花旗松木构件内部缺陷应力波无损检测技术

Stress Wave Nondestructive Testing Technology for Internal Defects of Douglas-fir Wood Components

研究采用应力波无损检测技术识别和判定木构件裂缝、内部孔洞和虫蛀等内部缺陷,以提高应力波无损检测技术对残损缺陷检测的准确性。以花旗松木构件为研究对象,模拟孔洞、裂缝和虫蛀等缺陷,利用设备和软件对应力波传播速度检测并生成模拟图像,通过分析模拟图像及面积判断对缺陷的定性及定量识别能力。结果表明,应力波无损检测可以识别孔洞和裂缝缺陷的存在、相对位置和占比,不能识别虫蛀缺陷的存在。模拟出的实际孔洞面积和检测面积之间有统计上的显著线性关系。

The research on stress wave nondestructive testing technology is used to identify and judge the internal defects such as cracks,internal holes and moths of wood components,so as to improve the accuracy of stress wave nondestructive testing technology in the detection of damaged defects.Taking Douglas-fir wood components as the research object,the defects such as holes,cracks and moths are simulated,the equipment and software are used to detect the propagation speed of stress wave and generate simulated images,and the qualitative and quantitative identification ability of defects is judged by analyzing simulated images and area.The results show that stress wave nondestructive testing can identify the existence,relative position and proportion of holes and cracks,but cannot identify the existence of moth eaten defects.There is a statistically significant linear relationship between the simulated actual hole area and the detection area.