Innovation and Development of DIC Strain Measurement Technology: How Leading Domestic Companies Address Challenges in DIC Strain Measurement Experiments?

Digital image correlation technology is reshaping the field of strain measurement at an unprecedented speed. From high-temperature environments to dynamic deformation measurements, how are Chinese companies and research institutions breaking through technical bottlenecks?

Digital Image Correlation ( Digital Image Correlation ， DIC ) technology, as an important non-contact optical measurement method, has been widely applied in recent years in fields such as materials science, aerospace, civil engineering, and biomechanics. It achieves full-field displacement and strain measurement by tracking speckle patterns on the surface of objects, offering advantages such as non-contact, high precision, and full-field measurement.

01 DIC Four Major Technical Challenges

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Although DIC the technology has obvious advantages, it still faces multiple challenges in practical applications. In high-temperature environments, speckles on material surfaces tend to fall off due to oxidation, and thermal radiation causes image overexposure, severely affecting measurement accuracy; in large deformation measurements, especially when the deflection angle exceeds 40 °, DIC the failure rate of traditional 30% algorithms' matching may exceed DIC , leading to fractured regions in the displacement field; in complex environments, such as aircraft in flight affected by high-speed airflow, the measurement camera's position and posture may vibrate, requiring real-time dynamic calibration; in biomechanics applications, the surface heterogeneity of living tissues, physiological environment constraints, and complex deformation characteristics (such as hyperelasticity and large shear deformation) pose special challenges to

measurement.

02 Technical Innovations and Solutions

🎉🎉🎉🎉🎉🎉🎉🎉 DIC To address the challenges of high-temperature measurement, researchers have developed blue light DIC and ultraviolet light UV-DIC ( UV-DIC ) systems. These systems use short-wave monochromatic light sources and narrow-band filters to effectively suppress thermal radiation interference. 1200 The system can maintain clear speckle images at ℃. Through plasma spraying methods, speckle patterns made of tungsten carbide can even be used at high temperatures of 1400-1600

℃. For large deformation measurement, NewTopo 3D has proposed a large-angle weak correlation speckle matching method. This method matches the reference image sequence and the target image sequence as two sets of image sequences, providing reliable initial values, making the algorithm faster and more accurate. The multi-level hierarchical matching strategy, based on feature point-guided progressive matching, decomposes global large deformation into local rigid body motion and small deformation iterations, improving measurement accuracy [citation:5]. The application of GPU acceleration technology has greatly improved the processing efficiency of DIC the system. Experimental data show that The application of GPU GPU acceleration of global DIC measurement speed is 10-70 times faster than CPU, significantly shortening processing time without affecting measurement accuracy.

Simulation model-based DIC technology represents the future development direction. For example, EikoTwin DIC technology directly displays experimental measurement results on simulation models, providing suggestions for simulation model optimization and achieving integrated "test-simulation" analysis. It enables more stable strain tracking on smooth or high-temperature oxidized surfaces, promoting synergy between simulation and experiments. - 03 Future Development Trends

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The technology is moving towards multi-technology integration.

DIC Combined use with hole-drilling methods has become a revolutionary solution for residual stress analysis, with error margins controllable within ± DIC in aerospace aluminum alloy testing. The introduction of deep learning algorithms brings disruptive changes. Convolutional Neural Network (CNN) 7MPa -driven automatic speckle generation technology improves measurement efficiency, while Long Short-Term Memory (LSTM) effectively solves cumulative error problems in large deformation measurements. 300% The technology continues to expand in industrial applications. In residual stress detection of nuclear power pipeline welding, the technology shows higher field adaptability than traditional X-ray diffraction methods. With the development of new detection technologies such as photon counting, DIC this technology is expected to open new application scenarios in biomechanics and medical devices. DIC The technology has moved from the laboratory to practical engineering applications, becoming a powerful tool to solve complex measurement challenges. Domestic companies and research institutions, through continuous innovation, have not only deepened applications in traditional fields but also demonstrated China's technological innovation strength in high-end fields such as aerospace and biomedicine. X射线衍射法更高的场地适应性。随着光子计数 DIC 等新型探测技术的发展，该技术有望在生物力学和医疗器械领域开辟全新应用场景。

DIC 技术已从实验室走向工程实际应用，成为解决复杂测量挑战的有力工具。国内企业和研究机构通过持续创新，不仅在传统领域深化应用，更在航空航天、生物医学等高端领域展现了中国科技的创新实力。