GB/T 10424-2025Sintered metal friction materials — Determination of compressive strength (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 10424-2002 "Determination of compressive strength of sintered metal friction materials" and is consistent with GB/T 10424-2002.

In addition to structural adjustments and editorial changes, the main technical changes are as follows.

--- Added the terms "compressive strength" and "relative compressibility" and their definitions (see Chapter 3);

--- Increased test environment requirements (see Chapter 4);

--- Changed the accuracy requirements of the testing machine (see 5.1, 4.1 of the 2002 edition);

--- Added requirements for extensometers, safety protection devices, and specimen size measuring instruments (see 5.2, 5.4, 5.5);

--- Added requirements for sample preparation and sample quantity (see 6.2, 6.3);

--- Added "Test steps" to clarify the sample preparation, sample measurement, test speed and test requirements (see Chapter 7);

--- Changed the requirements for rounding off of test results (see 8.3, 8.1 of the 2002 edition);

--- Increased uncertainty requirements (see Chapter 9);

--- Changed the requirements for the content of the test report (see Section 10.2, 8.2 of the 2002 edition).

1 Scope

This document specifies the method for determining the room temperature compressive strength and relative compressibility of sintered metal friction materials.

This document is applicable to the determination of room temperature compressive strength and relative compressibility of sintered metal friction materials.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 228.1-2021 Tensile testing of metallic materials Part 1: Room temperature test method

GB/T 6525-2019 Determination of compressive strength of sintered metal materials at room temperature

GB/T 8170 Rules for rounding off values and expression and determination of limit values

GB/T 12160 Calibration of extensometer systems for uniaxial testing of metallic materials

GB/T 16825.1 Inspection and calibration of static uniaxial testing machines for metallic materials Part 1: Tension and/or compression testing machines Inspection and calibration of force measurement systems

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Principles

The stress is obtained by dividing the maximum load that a cylindrical specimen can withstand under axial compression until failure by the cross-sectional area of the original specimen. force as compressive strength.

Unless otherwise specified, the test is generally carried out at room temperature within the range of 10°C~35°C. For tests with strict temperature requirements, the test temperature should be 23°C±5°C.