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how can i measure local stress and strain in fatigue crack tip?

Submitted by uni_students2009 on

It seems that the measurment of local stress and strain in fatigue crack tip will be difficult. some researcher use F.E analysis method,in contrary using of numerical solution. however analytical method also has investigated. what method you can imagine? i need a brain storm in this issue.

 

Thank you

Hadi

Frictional Coulomb model in Abaqus

Submitted by Nicholas Fantuzzi on

Hello everybody,

I'm trying to add friction in my model.Now I have a body that is simply supported in a direction (vertical) and free to move in another one (horizontal). I want to use Coulomb friction in the horizontal direction in order to reduce displacements in that direction.

I read Abaqus User's Manual vol5 30.1.5 (frictional behavior) and I followed commands written there, but I think that works only with multiple bodies and not with a single body. I'm using Abaqus 6.7-1.

Could Someone help me?

Many many many thanks

Nicholas

Look for a research position on 1.constitutive model,failure of solid under high strain rate;2.Buckling of structure.

Submitted by Yuanxiang Sun on

CURRICULUM VITAE

Yuanxiang  Sun

Gender: Male   Date of Birth: August 21, 1967

Civil, Architectural and Environmental Engineering Department

             Missouri University of Science and Technology,Rolla, MO,65401

Science Channel Tonight at 9:00pm

Submitted by Haimin Yao on

Dear Colleagues,

May I have your attention please? It's air time for the second episode of "Popular Science's Future of...Combat".  The show will air on The Science Channel (science.discovery.com) at 9pm ET/PT on 9/07/09. The research on biological armors by Christine Ortiz's group from MIT will be reported.

Enjoy.

 

4th international confrence on Artificial intellegence

Submitted by shubhamkanungo… on

4th Indian International Conference on Artificial Intelligence (IICAI-09). IICAI-09 will be held during December 16-18 2009 in Tumkur (near Bangalore), India. IICAI is a series of high quality technical events in Artificial Intelligence (AI) and is also one of the major AI events in the world.

The effect of film thickness on the failure strain of polymersupported metal films

Submitted by Nanshu Lu on

We perform uniaxial tensile tests on polyimide-supported copper films with a strong (111) fiber texture and with thicknesses varying from 50 nm to 1 μm. Films with thicknesses below 200 nm fail by intergranular fracture at elongations of only a few percent. Thicker films rupture by ductile transgranular fracture and local debonding from the substrate. The failure strain for transgranular fracture exhibits a maximum for film thicknesses around 500 nm.

Disk vs blade natural frequencies

Submitted by cryogene on

I'm trying to determine the coorelation of a blade natural frequency and disk (nodal diameter) natural frequency on a Turbine wheel in ANSYS Modal analysis.  Is it possible for a blade natual frequency to be excited even though a disk natural frequency is not being excited??  I'm having trouble determining if a blade frequency is related to any disk nodal diameter.  Thanks for any incite on this subject.