構造用集成材木材を対象としたモードI破壊靭性性能の評価方法に関する考察

概要

論文の詳細を見る
Splitting of wood loaded perpendicular to the grain is a critical issu in timber engineering, and the splitting and failure of wood at its connection are studied in some articles. But to research the characterization and to evaluate that fracture is very difficult. Now we have no standard method to determine the fracture toughness of wood for timber engineering. So we need some simple or useful methods. Thus we conducted CT test with some woods for structural glulam. Durning the tests, we checked behaviour of crack on the surfaces. We understood that fracture of wood starts at maximum load or after that, but the propagation is unconstant. Then we caluculated J_<IC> , and comparised with some past results. Additonally we studied the relationship between the work-energy and crack length. As a result, we proposed that crack initiation point is almost at maximum load in CT tests. And we understood followings, 1) Crack length (a_0/W=0.5〜0.6) is useful to calculate lower limit of J_<IC> in CT test. 2) To calculate J-integral, we need FEM-analysis with in-depth element properties
社団法人日本建築学会の論文
2008-09-30