摘要
复合材料层合板在外界激励下很容易产生层合板表面无法探测到的内部低速冲击损伤,从而引起材料失效甚至破坏。首先通过对低速冲击后的层合板进行目视检测获得了层合板受冲击后的若干损伤特征,然后利用数字散斑干涉测量技术(DSPI)对受到低速冲击的层合板在热载下进行内部低速冲击损伤检测。实验结果表明DSPI技术通过观察散斑干涉条纹的不规则分布即可准确、灵敏识别复合材料层合板表面难以观察到的内部低速冲击损伤,并且通过图像处理技术及相移技术可以准确评估内部低速冲击损伤对复合材料层合板的结构变形带来的影响。
The barely visible internal low-velocity impact damage in composite laminates that results from the structure deformation caused by external excitation is of major concern and will bring about materials＇ failure, or even destruction. The impact damage characteristic of impacted laminates is firstly measured by visual inspection. Then, digita/ speckle pattern interferometry （DSPI） is used to study the low- velocity impact damage in composite laminates under thermal loading. Experimental results show that barely visible low-velocity impact damage can be effectively and sensitively identified by DSPI with observing the abnormal speckle fringes distribution. Additionally, the influence of the internal low-velocity impact damage on the structure deformation of the composite laminates can be accurately evaluated by and ohase-shifting techniuues
出处
《应用激光》
CSCD
北大核心
2012年第6期527-531,共5页
Applied Laser
基金
中央高校基本科研业务费专项基金资助项目
南京航空航天大学博士学位论文创新与创优基金资助项目(项目编号:BCXJ11-01)
关键词
激光无损探伤
复合材料层合板
目视检测
数字散斑干涉术(DSPI)
低速冲击损伤
相移技术
laser nondestructive testing
composite laminates
visual inspection
digital speckle pattern interferometry （DSPI）
low-velocity impact damage
phase-shifting technique
