激光全息干涉法研究混凝土的损伤演化规律

Study of damage evolution rule in concrete with laser holographic interferometry

将实时激光全息干涉试验系统与静态承压装置相结合,在单轴连续静态荷载作用下分别对不同混凝土试块连续进行激光实时全息干涉试验动态观测,同时测量受压混凝土的应力应变关系曲线,通过数码摄像机将全息干涉条纹图传输至计算机,获取实时全息干涉条纹图。根据干涉条纹的分布规律及其路径,直观地再现了混凝土的损伤演化过程,描述了混凝土构件的损伤演化断裂特征。为混凝土结构损伤分析与诊断的深入研究探索出了有效的试验方法。

An experimental system of real time laser holographic interferometry under static load has been created by use of He-Ne laser. Dynamic observation is made through holo film by use of digital video real time laser holographic interferometry fringes on the surface of different concrete specimen under uniaxial consecutive compression respectively. Meanwhile, the strain and stress relation curves of the compressed concrete are measured and their holographic interference fringes are conveyed to computer by digital video. The regularity of concretet damage development under uniaxial compression is obtained by real time laser holographic interferometry. The authors expound the principles of laser holographic interference and the formation of holographic interference fringes. Real time laser holographic interferometry can reflect the characteristics of concrete damage and failure development. The study and practice will enlarge the channel of damage analyses of concrete construction.