Observation of Tensile Tests for Composite Materials

I. Experimental Background

In cutting-edge fields such as aerospace and new energy, composite materials are reshaping industrial landscapes with their advantages of light weight and high strength. However, in materials science, the brittle fracture issue in tensile tests of composite materials has long plagued numerous researchers.

This experiment combines high-speed cameras with Digital Image Correlation (DIC) to develop a precise scheme for moving target tracking from sequential images [1].

By using high-speed cameras to capture sequential images of the moment when composite materials fracture, and inputting them into DIC software for in-depth analysis, the pixel coordinates of target points can be accurately obtained, realizing full-process tracking of moving targets. This undoubtedly provides strong support for uncovering the complex mechanical behavior of composite materials.

II. Ingenious Integration of High-Speed Cameras and DIC Technology

To facilitate better image analysis, we sprayed matte white self-spray paint on the surface of the composite material to form a uniform white base, and then created speckle patterns.

With a resolution of 1280 × 88 and a high frame rate of 160,000 FPS, the Shenshi Intelligent Ultra-High-Speed Series cameras can quickly and accurately acquire continuous, complete and high-precision speckle images of the composite material surface at various deformation stages under loading, laying a rich and accurate data foundation for subsequent analysis.

Figure | Observation of Composite Material Tensile Test

After inputting the composite material images captured by the high-speed camera into the DIC software, precise matching and analysis of speckle images at different moments on the composite material surface are performed using digital image correlation algorithms. By tracking the motion changes of special marker points, the displacement and deformation information on the composite material surface can be further obtained.

Figure | Speckle Image Captured by High-Speed Camera

This method not only improves the accuracy and efficiency of measurement, but also provides richer and more accurate data support for the study of mechanical properties of composite materials, helping to deeply understand the deformation behavior and failure mechanism of materials under loading.

III. Empowering the Development of Materials Science

The application advantages of high-speed cameras in composite material tensile tests are obvious. Their high frame rate and rapid capture capability enable us to observe structural changes, compatibility and other characteristics of composite materials under tension, thereby quickly evaluating the feasibility and advantages of composite materials. This is of great significance for materials science research and new product development.

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References

[1] Mei Huafeng, Chen Peng, Tong Xiaohua, et al. Fast Moving Target Tracking from High-Speed Camera Sequential Images Using Digital Image Correlation Method[J]. Geomatics World, 2013, 20(05): 51-58.