木材の打撃音分析によるヤング係数と水分変動の評価(<小特集>木質材料小特集)

概要

論文の詳細を見る
The natural frequency of longitudinal vibration due to sound emitted by hitting the cross section of lumber with hammer was measured to determine the modulus of elasticity (E_t) and weight chnge. And its application for mechanical grading of lumber and quality control for drying in the mill was discussed. E_t was recognized to be hifhly linear to the modulus of elasticity determined by static bending test (E_s). E_t was hardlky affected by hte length and section of lumber as compared with E_s, and practically represented the average value of E_t of components. Since the change of natural frequency during drying process was associated with E_t and weigth loss due to desorption of water, it mibht be used as an effective rougt classification method for mechanical grading and quality control in drying. Especially, as the lowest natural frequency of longitudinal wave was hardly affected by piling, measurement of longitudinal vibration after sawing and weight change during drying process coud be considered as reasonable quality control system.
社団法人日本材料学会の論文
1990-09-15