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Concrete beam with piezoelectric sensors in ABAQUS

Submitted by ozguryapar on
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ABAQUS
piezoelectricity

 

Hello,

 

I am trying to model piezoelectric sensors on a concrete beam in ABAQUS. Since I am using brttile cracking model, I have to use ABAQUS / Explicit. But piezoelectric elements are not available in ABAQUS / Explicit.

In some papers I saw that the piezoelectricity modeling problem in ABAQUS / Explicit is solved by replacing it by an equivalent Thermo-Mechanical problem. Does anybody know how to accomplish this?

Do you have any suggestions? Are there any other ways to model piezoelectricity in ABAQUS / Explicit?

How to update the stress in umat when the load is constant?

Submitted by yoyo Li on
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My friends 

I'm working on a constitutive model using umat in abaqus. There is a problem and can be described generally as follow:

A constant load is applied on beam elements, however, the elastic modulus decreases as a function of the axial strain of the element and loading time. In another words, the modulus will decrease when the umat is called at DTIME. I used STRESS=STRESS+DDSDDE*DSTRAN to update the stress, however, the result shows that the STRESS, STRAIN and DISPLACEMENT don't change since beginning.

Wavelengths of surface features

Submitted by r.nikhil on
research
Roughness
wavelengths

I am working on the surface features of steel . I understand that surface features are broken down into various wavelengths and represented as Wa to We (0.1mm to 30mm wavelengths). Could some guide me to a reference which shows how to go about this process from the raw surface profile data ? Possibly, it involves Fourier Transforms, but I need a basic reference which shows how it is done .

 

Thanks!

 

A paper on ILS : Inequality level set : A new approach to handle inequality constraints

Submitted by Nicolas MOES on
research
X-FEM
contact
level set
inequality constraint

Treating volumetric inequality constraint in a continuum media with a coupled X-FEM/Level-Set strategy

N. Bonfils, N. Chevaugeon, N. Moës

(accepted for publication in computer Methods in applied mechanics and engineering).

dewatering during excavation

Submitted by samson on
research

when I model excavation with low permeablity soil problem is not converging,due to the negligible vaule of excess pore pressure throught the soil.How can I resove this problem for the real excavation time .(If I run the analysis within very short period of time , results can be obtained under undrained ccondition)



how can I model dewatering during excavation using ABAQUS

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