メタルプレートコネクターを用いた継手における疲労強度の時間的依存性

概要

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Partly pulsating tension load with the frequency range of 1 Hz to 16. 7 Hz was applied to timber butt-joints with metal plate connectors. The time dependent effect on fatigue strength was discussed with respect to the relation between cycles to failure (N) and loading components, i. e., repetitive load (P_r) and constant load (P_c). The results obtained are as follows: (1) N obtained by partly pulsating tests at 16. 7 Hz and 10 Hz did not depend on P_c but dominantly on P_r, when the sum of P_c and P_r was less than 70% of the static strength (P_o) and P_r was grater than the fatigue limit (P_c). (2) The failure mode of the joints in partly pulsating tests was mostly the withdrawal of teeth of the connector. This tendency was observed only in high stress levels of pulsating tests. (3) In lower frequency tests at 5 Hz and 1 Hz, N decreased to 1/2 (5 Hz) and 1/3 (1 Hz) of the value of N obtained in 10 Hz tests, when P_r/P_o was from 0. 4 to 0. 6 and the sum of P_c and P_r was 750 kg.
社団法人日本材料学会の論文
1981-07-15