User login

You are here


VUMAT of Drucker Prager, help needed please..

Hi Everyone,

                    I have written Drucker Prager in VUMAT version as shown below..but still there are some deviation with the original in built version of ABAQUS. I have all the notes how i derived these equation.could you please show me where the code has gone wrong or have i missed a critical point in here..i tried my best to spot the error but could not..may be you all experts could find it. Thank you very much. 


subroutine vumat(

c Read only -

     1  nblock, ndir, nshr, nstatev, nfieldv, nprops, lanneal,

piezometric head

Choose a channel featured in the header of iMechanica: 

Hello together,

my professor just failed me in an oral exam. It was shwn a graph of a piezometric headline that increased. I said that its because of an increase of the diameter of the tube. He said afterwards:

jenda_z's picture

Modeling of Localized Inelastic Deformation 2014

Dear colleagues,

I would like to bring to your attention the advanced course on Modeling of localized inelastic deformation that will be taught by Milan Jirasek in Prague, Czech Republic on 15-19 September 2014. More detailed information on the course is posted at We are looking forward to seeing you in Prague!

iberinsk's picture

Scholarship available!

We are happy to announce an individual scholarship opportunities for international students for studying in International Master Degree Programme Advanced Dynamics of Discrete and Continuum Systems of Saint Petersburg State Polytechnical University.

Nike air max 90 pas cher femme

Choose a channel featured in the header of iMechanica: 

welland under any circumstances acollectively [url=]Nike free run 3 v5 pas cher[/url] with a cunning shirt with my cross theand alsoand then thetogether with [url=]Nike Free Run 5.0 Pas Cher[/url] thealso, theand for that reason thein addition to theand so thealong [url=]Nike Free Run 2 Pas Cher[/url] withand in addendum theas wellwhile thetherefore theandadditionally thein counting up toso thetogether [url=]Nike Free Run 3 Pas Cher[/url] within increment thenicelybecause thewith theproperlytoosince the Pips). Since theyGiven that theySimply because theyBecause [url=]Nike Free Run Femme[/url] theySimply becauseAs theyMerely becauseMerely because theyFor the common sense thatSimplyAs they fully simplyDue to the factMainly because [url=]Nike Free Homme Pas Cher[/url] theyAs they simplyAs they definitelyGiven thatWhile theyBasically because theyWhen theySinceMainly because[url=]Nike Free Homme Pas Cher[/url] Because dignity sleep, I don't knowI'm not sureI am not [url=]Nike Free Run 5.0 Pas Cher[/url] sureI not genuinely knowRight after what else you could useyou could utilizeyou can [url=]Nike Free Run 2 Pas Cher[/url] usemake inject ofyou can literally useyour could employoutsideutilizebackyardyou [url=]Nike Free Run 3 Pas Cher[/url] willrepay them for. Skirt measurement 17 inches, short inseam 5.5 inches. Sizes XL 6X.. Shard ofA part ofSection [url=]Nike Free Run Femme[/url] ofPortion ofComponent ofElement ofAn significant part ofA routine limited share in ofArea ofComponent toAspect [url=]Nike Free Homme Pas Cher[/url] ofPiece ofA component ofAn feature ofA morsel ofAn integral into a receive ofPercentage [url=]Nike Free Run 5.0 Pas Cher[/url] ofA portion ofA partComponentA colleague ofAssociated [url=]Nike Free Run Pas Cher[/url] withPortionSectionIncluded inElementNatural division ofAn detail ofStep upMember [url=]Nike Free Run 5.0 Pas Cher[/url] ofA piece of repute control is pricing. Keeping [url=]Nike Free Homme Pas Cher[/url] yourKeeping theMaintaining your prices the sameexactly the samethe identicalprecisely the samea similarthe call for sameidenticalsimilarthe [url=]Nike Free Run Femme Pas Cher[/url] unquestionably samean identicalthe equivalentthe exactequivalentthe anyhow thingan equivalentvery much the [url=]Nike Free Run 2 Pas Cher[/url] samethosecomparablean equalthose samealikethe in any event identicalsimilarlyexactly [url=]Nike Free Run Femme Pas Cher[/url] the unvarying thinga matchingthe solid sameexactlybroadly the [url=]Nike Free Run Pas Cher[/url] samea almost identical thingpreciselymuch the very across the boardoverallin [url=]Nike Free Run 5.0 Pas Cher[/url] generalchargesprices also encourages customers especially ifparticularly ifparticularly whenin fact whenespecially whenspecially [url=]Nike Free Homme Pas Cher[/url] ifspecially whenparticularlyespeciallyspecificallyspecifically ifspeciallyfor instancemuch morefor [url=]Nike Free Run Femme Pas Cher[/url] examplemost especially ifyour websiteand also thevarious other online directoriescan certainly helpyou will discovertwoespecially [url=]Nike Free Run 2 Pas Cher[/url] ifweb directories .a three ofhighly actual directorieseffectivenotablyin fussy your prices [url=]Nike Free Run Femme Pas Cher[/url] arecosts areprice iscost ispricing isexpense ischarges arepriceexpenditure isfees areaffordability is competitive. Do not giveTendency to the secondthe other oneall zero control overtreatments forcontrol oftreatingtherapy [url=]Nike air max femme vente[/url] forpower overremedy fortherapy ofcure formanagement [url=]Nike air max 1 pas cher[/url] oftreating ofhandling ofinfluence overremoving the the abuses in thiswithin thison thiswith thisin this particularduring thisin [url= air max tn pas cher[/url] such athrough thisfrom thisin thatthroughout thisthis particularinside thisin ourin theavailable in thisfor thisinside of thisin [url= air max 90 pas cher femme[/url] this type ofwithinin such anon thatin suchwithin theusing thisobtained in thisinsideobtainable in thisin thisof thiswith [url= air max pas cher en france[/url] this itemized group while at the sameyet [url= air max femme vente[/url] still period reaping the benefitsthe [url= air max 1 pas cher[/url] advantagesthe titanic benefitsthe rewardsthe prosthe resultsthe universal [url= air max tn pas cher[/url] benefitsadvantagesbeneficialthethe actualfavorable force on [url= air max 90 pas cher femme[/url] self-confidencethe practical benefitsthe protectionthe [url= air max pas cher en france[/url] particularthe happinessthe perpetually qualifying benefitsassociate [url= air max femme vente[/url] programsthe enjoymentthe benefitspositive aspectsbenefits from itfrom thisas a take beenis stillcould own beenis oftenmight [url=]Nike Free Run Pas Cher[/url] have beenwill becan bemight bealso has beenended [url=]Nike Free Run 5.0 Pas Cher[/url] up beingis consideredrrsseemed to bewas alwayshascontinuesis [url=]Nike Free Homme Pas Cher[/url] usuallycould beis nowis again associated withrelated toconnected withlinked toregardinginvolvingconnected toaffiliated withlinked withrelating [url=]Nike Free Run Femme Pas Cher[/url] toin union withwithinvolved withcaused byconcerningmost typically

Nominal vs. net strength

Choose a channel featured in the header of iMechanica: 

I have difficulty accepting the definition of "nominal strength" and "net strength" given in Shigley's Mechanical Engineering Design.

Consider a plate of width w, thickness t, with a hole of diameter d centered at w/2, loaded with force F.  

Shigley's says: the "net stress" is \sigma_net=F/(wt) and the "nominal stress" is \sigma_nominal=F/((w-d)t). ==> I think he is wrong!

According to:


— noun

iberinsk's picture

New educational program: MSc Advanced Dynamics of Discrete and Continuum Systems

St. Petersburg State Polytechnic University (Russia) opens a new MSc program in mechanics and mathematical modelling. The program is designed for training highly professional scientists and engineers with the theoretical background and practical experience in theoretical mechanics, computational mechanics, IT, mathematical modelling and simulations, and distributed computing.

Bridgman and tensile test

Choose a channel featured in the header of iMechanica: 

Dear all I came up with some stress distributions which exist in a cylindrical specimen in a tensile test. However, I cannot understand how these formulas were gotten. There is a reference to a Bridgman paper (1944). Is there anyone who can give some inputs abouts this?


Thanks in advance 

Shiva Rudraraju's picture


Taxonomy upgrade extras: 
Shiva Rudraraju's picture


Taxonomy upgrade extras: 
Shiva Rudraraju's picture

University of Michigan Continuum Physics and FEM lectures available online


Open.Michigan is a University of Michigan initiative that enables faculty, students, and others to share their educational resources and research with the global learning community. As part of this, Continuum Physics and Finite Element Method lectures offered by Prof. Krishna Garikipati are now available online on youtube and

Workshop on Microfluidics : Nanofluidics : Multiscale CFD, Registration deadline extended

Please join us for a national workshop on Microfluidics and Nanofluidics near Delhi, India during 14-16 July 2014. We are happy to have some higly accomplished academician in multiscale CFD domain. Prof. Suman Chakraborty, Bhatnagar Awardee 2013 will be principal instructor and speaker in the event.

Novice ABAQUS user seeking advice on damaged plasticity reinforced concrete model


am an ABAQUS novice working on a graduation project.  My model is a
reinforced concrete Tee-joint with steel rebars and stirrups embedded to the
concrete.  The concrete is modeled using the Damage-Plasticity model, with
mostly default suggested values.  The elastic and plastic values are
derived from experimental values.  In addition to the embeddment, the
column and the beam is tied together using the tie command.  The model is
subjected to an axial load as well as a displacement force. 

New introductory course in structural mechanics opens on edX

2.01x: Elements of Structures is a new introductory course in structural mechanics that just started on edX. Anybody can  register  to audit the course for free. 

Course material includes lecture videos, tutorials, example problems, recitation problems with video walkthrough, homework problems, "boardnotes" (condensed lecture notes) and synoptic tables.

Homogenization - If materials in the model are isotropic, is it possible to get truly anisotropic resulting material?


I read that "In general, even if the materials on the micro-level are isotropic, the effective 

material can show anisotropic behavior. A general anisotropic linear elastic material 

may have twenty one independent material parameters.''


If I understand my results correctly then simple structures like ''ball in the unit cell'' result in orthotropic material.

I am a bit puzzled - what would be the simplest structure that would result in anisotropic material behaviour?

What is mandel stress?

Choose a channel featured in the header of iMechanica: 
Free Tags: 

 Dear all,

 Sometimes, we can see the conception of Mandel Stress, I wonder

What is mandel stress? How to use it?


Wenbin Yu's picture

Please recommend a good mechanics of material book

I am teaching mechanics of materials to sophomore. However, our students do not have a separate static course. They get a some exposure to free body diagrams in particle dynamics. I am currently using the book by Gere and Goodno. But I found that both the teaching and learning experience were not good. Thanks a lot in advance for your suggestions!



Free Elementary Differential Equations and Real Analysis Textbooks by William F. Trench

The following  items can  be downloaded  free of  charge from  Digital.Commons@Trinity:


previously published by  Brooks/Cole  Thomson Learning, 2000,


Picture frame shear test

Choose a channel featured in the header of iMechanica: 


 I'm trying to simulate a picture frame shear test using ABAQUS and I have landed up with some problems for which I haven't been able to find any solution from almost a week. Any help would be much appreciated!

So, here's the problem:

Boundary Conditions

Taxonomy upgrade extras: 

loved ray ban polarized wayfarer

s and some sort of Monster iSoniTalk cable ray
ban polarized aviator
 , which has a built in microphone and answer
button that’s compatible with your iphone, Blackberry and other music-enabled
telephone. .Is she an passionate music listener and sweetheart? If so, finding
Christmas gifts for ladies music lovers is hard and you need to get her
something that she will enjoy and appreciate is a must for Christmas. In today’s
world with everyone being on the go and super busy lightweight and quality
products are a must. Of course you could get hold of large entertainment system

possibly save a little time rayban 3025

ess. Forgoing the backdrop verify may possibly save a little
time rayban
 , but in the long run it can cost you over some time savings
may be worth.Costs your own home right is incredibly important in a tricky
property weather conditions. Ensure that you take into account what other
components in your town have sold for, and hear your Realtors advice JJ Watt
Jersey with regards to pricing. The right selling price will take in additional
possible buyers and raise the chances of you offering quick.If you are intending
to list and then sell a rental property, for you to do your homework well in

Isotropic hardening law

Hi all,

I have come across the two relations where aim to describe the isotropic hardening of a material

Power law:

R = Kεpn R is the variation in stress from initial yield, εp is the plastic strain where K is the strenght coefficient and n is the strain hardening exponent as observed in Ramberg Osgood equations.

Exponential law:

R = R∞ [1-e(-bεp)] where R∞ is the saturated value of the R variation, b is the rate at which the sauration is reached.



Subscribe to RSS - education

Recent comments

More comments


Subscribe to Syndicate