisfactory where for the Shell elements by enforcing the S33=0, the E33 gets zero too.

does anybody have any solution? 

 

thanks alot

Bin Liu's picture

The theoretical ultimate magnetoelectric coefficients of magnetoelectric composites by optimization design

This paper investigates what is the largest magnetoelectric (ME) coefficient of ME composites, and how to realize it. From the standpoint of energy conservation, a theoretical analysis is carried out on an imaginary lever structure consisting of a magnetostrictive phase, a piezoelectric phase, and a rigid lever. This structure is a generalization of various composite layouts for optimization on ME effect.

Research Position Available in System Modeling and Control

Research Position Available in System Modeling and Control

Research Position Available in Structural Joints Simulation

Research Position Available in Structual Joints Simualtion

Research Position Available in Engine Simulation

 

Research Position Available in Engine Simulation

 

Crack Propagation in Bamboo's Hierarchical Cellular Structure

Bamboo, as a natural hierarchical cellular material, exhibits remarkable mechanical properties including excellent flexibility and fracture toughness. As far as bamboo as a functionally graded bio-composite is concerned, the interactions of different constituents (bamboo fibers; parenchyma cells; and vessels.) alongside their corresponding interfacial areas with a developed crack should be of high significance.

How to mesh , a solid/ shell hemisphere , hexdominant either by sweep or mapped meshing in ANSYS APDL ?

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Can anyone guide me how to mesh solid and shell 3d hemisphere with hex dominant approach in ansys mechanical APDL?

I found no such verification manual for 3d hemispherical meshing in ansys. What method should be applied and what element should be chosen appropriately to mesh this structure?

I have attached screen shot for your understanding of my problem.

Your response will be highly appreciated.

FSW in ANSYS

Hello ANSYS masters, I am student of M.Tech and I am currently doing my dissertation on Friction stir welding stimulation using ANSYS Mechnical APDL. The problem I face is in defining the time substep in the load step defined as follows

!Load Step2
time,6.5              
d,1,rotz,nr1             !Rotation of tool, 60rpm
deltim,0.01,0.001,0.2    
outres,all,10
allsel
solve

Cohesive Zone modelling

Dear all,

           I am trying to study the fracture at bonded interfaces using cohesive zone model in Abaqus. I am going through the abaqus manual but it was not clear how to insert the chosive elements in the model. How to model these chosive elements. Can anyone help in modelling the chosive elements.   

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