D.Rittel's blog

http://physicsbuzz.physicscentral.com/2020/02/how-metal-responds-to-stri...

All invited to submit an abstract to this conference, one of the best in the field, in the long tradition of BSSM Conferences

8th - 10th September 2020, St Anne's College, University of Oxford, UK.

The 15th in a series of conferences organised by the British Society for Strain
Measurement showcasing novel and innovative research in Experimental Mechanics.

Abstract submission deadline 28th February 2020    

Please don't forget to submit your abstract until Jan. 10th. The deadline is approaching!

Dear Colleagues:

As many of you may know, the International Conference on Theoretical and Applied Mechanics (ICTAM) will be held in Milano next year (https://www.ictam2020.org).

Professor Kikuo Kishimoto and I are co-organizing a thematic session on:

SM07 Impact Mechanics and Wave Propagation

A small steel sphere is launched at 153 m/s through a water tank. This is a nice visualization of cavity expansion ion a fluid. Note the rebound as the sphere bounces back and hits the water tank again.

The movie exceeds the 20Mb limit, sio it is available on youtube:

https://www.youtube.com/watch?v=Ihgmp9mlUc8&list=PLTzO8_nj5CcIKB0Qc1ssHH...

Shock attenuation is of prime concerns when bodily organs are involved, such as traumatic brain injury. Most armor systems nowadays are aimed at defeating the threat, such as breaking a projectile using hard ceramic armor. Yet, such solutions do not mitigate the initial acceleration (elastic) wave that is responsible for internal organ damage, although no penetration occurred.

The Taylor-Quinney coefficient is universally understood as a manifestation of the stored energy of cold work, and one therefore assumes a one to one correspoindence between its value and the microstructural state of the deformed material. In the attached letter (to appear in Phys Rev Letters), we question this assumption by bringing new experimental evidence that the thermomechanical conversion is a function of the kinetics of the process and not of the final microstructure only.

The coming ICTAM will be held in Milan, August 23-28, 2020.

Professor K. Kishimoto and myself have been mandated by the Chairs to organize the following  thematic session:

SM07 Impact Mechanics and Wave Propagation

We hereby invite our colleagues to submit their abstract and make this session a real success!

Dany and Kikuo

Aqueousmethylcellulose solutions are fascinating inverse-freezing materials, known to reversibly form gels upon heating. Recently, these materials have been found to undergo this endothermic solidification upon impact. The imapct-induced solidification was shown to occur in the microseconds’ timescale,  setting the path for examining their functionality for shockabsorption purposes.

All invited to attend a promising conference on defence-related topics, in the broad context of the subject:

http://www.icdt-conf.com/?page=%2Fevent%2F1864384&

Dental implants are increasingly being placed for edentulous patients worldwide. While the clinical aspects of the implants are extensively investigated, engineering considerations of the implant as a functional structure subjected to ill-defined boundary conditions are less considered. A recent trend is to consider all ceramic implants as an alternative to the classical titanium-based implants.

Conclusions

Checking upon the status of a submitted paper that has been with the journal for 2 weeks, we received the following response.

I will let you judge.....

The attached, to appear in I.J. Impact Engng., is an attempt to simplify such very complex calculations using an incubation time concept for defects coalescence, in the spirit of Tuler and Butcher and others.

By comparing the calculations and the experiments, it seems that the approach works nicely, produces realistic results, and most of all does not necessitate complex models with too many parameters of very sophisticated FE formulations.

Enjoy

Not too long ago, we identified dynamic recrystallization (DRX) as a potentially softening factor leading to the formation of adiabatic shear bands. However, the exact nature and the extent of the softening effect till remained to be assessed. The link to our new paper provides additional information on this issue.

http://www.nature.com/articles/srep37226

(the paper is also attached)

All welcome!

https://www.facebook.com/The-Dynamic-Fracture-Laboratory-DFL-35936047778...

D. Rittel

We are offering a PhD position to start this coming september at technion, Haifa, Israel, as advertised in the attached file.

To qualify, the candidates should hold an M.Sc. with thesis in mechanical/materials engineering and have passed the GRE with a grade of 85% or more.

The research will be experimental and numerical in character.