GB/T 40398.1-2021 English PDF (GBT40398.1-2021)

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GB/T 40398.1-2021: Test method for C-C composites -- Part 1: Friction and wear property
GB/T 40398.1-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.050
CCS Q 50
Test method for C-C composites - Part 1.Friction and wear
property
ISSUED ON. AUGUST 20, 2021
IMPLEMENTED ON. MARCH 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 
Introduction... 4 
1 Scope... 5 
2 Normative references... 5 
3 Terms and definitions... 5 
4 Principle... 6 
5 Test equipment... 6 
6 Samples... 7 
7 Test environment... 8 
8 Test procedures... 8 
9 Calculation... 10 
10 Test report... 12 
Test method for C-C composites - Part 1.Friction and wear
property
1 Scope
This document specifies the principle, test equipment, samples, test environment, test
procedures, calculation and test report of the friction and wear property test for C-C
composites.
This document applies to the determination of friction and wear property of C-C
composites under laboratory conditions.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 1446, Fiber-reinforced plastics composites - The generals
GB/T 33501-2017, Test method for tensile property of C/C composites
3 Terms and definitions
Terms and definitions determined by GB/T 33501-2017 and the following ones are
applicable to this document.
3.1
C-C composites
Carbon fiber-reinforced carbon matrix composites.
3.2
The ratio of energy to area
The energy carried by the friction pair per unit area.
3.3
The ratio of energy to mass
The energy carried by the friction pair per unit mass.
3.6
Linear wear
The ratio OF the average thickness difference of the friction pair before and after the
test TO the number of tests.
3.7
Mass wear
The ratio OF the mass difference of the friction pair before and after the test TO the
number of tests.
3.8
Interface pressure
The ratio of the vertical pressure on the contact surface to the macroscopic contact area.
4 Principle
This method simulates the ratio of energy to area and the ratio of energy to mass under
the actual working conditions of the material, that is, after the carbon-carbon friction
pair is accelerated to a specified speed along with the established inertia of the friction
testing machine, an axial load is immediately applied to the friction pair, for inertial
braking, until it stops completely. During the braking process, collect data for each
parameter of the test to determine the friction and wear property of the C-C composites.
5 Test equipment
5.1 Testing machine
The testing machine adopts the frictional thermal shock test method, and conducts the
dynamic simulation test of the laboratory small sample scale of C-C composites under
the simulated actual working conditions, which can meet the functions of automatic
collection, processing and result output of parameters such as braking pressure, speed,
time, braking torque, friction coefficient, braking power and absorbed energy. Among
them, the speed control error, pressure control error and torque control error of the
testing machine are ±1% of the full scale; the inertia error of the test configuration shall
not be greater than 0.01 kg·m2.
5.2 Measurement equipment
5.2.1 Micrometer
6.2 Sample preparation
The sample preparation shall follow the following principles.
a) After the sample piece is cut from the product, the rotating ring, stationary ring
and corresponding friction surface shall be marked in time;
b) The processed samples shall be visually inspected for appearance, and there shall
be no defects such as fiber peeling, holes, falling edges and corners.
6.3 Number of samples
The valid sample for friction and wear is 1 pair.
7 Test environment
The laboratory environment shall meet the normal testing requirements of the
instrument.
8 Test procedures
8.1 Preparation before the test
8.1.1 Visually inspect the friction pair to ensure that there is no blockage, peeling, etc.,
and number the rotating and stationary rings of the friction pair.
8.1.2 Check the air pressure system of the testing machine and debug the torque zero
point.
8.2 Running-in test
8.2.1 Assemble the friction pair on the testing machine.
8.2.2 Start the testing machine and carry out the running-in test according to the test
parameters in Table 2.After the running-in test, the friction surface of the friction pair
shall be at least 80% in contact with each other.