「２タイプの実験法によるき裂発生評価手法の一提案 構造用集成材木材を対象としたモードI破壊靱性性能の評価方法に関する考察 その３」に対する討論

Abstract

Experimental achievements on the fracture toughness of wood constituting glulam in the above paper are discussed about the following items: 1) The approach based on fracture mechanics for predicting the fracture strength of wood and wood joint has some serious defects. 2) The description of ductile-like fracture seems inadequate and the J-integral at the maximum load point is doubtful as the fracture toughness for crack initiation, because the tensile softening in the load-displacement curve of wood in 3PB and CT tests is caused by multiple steps of intermittent cracking.