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Safety Factor and Material Factor or Amod, what is the difference?

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Hello, everyone! When talking about allowable stress, Safety Factor is introduced. While in offshore engineering, there are allowable stress modifier in API and material factor in NPD. So what is the difference between safety factor and allowable stress modifier or material factor? Are they used in special load conditions?

You help will be appreciated. Many thanks! 

Ares Rosakis's picture

Ares Rosakis, Chair of the Executive Committee of the Applied Mechanics Division, ASME

Awards will be presented at the AMD Banquet, scheduled on Tuesday, 13 November 2012, during the ASME International Mechanical Engineering Congress and Exposition, to be held in Houston, Texas, 9-15 November 2012 at the Hilton Americas and the George R. Brown Convention Center.

 2012 Society Awards:

residual stress and strain definitions (through-thickness) in ABAQUS/Explicit

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Hello everyone,

 

I need some help regarding the definition of initial residual stresses and plastic strains in a shell finite element (S4R) model in ABAQUS/Explicit.

I have determined the residual stress distributions and initial plastic strains and I need to assign these distributions to a given element set.

I understand I should be looking at:

*INITIAL CONDITIONS, TYPE=STRESS

 ELSET_A, S11, S22, S33

total solution time in dynamic explicit analysis

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Hello,

 I'd like to know how the computation time depends on the element number in a model (dynamic explicit analysis in Nastran). When I work with a simple model which has a rather coarse mesh the function is linear, so 10 steps with the increment 0.001 is equivalent to 100 steps with the increment 0.0001. But I don't know how this dependency will evaluate if I build a much more complex model. Maybe it will be exponential?

Thank you

question

hi....I have one question...it is: what is the minimum weight of a water droplet pending on the roof that it will fall down....my question is this ...shall we use both ΔP and surface tension for the solution??? plz guid me....thanks

 

soheilesm@yahoo.com

 

Bird strike on engine fan blade

Good afternoon all,

I am doing bird strike analysis on engine fan blade,I have used lagrangian simulation for this model,very high plastic strain are coming. please suggest  how to retify it and if any one have example problem of bird strike(.k file) please share it 

Regards,

Nizam

Subra Suresh elected to the National Academy of Sciences

Dr. Subra Suresh, material scientist and the Director of the National Science Foundation, is elected to the US National Academy of Sciences.  He is iMechanica user 190.  Congratulations!

damage to the adhesive

Hi

I work  on the damage to the adhesive.

in a abaqus please ,after viewing the results how to calculate the damage surface of the adhesive (damage rate).

thank you in advance

Mhamdia.R 

zidane611's picture

The ANAND model in ABAQUS.

Hi, all

   I am a newer with ABAQUS. I have to simulate mechanics of a new material with ANAND model.

   I want to know whether a built-in ANAND model was in ABAQUS6.91 right now. And how to use it? I have seen in somewhere that someone said ABAQUS 6.5 had built ANAND model, but I don't find any information about ANAND model in ABAQUS6.91 I am using now.

   I hope you can tell me something about it.

   Thank you very much.

 

zidane 

hello ,everyone ,ask for thermal extended finite element crack growth or thermal extended finite element program code .

hello , i am new for xfem ,i want to simulate crack growth with thermal load using xfem ,have some one know what website has free thermal xfem or thermelastic xfem code ? or can send me to z770428@126.com , material is arbitrary , 2Dor 3D , THANK YOU

 YOUR S

 HONGGANG 

Alejandro Ortiz-Bernardin's picture

Professor Yannis F. Dafalias to Receive the 2012 Nathan M. Newmark Medal from ASCE

The American Society of Civil Engineers has awarded the 2012 Nathan M. Newmark Medal to Yannis F. Dafalias, a professor of Civil and Environmental Engineering at UC Davis. The award honors Dafalias’s research in plasticity of metals and soils, finite elastic-plastic deformations, inherent and evolving anisotropy, and structural optimization.

See complete post

periodic boundary conditions

Dear all,

i have implemented the periodic boundary conditions in x-directon for my simple model. In the screed i see the moement of the body in x direction. I think it is not correct. Should be additional boundary conditions be applied? Whichones?

Best regards

ABAgirl

profilometer's picture

Scanning Valves Efficiently And Precisely Is Often A Nightmare

PROFILOMETER

Traditional ways of valve inspection using a contact profilometer are making way for the more recent non contact valve inspection technologies. Even though many of the specs of surface roughness globally are set as per the findings by a contact profilometer the ease of non-contact inspection systems plus the speedier technique of employing the high tech valve inspection technologies are definitely behind why significantly more professionals are purchasing the newest non-contact profilometer.

Great things about a customized valve inspection set-up

need a johnson-cook plasticity model umat in abaqus

I need a johnson-cook plasticity model umat in abaqus。Any help will be appreciate。thanks

Mary Boyce and Huajian Gao elected to the National Academy of Engineering

National Academy of Engineering Elects

66 Members and 10 Foreign Associates

                   WASHINGTON — The National Academy of Engineering (NAE) has elected 66 new members and 10 foreign associates, announced NAE President Charles M. Vest today. This brings the total U.S. membership to 2,254 and the number of foreign associates to 206.

Jizhou Song's picture

Professor David Barnett to Receive the A.C. Eringen Medal from SES

Professor David Barnett of Stanford University will receive the A.C. Eringen Medal from the Society of Engineering Science (SES). The prize is awarded in recognition of sustained outstanding achievements in Engineering Science. Professor Barnett will receive his award during the 49th Annual Technical Meeting of the Society of Engineering Science to be held at Georgia Institute of Technology from October 9-12, 2012.

Jizhou Song's picture

Professor Markus J. Buehler to Receive the 2012 SES Young Investigator Medal from SES

Professor Markus J. Buehler of MIT will receive the 2012 SES Young Investigator Medal from the Society of Engineering Science (SES).

Ting Zhu's picture

Professor Zhigang Suo to Receive the William Prager Medal from SES

Professor Zhigang Suo of Harvard University will receive the the William Prager Medal from the Society of Engineering Science  (SES). The award is made in recognition of his outstanding research contributions in Solid Mechanics. Professor Suo will receive his award during the 49th Annual Technical Meeting of the Society of Engineering Science to be held at Georgia Institute of Technology from October 9-12, 2012.

Huajian Gao's picture

Professor Kyung-Suk Kim to Receive Engineering Science Medal from SES

Professor Kyung-Suk Kim of Brown University will receive the 2012 Engineering Science Medal from the the Society of Engineering Science (SES). The prize, which consists of a plaque and a check for $2000, is awarded in recognition of a singularly important contribution to Engineering Science.  Professor Kim will receive his award during the 49th Annual Technical Meeting of the Society of Engineering Science to be held at Georgia Institute of Technology from October 9-12, 2012.

2012 BENJAMIN FRANKLIN MEDAL IN MECHANICAL ENGINEERING

2012 BENJAMIN FRANKLIN MEDAL IN MECHANICAL ENGINEERING

Zvi Hashin, Ph.D. 
Tel Aviv University
Tel Aviv, Israel 

Citation: For groundbreaking contributions to the accurate analysis of composite materials, which have enabled practical engineering designs of lightweight composite structures, commonly used today in aerospace, marine, automotive, and civil infrastructure.

Jizhou Song's picture

Professor Huajian Gao is awarded the Rodney Hill Prize 2012

The Rodney Hill Prize for 2012 is awarded to Professor Huajian Gao of Brown University, USA. 

This prize, which consists of a plaque and a check for $25,000 (twenty-five thousand US Dollars), is to be awarded in recognition of outstanding research in the field of solid mechanics. The prize is to be awarded every 4 years, to coincide with the quadrennial International Congress of Theoretical and Applied Mechanics (ICTAM). The first prize was awarded at ICTAM 2008 in Adelaide.

Francis Charles Moon named the 2012 Thomas K. Caughey Dynamics Award Winner

Francis Charles Moon is named the 2012 Thomas K. Caughey Dynamics Award Winner.

The Thomas K. Caughey Dynamics Award was established in 2008 and is conferred in recognition of an individual who has made significant contributions to the field of nonlinear dynamics through practice, research, teaching, and/or outstanding leadership.

David J. Benson named the 2012 Ted Belytschko Applied Mechanics Award Winner

David J. Benson is named the 2012 Ted Belytschko Applied Mechanics Award Winner.

The Applied Mechanics Award was established in 1988 by the ASME Applied Mechanics Division. The Award was renamed the Ted Belytschko Applied Mechanics Award in 2008. The Award is given to an outstanding individual for significant contributions in the practice of engineering mechanics; contributions may result from innovation, research, design, leadership or education.

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