Experimental Study on the Boundary Reflection Effect of Stress Wave Propagation Based on the Newly Developed Test Apparatus

Table 2

Wave impedance values of common materials.

Parameters	Rubber	Woodblock	Copper	Aluminum	Steel	Granite	Limestone	Sandstone
Wave speed (m/s)	235	3,320	4,400	6,350	5,200	4,000–6,800	3,200–5,500	3,000–4,600
Density (kg/m^3)	1,490	540	3,670	2,700	7,900	2,600–3,000	2,300–2,800	2,100–2,900
Wave impedance (10^6 kg/m^2·s)	0.35	1.79	16.15	17.15	41.08	8–20	7–19	6–13