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abaqus repeated loading

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anyone please help to provide repeated load of 100kN for 5000 repeatitions. each time the load remains there for .3second. time gap between two load application is 1 second.

PREDICTION FOR DEFORMED PART WITH TIME

Dear ALL,

Does anyone here has an experience carry out  FE analysis for a part[bracket] which was deformed plastically during cyclic loading test.

I'm now working to resolve this issue when a bracket was fail to withstand the constant loading of 500N during cyclic test. It was reported fail at ~3800 cycles which was less than target.

Rgds.

Reservoir Modeler. Eclipse to Abaqus. Geomechanical Coupling

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Hello, Everybody, who is studing reservoir geomechanics,

Overestimated peak strength for cube compression. Abaqus/Explicit

Hi,

I have done compression test for concrete cube using Concrete damaged plasticity model. I assigned BC in Reference point which I coupled with a surf of the cube.

I have got stress-strain curve that looks nice, but Peak strength is 2-3 times higher than it should be.

Ia have uploaded pic of force-displacement.

Can anybody help me?

Thanks

ABAQUS: Thermal stresses in a rectangular composite plate

Trying to model a crossply square plate with a sinusoidal temperature loading (uniform along the thickness). I am trying to match the results by Kant et al 2008 and Rohwer et al 2001. I am modeling the compoosite as a 3-D solid elements (making a part and dividing into 4 layers). I always obtain transverse shear stress on the 90 degree layer at 0,b/2,z to be zero.  My results match with that of the paper when I have a single layer of orthotropic material but they dont match when I have 4 layers of equal thickness and an aspect ratio of 5 (length/thickness).

 

ABAQUS 6.14 CAE "pre.exe" error

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I am planning to analyze my Senior Design Project by statically on Abaqus, since I am just an undergraduate student, I am also planning to do this on my new laptop that have;

8+4 GB DDR3 800MHz RAM

Intel i7 4700HQ 3300 MHz Processor

nVidia GeForce GT 750M Graphics

I got Abaqus 6.14 from my school, I tried to make a simple example to test the program is running with no error, finally I have an error with this message;

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Abaqus contacting thin membrane

Hello everyone,

I'm a beginner in Abaqus. I must simulate effect of water stream on thin membrane contactin with ground. Which element type do you suggest? Can STRI65 be a good option?

Thanks in advance

Best

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Direct Dynamic Analysis Method (DDAM) of the US Navy... Not found in Abaqus 6.14!!

I worked with Direct Dynamic Analysis Method (DDAM) of the US Navy with Abaqus in 2007, but when I revisit it again in 6.14 version I didn't find it and it is not in the documentation also. Is it removed from Abaqus? and  why? In ship building industry, they use it heavily till now.

Please, find the attached file about the method from a Simulia document in 2007

Case Study: Mechanics of Bacterial Biofilms on Surgical Sutures

Biofilms represent bacterial communities that attach to implanted medical devices such as sutures and catheters. When detached from implants within the body, biofilms can cause chronic infections. This study used Simpleware software to generate image-based microscopic Finite Element (FE) models from confocal laser scanning microscopy scans of real biofilm colonies attached to a surgical suture fragment.

Concrete compression test - Error

Hello everyone, 

I have modeled compression test on concrete cube in Abaqus/Explicit. For concrete I have used Concrete damaged plasticity model. I have assigned displacement as BC (Smooth amplitude) in Reference Point at the top of the cube, and I have coupled RP with the top of the cube. For concrete cube I have used C3D8R elements. 

For history output I have requested Reaction force in RP and energies for whole model. 

But job won't finish. I get an error: 

Smeared Crack and Cohesive zone modeling of concrete in ABAQUS

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Can anybody help me in using smeared crack and cohesive zone modeling in concrete for different grades. I was actually facing problem in using the same to identify fracture parameters of concrete using ABAQUS. I will also be helpful if anyone let me know about an alternate method to find fracture parameters of concrete using ABAQUS apart from using models. Thanks in advance.......

Smeared Crack and Cohesive zone modeling of concrete in ABAQUS

Can anybody help me in using smeared crack and cohesive zone modeling in concrete for different grades. I was actually facing problem in using the same to identify fracture parameters of concrete using ABAQUS. I will also be helpful if anyone let me know about an alternate method to find fracture parameters of concrete using ABAQUS apart from using models. Thanks in advance.......

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How to export Abaqus .inp file into CAD file (sOlidworks)

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Hello guys,

I have a model in in .inp Abaqus format. I need to modify the model and amend it using Solidworks. Anyone have an idea on how to do that. I just figure out by export it into STL file. When I opened it using Solidworks, I only can view the model. I cannot event draw or make some amendment on the model. Anyone have the same exoerience. Thank you 

STRESS TRIAXIALITY

Dear ALL,

Which reading material/source that describes the good understanding of stress triaxiality?

What is the role of stress triaxiality for FE analyst?

I have read a lot of papers/articles but still have confusing me on the fundamental of stress triaxiality.

 

Constant cavity volume

Dear all,

I am trying to simulate cardiac contraction for a left ventricle. I want have to keep the cavity volume constant for my simulation.
I have read alot of documentations for tyre simulation in abaqus where they give a constant volume for internal air part but no success to find inp example to understand how you can give such boundary conditions.

Anyone can give me some hints where can I find such info?
Any help is very welcomed,

How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

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How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

hello engineers

i need help about concrete damaged plasticity

fo example :

if Compressive stress (Fu)= 51.2 MPa

and tension stress (σ t)=0.3 x 51.2^(2/3)=4.136

1)why (σ t) is 2.36 in picture(uploaded)?

2)what is tension strain ? and how? i cant understand.

i cant obtain εt = total tensile strain.

how obtain εcr ?

please help

 

Periodic boundary condition for RVE (Abaqus)

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Hi,

 

i have a problem with the periodic boundary conditions. I want to implement the boundary condition for example

which i found it in the internet. The first equotion is u_facebuttom - u_facetop=0

So i know that we can do this with creating Constraint and selecting Equotion.

Problem in Extracting Mass Matrix in Abaqus

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hello,

I am trying to extract mass and stifness matrices of a simple beam using abaqus. The stiffness matrix works fine but when i requested the mass matrix to be exctraced the section in the ASCII related to mass matrix is empty. here my script:

*HEADING

 

Fixed Beam

ELEMENT: B21

*NODE

how to calculate dispersion relation with ABAQUS ?

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  I wanna get the dispersion relation of acoustic crystals in ABAQUS, so far as I know, the frequencies can be obtained by applying different wave vectors in the IBZ, but I dont know how to opperate in ABAQUS, in what way can we simulate the wave vectors (or the cooresponding wave length) . By applying force or displacement, or acceleration ?

 Attacthed, should I model the whole structure or just the 1st BZ? If the 1st BZ is employed, should the periodic semmetric B.C. be considered in my model?

Any suggestion is appreciated! 

matlab code to create cohesive elements (or UMAT) in any 2D mesh

To use cohesive elements, normally user can add a layer of elements between neighbouring node pairs. This matlab code can help you to process that especially your FE mesh is irregular. The code, the initial .inp file and corresponding out put files are attached for a better illustration. The new generated cohesive elements won't cause any trouble in the element number. Also you can apply this code to generate new UMAT elements in mesh.

 

Opening for a Sr CFD/FEA Modeling Engineer at Medtronic

Here is the link:

http://bit.ly/1woJzOp

Requisition ID:95396

Experience with phase-chase modeling or FSI is a plus.  

Please feel free to forward this posting to potential candidates.  Thanks!

Open Pit Model Abaqus

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Hi guys, 

I'm new on iMechanica, well at least writing on it, I've been working on a project about geomechanics in order to get my mechanical engineer university degree. The thing is that I'm felling like I can't get all this stuff together, so I would like to ask some questions about my project (Abaqus model of an open pit mining scenario):

Inconsistencies in Abaqus material

Hello,

i wonder, how the inconsistencies in anisotropic hyperelastic material of Holzapfel-Gasser-Ogden form caused by Macauley-brackets and Heaviside step-function are beeing solved inside Abaqus (cf. Analysis User's Manual 22.5.3).

The Heaviside H(x) is beeing used to allow fiber reinforcement only on extension (in fiber direction). But analytical derivatives of the Macauley-bracket yield terms with H(x), and the Dirac-delta (infinite impulse at x_0).

Incompressibility in hyperelastic ABAQUS-Subroutine

Hello everybody,

in hyperelastic material models incompressibility is normally realised through Lagrange multipliers. But i can't find any instruction, whether i have to code that multiplier in a routine e.g. of type UHYPER, UANISOHYPER_INV or UANISOHYPER_STRAIN! The only instruction is on incompressibility (and hybrid element) flags, that have to be set, cf. Abaqus User Subroutines Reference Manual 1.1.20, 21 and 37.

 

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