Recently, Hebei Xinda Steel Group Co., Ltd. has successfully obtained three national utility model patent authorizations for the "Series of Patents on Accelerated Fatigue Testing Technology for Acute Angle Notches of Hot-rolled U-shaped Steel Sheet Piles", which was innovatively developed. This significant technological achievement fills the gap in the specialized testing field of fatigue resistance performance of hot-rolled U-shaped steel sheet piles both at home and abroad, providing a reliable technical guarantee for enhancing the service safety and durability of engineering materials.
Steel sheet piles, as a kind of high-strength, efficient construction and environmentally friendly building material, are widely used in major projects such as docks, embankment protection, dry docks, retaining walls and cofferdams. Among them, hot-rolled U-shaped steel sheet piles are highly favored for their excellent mechanical properties and construction convenience. However, in complex geological and corrosive environments such as coastal tidal flats, sheet piles are constantly subjected to soil thrust, sediment wear and seawater erosion. Their fatigue performance and corrosion resistance are directly related to the safety and service life of engineering structures.
At present, conventional material performance testing methods, such as yield strength, tensile strength and impact toughness tests, are difficult to truly reflect the fatigue resistance behavior of hot-rolled U-shaped steel sheet piles in actual service environments. Especially the stress concentration problem at the interface between inclusions and the matrix is prone to induce fatigue cracks under alternating loads, becoming a potential safety hazard for the structure. In response to this common industry challenge, Xinda Technology Center, the enterprise technology center of Hebei Province, rose to the challenge and successfully developed an acute Angle notch accelerated fatigue testing system and its supporting methods with independent intellectual property rights.
Precise sample preparation, restoring true stress concentration
This device innovatively integrates a sample notch preparation system. Through high-precision positioning and sample preparation structure, it can process standardized sharp-angle notches at the intersection of the flange and web of U-shaped steel sheet piles. This design scientifically simulates the stress concentration areas in actual structures, laying a foundation for the accuracy and representativeness of subsequent fatigue tests.
High-efficiency tests, simulating the fatigue process in service
Equipped with an advanced experimental power and reset system, the accelerated fatigue testing device can apply cyclic loads to hot-rolled U-shaped steel sheet piles, and combined with the clamping structure, it ensures that the specimens remain stable and do not slip during dynamic testing. This device can obtain the fatigue performance data of materials under long-term service conditions in a short time, greatly improving the detection efficiency and engineering applicability.
Environmental coupling expands the dimensions of experiments
To achieve realistic working condition simulation, this device is equipped with a medium environment system, which can be combined with a low-temperature fatigue test system and a seawater corrosive medium system to create a multi-factor coupling environment such as low temperature and corrosion within a rubber soft sealing cover. Researchers can simultaneously conduct fatigue and corrosion interaction tests under simulated coastal climate conditions to comprehensively evaluate the durability of sheet piles under extreme working conditions.
Steel section matrix, serving national strategic projects
A high-level R&D platform is the "powerful responsibility" for breaking through cutting-edge scientific technologies and key core technologies, and it is the "solid foundation" supporting the high-quality development of enterprises. In recent years, Xinda Technology Center has developed a total of 24 types of high-performance and high-value-added section steel products, which have been widely used in many key national projects such as Shenzhen Metro, Ningbo Metro and Zibo High-Speed Railway Station, and have become the "leading brand of section steel mills in China".
Xinda Section Steel's production line is equipped with advanced facilities, featuring the fifth-generation CMA universal rolling mill, which offers advantages such as high dimensional accuracy of rolled pieces, compact structure, and great rigidity. By building a digital twin factory, precise mapping of equipment data, production process simulation and video surveillance has been achieved, facilitating remote and efficient control. The three-level control of the production line MES system ensures the full traceability of the products. The intelligent surface inspection system uses image processing and defect detection algorithms to identify surface defects of steel sections online, ensuring the stability of physical quality. We independently developed ultra-fast cooling technology, which increased the strength of H-shaped steel by 70MP. We also mastered multiple core technologies such as arc-shaped H-shaped steel and coating metal layers on Marine corrosion-resistant long strip profiles, fully demonstrating the technical strength and industry-leading level of our production line.
Conclusion
The exploration of science and technology never stops, and innovative development has no end. This patented technology not only provides scientific means for the quality control and performance optimization of hot-rolled U-shaped steel sheet piles, but also marks a crucial step forward for Xinda in the research and development of high-end steel testing equipment. In the future, Hebei Xinda Steel Group Co., Ltd. will strive to build an original technology source, enhance the efficiency of the R&D system, promote the collaborative innovation of steel materials and testing technologies, strengthen the core technological competitiveness, act as the "steel backbone" of the "strong country construction", and contribute more secure material solutions to global infrastructure construction!
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