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Change of basis for deviatoric second order tensors

Dear mechanicians
 
I remember reading somewhere that someone had a proof of the following:
Given a deviatoric/traceless second order tensor it is possible to find a basis for which all the normal/direct components equal zero.
For 2d this is easy: a basis rotated 45deg wrt. the eigenbasis.
The proof concerned 3d and it may have been Gurtin that had it in one of his books (sometihng tells me "The Linear Theory of Elasticity" (1972) as I don't have access to this one), but I'm not certain.
 
Can anyone help me in this matter?

Thermomechanical coupled simulation

Hi all,

 

I am trying to input a termperature field as initial conditions in
abaqus, to use the temperature distribution from a previous temperature
simulation in an mechanical simulation. But when I check the Temperature
values in the mechanical simulation i get great differences between the
nodal values (NT) and the element values (TEMP).

Does anybody know the reason of this problem?

 

Can it be related to the element typ? So the TEMP values are the avereged values from NT?

 

Kind regards!

Thermomechanical coupled simulation

Hi all,

 

I am trying to input a termperature field as initial conditions in
abaqus, to use the temperature distribution from a previous temperature
simulation in an mechanical simulation. But when I check the Temperature
values in the mechanical simulation i get great differences between the
nodal values (NT) and the element values (TEMP).

Does anybody know the reason of this problem?

 

Can it be related to the element typ? So the TEMP values are the avereged values from NT?

 

Kind regards!

Thermomechanical Simulation

Hi all,

 

I am trying to input a termperature field as initial conditions in abaqus, to use the temperature distribution from a previous temperature simulation in an mechanical simulation. But when I check the Temperature values in the mechanical simulation i get great differences between the nodal values (NT) and the element values (TEMP).

Does anybody know the reason of this problem?

 

Can it be related to the element typ? So the TEMP values are the avereged values from NT?

 

Kind regards!

Stephen Juhasz died on 19 June 2013 at the age of 99.

Stephen Juhasz died on 19 June 2013 at the age of 99. The following brief description of Juhasz's career was provided by Norm Abramson.

Juhasz received his Dip. Ing. From Budapest Technical University in 1936; Teknologie Licensiate (doctorate) from the Royal Institute of Technology, Stockholm, Sweden in 1951; and an Honorary Doctorate of engineering from Budapest Technical University in 1989.

Hanqing Jiang's picture

Professor Yonggang Huang receives 2013 ASME Daniel C. Drucker Medal

Congradulations to Professor Yonggang Huang to receive 2013 ASME Daniel C. Drucker Medal for his "fundamental and applied contributions to mechanics of materials and structures across multiple scales." The Daniel C. Drucker medal was established in 1997 and is conferred in recognition of distinguished contributions to the field of applied mechanics and mechanical engineering through research, teaching and service to the community over a substantial period of time. 

Here is a list of DANIEL C. DRUCKER MEDALISTS

Frederick A. Leckie died at age of 84

We are deeply sorry to report that Fred Leckie died on Friday, 14 June 2013, at the age of 84.  A brief description of Fred's career is contained in the 2000 ASME Materials Division Newsletter, when Fred received the Nadai Medal.

Mike Ciavarella's picture

sad news for mechanician. Departure of HD Bui, member of french academy of science

Unfortunately, HD Bui, 76, passed away yesterday evening. An elegant, dedicated, very discreet but bright mind, HD Bui made a long career at Ecole Polytechnique and EDF, making important contributions in fracture mechanics and inverse engineering.  Lately, he returned to work on his interesting contributions on the Cheops pyramid and the spiralling internal structure.

He was considered the most prominent vietnamese scientist in France, of 400 000 living there.

retrodynamic's picture

Novel Rotary-Turbo-InFlow Tech - Gearturbine Project - Featured Development - Atypical Type

-Atypical - Gearturbine = Retrodynamic Dextrogiro VS Levogiro Effect - Ying Yang Thrust Way Type - Non Waste Looses. State of the Art, Innovative concept Top System, Higher Efficient Percent.

 

-Its Similar simple system, of the Heron`s Aeolipile Steam Turbine Device, from Alexandria; 10-70 AD.

 

-8/XY Thermodynamic Cycle way Steps.

 

-New Form-Function Motor Engine Device Type. 

 

-Retrodynamic = Rotor/RPM VS InFlow Way = Collision interaction type.

 

retrodynamic's picture

Novel Rotary-Turbo-InFlow Tech - Gearturbine Project - Featured Development

Choose a channel featured in the header of iMechanica: 

 

Atypical Gearturbine - Retrodynamic Dextrogiro vs Levogiro Effect - Ying Yang Thrust Way - Non waste Looses. State of the art innovative concept top system higher efficient percent.

Its similar system, of the Aeolipile device, 10-70 AD.

8-XY ThermodynamicCycle way steps.

New Form-Function Motor Engine Device Type.

Rotor RPM vs InFlow way / Collision interaction type.

Non parasitic looses for; cooling, lubrication, combustion, systems.

Need help about VDLOAD (Umat file) for abaqus

Hello all

I have a problem with my VDLOAD file for abaqus.

My vdload.for file is:

Dibakar Datta's picture

Professor Rod Clifton to Receive Sigma Xi Monie A. Ferst Award

Rod Clifton , Rush C. Hawkins University Professor Emeritus and Professor (Research) at the School of Engineering at Brown University, has been selected as the winner of the 2013 Sigma Xi Monie A. Ferst Award .

MSC.MARC (HYPELA2)

Choose a channel featured in the header of iMechanica: 

Dear Marc specialist users Colleague:

I am developing an user material subroutine (HYPELA2) in Msc Marc (Marc Mentat2012.1.0, Windows platform, 64bit).
I am trying to make a write inside in Hypela2.f routine, but it doesn't work.
I have used the file number unit 6, for example,  write(6,*) ' Hello' , but
no any results in the standard output file. Otherwise, the Hypela2 works properly.
Does anyone have any suggestions how can I write out any data from Hypela2.f?
Thanks.

Leslie

Tian Zhi Luo's picture

6 CDs in cell mechanics(mechanobiology)

There are six distinguished biophysicist in cell mechanics field (their research interests cover much broader areas) and the abbreviations of their first names are either C or D. They are Dr. David Weitz (Harvard U.), Dr. Christopher Chen (U. Penn.), Dr. Dennis Discher (U. Penn.), Dr. Denis Wirtz (JHU), Dr. Douglas Robinson (JHU), and Dr. Daniel Fletcher (U.C. Berkeley). These six scientists use both experimental and theoretical approaches to investigate the biological responses of proteins and cells to mechanical stimuli, such as forces and geometrical constraints. Their research extends from molecular scale to cellular level to tissue level.

link 8, introduced tensile curve and compression curve

Hi.

I'm working  with the element link8 (Ansys 12.1) and I have to
introduced the tensile curve and compression curve, but I don't know,
How I have to introduced its???

 

I have worked with the comands: TB: aniso, miso,..., I think the best
option is: TB, user, but How I have to introduced the values of tensile
and compression curve?, when this are different.

 File attachment is the tensile and compression curve to introduce

Thank you, Toni 

Michael Ortiz and David Hibbitt are elected to the US National Academy of Engineering

Today, February 7th, the NAE is announcing the election of 69 new members and 11 new foreign associates. The public announcement will be issued at 10:00 a.m. (EST) and will be posted on the NAE website.

Congratulations to Michael Ortiz and David Hibbitt!

Pradeep Sharma's picture

Vicky Nguyen and Kaushik Dayal are Recipients of the Inaugural Eshleby Mechanics Award for Young Faculty

It gives me great pleasure to announce the outcome of the inaugural competition for the Eshelby Mechanics Award for Young Faculty. This award, created in 2012, will be annually given to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. The selection committee consisted of: K. Ravi-chandar (UT Austin), Huajian Gao (Brown University), Kaushik Bhattacharya (Caltech), Roger Fosdick (Minnesota University), and Yonggang Huang (Northwestern University).

radial reynolds number

Hello,

I am working in a fluid mechanics theme. Do anybody now something about the Radial Reynolds Number

Thank you. 

saberelarem's picture

Fractal surface mesh generation

Choose a channel featured in the header of iMechanica: 

I would like to know a suitable way to generate meshs for fractal surfaces and export them to be used in FEM computations.

Thank you for any help.

curvature tensor

Could someone explain me what do the curvature tensor mean at surface structures?

THX for the help!

I want to combine XFEM and UMAT(about concrete) in ABAQUS

DEAR everyone :

    I want to  combine XFEM and UMAT(about concrete) in ABAQUS,I have some questions about this ,concrete is a Special materials and I have the Constitutive equation about concrete ;Can I use the new constitutive equation and  simulate mixed CONCRETE cracking by XFEM(UEL_XFEM) in ABAQUS,how to combine UEL and UMAT in abaqus, thanks in advance,or you can Recommend  some relative infomation for me  

Yonggang Huang's picture

Journal of Applied Mechanics Award

The Journal of Applied Mechanics Award is provided by the Applied
Mechanics Division of the American Society of Mechanical Engineers to honor the
best paper which has been published in the Journal of Applied Mechanics during
the two calendar years immediately preceding the year of the award. The award
will be made annually to the corresponding author of the paper who received their
Ph.D. no more than 10 years prior to July 1 of the year of award. Corresponding
authors who have yet to receive a Ph.D. may also be considered. The award will

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