GB/T 46838-2025 Active National standards

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

Publish Date: 2025-12-02 Implement Date: 2026-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 46838-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods for synthetic resins and plastics

ICS Name: Plastic Composite

Publish Date: 2025-12-02

Implement Date: 2026-07-01

Pages: 36 pages

Scope

This document specifies and provides principles and guidelines for determining the fracture toughness of plastics under mode I crack opening in linear elastic fracture mechanics (LEFM) when the loading displacement rate is up to 1 m/s.
This document is applicable to materials with the same scope of application as GB/T 41932-2022, namely: — Rigid and semi-rigid thermoplastic molding, extrusion, and casting materials; — Rigid and semi-rigid thermoset molding and casting materials; — Composites containing short fibers with a length of less than or equal to 7.5 mm.
Note 1: It is generally believed that short fibers with a length of 0.1 mm to 7.5 mm can lead to non-uniformity and anisotropy in the crack tip zone during fracture. Therefore, similar to Appendix B of GB/T 41932-2022, Appendix A also provides an extension of the scope of application of the same test steps under defined conditions to the testing of rigid and semi-rigid thermoplastic or thermoset plastics containing such short fibers.
Note 2: Although the dynamic effects occurring at high loading rates largely depend on the tested materials and the testing equipment and specimen geometries used, the test methods and data processing methods given in this document are effective and are not affected by the testing equipment, specimen size, or material.