GB/T 41932-2022
Plastics—Determination of fracture toughness (GIC and KIC)—Linear elastic fracture mechanics (LEFM) approach (English Version)

Standard No.

GB/T 41932-2022

Language

Chinese, Available in English version

Release Date

2022

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 41932-2022

Scope

This document describes a method for the determination of the fracture toughness of plastics under given conditions and the mode of crack opening (mode I). To accommodate different types of equipment or different types of materials, two test methods with pre-cracked specimens are described, namely the three-point bending test and the compact specimen tensile test. This document applies to the following materials, including composite materials containing short fibers with a length less than or equal to 7.5 mm: --- Rigid and semi-rigid thermoplastic molding, extrusion and casting materials; --- Rigid and semi-rigid thermosetting molding and casting materials Material. Note 1: It is generally believed that short fibers with a length of 0.1 mm to 7.5 mm will cause heterogeneity and anisotropy in the crack tip region during the fracture process. Appendix B provides tests extending the applicability of the same test procedure to rigid and semirigid thermoplastic or thermoset plastics containing such short fibers under defined conditions. Note 2: Since the model adopted assumes that the cracked material has linear elastic properties and the crack tip is in a plane strain state, in order to ensure the validity of the test, certain constraints are added to the linearity of the force-displacement curve, the width and thickness of the specimen. Restrictions (see 9.4). The cracks are sharp enough to prevent sharper cracks from causing a significant decrease in measured performance values.

GB/T 41932-2022 Referenced Document

• GB/T 1040.1 Plastics—Determination of tensile properties—Part 1:General principles
• GB/T 1041 Plastics.Determination of compressive properties
• GB/T 12160-2019 Metallic materials－Calibration of extensometers systems used in uniaxial testing
• GB/T 39812 Plastics—Preparation of test specimens by machining

GB/T 41932-2022 history

• 2022 GB/T 41932-2022 Plastics—Determination of fracture toughness (GIC and KIC)—Linear elastic fracture mechanics (LEFM) approach