GB/T 42614-2023Plain bearings - Metallic thin-walled half bearings without flange - Determination of the sigma0.01*-limit (English PDF)

1 Scope

This document describes the method for the determination of the limit value of sigma*0:01 for multilayer metal flangeless thin-walled bearing shell steel backs:

This document applies to multi-layer metal flangeless thin-walled bearings with an outer diameter Do<=80mm, and can also be used for bearings with an outer diameter Do<=160mm:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

GB/T 7308:3 Sliding bearings with flanges or flangeless thin-walled bearings Part 3: Measurement of circumference (GB/T 7308:3-

2021, ISO 3548-3:2012, MOD)

3 Terms and Definitions

The following terms and definitions apply to this document:

3:1

sigma*0:01 limit value sigma*0:01-limit

Circumferential compressive stress that causes 0:01% permanent deformation on the circumference of the bearing bush:

Note: Due to the difference between the bearing pad and the general compression test sample in geometric shape and detection loading method, the limit value of sigma*0:01 is different from the limit value of sigma0:01: In order to distinguish, the bearing pad

The sigma0:01 limit values are marked with an asterisk (*):

3:2

F/Acal

The ratio of the normal pressure (vertical load) (F) applied to the cross-sectional area of the bearing pad to the cross-sectional area (Acal) obtained by calculation:

Note 1: The unit of F is Newton (N), the unit of Acal is square millimeter (mm2), and the unit of F/Acal is megapascal (MPa), that is, Newton per square millimeter (N/mm2):

Note 2: For the most common material combinations, the calculation of the cross-sectional area (Acal) refers to GB/T 7308:1, and the calculation formula is as follows:

Steel/lead-based alloy or steel/tin-based alloy: Acal=B1×s1

Steel/copper base alloy: Acal=B1×s1 s2

Steel/aluminum base alloy: Acal=B1×s1 s2

In the formula:

B1 --- bearing width, in millimeters (mm);

s1 --- the thickness of the steel back layer of the bearing bush, in millimeters (mm);

s2 --- The thickness of the alloy layer of the bearing bush, in millimeters (mm):

Note 3: If the annular oil groove and (or) the chamfer extends to the steel back layer, the cross-sectional area of the steel back is reduced accordingly for calculation: […]