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This document specifies the combined test method for axial bending and AC withstand voltage of tubes with round section made of fiber-reinforced plastic materials for power operation (with a wall thickness ranging from 2.0 to 6.0 mm, a diameter ranging from 20.0 to 70.0 mm). This document defines the test procedures, parameter monitoring requirements, and damage assessment principles for the test. This test method adopts a combined test mode of three-point bending load superimposed with AC withstand voltage, to achieve real-time damage identification under the combined electromechanical effects. This document is applicable solely to the factory inspection, performance verification, and reliability evaluation of fiber-reinforced plastic tubes with round section. It does not apply to tubes made of nonfiber- reinforced composite materials or those with special cross-sectional shapes.
Fiber-reinforced plastic tubess with round section are widely used in the maintenance of electrified railway catenary systems and high-voltage electrical operations globally. This standard adopts a combined test of three-point bending loading superimposed with power frequency withstand voltage, synchronously monitoring force values, leakage current and macroscopic conditions to real-time identify internal and external hidden damages of the tubes. It provides a testing method as technical guidance for quality control and performance verification of such tubes worldwide, enhancing the reliability of cross-regional applications. The development of this standard is grounded in the current state of international standards, application requirements, and scientific technical principles. At the international level, existing standards exhibit limitations in testing dimensions. For instance, ISO 3597-2 does not address hollow structures and electrical performance, while IEC 60855-1 fails to capture dynamic damages during testing. Furthermore, in global applications, these tubes are extensively used in tool manufacturing due to their lightweight and high stiffness, but their quality varies significantly depending on fiber types, resin formulations, and pultrusion processes, necessitating a unified testing method. Technically, referencing the power frequency withstand voltage requirements of IEC 60060-1 and combining the principles of three-point bending, this standard sets a range of wall thicknesses from 2.0 to 6.0 mm and diameters from 20.0 to 70.0 mm. It applies power frequency voltage at 80% of the rated bending load while monitoring leakage current, aligning with the international trend of “multiphysical field coupling testing.
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