Blog posts

The indentation of pressurized elastic shells: from polymeric capsules to yeast cells - D.Vella, A.Ajdari, A.Vaziri & A.Boudaoud

Submitted by Amin Ajdari on Mon, 08/15/2011 - 20:03

Pressurized elastic capsules arise at scales ranging from the 10 m diameter pressure vessels used to store propane at oil refineries to the microscopic polymeric capsules that may be used in drug delivery. Nature also makes extensive use of pressurized elastic capsules: plant cells, bacteria and fungi have stiff walls, which are subject to an internal turgor pressure. Here, we present theoretical, numerical and experimental investigations of the indentation of a linearly elastic shell subject to a constant internal pressure.

Elastic Modulus vs Hardness.

Submitted by Zartasha Mustansar on Mon, 08/15/2011 - 15:51

research

Dear All.

May I please ask what is the relationship between Elastic modulus and hardness. Is it a direct relationship? i.e. higher the hardness, higher the elastic modulus.

Also, how could we interpret this relationship in materials like living bones?

Many thanks

Zartasha

cyclic loading

Submitted by danielteruna on Sat, 08/13/2011 - 03:44

Hi all,

I am very appreciate if any one can help me to explain how to get hysteretic cuve using abaqus.

I have tried a cantilever plate subjected to cyclic loading but when I saw the graphic desplacement vs load,

did not show a hysteresis loop. I input the data of material (stress and plastic strain in isotropic hardening), because when I chose kinematic hardening

the program did not run. It may be the data is not completely.

Thank you for your help

regard

daniel

I am looking for a Post-doc position

Submitted by aaam on Fri, 08/12/2011 - 23:03

job

I am looking for a post-doc position.

My current research interests includes robotics, mechanical vibration, robust control, modeling and control of conjugated polymer actuators for application in micro manipulation systems.

please do not hesitate to contact me

email: amirali1211982 [at] yahoo.com

Lithiation-Induced Embrittlement of Multiwalled Carbon Nanotubes

Submitted by Jianyu Huang on Fri, 08/12/2011 - 21:52

ACS Nano, 2011, DOI: 10.1021/nn202071y

In situ TEM electrochemistry of anode materials in lithium ion batteries

Submitted by Jianyu Huang on Fri, 08/12/2011 - 21:43

Xiao Hua Liu and Jian Yu Huang, Energy Environ. Sci., 2011, DOI: 10.1039/C1EE01918J

Aerospace Customer Papers featuring SIMULIA Solutions

Submitted by matt.ladzinski on Fri, 08/12/2011 - 18:42

Our Aerospace sector boasts an extraordinary amount of dedicated customers that produce high-quality conference papers year after year on their use of SIMULIA solutions. The papers provide extensive and in-depth coverage of the industry’s most popular topics: aircraft design, structural analysis, landing gear, composite testing, bird-strike and more. Download these select papers from the 2011 SIMULIA Customer Conference to learn more on how industry-leading companies such as Airbus, EADS, and Rolls-Royce Deutschland use Abaqus and Isight.

Influence of Material Ductility and Crack Surface Roughness on Fracture Instability

Submitted by arash_yavari on Fri, 08/12/2011 - 17:18

research

fractal crack

Westergaard stress functions

subcritical crack growth

fracture instability

This paper presents a stability analysis for fractal cracks. First, the Westergaard stress functions are proposed for semi-infinite and finite smooth cracks embedded in the stress fields associated with the corresponding self-affine fractal cracks. These new stress functions satisfy all the required boundary conditions and according to Wnuk and Yavari's embedded crack model they are used to derive the stress and displacement fields generated around a fractal crack.