University of Cambridge > Talks.cam > BSS Formal Seminars > Shocks in fragile matter

  Browse A-Z

Log in

Cambridge users (raven)details Other usersdetails No account?details

Information on

Subscribing to talksdetails Finding a talkdetails Adding a talkdetails Disseminating talksdetails Help and Documentationdetails

Shocks in fragile matter

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Tracy Inman.

Non-linear sound is an extreme phenomenon typically observed in solids after violent explosions. But granular media are different. Right when they unjam, these fragile and disordered solids exhibit vanishing elastic moduli and sound speed, so that even tiny mechanical perturbations form supersonic shocks. Here, we perform simulations in which two-dimensional jammed granular packings are continuously compressed, and demonstrate that the resulting excitations are strongly nonlinear shocks, rather than linear waves. We capture the full dependence of the shock speed on pressure and compression speed by a surprisingly simple analytical model. We also treat shear shocks within a simplified viscoelastic model of nearly-isostatic random networks comprised of harmonic springs. In this case, anharmonicity does not originate locally from nonlinear interactions between particles, as in granular media; instead, it emerges from the global architecture of the network. As a result, the diverging width of the shear shocks bears a nonlinear signature of the diverging isostatic length associated with the loss of rigidity in these floppy networks

This talk is part of the BSS Formal Seminars series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

Other lists

shubham Meeting the Challenge of Healthy Ageing in the 21st Century Category Theory Seminar

Other talks

A new proposal for the mechanism of protein translocation RA250 at the Fitz: academicians celebrating 250 years of the Royal Academy The role of transcription factors in cancer SciBarHealth: Heart Month Undersampling in physical imaging inverse problems Towards bulk extension of near-horizon geometries The role of myosin VI in connexin 43 gap junction accretion The Global Warming Sceptic Cambridge-Lausanne Workshop 2018 - Day 1 PTPmesh: Data Center Network Latency Measurements Using PTP C++ and the Standard Library
 

© 2006-2024 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity