Official Journal of the Japan Wood Research Society
Table 2 Concentrated masses (thumbtacks, wood screws) attached to small round bars
From: Effect of shear and rotatory inertia on the bending vibration method without weighing specimens
Concentrated mass | Specimens | Mass ratio μ | ||||
|---|---|---|---|---|---|---|
Type | Head diameter | Nominal diameter | Length | Mass | Diameter, length | |
Thumbtack | 11 | 1 | 8 | 0.6 | 6, 300 9, 300 | 0.214 0.0905 |
Wood screw | 6 | 4 | 32 | 2.1 | 20, 300 25, 300 36, 150 | 0.0615 0.0437 0.0393 |
Wood screw | 9 | 5 | 37 | 3.6 | 30, 300 36, 200 36, 250 | 0.0503 0.0485 0.0395 |
Wood screw | 8 | 4 | 65 | 3.9 | 36, 300 | 0.0392 |