seminars@itp.ac.ru
To subscribe or unsubscribe via the World Wide Web, visit
https://mailman.itp.ac.ru/mailman/listinfo/seminars
or, via email, send a message with subject or body 'help' to
seminars-request@itp.ac.ru
You can reach the person managing the list at
seminars-owner@itp.ac.ru
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Seminars digest..."
Today's Topics:
1. Friday 25.03.2022 (Serge Krashakov)
----------------------------------------------------------------------
Message: 1
Date: Wed, 23 Mar 2022 19:09:25 +0300
From: Serge Krashakov <sakr@itp.ac.ru>
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Friday 25.03.2022
Message-ID: <2a919f70-7990-9876-0638-30564db5b89b@itp.ac.ru>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Уважаемые коллеги!
На заседании Ученого совета в пятницу 25 марта в 11:30 будет заслушан
доклад:
Наиль Иногамов
*Attenuation and inflection of initially planar shock wave generated by
femtosecond laser pulse*
Evolution of wavefront geometry during propagation and attenuation of
initially planar shock waves generated by femtosecond laser pulses in
aluminum is studied. We demonstrate that three stages of shock front
inflection take place in consistent hydrodynamics and molecular dynamics
simulations. During the first stage, the distance traveled by a
near-planar wave DSW ≲ RL is smaller than the radius of heated laser
spot RL. Wave attenuation is associated with one-dimensional plane (1D)
rarefaction wave coming from the free surface. Such rarefaction wave
shapes the shock wave to a 1D triangular pressure profile along
direction normal to target surface with a shock front followed by an
unloading tail. The second transitional stage starts after propagation
of DSW ∼ RL, at which the unloading lateral waves begin to arrive to a
symmetry axis of flow and initiate inflection of the initially planar
shock front. Next at the third stage, the wavefront geometry is finally
rounded and rapid attenuation of shock pressure begins at DSW ≳ RL. It
is shown that such divergent shock wave cannot generate plastic
deformations in aluminum shortly after propagation of DSW ∼ RL. Thus, we
may estimate the maximal peening depth as a radius of focal spot, which
sets an upper limit for the laser shock peening. The cessation of
plastic deformation is caused by the fall of the shockwave amplitude
below the elastic limit. In this case, the elastic-plastic wave
transitions to a purely elastic mode of propagation. For large-sized
light spots, this transition ends in the 1D mode of propagation.
ID и пароль онлайн-трансляции в Zoom те же, что и для предыдущих
трансляций докладов на Ученом совете:
https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09
Meeting ID: 968 9936 4518
Пароль: 250319
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.itp.ac.ru/pipermail/seminars/attachments/20220323/509fa37f/attachment-0001.htm>
------------------------------
Subject: Digest Footer
_______________________________________________
Seminars mailing list
Seminars@itp.ac.ru
https://mailman.itp.ac.ru/mailman/listinfo/seminars
------------------------------
End of Seminars Digest, Vol 42, Issue 4
***************************************
