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This document specifies the characterization parameters, test method and procedures, calculation and evaluation of results, as well as reporting requirements for the axial tensile properties of curved-edge triangular thin-walled tubes made of fiber-reinforced composites. This document applies to the testing, characterization, and evaluation of axial tensile properties of triangular thin-walled tubular components with curved-edged structures, based on fiber-reinforced polymer matrix composites. The document can be used for research and development, quality control in production, performance verification, and academic studies related to such products.
Fiber-reinforced composite curved-edge triangular thin-walled tubes demonstrate broad application prospects in lightweight fields such as aerospace and transportation due to their excellent specific strength and stiffness. However, such thin-walled components with special arc-triangular crosssections face significant challenges in the testing and evaluation of axial tensile performance. Firstly, at the level of testing methods, the lack of dedicated standards for their unique geometry creates technical gaps in key areas such as specimen preparation (e.g., insufficient adaptability when referring to ISO 527 standards), fixture design, and strain measurement. This often introduces stress concentrations and additional bending effects during testing, severely compromising the accuracy and reproducibility of results. Secondly, regarding the characterization and evaluation systems, existing specifications provide no unified criteria for characterization parameters or criteria for test validity, resulting in a lack of a consistent comparability for test data from different sources. These two major issues collectively hinder the effective certification and market-oriented application of such products. This document aims to provide standardized test method and evaluation requirements for characterizing the axial tensile performance of fiber-reinforced composite curved-edge triangular thinwalled tubes. The method utilizes full-length tubes as specimens and, through optimized end reinforcement and alignment techniques, enables direct and precise measurement of the overall axial tensile strength of the component, thereby establishing a unified technical specification to guide related performance testing. The specific and operable technical solutions proposed in this document not only fill a critical industry gap but also provide reliable data support for product development and production, promoting the compliant application of this profile in safety-critical fields.
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