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Table 4.8      Mechanical impedance of the Hopkinson bar, hybrid and pure composites


                                                                Density         Young’s         Wave velocity                          Impedance ratio,   
                    Materials           Specifications                                                            Impedance (kg/s)
                                                                      3
                                                                (kg/m )      modulus (GPa)          (m/s)                                     (%)
                   Silver steel        Hopkinson bars            7850            200.00            5047.55            7967.76              Reference

                        1                 G2/B3/G2               1850             19.11            3214.06             82.39                  1.03

                        2                  G2/J3/G2              1430             11.21            2799.97             221.92                 2.79

                        3                 G2/F3/G2               1560             13.14            2902.50             128.04                 1.61

                        4                  [G/B]3G               1870             18.52            3146.66             97.80                  1.23

                        5                  [G/J]3G               1420             11.00            2783.80             219.09                 2.75

                        6                  [G/F]3G               1510             12.32            2856.16             106.24                 1.33

                        7                    G7                  1890             18.88            3160.74             168.93                 2.12
                        8                    B7                  1780             15.39            2940.75             23.68                  0.30

                        9                     J7                 1080             3.31             1750.17             148.47                 1.86

                       10                     F7                 1160             3.70             1786.00             62.56                  0.79











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