How do you use multiple user subroutines in Abaqus?

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What is the difference between writing UMAT and VUMAT for shell elements? And what points must be considered in writing user mats for shell elements?

Hi all researchers I'm writing user material for shell elements. For writing VUMAT abaqus says that I must write constitutive equation for plane stress condition and I must define thickness strain...

04 May 2015 7,814 2 View

How to define a strain rate dependent pressure amplitude in Abaqus?

Hi all docs and engineersI'm modeling inflation of a polymer sheet under a constant pressure load. i wrote UMAT for viscoelastic behavior of the polymeric sheet. My constitutive equation holds for...

02 March 2015 2,275 4 View

In UAMP subroutine how can I specify props in abaqus CAE?

Hi researchers In UAMP there are props variables like UMAT subroutine but i don't know how to specify constants in abaqus cae like UMAT. in UMAT you specify props in property module but where...

01 February 2015 5,743 6 View

How can I define strain rate dependent parameters in UMAT for shell element?

Hi friends I'm writing a user subroutine for a viscoelastic material and material parameters are depend on shear strain rate. I use DSTRAN(3)/DTIME to relate parameters to the shear strain rate in...

01 February 2015 4,218 2 View

How do you model the inflation of a polymeric sheet under a constant pressure (Thermoforming)?

Hi friends I'm trying to model inflation of a rectangular sheet in abaqus for thermoforming process (Free forming). Material behavior is viscoelastic and I wrote a user subroutine for it. My...

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error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

Zol Bahri Razali

Dear friend

The easiest way is searching the related document by typing the keywords into google scholar. You will find some related articles.

If yet to find the articles, do not hasitate to let me know. I will help you in detail.

Good luck. Dr Zol Bahri - Universiti Malaysia Perlis

Mojtaba Khaleghi

Thanks Doctor

I searched the web and forums but i couldn't find anything perhaps because i don't know how to find information about these things. could you please help me?

OK. InsyAllah I will do that soon

Thanks Daniel

I wrote my user subroutine in a single file with ".for" extension. first i wrote my codes for UMAT in the UMAT interface and then i wrote UAMP codes in the UAMP interface after UMAT. Did you mean that?

Stephane Panier

As explained by Daniel, you have to write all your subroutines UMAT and UAMP in one file with .for or .f extension depending of your OS (windows or linux).

Best regards

Stephane

Hi doctor panier and thanks for your answer

I wrote all subroutines in one file but my problem is with UAMP i need to specify props for UAMP in the abaqus like UMAT but i don't know how to do this. in UMAT you specify props in the property module but where should i specify props for UAMP in the abaqus?

Abhishek Kumar

PROPS for UAMP should be entered in inp file or from UAMP itself. Unlike UMAT I guess you can't enter them directly through Abaqus CAE.

Matteo Selmi

Hi everyone,

I'm writing here since I found the topic of this discussion nearly matching the problem which I'm facing with. I wrote two different subroutines (a VUMAT and a VUANISOHYPER-STRAIN) and I'm wondering if it is possible to include them in the same simulation. Calling them consequently in the simulation "launch-string" could be enough or do I have to write a unique file .f/.for managing the two different constitutive models within it?

Thanks,

with the bests.