Poncelet coefficients of granular media

Stephan Bless, Bobby Peden, Ivan Guzman, Mehdi Omidvar, Magued Iskander

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We have developed a new technique for precise measurement of deceleration of projectiles in sand. It uses a PDV to observe the back of a sphere. Impacts were conducted up to 300 m/s, and trajectories were observed for more than 10 projectile diameters. The precise measurements allow us to calculate Poncelet parameters for spheres in dry and saturated sand and fused quartz. We find that the coefficients needed to describe the data change at about 100 m/s, and Poncelet values that give accurate estimates of deceleration will usually fail to predict ultimate penetration depth. For comparing materials, we find sand is harder to penetrate than fused quartz. Dense materials are harder to penetrate than less dense materials. Dry materials are harder to penetrate than saturated materials.

Original languageEnglish (US)
Title of host publicationDynamic Behavior of Materials - Proceedings of the 2013 Annual Conference on Experimental and Applied Mechanics
Number of pages8
StatePublished - 2014
Event2013 Annual Conference on Experimental and Applied Mechanics - Lombard, IL, United States
Duration: Jun 3 2013Jun 5 2013

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Other2013 Annual Conference on Experimental and Applied Mechanics
Country/TerritoryUnited States
CityLombard, IL


  • Granular materials
  • PDV
  • Poncelet
  • Sand

ASJC Scopus subject areas

  • General Engineering
  • Computational Mechanics
  • Mechanical Engineering


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