Explanation for reduction of mechanical properties of Japanese larch timber kiln-dried by the high-temperature setting method based on fractography observation

通过静态试验和扫描电镜观察，对日本落叶松木材在4种干燥方法和3种暴露条件下力学性能的降低进行了解释。日本落叶松木材的脆化现象较日本柳杉更为普遍，且高温固化使日本落叶松木材的脆化程度更高。结构材和透明小试件的弯曲试验结果表明，干燥方法对两者的力学性能都很关键，但暴露对其影响不大。

ensile tests were conducted, and the fracture surfaces were observed with the SEM to explain for reduction of mechanical properties of Japanese larch timber under four drying methods and three exposure conditions. Brittle cases were often observed in Japanese larch specimens compared with Japanese cedar, and the high-temperature setting method brought more brittleness for Japanese larch timber. The results of bending tests for structural timber and small clear specimens indicated that drying methods was critical to mechanical properties of both, but exposure had little effects on them.