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 2 Propagation velocity of longitudinal waves under different boundary conditions

Times	T1		T2		T3		T4
Times	v₁₁/m.s⁻¹	v₁₂/m.s⁻¹	v ₂₁/m.s⁻¹	v ₂₂/m.s⁻¹	v ₃₁/m.s⁻¹	v ₃₂/m.s⁻¹	v ₄₁/m.s⁻¹	v ₄₂/m.s⁻¹
1	4688	5000	4688	5000	4688	5000	4688	5000
2	4688	5000	4688	5000	4688	5000	4688	5000
3	4688	5000	4688	5000	4688	5000	4688	5000
4	4688	5000	4688	5000	4688	5000	4688	5000
5	4688	5000	4688	5000	4688	5000	4688	5000
6	4688	5000	4688	5000	4688	5000	4688	5000
7	4688	5000	4688	5000	4688	5000	4688	5000
8	4688	5000	4688	5000	4688	5000	4688	5000
9	4688	5000	4688	5000	4688	5000	4688	5000
10	4688	5000	4688	5000	4688	5000	4688	5000
Average	4688	5000	4688	5000	4688	5000	4688	5000

Ten independent experiments were carried out on the four specimens, the experimental results are shown in Table 2, where v_i1 and v_i2 (i = 1, 2, 3, 4) represent the propagation velocity at a distance of 150 mm and 300 mm, respectively