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We investigate the mechanical response of jammed packings of circulo-lines,interacting via purely repulsive, linear spring forces, as a function ofpressure $P$ during athermal, quasistatic isotropic compression. Prior work hasshown that the ensemble-averaged shear modulus for jammed disk packings scalesas a power-law, $\langle G(P) \rangle \sim P^{\beta}$, with $\beta \sim 0.5$,over a wide range of pressure. For packings of circulo-lines, we also findrobust power-law scaling of $\langle G(P)\rangle$ over the same range ofpressure for aspect ratios ${\cal R} \gtrsim 1.2$. However, the power-lawscaling exponent $\beta \sim 0.8$-$0.9$ is much larger than that for jammeddisk packings. To understand the origin of this behavior, we decompose $\langleG\rangle$ into separate contributions from geometrical families, $G_f$, andfrom changes in the interparticle contact network, $G_r$, such that $\langle G\rangle = \langle G_f\rangle + \langle G_r \rangle$. We show that the shearmodulus for low-pressure geometrical families for jammed packings ofcirculo-lines can both increase {\it and} decrease with pressure, whereas theshear modulus for low-pressure geometrical families for jammed disk packingsonly decreases with pressure. For this reason, the geometrical familycontribution $\langle G_f \rangle$ is much larger for jammed packings ofcirculo-lines than for jammed disk packings at finite pressure, causing theincrease in the power-law scaling exponent.

Mechanical response of packings of non-spherical particles: A case study of 2D packings of circulo-lines