News Archive

Same specimen but loaded in mode II now. Fatigue precracked. Note the appearance of a small crack-tip plastic zone. The crack closes afterwards, to open under most probably a mode I wave reflection.

I can't resist sharing :-) One point impact of a fatigue precracked Ti6Al4V specimen. Filmed at 1MFps with our kirana ultra high speed camera. Note the crack opening and the characteristic plastic zones that develop rapidly. Courtesy of my grad student Tamir Albik and Dr Gleb Gil Goviazin.

to the following two former graduate students who have been selected by the Department to receive awards for excellence in research. Amit Shavit (M.Sc.), co-advised with Dr. K. Shemtov Yona will receive the Nadav Shoham award for his work on the chemistry of peri-implantitis. Dr. Gleb Gil Goviazin, co-advised with Dr. Amnon Shirizly, will receive the David and Olga Pnueli award. A real source of pride!

and some of my students presented their work in progress. Here are some pics of our posters with Yahav Boim (lattices), Yehonatan Miara (dental implants) and Sagi Aharoni (bone mechanics).
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And here is the temporary link to our new paper with Prof. Jing Xie, Dr. María González García and co-authors, about the potential lethality of waterjet riot-dispersal cannon. https://authors.elsevier.com/c/1irPe4jZMhf2w

high school students from Reali Matoss, Haifa, for a short introduction to Materials Mechanics.

in the Journal of the Mechanics and Physics of Solids, with Dr. Gleb Gil Goviazin and co-authors. In a nutshell, this study, which combines high speed photography and thermal imaging, challenges the paradigm that reactive materials' ignition results from shear, showing that normal pressure is the culprit.

It is always rewarding to see one if your papers as "most popular". Here, In Extreme Mechanics Letters, "Shock energy attenuation of liquid aqueous methylcellulose hydrogels"

at a framing rate of 400 kfps and an impact velocity of 42 m/s. Note that this is a one point impact experiment, and the initial notch is loaded parallel to its flank(s) such as to generate mode II (shear). What is interesting is that the struts that fail initially are situated opposite the notch, which fails last. So, here too, the notch (crack) plays no significant role, just as we observed earlier in mode I. Watch on YouTube / Courtesy of Yahav Boim and Dr. Amnon Shirizly.

As promised, here is a first movie of the lattice aluminum structure subjected to one-point impact (not to be confused with direct impact), at a velocity of the order of 35 m/s. A notch is machined on the right side to ensure mode I loading. The trusses that break sequentially are circled in red and the framing rate is 1 million fps, which explains that this is just the onset of fracture, as other struts break later, beyond the duration of the movie (total 180 frames using our Kirana ultra high speed camera, Specialised Imaging Limited). Courtesy of @Yahav Boim and Dr. Amnon Shirizly. Stay tune for the continuation....

Our new paper with Gleb Gil Goviazin and J. C. Nieto Fuentes is online in Experimental Mechanics. https://rdcu.be/dwQ49

Today, Ofer Honen presented his results for the M.Sc. degree in a very clear and focused presentation. Kudos! The fan club attended the meeting.
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regarding our new results on dental implants' degradation. https://youtu.be/OZlopkOwnlE  (In Hebrew)

Our paper with Gleb Gil Goviazin and Amnon Shirizly is among the most popular in Mechanics of Materials (Elsevier).
What a pleasure!

"Static and dynamic mechanical properties of wire and arc additively manufactured SS316L and ER70S6"