Hertz beyond belief
2014 (English)In: Soft Matter, ISSN 1744-683X, Vol. 10, no 13, 2264-2269 p.Article in journal (Refereed) Published
We examine the validity of Hertz's linear elastic theory for central collisions of spheres using a viscoelastic model. This model explains why Hertz's theory is accurate in predicting the collision time and maximum contact area even when 40% of the kinetic energy is lost due to viscous dissipation. The main reason is that both the collision time and maximum contact area have a very weak dependence on the impact velocity. Moreover, we show that colliding objects exhibit an apparent size-dependent yield strength, which results from larger objects dissipating less energy at a given impact velocity.
Place, publisher, year, edition, pages
2014. Vol. 10, no 13, 2264-2269 p.
Restitution Coefficient, Elastic Solids, Granular Gases, Impact, Collision, Contact, Spheres, Energy, Ice, Strength
IdentifiersURN: urn:nbn:se:kth:diva-144013DOI: 10.1039/c3sm53063aISI: 000332478800019ScopusID: 2-s2.0-84896759180OAI: oai:DiVA.org:kth-144013DiVA: diva2:709991
FunderSwedish Research CouncilThe Wenner-Gren Foundation
QC 201404042014-04-042014-04-042014-04-04Bibliographically approved