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Messages - Mark Barkey

#31
Quote from: SOMANATH MOHANTY on August 07, 2018, 03:16:00 PM
1- suppose I want to carry out any fracture experiment in any material then it can be modelled by lEFM/EPFM. Is there any strength related perticular parameter that distinguish both of them prior to experiment?

If I understand your question, you want to test a material and know before you test it if the conditions of LEFM or if EPFM conditions prevail?

The answer is no, you cannot.  If you look at the ASTM test procedure (metals) for conducting plane strain fracture toughness testing (KIc) then there are several conditions that must be met that can only be determined after the test has been conducted.

However, you can look at the ASTM test procedure for JIc testing, which assumes EPFM, and use that instead.   








#32
Quote from: SOMANATH MOHANTY on July 31, 2018, 01:51:15 PM

2. The asymptotic solution at crack tip gives singularity near that point then what happened to the solution when higher order terms included in the solution?
3.we want to extend LEFM concepts to rock like material then what is the effect of these higher order terms in finding fracture parameters?

The higher order terms are more of an influence away from the crack tip.  I don't think it will affect any fracture toughness parameters unless the process zone of the crack extends more than "usual".

In my opinion, anisotropy of the material may be more of an issue than the higher order terms.  However, please note that I am not an expert in Rock Mechanics.

Thanks,
MEB
#34
Welcome Center / https now available
July 08, 2018, 10:28:58 PM
The server is now supported with https.  I will try to update any links but it may take a while.
#35
Ask about videos, lectures, or anything about Mechanics here. 

I will do my best to answer them. 
#36
Compilers should be installed before ABAQUS if possible so that the paths can be automatically set up.

It is not impossible to work with if the compilers are installed second, but there is more work involved if you install them second.

To see what Simulia used to test ABAQUS 2018 go to this link:
https://www.3ds.com/support/hardware-and-software/simulia-system-information/abaqus-2018/test-configurations-for-abaqus-2018-products/

and then then expand the Windows link, click on the windows 10 link to get a PDF with the test configuration.

Here is what it says for compilers:

Quote
Date: Mon Nov 13 14:35:09 2017
[some info deleted]
Processor: Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz
Number of CPUs: 4
Physical Memory: 16311 MB
Virtual Memory: 12179 Available / 18744 Total Mbytes
OS Version: Windows 10 Enterprise (Build 14393) C++
Compiler: Microsoft Visual C++ 14.0.24215.1
Linker Version: Microsoft (R) Incremental Linker Version 14.00.24215.1
Fortran Compiler: Intel Fortran Compiler 16.0
MPI: MS-MPI 5.0.12435.6
Browser: Internet Explorer 11.0.14393.1715

... so it looks like Fortran 16.0 is needed. Lastly, here is a link that tells you that Fortran 16.0 is Intel Fortran 2016.
https://software.intel.com/en-us/articles/intel-compiler-and-composer-update-version-numbers-to-compiler-version-number-mapping


For other versions of ABAQUS, follow similar steps.
#37
Command line option to *not* prompt for overwrite:

ask_delete=OFF


placed in Custom_v6.env

C:\Program Files\Dassault Systemes\SimulationServices\V6R2018x\win_b64\SMA\site

(or similar)
#38
sequential abaqus jobs


abaqus interactive job=jobname1 cpus=4 & abaqus interactive job=jobname2

The "interactive" option makes sure the first job completes before the second starts.

reference:  http://imechanica.org/node/18290

#39
2018 documentation reference
Abaqus | Execution | Parallel Execution | Parallel execution in Abaqus/Standard




abaqus job=job-name cpus=n
abaqus job=job-name standard_parallel=all cpus=n
#40
Allied High Tech:
Customer Number:  45-0024

80-10140  Cutting Fluid, Oil Based, 128 oz. (3.8 L)

ASSORT-PSA  Silicon Carbide Paper Assortment Pack, 8"/200 mm Adhesive Back Disc (25) each: 180, 320, 600 & 1200 Grit

80-11305  Aluminum Oxide Cut-Off Blade, Resin Bond 7" x .030" x 1.25" (175 x .76 x 32 mm) (Pk/10)

diamond suspension and cloths as needed
90-32120 Diamond Suspension, Water Based Monocrystalline, 3 Micron, EACH 16 oz. (480 mL)




-------------------
#41
*Include

used to import a text file into and input file; example for windows:
*include, input="include-file-name.inp"

the file needs to reside in your working directory or the temp directory location.
#42
HyperMesh / How to capture JPG file from HyperMesh
June 12, 2018, 11:10:19 PM
From the top menu bar select:
Preferences, Graphics,

then on lower panel
Graphics Files, Save JPEG

Note:  file save location is at c:\Users\<name>\My Documents\imageXXX.jpg

where XXX is the file number.
#43
From the link below:

http://abaqustipsno.blogspot.com/2016/08/abaqus-connector-tips-for-visualization.html

Quote
Abaqus connector tips (for visualization for connectors)
Abaqus connector tips (for visualization for connectors)


1
At visualization module, you can display connectors as followings

View - ODB display option - Entity Display Taps - Check show connectors

if you needs related points, axes and connector types, also check highlight connector points, show local axes, connector type


2
Output variables related to connectors are CTF (*total forces and moments) and CU (relative displacements and rotations) which are not default variable and commonly used.
If Above variables are not requested, you can not check that whether connectors are modeled properly and its reaction force (when connector displacement applied) or reaction displacement (when connector force applied).


*As you know, 'total' means 'elastic + plastic'

At step module, you can add field output related to connectors as followings

- Creat Field output request

- set 'domain' to be 'set' and select wire set at which you want to see outputs
* if 'domain' is 'whole model', you can not see the CTF and CU

- check CTF and CU