抄録
Dynamic Optical Coherence Straingraphy (D-OCSA) can visualize tomographically and non-destructively strain rate tensor distribution in polymer materials at the micro scale, using tomographic images consecutively captured by Optical Coherence Tomography (OCT) with deformation. D-OCSA can time-continuously provide the accurate displacement vector distribution, by recursively applying the speckle cross-correlation method as well as the high accurate subpixel analysis of upwind gradient method and image deformation method. In this study, D-OCSA was applied to biodegradable polymer composites PLLA/HA with tensile test, so as to evaluate space and time dependent micro-mechanical behaviors. Consequently, D-OCSA can display tomographically strain rate concentrated locally at the notch just before specimen is broken. It was concluded that D-OCSA is effective as a directly diagnosing technique of micro-mechanics, especially fracture mechanics.
