透明试样受集中载荷的应力应变同步测量方法

SIMULTANEOUS MEASUREMENT OF STRESS AND STRAIN FOR TRANSPARENT SPECIMENS SUBJECTED TO CONCENTRATED LOAD

  • 摘要: 本文提出了一种结合数字梯度敏感(digital gradient sensing, DGS)方法和数字图像相关(digital image correlation, DIC)方法,可实现平面应力状态下透明试样受集中载荷的应力应变同步测量方法。分别在透明试样和散斑板表面制备蓝色和红色的荧光散斑,然后利用3CCD相机分离试样和散斑板上特定光谱的荧光散斑,从而实现前后两个散斑图像的独立成像。分别计算可得到透明试样的应变和应力梯度场。通过展开半平面集中力加载实验,进行实验结果与解析值的对比,验证了此方法的可行性。

     

    Abstract: In this paper, a combined measurement method combining digital gradient sensing (DGS) and digital image correlation (DIC) is proposed, which can realize simultaneous stress and strain measurement of transparent samples subjected to concentrated load under plane stress state. The fluorescent speckles of blue and red were prepared on the surface of transparent sample and speckle plate respectively, and then 3CCD camera was used to separate the fluorescent speckle of specific spectrum on the sample and speckle plate, so as to realize the independent imaging of the two speckle images. The strain and stress gradient fields of the transparent sample can be obtained by calculating separately. The feasibility of this method is verified by the comparison between the experimental results and the analytical values of the half-plane concentrated force loading experiment.

     

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