  We investigate the impact of inelastic collisions between dark matter (DM)
and heavy cosmic ray (CR) nuclei on CR propagation. We approximate the
fragmentation cross-sections for DM-CR collisions using collider-measured
proton-nuclei scattering cross-sections, allowing us to assess how these
collisions affect the spectra of CR Boron and Carbon. We derive new CR spectra
from DM-CR collisions by incorporating their cross-sections into the source
terms and solving the diffusion equation for the complete network of reactions
involved in generating secondary species. In a specific example with a coupling
strength of $b_{\chi}=0.1$ and a DM mass of $m_{\chi}=0.1$ GeV, considering a
simplified scenario where DM interacts exclusively with Oxygen, a notable
modification in the Boron-to-Carbon spectrum due to the DM-CR interaction is
observed. Particularly, the peak within the spectrum, spanning from $0.1$ GeV
to $10$ GeV, experiences an enhancement of approximately 1.5 times. However, in
a more realistic scenario where DM particles interact with all CRs, this peak
can be amplified to twice its original value.Utilizing the latest data from
AMS-02 and DAMPE on the Boron-to-Carbon ratio, we estimate a 95\% upper limit
for the effective inelastic cross-section of DM-proton as a function of DM
mass. Our findings reveal that at $m_\chi\simeq 2$ MeV, the effective inelastic
cross-section between DM and protons must be less than
$\mathcal{O}(10^{-32})~{\rm cm}^2$.
