GB/T 46838-2025: Plastics - Determination of fracture toughness(GIC and KIC) at moderately high loading rates(1m/s)

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Scope

This Document specifies and provides principles and guidelines for determining the fracture
toughness of plastics in the crack-opening mode (Mode I) using the linear-elastic fracture
mechanics (LEFM) method at loading displacement rates up to 1 m/s.
This Document applies to materials within the same scope as GB/T 41932-2022, namely:
--- rigid and semi-rigid thermoplastic molding, extrusion, and casting materials;
--- rigid and semi-rigid thermosetting molding and casting materials;
as well as composite materials containing short fibers with lengths of 7.5 mm or less.
NOTE 1: It is generally considered that short fibers with lengths between 0.1 mm and 7.5 mm cause
inhomogeneity and anisotropy in the crack-tip zone during the fracture process. Therefore, similar to
Appendix B of GB/T 41932-2022, Appendix A extends the applicability of the same test procedures,
under specified conditions, to testing of rigid and semi-rigid thermoplastic or thermosetting plastics
containing such short fibers.
NOTE 2: Although dynamic effects occurring at high loading rates depend largely on the material being
tested as well as the used testing equipment and specimen geometry, the test methods and data processing
procedures provided in this Document remain valid and are independent of the specific testing equipment,
specimen dimensions, or material type.

Basic Data

Standard ID	GB/T 46838-2025 (GB/T46838-2025)
Description (Translated English)	Plastics - Determination of fracture toughness(GIC and KIC) at moderately high loading rates(1m/s)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080.01
Word Count Estimation	34,399
Date of Issue	2025-12-02
Date of Implementation	2026-07-01
Issuing agency(ies)	State Administration for Market Regulation, Standardization Administration of China