Data from: Jammed frictional tetrahedra are hyperstatic
Neudecker, Max; Ulrich, Stephan; Herminghaus, Stephan; Schröter, Matthias (2013), Data from: Jammed frictional tetrahedra are hyperstatic, Dryad, Dataset, https://doi.org/10.5061/dryad.qv331
We prepare packings of frictional tetrahedra with volume fractions ϕ ranging from 0.469 to 0.622 using three different experimental protocols under isobaric conditions. Analysis via x-ray microtomography reveals that the contact number Z grows with ϕ, but does depend on the preparation protocol. While there exist four different types of contacts in tetrahedra packings, our analysis shows that the edge-to-face contacts contribute about 50% of the total increase in Z. The number of constraints per particle C increases also with ϕ and even the loosest packings are strongly hyperstatic, i.e., mechanically overdetermined with C approximately twice the degrees of freedom each particle possesses.