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Updated: 11 hours 2 min ago

Sharing UMATs via Mendeley Data

Wed, 2018-05-30 03:15

In reply to Sharing ABAQUS UMAT and VUMAT subroutines

Elsevier Journals offer the opportunity to share things like UMATs as supplementary material to the respective journal articles. It can be published under a Creative Commons license and you can update the source code at any time.  We published the UMAT of our current article (a gradient-enriched damage model) at

https://data.mendeley.com/datasets/p6bgny6ff3/1

Geralf

 

Avoiding changes in the environment file

Wed, 2018-05-30 03:05

In reply to re: running free format fortran

Some comments:

a) In order to avoid to change the environment file, you can set compile options also within the source code by means of compiler directives. For the Intel Fortran compiler, you just need to add

!DEC$ FREEFORM

at the beginning of the source code. The file can retain the suffic .f ( or .for in windows) and you just run it with

abaqus -j jobname user=UMAT

b) If you want to use explicit type declaration without defining the types by hand or making copies of the file ABA_PARAM.INC, you can readout the latter from Abaqus within a module which you define before your UMAT (or any other user subroutine):

MODULE ABQTYPE
   INCLUDE 'ABA_PARAM.INC'
   INTEGER,PARAMETER,PUBLIC::AbqRK=KIND(r),AbqIK=KIND(i)
END MODULE

Now you can read the use the parameters AbqRK and AbqIK within your subroutine

USE ABQTYPE

IMPLICIT NONE

REAL(KIND=AbqRK)::variable1

INTEGER(KIND=AbqIK)::variable2

to define all variables explicitely with the correct kind. This procedure does not require any changes in the environment file either.

Geralf

Registration for Indentation 2018

Tue, 2018-05-29 22:35

In reply to Next Indentation workshop (SF2M-GIME) in Liège (Belgium) in september 2018.

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Dear colleagues,

 

The next indentation symposium from the Groupe Indentation Multi-Echelle (GIME) will be held in Liège (Belgium) on 11-14 September 2018.  The conference gathers every two years, scientists and industrials concerned by the problems of mechanical characterization of surfaces. In 2018, this conference is organized by Belgian scientists: ULg, CRM Group, UCL et UMons. 

 

The programme of this not to be missed event is already available : 

Overview: http://aimontefiore.org/INDENTATION2018/index.php/program/full-overview 

Detailed programme:  http://aimontefiore.org/INDENTATION2018/openconf/modules/request.php?module=oc_program&action=program.php&p=program 

 

Do not wait too long to register, reduced rates are available until 22 June

http://aimontefiore.org/INDENTATION2018/index.php/registration 

 

Hoping to see you in Liège in September 2018.

 

Best regards

 

The Indentation 2018 organizing team

Abaqus mailing list

Tue, 2018-05-29 02:19

In reply to How to combine VUMAT an VUEOS in Abaqus

Hello

 

subscribe to and seek assistance from the

ABAQUS mailing list

https://groups.yahoo.com/neo/groups/Abaqus/info

Search the archive of the list before posting in it.

The list does not accept attachments.

 

Or 

http://www.eng-tips.com/threadminder.cfm?pid=799

or from the ResearchGate discussion forum.

 

As an introduction to subroutines get the file

http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf

 

Good luck

 

Frank

Hello dears

Fri, 2018-05-25 16:32

In reply to ABAQUS Tutorial and Assignment #1

Hello dears

I need your help

How can i model the beam for torsion in Abaqus software?and also how can i design and model a beam by GFRP shell whit the Abaqus software

Congratulations!

Tue, 2018-05-22 12:40

In reply to 2018 Warner T. Koiter Medal – Professor Taher Saif

My heartiest congratulations to Professor Saif! Well deserved!

Great book!

Mon, 2018-05-21 08:34

In reply to a new book "Contact Mechanics" from JR Barber

Hopefully I can use it as a textbook in near future.

Abaqus mailing list

Mon, 2018-05-21 06:26

In reply to Abaqus Cordinate System Rotation

Hello

 

subscribe to and seek assistance from the

ABAQUS mailing list

https://groups.yahoo.com/neo/groups/Abaqus/info

Search the archive of the list before posting in it.

Good luck

 

Frank

Hi Marco,

Sun, 2018-05-20 12:42

In reply to Very interesting idea,

Hi Marco,

Thank you for your feedback on my work. The gauge factor of our device based on graphite flakes was around 46. I could get even higher values by lowering the desnity of the coated layer (higher sheet resistance samples). However, I also had to care about high conductivity of my decive for low-voltage actuation. Therefore, there was a trade-off between gauge factor and electricual conductivty and I had to choose avarage values for both. Further information on the peformance of the stae-of-art strain sensors can be found in my recent review artilce below:

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review (https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201504755)

Best,

Morteza

Dear Xiaoyan,

Sun, 2018-05-20 09:18

In reply to Thanks for reply

Dear Xiaoyan,

Thank you for the point. The scale of PDMS with ordered substructures is limited by the mask size, so it is not easy to get large scale coating by the current technology. What we are doing now is to synthesize porous PDMS with randomly distributed pores, tuning pore size and porosity, and integrate the porous layer to smooth PDMS to realize similar MACI mechanism, see Soft Matter 10.1039/C8SM00820E. In that way, we can synthesize the the large scale coating for practical applications.

Very interesting idea,

Fri, 2018-05-18 14:38

In reply to Self‐Sensing Paper Actuators Based on Graphite–Carbon Nanotube Hybrid Films

Very interesting idea, congratulations.

We recently proposed a graphene flake ink as a strain gauge:

C. Casiraghi, M. Macucci, K. Parvez, R. Worsley, Y. Shin, F. Bronte, C. Borri, M. Paggi, and G. Fiori, “Inkjet printed 2d-crystal based strain gauges on paper,” CARBON, vol. 129, pp. 462–467, 2018. [link]

 

Have you checked how much is the gauge factor of your device, if used as a strain gauge?

Thank you very much for the

Wed, 2018-05-16 00:47

In reply to Re: Conversion of Piezoelectric coefficients

Thank you very much for the prompt response and detailed explanation. Its more clear for me now. Thanks again!

Re: Conversion of Piezoelectric coefficients

Tue, 2018-05-15 19:06

In reply to Conversion of Piezoelectric coefficients

Please see my explanation on StackExchange.  Hope that helps.

-- Biswajit

Thanks for reply

Tue, 2018-05-15 09:11

In reply to Journal Club for May 2018: Icephobic Materials

Dear Jianying,

Thank you very much for your reply. It is indeed intriguing that there exists a critical size corresponding to the optimal ice adhesion. I just read your paper which is a fantastic work. I have one more question: Can the PDMS film with sub-structures be synthesized as the large-area coating? What’s the large size of the PDMS film with sub-structures? If it works for the large-area coating, it might be widely used for the practical applications of anti-icing.

Dear Biswajith,

Tue, 2018-05-15 05:10

In reply to Re: Conversion of Piezoelectric coefficients Primary tabs

Dear Biswajith,

Thank you very much for your reply and suggestion. I have posted my question on Engineering StackExchange site. Here is the link:

https://engineering.stackexchange.com/questions/21746/conversion-of-piez...

Best regards,

John

Re: Conversion of Piezoelectric coefficients Primary tabs

Mon, 2018-05-14 20:48

In reply to Conversion of Piezoelectric coefficients

IMechanica does not allow for equations and it's hard to answer your question without a few equations.

Post your question on the Engineering StackExchange site and I'll try to answer it.

-- Biswajit

hi all

Mon, 2018-05-14 10:25

In reply to fracture energy for hashin damage evolution using Abaqus

How to get the values of Damage evolution data in Abaqus for glass/epoxy or glass Fiber Reinforced Epoxy pipes? In which publications the values could be found? handbooks? articles? reference books? Where...?? or How to calculate the values of Damage evolution data?

Dear Xiaoyan,

Sun, 2018-05-13 15:15

In reply to Exciting and inspiring review!

Dear Xiaoyan,

Thank you for the discussion. The film thickness has a significant effect on the ice adhesion strength via t-1/2. Our current results demonstrate that the PDMS without sub-substructures has a thickness dependent ice adhesion strength when increasing film thickness to around 1 mm. Above that, thickness dependency disappears (He et al, Soft Matter, 2018, 10.1039/C8SM00820E). As for optimal dimension of sub-structures, we found the holes with diameter of 1 mm and height of 3.5 μm show lowest ice adhesion 5.7 kPa, of course combining with film thickness and weight ratio of PDMS, but without lubricant oil. Further investigation of sub-structure size is needed. 

Exciting and inspiring review!

Thu, 2018-05-10 05:15

In reply to Journal Club for May 2018: Icephobic Materials

Dear Jianying,

Very exciting and inspiring review! I am very interested in your fantastic work about the macro-crack initiator (MACI) approach. In this approach, you first coated the polydimethylsiloxane film and then introduced some specific sub-structures to the film. Such sub-structure can induce the formation of macroscopic cracks between ice and film due to deformation incapability. I have two following questions about details of sub-structures,

(1) Does the film thickness affect the ice adhesion?

(2) What is the featured size of sub-structures corresponding to the optimal anti-icing?

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