priyadd84's blog
https://imechanica.org/blog/7208
enVUMAT Error
https://imechanica.org/node/10965
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all ... I did a simple one element elastic simulation of VUMAT and everything<br />
(force balance) is fine.My aim is to change<br />
young's modulus during runtime using strain rate data. So i want to<br />
write VUMAT for the elastic model only and plastic model<br />
(Drucker-Prager) and damage models i want to use the inbuilt one. But<br />
when i tried to run *drucker prager along with my VUMAT i got the<br />
following error.<br />
The option *user material,type=mechanical completely<br />
defines the material behavior. It can not be used with an option that<br />
defines part of a material`s behavior<br />
*drucker prager requires the use of *elastic, *porous elastic, or the combination of *eos and *eos shear, type=elastic options</p>
<p>A material property that is not allowed with a user material has been specified</p>
<p>Analysis Input File Processor exited with an error.</p>
<p>As<br />
i dun want to code drucker prager and rest of the stuff. Is there a way<br />
to tell *drucker prager tht my VUMAT actually the *Elastic?. Thanks.</p>
</div></div></div>Wed, 24 Aug 2011 05:44:22 +0000priyadd8410965 at https://imechanica.orghttps://imechanica.org/node/10965#commentshttps://imechanica.org/crss/node/10965VUSDFLD + Error in connection to analysis
https://imechanica.org/node/10964
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all ... Am trying to run a model with VUSDFLD+vgetvrm to get<br />
strain components from the odb. But am getting an error "ERROR in job<br />
messaging system: Error in connection to analysis". If someone can point out a<br />
possible reason for this error, that may help me to resolve the issue.<br />
Also if anybody is interested in looking the problem more closely , I<br />
am open to sending the source files. thank you.</p>
<p>Priya</p>
</div></div></div>Wed, 24 Aug 2011 05:43:10 +0000priyadd8410964 at https://imechanica.orghttps://imechanica.org/node/10964#commentshttps://imechanica.org/crss/node/10964Difference between plastic and Elasto-plastic deformation
https://imechanica.org/node/9787
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/179">solid mechanics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all
</p>
<p>
What is the difference between plastic deformation and Elasto-plastic deformation? Thank you all.
</p>
</div></div></div>Fri, 11 Feb 2011 05:42:34 +0000priyadd849787 at https://imechanica.orghttps://imechanica.org/node/9787#commentshttps://imechanica.org/crss/node/9787State of hydrostatic stress along shear zone.
https://imechanica.org/node/9162
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3365">Shear</a></div><div class="field-item odd"><a href="/taxonomy/term/5693">Hydrostatic</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Dear all,</p>
<p> I did a three point bending test on a brittle rod. I observed an oblique fracture (slant approx 45 degrees). It can be an easy conclusion that this 45 deg crack is due to shear failure. But i have the following questions</p>
<p>1. Can a shear band occur in bending mode? as in literature very frequently shear bands are reported in pure tension and compression.</p>
<p>2. What is the state of hydrostatic stress or the principal stresses along line of shear band (whether the hydrostatic or principal stresses increase or decrease with bending)? as it is well known that even in max shear state there exists normal stresses.</p>
<p>3. When i simulated the setup in LS Dyna using hydrostatic cut off stress (element fails on reaching a critical hydrostatic tensile stress) as failure criterion the results matches well with the experiment however i still dont clearly understand how hydrostatic cut off stress predicts the slant crack very well.</p>
<p>Experts in the field please throw some light on the answers of the above questions. Thanks in advance. </p>
<p> </p>
</div></div></div>Mon, 25 Oct 2010 11:53:55 +0000priyadd849162 at https://imechanica.orghttps://imechanica.org/node/9162#commentshttps://imechanica.org/crss/node/9162Slope of Contact force Vs time curve too steep.
https://imechanica.org/node/9130
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/289">ABAQUS</a></div><div class="field-item odd"><a href="/taxonomy/term/598">contact</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Dear all,</p>
<p> I did a 3 pt bending impact simulation with an elasto plastic model. But the slope of contact force vs time curve is too steep at the beginning of the impact. One trivial way of reducing the slope is by reducing the young's modulus of elements in the vicinity of contact or the impactor. Also reducing the mass of the impactor and the impact velocity did not help in reducing the slope.</p>
<p>Is there any other non-trivial parameters that controls the slope of contact force vs time plot? Thanks ina dvance.</p>
<p> </p>
<p> </p>
</div></div></div>Thu, 21 Oct 2010 04:36:35 +0000priyadd849130 at https://imechanica.orghttps://imechanica.org/node/9130#commentshttps://imechanica.org/crss/node/9130How to find sum of all nodal forces in a plane in Abaqus.
https://imechanica.org/node/9120
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/289">ABAQUS</a></div><div class="field-item odd"><a href="/taxonomy/term/5672">Forces</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hello all,</p>
<p> How to find sum of all nodal forces along a plane in abaqus. Thanks in advance.</p>
</div></div></div>Wed, 20 Oct 2010 09:33:41 +0000priyadd849120 at https://imechanica.orghttps://imechanica.org/node/9120#commentshttps://imechanica.org/crss/node/9120Prony series for viscoelasticity in Abaqus.
https://imechanica.org/node/8991
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all,</p>
<p> My first question is i have a set of stress Vs strain data for different strain rates (100/s to 350/s). Can prony series be extracted using these data? Or is there a way in Abaqus i can enter directly this data?</p>
<p> After reading for a while a came to know that stress relaxation data is needed for defining pony series. My second question is can stress relaxation data can be obtained for high strain rates in the order of 100 to 350/s?</p>
<p>Thanks all </p>
<p> </p>
</div></div></div>Mon, 27 Sep 2010 16:45:25 +0000priyadd848991 at https://imechanica.orghttps://imechanica.org/node/8991#commentshttps://imechanica.org/crss/node/8991Coupled Euler-Lagrangian FEA to simulate fluid entering micro pores in Abaqus/Explicit
https://imechanica.org/node/8945
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/289">ABAQUS</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all,</p>
<p> How to model a pipe which has pores in its internal surface, when the pipe is filled with water and closed at the both ends. Now when the pipe is impacted in the 3 point bending mode water will enter in side the pores and will cause some damping (resist bending).</p>
<p> Is there a modeling technique in Abaqus to do this type of analysis? We need to have the pores modeled as well as water entering inside the pores, however i want to do the simulation in the macro level (i want to simulate the full pipe). Thanks in advance. </p>
</div></div></div>Tue, 21 Sep 2010 06:13:58 +0000priyadd848945 at https://imechanica.orghttps://imechanica.org/node/8945#commentshttps://imechanica.org/crss/node/8945Good book(s) on beam and plate theory.
https://imechanica.org/node/8609
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/172">book</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all ... can somebody suggest me good book(s) on plate/beam theroy? The book should start for a novice and should go till large deformation part. Step by step explanation atleast for first few chapters should be there. Thank you.</p>
</div></div></div>Mon, 26 Jul 2010 21:12:37 +0000priyadd848609 at https://imechanica.orghttps://imechanica.org/node/8609#commentshttps://imechanica.org/crss/node/8609Pros and Cons of element deletion in Abaqus
https://imechanica.org/node/8568
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/5402">Pros and Cons of element deletion in Abaqus</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span class="Apple-style-span">Hi all ... i have been doing element deletion extensively in my analysis but was wondering ... wat are the Pros and Cons of using this method. To my knowledge was wondering how the deleted mass and energy are conserved through out the analysis. Thank you all.</span></p>
</div></div></div>Mon, 19 Jul 2010 15:04:45 +0000priyadd848568 at https://imechanica.orghttps://imechanica.org/node/8568#commentshttps://imechanica.org/crss/node/8568Good substitute for cowper-symonds in Abaqus
https://imechanica.org/node/8469
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1589">Material Model</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all, I want to capture strain-rate behaviour of materials but unfortunately abaqus does not have Cowper-Symonds which is a widely used (simple) model. However johnson-cook is to complicate for me as not much details are available in literature as i am modeling bio-materials. Is there any good substitute for Cowper-Symonds models in abaqus. Thanks.</p>
</div></div></div>Mon, 28 Jun 2010 04:43:17 +0000priyadd848469 at https://imechanica.orghttps://imechanica.org/node/8469#commentshttps://imechanica.org/crss/node/8469Material Parameter Calibration for Johnson Cook
https://imechanica.org/node/8452
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/289">ABAQUS</a></div><div class="field-item odd"><a href="/taxonomy/term/846">FEM</a></div><div class="field-item even"><a href="/taxonomy/term/5336">Materrial model</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span class="Apple-style-span">Hi all ... Is there a way to find/calibrate material parameters for johnson and cook material model using experimental data in Abaqus? .. As far as i know abaqus has something called as data editor with which Hyperelastic materials models can be calibrated with experimental results. If not is there any other way arround to do calibration of material parameter with abaqus.</span></p>
</div></div></div>Thu, 24 Jun 2010 11:02:41 +0000priyadd848452 at https://imechanica.orghttps://imechanica.org/node/8452#commentshttps://imechanica.org/crss/node/8452Charpy Vs Gardner test
https://imechanica.org/node/8381
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi ... what is the difference in functionality between charpy (a simply supported specimen(notched/unnotched) is hit by a swinging pendulum)and gardner test (a simply supported specimen(notched/unnotched) is hit by a vertical free falling mass guided by rails) .... </p>
<p>1.What is the loading pattern in the point of contact between the specimen and the setup?</p>
<p>2.Why fracture pattern varies between the two test setups for similar specimen with same impact velocity, Which parameter is responsible for the variation in fracture type. </p>
</div></div></div>Thu, 10 Jun 2010 12:29:50 +0000priyadd848381 at https://imechanica.orghttps://imechanica.org/node/8381#commentshttps://imechanica.org/crss/node/8381Hydrostatic pressure stress element removal criterion in Abaqus.
https://imechanica.org/node/7759
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/289">ABAQUS</a></div><div class="field-item odd"><a href="/taxonomy/term/427">failure</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all,</p>
<p> Recently i tried Hydrostatic pressure stress element removal criterion in Abaqus(<span class="Apple-style-span">19.2.8 Dynamic failure models in the 6.9 manual<span class="Apple-style-span">) . I used 75 Mpa as cut-off pressure stress and after which the material fails. During post - processing i tried to measure the pressure stress in an element that failed but the element did not fail at 75 Mpa and i checked few other elements, also i found the same thing none of them failed at 75 Mpa. What could be the possible reason? </span></span></p>
<p>Thanks </p>
<p>Mike </p>
</div></div></div>Mon, 08 Mar 2010 06:38:42 +0000priyadd847759 at https://imechanica.orghttps://imechanica.org/node/7759#commentshttps://imechanica.org/crss/node/7759Confusion in understanding Hydrostatic Stress context to failure
https://imechanica.org/node/7626
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/131">stress</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all,</p>
<p> I have few questions here : </p>
<p>1.From my reading i can understand there is a long debate going on stating Hydrostatic Stress (HS) have/have not influence over yielding and failure of materials. Some people say when only HS is applied the material become 'incompressible' and the HS donot influence yielding. Some people say when the material is porous the HS load do have influence in yielding as there is room for deformation when the pores collapses. To add more confusion some say even the material is not porous HS have influence over yielding. Someone please throw some light on these arguments and which one is true?</p>
<p> </p>
<p>2. Say a specimen is uniaxially loaded and simultaneously a hyrostatic stress(p) is also applied can we say say the stress devoloped Sigma_x = Sigma + p ? Do the applied HS will directly get added with the stress induced in the material?.</p>
<p> </p>
<p>3.Is there any standard experiment procedure to show HS have influence over yielding and failure? </p>
<p> </p>
<p>Please forgive my understanding and correct me if i am wrong. </p>
<p> </p>
<p>regards, </p>
<p>Mike </p>
</div></div></div>Sat, 20 Feb 2010 06:52:18 +0000priyadd847626 at https://imechanica.orghttps://imechanica.org/node/7626#commentshttps://imechanica.org/crss/node/7626Hydrostatic stress as Fracture/Damage criterion?
https://imechanica.org/node/7141
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/31">fracture</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all,
</p>
<p>
Can Hydrostatic stress be used as a fracture criteria? If so can critical hydrostatic stress be found experimentally? Thanks.
</p>
</div></div></div>Tue, 24 Nov 2009 17:00:05 +0000priyadd847141 at https://imechanica.orghttps://imechanica.org/node/7141#commentshttps://imechanica.org/crss/node/7141Why different failure criterions when one can be related with the other?
https://imechanica.org/node/6977
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/427">failure</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Hi all,<br />
I have a basic question (and cud be a stupid one too :). Why we have an energy criterion for fracture? When we can always derive energy from stress and strain (or stress and young's modulus or strain,stiffness and displcement) ... How a energy criterion basically differs from stress and strain criterion? .. As far as i read it is said energy criterion shud be used when plasticity comes into picture .... but still in the plastic region plastic stress and plastic strain have unique relation then why again we bother about ENERGY? ... Won't it be sufficient to have a stress based or strain based criterion? .. again i wonder why there is even stress and strain based criterion ! as they can be related directly through some material constant. It could be a stupid question kindly experts in this area help me get it cleared. Thanks.</p>
</div></div></div>Fri, 23 Oct 2009 07:32:24 +0000priyadd846977 at https://imechanica.orghttps://imechanica.org/node/6977#commentshttps://imechanica.org/crss/node/6977Advantages of XFEM over std FEM
https://imechanica.org/node/4633
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Hi all .. What are the advantages of XFEM over std FEM other than remeshing ?
</p>
<p>
Because when ever XFEM is introduced only remeshing alone is highlighted ... Can the experts from this field please list out the other advantages?
</p>
<p>
<br />
All above are in context to Fracture.
</p>
<p>
thanks in advance.
</p>
</div></div></div>Tue, 13 Jan 2009 05:12:49 +0000priyadd844633 at https://imechanica.orghttps://imechanica.org/node/4633#commentshttps://imechanica.org/crss/node/4633How to import Ls-Dyna files(*.k) to Abaqus CAE 6.7 Edu version
https://imechanica.org/node/3870
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
How to import what i beleive is Ls-Dyna files with an extension (.k) in to Abaqus CAE 6,7 edu version?? . Any free translaters are available or can it be done with Abaqus itself ??
</p>
<p>
Thx in advance
</p>
<p>
mike
</p>
</div></div></div>Mon, 22 Sep 2008 06:14:22 +0000priyadd843870 at https://imechanica.orghttps://imechanica.org/node/3870#commentshttps://imechanica.org/crss/node/3870Need a hand to pull me into the world of XFEM !!
https://imechanica.org/node/3797
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/694">crack propagation</a></div><div class="field-item odd"><a href="/taxonomy/term/2784">Numerical issues</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Dear all,
</p>
<p>
I am new to X-FEM, started reading papers a couple of weeks before. I understood, functions[heaviside,sign..] are used to enrich the nodes to simulate virtually the discontinuity and asymptotic functions are used to charecterize the crack tip,other than this regular FEM nodes are there. I have few questions.
</p>
<p>
1.what is the role of the asymptotic functions and its unknown co-efficient 'b' in charecterizing the crack tip. What are the parameters do these functions exactly charecterize means wat are the details can we extract from these fns n co-effs?
</p>
<p>
2.I think the simulation will start with the initial crack. after inverting the k matrix we get u(classical fem disp) , a (crack opening length b/w the new surfaces ??? ) , b (not sure wat this is , my guess is crack tip's new displacement ??? ), How the new segment of crack growth(n its direction) is calculated ?? as till now SIF's never came into picture??
</p>
<p>
3.which parameter will be incremented for the second step and how the result from the first step is used in the second step? say in quasi-static.
</p>
<p>
I know some questions are really dumb for those who are familiar with XFEM, Kindly help me in understanding the above questions. Thanks in advance.
</p>
<p>
mike
</p>
</div></div></div>Fri, 05 Sep 2008 21:36:52 +0000priyadd843797 at https://imechanica.orghttps://imechanica.org/node/3797#commentshttps://imechanica.org/crss/node/3797Difference b/w ref pt and datum pt in ABACUS??
https://imechanica.org/node/3251
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/128">education</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>what is the Difference b/w ref pt and datum pt in ABACUS??</p>
</div></div></div>Fri, 30 May 2008 16:56:31 +0000priyadd843251 at https://imechanica.orghttps://imechanica.org/node/3251#commentshttps://imechanica.org/crss/node/3251Error | iMechanica