基于漫反射法的钢构件塑性变形与损伤检测  

QUANTITATIVE RESEARCH ON PLASTIC DEFORMATION AND DAMAGE IN STEEL MEMBER BASED ON DIFFUSE-REFLECTANCE METHOD

作　　者：刘宇[1] 李兆霞[1] 黄跃平[1] 周胜[1] 

机构地区：[1]东南大学土木工程学院工程力学系,南京210096

出　　处：《力学与实践》2010年第3期35-40,共6页Mechanics in Engineering

基　　金：国家自然科学基金资助项目(10672038;90715014)

摘　　要：从结构损伤识别的需要出发研究能够准确反映钢构件承载过程中发生的塑性变形和损伤过程的量化测试方法.用漫反射法测量了钢构件在变形和损伤过程中表面粗糙度变化的图像,依据记录下来的表面图像进一步处理得到构件表面粗糙度的平均灰度值的变化,据此寻找对构件塑性变形和损伤状态相关并且敏感的参数指标.研究结果表明,基于漫反射法和图像处理得到的钢构件承载过程中表面粗糙度的平均灰度值的变化可以判断金属试样是否发生了塑性变形,并可定量描述试样在塑性变形后期的损伤程度.This paper proposes a method for quantitative testing of plastic deformation and damage in steel members during the process of loading.The Diffuse-Reflectance Method was used to obtain varied images of surface roughness of steel specimen during the process of stretching.With a further treatment of these images, the average gray value variations can be obtained to reflect the steel specimen surface roughness,which will help us to find out the sensitive parameter relevant to plastic deformation and damage status in the steel member under loading.The results show that,based on Diffuse-Reflectance Method and image processing,the average gray value variations of steel specimen＇s surface roughness during the loading process could be used to detect the start of plastic deformation and to describe the damage degree quantitatively in the late stage of plastic deformation of metal components or structures.

关 键 词：损伤过程检测 漫反射法 灰度值 表面粗糙度 

分 类 号：O348.1[理学—固体力学]