We are offering a PhD position within the franework of OUTCOME consortium (see attached).
The subject of the reserach is adiabatic shear banding of metallic alloys subjected to impact loading and the reserach will combine experimental and numerical work.
We are looking for a highly motivated individual with a strong background in materials science and mechanics, to sudy dynamic shear failure of metallic materials. Experience with numerical modeling required. Previous exposure to experimental work will be considered as an advantage.
Additional information can be found in the atatched description of the planned research.
Contact email: merittel [at] technion.ac.il
The attached is an invitation to submit your work to the session Prof. P.Chen (BIT) and I are coorganizing at ICEM 17.
We hope to see you there!
The sad news is that a large percentage of implants contain cracks which have the potential of causing fracture after fatigue growth. This is the outcome of the present study in which a 100 implants were examined, all apparently intact, having been extracted for various reasons, most likely biological but definitely not mechanical.
It seems that the whole field of dental implants, which is growing very fast, needs a serious mechanical re-assessment, from the design stage all the way up to surface roughening.
Comments are welcome
It is with great sorrow that I heard that our colleague from tel Aviv University, Prof. Y. Benveniste passed away recently. This is a great loss for the Israeli Mechanics Community in particular and for the community in general. I am sure he will be remembered as an exceptional scientist and a very modest and kind person.
He will be missed.
To his family, I adress my sincere condolences
D. Rittel
I came across this very instructive article, so I decided to share it here.
Enjoy!
Following an earlier post on dynamic necking of tensile bars, we show in the attached paper (to appear in JMPS) that the presence of deep notches in the specimen does not necessarily dictate the location of the neck. Various material parameters are identified and modeled numerically, to assess their respective influence. Strain-rate sensitivity is identified as an important factor.
It is commonly admitted that "rough" surfaces promote osseo-integration of dental implants. Numerous studies emphasize an optimal Ra parameter for this purpose. One very common way to achieve that state is the so-called "grit blasting" process whereby tiny ceramic (alumina) particles are shot on the implant's surface.
Up to here for the basic story.
It has also been noted in other instances that surface blasting may not be entirely beneficial and it should be controlled, in terms of blasting pressure, particle size and shape.
Contrary to the common naive feeling of clinical dentists, it so happens that dental implants can also fracture. This is a very unpleasant event which necessitates a surgical extraction procedure. So far, the most part of reserach on dental implants has been emphasizing biological failures and biocompatibility related issues. Mechanical aspects of implant design have been touched upon and a lot of work has been done on the surface condition of the implants to allow optimal osseo-integration. Those are all central clinical issues.
