The sintering of non-cohesive particles is examined via granular dynam
ics techniques. In particular, the relevance of percolation theory to
the sintering process is examined and it is shown that directed percol
ation may provide an adequate description at the sintering threshold f
or nearly spherical particles. Furthermore, the external force needed
to overcome a material dependent sintering threshold, theta, is shown
to increase linearly with theta. The stresses inside a compressed gran
ular medium is shown to be fractally distributed with the total stress
S in a volume l2, growing like S approximately l(alpha), where alpha
almost-equal-to 1.89 +/- 0.02. Finally, the influence of non-spherical
particles is shown to be largest when the external stresses are small
est.