基于应力波和微钻阻力的红松类木构件力学性能的无损检测

Mechanical properties non-destructive testing of wooden components of Korean pine based on stress wave and micro-drilling resistance

为了现场快速无损检测评估红松类古建筑木构件材料的主要力学性能,以红松为研究对象,对其进行应力波速度、微钻阻力值、含水率、弹性模量、弯曲强度的测定,探索红松材料力学性能无损检测方法,建立红松木构件材料力学性能计算模型。与单一无损检测方法(应力波检测方法、微钻阻力检测方法)的检测结果对比,采用应力波与微钻阻力检测相结合的方法(即利用应力波-阻力模量)推算被测材料的主要力学性能,准确度更高,红松波阻模量与材料抗弯弹性模量、抗弯强度的相关系数分别为0.826、0.724。

Korean pine timber samples were elected as experimental materials.Laboratory experiments were conducted to obtain stress wave speed,micro-drilling resistance,moisture content,as well as bending stiffness and strength for,exploring non-destructive testing methods of detecting the main mechanical properties.The pine performance computing model for the future on-site rapid test and evaluation were established at the mean time.After comparing with any single non-destructive testing method（stress wave detection,micro-drilling resistance tests）,the modulus of stress-resistograph testing method had higher accuracy.Analysis indicated the modulus of stress-resistograph in the linear regression relationships with the modulus of elasticity（MOE）,modulus of rupture（MOR）,and the coefficient of determination were 0.826,0.724,respectively.