GB/T 44003-2024 in English

GB/T 44003—2024: In-depth interpretation of the delamination strength test method for REBCO coated conductors

Standard formulation background and technology evolution analysis

REBCO coated conductor introduction:As the second generation of high-temperature superconducting tape, REBCO has a high irreversible magnetic field and excellent current carrying capacity, and is widely used in superconducting magnets, cables, motors and other fields.

With the expansion of application scenarios, the delamination problem of materials under electromagnetic force and thermal stress has become increasingly prominent. In order to accurately evaluate its mechanical properties, the International Organization for Standardization decided to formulate a unified test standard.

This standard adopts the anvil pull method, which is an ideal choice because of its simple principle and applicability to tests under a variety of temperature conditions. Combined with the three-parameter Weibull distribution data analysis method, ensure that the influence of data discreteness is minimized.

Details of the test device

Test steps and data processing

Calculation of key parameters:

• Delamination strength σ_d: Calculated by the maximum tensile force F and the contact area S, the formula is σ_d=F/S.
• Weibull distribution analysis: Use the three-parameter Weibull model (Formula 1) to fit the test data to ensure the statistical significance of the data. It is recommended to use the least squares method to fit the three parameters α, β, and γ.

Formula: σ_d=F/S

Implementation Suggestions

Conclusion

GB/T44003-2024 standard provides a scientific basis for the quality control and engineering design of REBCO coated conductors. By strictly following the test method and combining the data analysis of Weibull distribution, the delamination strength of the material can be effectively evaluated to ensure the safe operation of the superconducting device.