New results for the effects of higher-order moduli and material properties on strain waves propagating through elastic circular cylindrical rodsM. Tantawy, H. I. Abdel-Gawad and A. F. GhalebEur. Phys. J. Plus, 135 1 (2020) 7DOI: https://doi.org/10.1140/epjp/s13360-019-00014-1