Quantitative assessment of microscale slip activities and plastic localizations is essential for understanding the complex deformation mechanisms in crystalline materials. However, few experimental studies have been able to dynamically measure the deformation fields of rapidly evolving slip activities at the microscale. In this study, we used the Sampling Moiré Method (SMM) to directly measure the dynamic deformation fields of slip activities in Nickel-Based Single-Crystal (NBSC) superalloy under in-situ tensile test, and the strain and displacement fields under the evolving microplastic events with intense slip activities around the notch of the NBSC superalloy specimen were obtained for the first time. The dynamic evolution of slip bands was quantitatively characterized through detailed statistical analysis of strains and displacements under different loads. The locations of the initial appearance of slip traces were successfully predicted by the regions of plasticity localization. The results show that the deformation fields exhibit both high spatial and temporal resolutions, enabling the capture of nanometer-scale displacement fields and visualization of the dynamic fluidity of slip accumulation. This method demonstrates the superiority of the dynamic characterization of the plastic deformation field at the microscale and the promise of its application for characterizing the slip activities of various crystalline metals.

In recent years, the development of Carbon Fiber Reinforced Polymer (CFRP) in the aviation industry has attracted much attention. Quantitative evaluation of its fracture process and damage prediction has become the key of the research. This paper established an experimental system based on the sampling Moiré method to study the evolution of interlayer strain field of a CFRP cross-ply laminate sample. The system consists of a three-point bending device, a microscope, an industrial camera and a CFRP sample with a nanoimprint grating. Using this system, a full-field measurement of the microscale strain field in the loading process of the sample, and the strain concentration level before crack occurrence was quantitatively evaluated. The results show that the initiation of interlayer cracks in CFRP is directly related to strain concentration, and obvious strain concentration occurs before crack initiation. Compared with the region around the crack, the strain concentration in the crack center is more obvious before crack initiation. With the increase of bending load, the strain concentration in the central region increases significantly, while the strain concentration in the surrounding region does not change distinctly. In the experimental method used, when the set strain of CFRP surface image is 0.1%, the root mean square error of strain measurement is less than 5×10⁻⁵. This allows for accurate analysis of the strain field evolution of CFRP laminates before crack initiation and effectively predicts the location of crack initiation.