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About the Fatigue strength definition for some specific metal-product

Submitted by Zhang Yanzhuo on

Is there anyone familiar with the S-N curve when dealing with Fatigue test?

S is the stress,σ? For a specific load, isn't it some stress distribution in the test coupon? How do somes testbooks or some industrial standards use only one stress as an element to describe the material or some metal products' fatigue strength? I executed the fatigue test for some metal-products by the load-controlled servo-hydraulic tig. I have some (load,life)points on the S-N coordination,e.g.(7.2KN,258910cycles),(6.0KN,10000000cycles) .

Professor Z. U. A. Warsi passes away . . .

Submitted by Rani W. Sullivan on

Zahir Warsi, Professor Emeritus of Aerospace Engineering at Mississippi State University passed away on December 3, 2008.

Author of Fluid Dynamics:  Theoretical and Computational Approach (CRC Press), eminent scholar and scientist, his obituary can be found on the website of the American Academy of Mechanics:

http://www.aamech.org/obituary.html.

 

Why Griffith's Law of fracture does not hold at the nanoscale

Submitted by Ashfaq Adnan on
research

We know from fracture mechanics theories that fracture instability in a perfectly brittle material occurs when energy release rate (G) becomes equal or more than two times the surface energy (γ) of that material. The value of G = 2γ is known as fracture toughness Gc. This is the classical Griffith criteria of brittle fracture. Experimentally, however, we know that plasticity becomes eminent for most materials and this criteria does not work.

Einstein's birthday, the PI day

Submitted by Pi-Gang Luan on
opinion

The day before yesterday, Mar. 14 (3.14), was a great date, because Albert Einstein was born at the same day 130 years ago.

I and my wife enjoyed a very good holiday that day in Taipei. Most interestingly, we found a vivid statue of Einstein made by Ju Ming, stood still in front of the Chen-Ping (eslite) bookstore.

We took several photos around this statue. Here I share one of them with you.

Assigning two material behavioour to a beam

Submitted by manoochehr on

Hi Everyone,

I am quite new to this blog, and I enjoy of studying your comments. I have a problem in ABAQUS/CAE. I am trying to model a wood beam that has two beahviour in tension and compression. Elasto-Plastic behaviour in tension and in compression Elsto-Brittle behaviour. Is there any way to model this material in ABAQUS. My problem mainly comes back to this case that we can not assign to a beam two materail behaviour simultanously.

Thank you for your reply.

Manoochehr 

Looking for a Postdoctoral/Research Associate Position

Submitted by Nishantkumar on
job

Dear Sir/Madam,

I have recently (Fall–08) completed my Ph.D. in mechanical engineering with specialization in general areas of nonlinear structural dynamics and model order reduction. If any Prof. or research organization has an opening for a postdoc position in the areas of my technical expertise, please let me know at kumarnish [at] hotmail.com (kumarnish[at]hotmail[dot]com).

Thanks,

Nishant

Finite Deformation: Special Cases

Submitted by Zhigang Suo on
education
ES 240
solid mechanics
ES 241
Advanced Elasticity
Spring 2009
Spring 2011
Spring 2013

The notes on finite deformation have been divided into two parts: special cases and general theory (node/538). In class I start with special cases, and then sketch the general theory. But the two parts can be read in any order.

Abaqus embedded truss problem

Submitted by hmousad on

Hello,

 I'm trying to model a hollow pipe that have inside a 3D truss element. I've embedded the truss upper part in that cube shown in the picture attached.

The problem is when I apply lateral force what happens is that the bar just don't follow the pipe in its motion. The last mesh element in the embedded part isn't attached anymore to the upper cube.

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