  In this article, I study the shear thickening of suspensions of frictional
dimers by the mean of numerical simulations. I report the evolution of the main
parameters of shear thickening, such as the jamming volume fractions in the
unthickened and thickened branches of the flow curves, as a function of the
aspect ratio of the dimers. The explored aspect ratios range from $1$ (spheres)
to $2$ (dimers made of two kissing spheres). I find a rheology qualitatively
similar than the one for suspensions of spheres, except for the first normal
stress difference $N_1$, which I systematically find negative for small
asphericities. I also investigate the orientational order of the particles
under flow. Overall, I find that dense suspensions of dimeric particles share
many features with dry granular systems of elongated particles under shear,
especially for the frictional state at large applied stresses. For the
frictionless state at small stresses, I find that suspensions jam at lower
volume fraction than dry systems, and that this difference increases with
increasing aspect ratio. Moreover, in this state I find a thus far unobserved
alignment of the dimers along the vorticity direction, as opposed to the
commonly observed alignment with a direction close to the flow direction.
