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.

A full time opportunity is available in Schlumberger at the Houston Pressure and Sampling Product Center. Please see the attachment for details.

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Hi guys

The following is our latest work just published on Energy & Environmental Science 

Multiscale molecular simulations of the nanoscale morphologies of P3HT: PCBM blends for bulk heterojunction organic photovoltaic cells

Cheng-Kuang Lee, Chun-Wei Pao, and Chih-Wei Chu

Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan 

A postdoctoral research position is available in Dr.Katherine Yanhag Zhang’s lab in the Mechanical Engineering Department at BostonUniversity. We are looking for a self-motivated researcher to work on projectson multi-scale modeling of extracellular matrix (ECM) mechanics in vascularremodeling. The selected candidate will work on developing a predictivemechanobiology model of ECM mechanics to provide a clinical relevantrelationship between biomechanical integrity, biochemical compositionstability, and microstructure of the ECM.

Hi.

I am looking for the experimental method to determine the parameters (D1, D2, D3, D4, D5) in Johnson Cook damage criterion for steel AISI 1045. Please help me if you have any sources relative this. Thank you.

From spacecrafts to army helmets, the latest issue of SIMULIA Realistic Simulation News delivers customer success stories and industry strategy focused on Aerospace and Defense. 

Our feature article is an exciting and in-depth report on Dutch Space’s application of Abaqus in literal rocket science: virtual testing of a new metallic thermal protection system for hypersonic space vehicles.

Also in this issue:

Airbags are one of the major protection systems used in a car crash. They play one of the most important roles in preventing severe injuries and fatalities during vehicle crashes. The advancement of new technology and airbag regulations necessitates that airbags be tested for safety in all kinds of scenarios, including situations where the occupant interacts with the airbag before it is fully deployed.

Space flight re-entry vehicles need to withstand heavy impact upon landing and it is critical for engineers to understand the effects on the vehicle and the crew to ensure the safety of the mission.  In order to gain this insight, engineers need to be able to model both the space craft structure and the landing medium such as water, sand, clay, etc.