Spatio-Temporal Observation of Plastic Deformation Process by Speckle Pattern Interferometry

研制了一种新型动态电子散斑干涉仪（DESPI），该系统由1帧/秒的过程采样系统和30帧/秒的精细采样系统组成，可用于塑性变形状态的时空观测。(1)利用过程取样系统原位观察到应变集中带的扩展。局部应变脉动（LSP）是由精细采样系统新发现的。随着塑性变形的进行，波段的传播速度和LSP的频率逐渐降低。(2)提出了desi的相位分析方法“加减法”和相位展开算法。以10 nm量级的精度定量分析了局部应变集中带。

A new Dynamic Electronic Speckle Pattern Interferometory (DESPI) which consists of (1) course sampling system with 1 frame/sec, and (2) fine sampling system with 30 frame/sec has been developed for spatial-temporal observation of plastic deformation state : .(1) Propagation of strain concentrated band was observed in situ by the course sampling system. Localized strain pulsation (LSP) was newly found by the fine sampling system. As plastic deformation was progressed, propagating speed of the band and the frequency of the LSP were gradually decreased.(2) Phase analyzing method for DESPI, named "Addition and Subtraction Method" together with phase unwrapping algorithm was proposed. Localized strain concentrated band was quantitatively analyzed by the accuracy of the order of 10 nm.