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Messages - Mark Barkey

#16
Questions and Answers about ABAQUS / ABAQUS license check
November 16, 2020, 02:54:23 PM
Execute this command to check on the ABAQUS license status:

Abaqus licensing ru
#17
I've seen an issue in Hypermesh 2019 in which the nodes do not appear on the screen.  This makes it impossible to use Hypermesh effectively.

Here is the fix:

create a system variable HW_USE_OPENCL with a value of 0

#19
Scripting and Python / Re: ODB temperature writer
October 07, 2020, 12:15:49 AM
Need to add that this won't work if you run it from ABAQUS CAE, you must run from command window as ABAQUS python scriptname.py
#20
The are two input files in there.
#21
Hi--I think scripting is definitely what you want to do.  I have some youtube videos on basic scripting.  I think that may be a place to start.  I do not have a script for your particular problem--but if you develop one, I would encourage you to post it here so that others can benefit from your effort. 

Take care,
MEB
#23
Hi, I am sorry to say that I will not have time for a detailed look due to a change in job duties.
#24
Are you referring to input stress-strain or the output from an analysis?
#25
Welcome Center / Re: Welcome to the forums
April 13, 2019, 02:45:36 AM
Thanks Sagar--
#26
Welcome Center / Re: Welcome to the forums
March 28, 2019, 01:19:27 AM
Very nice--thanks for posting and happy studies  :)
#27
Those are great questions, but ones that I cannot answer in a meaningful way.  Best wishes!
#28
Quote from: SOMANATH MOHANTY on January 25, 2019, 02:29:11 AM
Questions
1- what is the physical meaning of stress intensity factor value to be Zero or negative in a centre crack under compression loading or it is not possible to get -ve SIF?
2-in a mixed mode case is j-integral is Path independent?
3- EPFM is applicable to nonlinear material behaviour case but as   the process zone is nonlinear then how superposition principle is applicable to this EPFM plastic models like dugdale.. others?

For a center crack in compression, the crack faces should transmit tractions, so the stress fields (ideally) would be very similar to an uncracked plate in compression.  I do not know of a situation where a negative stress intensity would be physically meaningful or possible.

I believe that the J-integral should still be path independent for mixed mode loadings, but I have not done the math, or if I have it has been forgotten.  I think this should be derived in an advanced fracture mechanics book.

It has been a while since I have looked into the Dugdale model, but it may be the stress fields outside of the process zone for which supperpostition is applied.  I will have to let someone else answer that one!

#29
Welcome Center / Re: Welcome to the forums
January 18, 2019, 04:32:46 AM
Welcome.  Thanks for signing up.  It is a bit quiet here, but I promise to keep the site up for many many more years  :)
#30
General Mechanics Discussion / Re: Tension Testing
August 30, 2018, 08:41:04 PM
Quote from: SOMANATH MOHANTY on August 30, 2018, 11:39:10 AM
hello, professor sir, I found your experimental video from your channel. Your explanations are awesome and very precise. I have a query on the tension test experiment.

I have a 2mm thickness sheet. I want to find the Poisson's ratio and youngs modulus through experiment. I am following the standard Flat test specimen size as per ASTM  test standard DESIGNATION-E8/E8M. As per standard prescribed thickness range lies within (0.005 ≤ T ≤ 0.75) in. So is there any variation in results if I select a minimum thickness and also variation in the result if I select multiple samples. If variation exists on results then how much variation?

If it is a metallic material, I would suspect that the actual material variation would be rather low for those two material properties.  Having said that, you may get some variation for very thin sheet vs thicker sheet but I think that variation would be due to the test set up.  Very thin sheet can be very easily distorted when clamping it into the testing machine grips.

2 mm is a nice thickness and I don't think you would have a problem with that for metals.  Poisson's ratio can be tricky if you use strain gages, too, in that it will not be very constant.  I think there is a good reason that Poisson's ratio is usually reported to only two significant digits.

Hope that helps.