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Paris law coefficients for alumimum 5754-O and 6111-T4

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Dear all,

I am looking for the  coefficients of Paris law (C and m) for aluminum 6111-T4 and 5754-O.  Ii will be greatly appreciated if you can suggest some sources or data.

Best, 

composite materials

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Hello every body 

I am a novice (new one) on this web site and I just began, I am preparing my master on composites and I think that you have more informations than me on this subject my problem is that Iam in the coparative step between my results and the others.

my work is on the crack of composites mode II (sliding mode) I'm modelizing that phenomen with finit element to find the enegy of sustitution the problem is that I have not found any results by web and unfotunatly we have not books on this subject in my university.

composite materials

Hello every body 

I am a novice (new one) on this web site and I just began, I am preparing my master on composites and I think that you have more informations than me on this subject my problem is that Iam in the coparative step between my results and the others.

my work is on the crack of composites mode II (sliding mode) I'm modelizing that phenomen with finit element to find the enegy of sustitution the problem is that I have not found any results by web and unfotunatly we have not books on this subject in my university.

heqilin's picture

crack velocity and FGM

hi, everybody

i am going to simulate crack propagate by ABAQUS, but i haven't used ABAQUS before.
now i have two problems:
 1) can abaqus calculate the velocity of crack advancing?

 2)FGM(functionally graded materials ). material property varies at
 different position,such as density ,modulus, possion ration. can
 abaqus deal with this problem by umat .

thanks.

Coefficient of Thermal Expansion in contrained films

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Hello,

Liying Jiang's picture

A cohesive law for carbon nanotube/polymer interfaces based on the van der Waals force

A cohesive law for carbon nanotube/polymer interfaces based on the van der Waals force (JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 54 (11): 2436-2452 NOV 2006)

Authors: Jiang, L.Y., Huang, Y., Jiang, H., Ravichandran, G., Gao, H., Hwang, K.C. and Liu, B. 

Mechanical threshold stress model for 6061-T6 aluminum

Our paper on the Mechanical threshold stress (MTS) model for 6061-T6 aluminum has been accepted by JoMMS.  There are several things of interest in the paper:

1) The use of a phonon drag model to predict the sharp increase in flow stress at strain rates above 10,000 /s.  This behavior is seen in a  number of materials and is hard to fit using standard power law plasticity models.  Our model does a good job in this regard.

shirangi's picture

Interfacial moisture diffusion using cohesive zone elements

Hello every body,

As most of you know, fracture mechanics of polymer materials needs a special consideration of the viscoelastic material properties. Especially under thermomechanical loading the role of glass transition temperature T_g is very important. That is why people try to characterize the material with different methods including stress relaxation based on Time-Temperature superposition or DMA test.

Viscoelastic (generalized maxwell) model in MSC.Marc or ABAQUS

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Greetings all,

I am trying to use gerenalized maxwell viscoelastic model for polyimide polymer films (Kapton) in MSC Marc (or ABAQUS). I have never used the prony series representation of the maxwell model (hereditary integral approach). Has anyone ever used MSC Marc to incorporate the prony series relaxation to the material? or ABAQUS? Here is my game plan for doing this:

jandrade's picture

Multi-scale nature of granular media

I am happy to announce the launching of our website for the computational geomechanics laboratory at Northwestern University. Please visit the site at

http://www.civil.northwestern.edu/people/andradesite/Geomechanics%20grou...

 

Let us know what you think. 

Taxonomy upgrade extras: 
kashoo's picture

Resdiual Stressed Indentation

How can we see load dipslacement cyrve of residual stressed material. I mean I m interested in extracting indentation properties from ABAQUS for material which has got some pre stress in terms of residual stress. What is procedure of assigning residual stress to some material in ABAQUS?

shengke zhi's picture

Reduce Time

The time reduction has two methods, including hardware technique based and software technique based.

For hardware based method, you can use an independent timer to trigger off the counter to measure the number of speed pulses in a suitable frequency, such as 1MHz. In that case, the time interval you obtained is so small that it apporaches to zero.

shengke zhi's picture

Shengke's Research Blog

 Instantaneous Angular Speed (IAS) is investigated for last 10 years in Condition Monitoring. The content of IAS is coming from angular speed. If the time taken is reduced apporaching to zero, we can measure the angle travelled to extract IAS, or if the angle travelled is reduced to zero, we can measure the time elapsed to extract IAS.

A 1st step to super-strong carbon materials? 'Graphene oxide paper', Nature July 26 issue

http://tinyurl.com/2ud2wn

Long URL: (http://www.scitizen.com/screens/blogPage/viewBlog/
sw_viewBlog.php?idTheme=5&idContribution=907
&PHPSESSID=c9ee7a1c644fb35c57fab30f6e0aafdf)

The above was written for the interested layperson who wants to learn more about science. It provides some context for our manuscript that has recently appeared in Nature.

Rui Huang's picture

Research Highlight: Graphene Oxide Paper

From Northwestern Engineering:

In a paper published July 26 in the journal Nature, researchers led by Rod Ruoff, John Evans Professor of Nanoengineering in the Robert R. McCormick School of Engineering and Applied Science, report on the development of "graphene oxide paper."

Residual Stress

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The thread for residual stress analysis, measurement

ErwanVerron's picture

Recent papers on rubber mechanics

Here are some of my recent papers about mechanics of rubber material. They concern constitutive modelling, fatigue and fracture.

Marckmann G. et Verron E., Comparison of hyperelastic models for rubberlike materials, Rubber Chemistry and Technology, 79(5), 835-858, 2006.
https://www.rubber.org/MngmntWeb/NonSecure/RCTabstract.aspx?id=8214

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