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wazy's picture

Abaquas Error for stress intensity factor calculation

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Dear All,

I am performing stress analysis using Abaqus. The model consists of 3 parts; cracked-metal plate and composites.

3D solid-element utilized for modeling the three parts. The three parts constrained by tie-element. However, the following error came, and would be so appreciated if you have any suggestions or advice to overcome this error.

'Elastic material along the crack front must be of the same type for K calculation'

Best

Simpleware 2016.09 Webinar, Sep 20th and 21st 2016

Tuesday, September 20, 2016: 5:00 PM UK (USA: 9:00 AM PDT, 12:00 PM EDT)

Wednesday, September 21, 2016: 8:00 AM UK (Europe: 9:00 AM - Tokyo: 4:00 PM - Sydney: 5:00 PM)

Borad M Barkachary's picture

Is there any way to assign element based surface for 2D shell element??

I am trying to simulate 2D metal cutting simulation using surface to surface contact in dynamic explicit model. But what I am seeing is.. there is no contact between workpiece surface with failed element (i.e. Chips) which reduces the force value during simulation.

In 3D simulation for 3D stress element (C3D8R), I can do element based surface by editing the input file. Is there any such way in 2D shell element (say CPE4R) also? Please help

JeremyCeak's picture

A treasury of knowledge

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Simpleware Version 2016.09 Now Available

We are happy to bring you the latest version of Simpleware – the 2016.09 release adds a number of new features to the previous version of the software and offers many improvements for users, with applications ranging from medical image processing to materials and industrial analysis.

JeremyCeak's picture

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JeremyCeak's picture

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Simpleware Automotive Workshop, Dearborn, MI, Sep 13 2016

Date / Time: Tuesday, September 13, 2016 / 9:30 am - 12:30 pm

Location: Ford Conference & Event Center, Dearborn, MI

Fee: Free-to-attend. Pre-registration is required as places are limited

Register herehttp://simpleware.com/news-and-events/events/workshops/workshop-dearborn.html

Who should attend

Simpleware Materials Workshop, MTC Coventry, Sep 9 2016

Date / Time: Friday, September 9, 2016 / 9:30 am - 12:30 pm

Location: The MTC, Ansty Park, Coventry, UK

Fee: Free-to-attend. Pre-registration is required as places are limited

Register here

Who should attend

likask's picture

Modern and open finite element code

Hello, 

MoFEM is open and free finite element code. See short video showing how easy you can install code form scratch https://youtu.be/6opfKER7JHA. MoFEM web page is avaliable here http://mofem.eng.gla.ac.uk. If you are intersted in contribute to MoFEM code or simply use it let us know. Feel free to aks any question.

Negative Eigenvalues due to Mesh Refinement

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I will keep my post brief to begin with.

 

The model consists of 7 rectangular interference fits (with 2 of the surfaces in direct interference).  The model appears to be working perfectly fine at simulating the stresses induced due to the fits for a variety of mesh sizes.  Once the mesh sizing of the slave components is reduced to below 0.4 the job fails due to experiencing negative eigenvalues.

 

To summarize - how can mesh refinement cause cause failure in a working model?

ABAQUS concrete beam

Hi everyone 

is there any method to model the reinforcment as steel fibers inside beam element?

numerical modeling using abaqus 6.14

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What is static riks solver?? Please explain in details.. As I am a learner of abaqus I get problem understanding some things, like arc length,  increment in static riks etc.. I find that it is very useful for simulating collaps behaiour.. I wish to do a thrust experiment regarding geological setup... Please help and guide me.. 

 

Thank you 

numerical modeling using abaqus 6.14

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<p>What is static riks solver?? Please explain in details.. As I am a learner of abaqus I get problem understanding some things, like arc length, &nbsp;increment in static riks etc.. I find that it is very useful for simulating collaps behaiour.. I wish to do a thrust experiment regarding geological setup... Please help and guide me..&nbsp;</p>
<p>&nbsp;</p>
<p>Thank you&nbsp;</p>

numerical modeling using abaqus 6.14

Choose a channel featured in the header of iMechanica: 

<p>What is static riks solver?? Please explain in details.. As I am a learner of abaqus I get problem understanding some things, like arc length, &nbsp;increment in static riks etc.. I find that it is very useful for simulating collaps behaiour.. I wish to do a thrust experiment regarding geological setup... Please help and guide me..&nbsp;</p>
<p>&nbsp;</p>
<p>Thank you&nbsp;</p>

numerical modelling using Abaqus 6.14

<p>What is static riks solver?? Please explain in details.. As I am a learner of abaqus I get problem understanding some things, like arc length, &nbsp;increment in static riks etc.. I find that it is very useful for simulating collaps behaiour.. I wish to do a thrust experiment regarding geological setup... Please help and guide me..&nbsp;</p>
<p>Thank you&nbsp;</p>

Modeling finite number of mass/stiffness systems on an elastic media

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Hello, 
I have to model finite number of springs with point masses on a soil layer in Abaqus representing resonators. I tried to use Reference Points on the soil layer and some Reference point above the layer and connect them with Spring/Dashpots using connecting two nodes option, I chose Line of action for the spring, then I add stiffness. In the next step I applied Point mass as inertia to the reference points above the soil. 

How to call UEXTERNALDB subroutine

Hi, I'm new user of ABAQUS. I'm trying to develop a model that involve one further output variable (the degree of cure of a polymer). I thought to use the subroutine UEXTERNALDB to write and read from an external file the array containing the values of this output variable in each element. But I couldn’t find out how to call this subroutine in the .inp file. Does anyone have any suggestion for my problem?

Thank you

Cant solve "too many attempts made for this increment"-issue on some models

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Hello at all,

 

I have some serious issues with some of my models in Abaqus 6.14. I need to simulate shear failure to investigate the influence of concrete strength and fracture energy on the size effect. So far, everything went good. I calculated almost 100 models without any problem with exactly the same model (only materials changed). But: For the combination of concrete strength fck=50MPa and a fracture energy of Gf=60N/m or Gf=80N/m, the calculations will stop after a short time although the .odb file shows only some minor bending cracks in the beam

Simpleware Intro & Live Demo - Materials Characterisation and Reverse Engineering, Rotherham, UK, June 27

Date: Monday, June 27, 2016

Time: 12:00 pm - 2:00 pm

Location: AMP Technology Centre, Advanced Manufacturing Park, Brunel Way, Rotherham, UK 

Who should attend

Abaqus Python creating a surface set in a loop

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Dear friends

I'm modelling a large penetration of a strip footing in clay soil. I'm using a Python script (Abaqus 6.13) for this.

Is it possible to solve buckling in Abaqus with only residual stress defined as predefined load?

Hi Sirs,

As title, I wondering if the problem can be solved with only material residual stress but no other external load applied?

After several trials, Abaqus returns message
"MASS OR DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED. IN A *BUCKLE ANALYSIS THE MOST LIKELY CAUSE IS THAT A NONZERO LOADING PATTERN WAS NOT SPECIFIED VIA *BOUNDARY, *CLOAD, *DLOAD, ETC,. SEE Eigenvalue Buckling Prediction IN THE ABAQUS/STANDARD USERS MANUAL"

Simpleware UK Workshops, June 27-June 29 2016

Simpleware software

 

We're running a series of free workshops at the AMP Technology Centre in Rotherham (June 27th), the University of Liverpool (June 28th) and the University of Leeds (June 29th) this month, where we'll be explaining the benefits of Simpleware for working with 3D image data.

vacary's picture

Siconos 4.0.0 is out !!

Dear Colleagues,

A brand new Siconos 4.0.0 is out !! Siconos is now distributed under Apache 2.0 license.

What is Siconos ?

Siconos is an open-source scientific software primarily targeted at modeling and simulating nonsmooth dynamical systems in C++ and in Python:

 + Mechanical systems (rigid or solid) with unilateral contact and Coulomb friction and impact (nonsmooth mechanics, contact dynamics, multibody systems dynamics or granular materials).

UMAT for MAZAR's Concrete Damage Model

Hello All,

I am working on stochastic upscalling of damage in concrete microstructure. Can someone provide a UMAT for Mazar's damage model or any resource to help me create UMAT on my own.

Thank you.

 

Vasav Dubey

Texas A&M University

Texas, USA

 

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