Mechanics in Engineering ›› 2010, Vol. 32 ›› Issue (3): 35-40.DOI: 10.6052/1000-0879-2009-226

• Application study • Previous Articles     Next Articles

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

LIU Yu LI Zhaoxia HUANG Yueping ZHOU Sheng   

  • Received:2009-05-27 Revised:2009-09-21 Online:2010-06-08 Published:2010-06-08

Abstract: 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.

Key words: Damage identification, diffuse-reflectance method, the gray value, surface roughness