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在实时全息干涉计量实验中 ,当试件负荷甚大时 ,干涉条纹中会出现一些阴影区 ,它们在试件破裂过程中起重要作用。当负荷接近试件断裂强度时 ,可清晰看到并记录下阴影区的延伸、分叉、扩展直至试件破裂的过程。这些阴影区实际上就是几何光学中的焦散线现象。应用此现象可以计算应力强度因子。介绍了在寻找全息干涉条纹与应力强度因子之间关系所作的研究 ,导出了干涉条纹最大值与应力强度因子之间的定量关系式。从而 ,为使用全息法与焦散线法相结合的检测方法提供了定量计算的基础。
In real-time holographic interferometry experiments, when the specimen load is very large, some shadow areas appear in the interference fringes, which play an important role in the rupture of the specimen. When the load close to the breaking strength of the specimen, you can clearly see and record the shadow of the extension, bifurcation, expansion until the specimen rupture process. These shaded areas are actually caustics in geometric optics. Apply this phenomenon to calculate the stress intensity factor. The research on the relationship between holographic interference fringes and the stress intensity factor is introduced. The quantitative relation between the maximum value of interference fringes and the stress intensity factor is deduced. Thus, the basis for quantitative calculations is provided for the detection methods using holographic and caustic methods.