Overview
IEC 61788-19:2013 is an international standard published by the International Electrotechnical Commission (IEC) focused on the mechanical properties measurement of reacted Nb3Sn composite superconductors. Specifically, it defines a detailed test method for performing room temperature tensile tests on reacted Cu/Nb3Sn composite superconducting wires. The goal of these tests is to accurately measure the modulus of elasticity and proof strength of the superconducting composite materials, essential metrics for assessing material performance in practical applications.
This standard is critical for industries and laboratories working with superconducting wires, where mechanical property data ensures reliability during fabrication, handling, and end use in electrical and electronic devices.
Key Topics
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Scope and Sample Requirements:
The standard targets bare, reacted Nb3Sn composite wires with round or rectangular cross-sections, sized between 0.15 mm² and 2.0 mm² in cross-sectional area. The copper to non-copper volume ratio should range from 0.2 to 1.5 with no insulation on the samples.
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Test Methodology:
Defines the tensile test procedures to measure stress versus strain at room temperature, incorporating:
- Gripping techniques ensuring correct specimen fixation
- Use of precision extensometers (including optical extensometers) to measure strain accurately
- Controlled test speeds for consistent loading
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Mechanical Property Determination:
Key mechanical properties obtained from test data include:
- Modulus of Elasticity (E) – indicating material stiffness
- 0.2% Proof Strength (Rp0.2) – related to the onset of plastic deformation, crucial for assessing material yield limits
- Optional properties such as elastic limit, tensile strength, and elongation after fracture, though these are noted to have measurement uncertainties based on international round robin tests.
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Uncertainty and Test Reporting:
The standard addresses methods to evaluate uncertainty in measurements and provides guidance on comprehensive test reporting covering specimens, conditions, and results, ensuring reproducibility and traceability.
Applications
IEC 61788-19:2013 supports wide-ranging applications in the field of superconductivity and electrical engineering, including:
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Superconducting Magnet Manufacturing:
Mechanical properties determined by this standard help design and validate Nb3Sn wires used in high-field magnets for particle accelerators, MRI machines, and fusion reactors.
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Quality Control in Wire Production:
Manufacturers can apply this tensile test method to monitor wire consistency and meet mechanical specifications critical for reliability under electromagnetic stresses.
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Material Research and Development:
Researchers investigating new composite formulations or reaction processes leverage this standard to quantify mechanical improvements or degradation at room temperature.
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Performance Assurance in Electrical Equipment:
Reliable tensile data ensures superconducting wires will tolerate operational stresses, preventing mechanical failure in critical electrical and electronic systems.
Related Standards
Professionals utilizing IEC 61788-19:2013 may also consider other relevant standards for broader superconductivity material characterization:
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IEC 61788-series:
Various parts cover superconducting materials’ electrical, thermal, and magnetic properties measurement.
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ISO Material Testing Standards:
General standards on tensile testing and elasticity measurement complement the specialized procedures in IEC 61788-19.
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IEC 61000-series:
Standards on electromagnetic compatibility, relevant when considering mechanical strain effects on superconducting wire performance.
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IEC 60617 & Electropedia:
Provide terminologies and definitions ensuring consistent language for superconductivity and electrotechnical measurements.
Keywords: IEC 61788-19, Nb3Sn composite superconductors, tensile test, modulus of elasticity, proof strength, room temperature mechanical properties, Cu/Nb3Sn wire, superconductivity standards, mechanical testing superconductors, electrical wire quality control.
Open preview (PDF)Superconductivity - Part 19: Mechanical properties measurement - Room temperature tensile test of reacted Nb3Sn composite superconductors
