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本文用傅里叶方法研究直接记录散斑图的衍射效应,从理论上指出直接记录散斑图是物光与强入射参考光干涉形成的,其实际散斑尺寸比忽略参考光时的计算值大一倍。本文用散斑直接记录两次曝光法量测了硬铝合金材料的弹性常数及边裂纹试样裂纹尖端弹性位移场及裂纹张开位移COD,并求出了Ⅰ型裂纹的应力强度因子K_I,得到一些有益的结果。散斑法可望在岩石力学实验中获得应用。
In this paper, we study the diffraction effect of direct speckle patterns by using the Fourier method. It is theoretically pointed out that direct speckle patterns are formed by the interference of object light with strong incident reference light. The actual speckle size is smaller than the calculated value Doubled In this paper, the speckle direct recording double exposure method was used to measure the elastic constant of the hard aluminum alloy and the crack tip elastic displacement field and crack open displacement COD of the edge crack specimen. The stress intensity factor K_I of type I crack was obtained, Get some good results. Speckle is expected to be used in rock mechanics experiments.