Official Journal of the Japan Wood Research Society
From: Effects of tightening speed on torque coefficient in lag screw timber joints with steel side plates
Conifer species (n = 6) | K | µ th | µ b | F max (kN) | T max (Nm) |
---|---|---|---|---|---|
Cryptomeria japonica | |||||
1 rpm | |||||
Ave. | 0.395 | 0.330 | 0.244 | 4.90 | 24.34 |
SD | 0.078 | 0.116 | 0.058 | 0.21 | 1.14 |
4 rpm | |||||
Ave. | 0.353 | 0.364 | 0.161 | 5.02 | 26.02 |
SD | 0.041 | 0.095 | 0.018 | 0.08 | 0.48 |
10 rpm | |||||
Ave. | 0.422 | 0.412 | 0.227 | 4.86 | 25.28 |
SD | 0.050 | 0.102 | 0.041 | 0.29 | 0.78 |
20 rpm | |||||
Ave. | 0.456 | 0.480 | 0.227 | 4.83 | 25.38 |
SD | 0.054 | 0.105 | 0.020 | 0.08 | 0.66 |
Chamaecyparis obtusa | |||||
1 rpm | |||||
Ave. | – | – | – | – | – |
SD | – | – | – | – | – |
4 rpm | |||||
Ave. | – | – | – | – | – |
SD | – | – | – | – | – |
10 rpm | |||||
Ave. | 0.264 | 0.116 | 0.211 | 10.22 | 22.56 |
SD | 0.030 | 0.046 | 0.035 | 0.57 | 1.64 |
20 rpm | |||||
Ave. | 0.281 | 0.226 | 0.155 | 9.34 | 26.61 |
SD | 0.063 | 0.096 | 0.029 | 1.26 | 3.48 |
Pseudotsuga menziesii | |||||
1 rpm | |||||
Ave. | 0.275 | 0.080 | 0.248 | 10.23 | 21.71 |
SD | 0.032 | 0.033 | 0.056 | 0.39 | 1.21 |
4 rpm | |||||
Ave. | 0.269 | 0.082 | 0.241 | 11.27 | 23.06 |
SD | 0.030 | 0.020 | 0.052 | 0.59 | 1.14 |
10 rpm | |||||
Ave. | 0.270 | 0.125 | 0.211 | 11.23 | 25.48 |
SD | 0.047 | 0.058 | 0.050 | 0.55 | 3.53 |
20 rpm | |||||
Ave. | 0.281 | 0.150 | 0.211 | 11.09 | 27.95 |
SD | 0.016 | 0.045 | 0.030 | 0.58 | 2.11 |