レーザスペックルゲージSSDGによるひずみ・き裂開口変位計測(破壊力学特集)

概要

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This paper discribes a new strain/displacement measuring SSDG system by using laser speckles. An emphasis was put on the development of a real time non-contact system which could be applicable to the measurements of a local strain and a crack opening displacement(COD)around crack tips both at room and elevated temperatures. A conventional double sensor SSDG system, in which two image sensors are required to eliminate the rigid motion of samples, was first discussed. A single sensor SSDG system was newly proposed which was applicable to the COD measurements. A real time processing of speckle movements was realized by an originally developed software. The applicability of the single sensor system was successfully tested in the COD measurements of cracks in ceramics and in the closure measurements of small cracks in steels under cyclic thermal stressing at elevated temperatures. Furthermore an application of this system to a crack tip deformation measurement under mixed loading of Mode I and II was included.
1994-10-15