抄録
A previously observed optical interferometric band pattern (the white-band, WB) interpreted as representing localized strain has been compared with a mechanical band structure known as the Lüders line. A WB can be observed in a fringe system formed with the subtraction method of electronic speckle-pattern interferometry (ESPI) applied to in-plane displacement of a plastically deforming metal specimen. The front of Lüders line (FLL) is known to be representing a yield location. Experiments have been carried out to compare the locations of WBs and FLLs on the same specimen to explain the meaning of WBs. The experimental results indicate clear correlation between the WBs and FLLs under monotonic tensile loading and under cyclic tensile loading, proving experimentally that WBs and FLLs are the visualization of the same physical phenomenon but the each strain sensitivity is not the same.
