Effects of tightening speed on torque coefficient in lag screw timber joints with steel side plates

Autor:	Yasushi Fujisawa, Koichiro Ishikawa, Akihisa Kitamori, Doppo Matsubara, Yoshiaki Wakashima, Hidemaru Shimizu
Rok vydání:	2017
Předmět:	040101 forestry 0106 biological sciences Materials science 04 agricultural and veterinary sciences Thread (computing) 01 natural sciences Torque coefficient Biomaterials Lag screw 010608 biotechnology Bearing surface 0401 agriculture forestry and fisheries Torque Composite material
Zdroj:	Journal of Wood Science. 64:112-118
ISSN:	1611-4663 1435-0211
DOI:	10.1007/s10086-017-1679-3
Popis:	To investigate the effects of tightening speed on the torque coefficient in lag screw timber joints with steel side plates, tightening tests were conducted on main timber members made from Cryptomeria japonica, Chamaecyparis obtusa and Pseudotsuga menziesii, under four tightening speed conditions (1, 4, 10, and 20 rpm). Major stick-slip behavior was observed in C. obtusa based on the relationship of tightening angle with clamp force, tightening torque, and thread torque at tightening speeds of 1 and 4 rpm. In addition, tightening speed’s effects on the torque coefficient (K) varied depending on the wood species of the main member. In P. menziesii, K was not affected by the tightening speed: the ratio of torque expended on tightening was 25% on average, and the ratio of torque expended on bearing surface friction was higher than the ratio of torque expended on thread friction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8d9c74c8bc8fa9cbc64712e40f05695a https://doi.org/10.1007/s10086-017-1679-3 Zobrazit plný text záznamu Full text from SpringerLink