Influence of boundary conditions on acoustic emission propagation characteristics of Zelkova schneideriana

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Propagation velocity of the third layer surface wave under different boundary conditions

Times	T1		T2		T3		T4
Times	v₁/m.s⁻¹	v₂/m.s⁻¹	v₁/m.s⁻¹	v₂/m.s⁻¹	v₁/m.s⁻¹	v₂/m.s⁻¹	v₁/m.s⁻¹	v₂/m.s⁻¹
1	938	949	1339	1240	938	938	1119	1042
2	938	949	1339	1240	938	938	1339	1042
3	938	949	1339	1240	938	938	1339	1042
4	938	949	1339	1240	938	938	1364	1042
5	938	949	1339	1240	938	938	1339	1042
6	938	949	1339	1240	938	938	1339	1042
7	938	949	1119	1240	938	938	1339	1042
8	938	949	1339	1240	938	938	1563	1042
9	938	949	1119	1240	938	938	1103	1042
10	938	949	1339	1240	938	938	1103	1042
Average	938	949	1295	1240	938	938	1295	1042

Ten independent tests were carried out on four specimens, where v₁ and v₂ denote the propagation velocity at a distance of 150 mm and 300 mm, respectively, the test results are shown in Table 1.