GB/T 232-2024 Metallic materials - Bend testing method
1 Scope
This document specifies a method for determining the ability of metallic materials to undergo plastic deformation in bending.
This document applies to test pieces taken from metallic products, as specified in the relevant product standard. It is not applicable to certain materials or products, for example tubes in full section or welded joints, for which other standards exist.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing (GB/T 2975-2018, ISO 377:2017, MOD)
3 Terms and definitions
No terms and definitions are listed in this document.
4 Symbols and designations
Symbols and designations used in this document are specified in Table 1.
Table 1 Symbols and designations
5 Principle
The bend test consists of submitting a test piece of round, square, rectangular or polygonal cross-section to plastic deformation by bending, without changing the direction of loading, until a specified angle of bend is reached.
During the bend test, the axes of two legs of the test piece remain in a plane perpendicular to the axis of bending. In the case of a 180° bend, the two lateral surfaces may, depending on the requirements of the product standard, lie flat against each other or can be parallel at a specified distance, and an insert may be used to control this distance.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and designations
5 Principle
6 Test equipment
6.1 General
6.2 Bending device with supports and a former
6.3 Bending device with a V-block
6.4 Bending device with a clamp
6.5 Other bending devices
7 Test piece
7.1 General
7.2 Edges of test pieces
7.3 Width of the test piece
7.4 Thickness of the test piece
7.5 Test pieces from forgings, castings and semi-finished products
7.6 Test pieces of greater thickness and width
7.7 Length of the test piece
8 Test procedure
9 Interpretation of results
10 Test report
Annex A (Normative) Bend test at plane strain conditions
A.1 Overview
A.2 General
A.3 Test piece
A.4 Assessment
A.5 Test report
Annex B (Informative) Determination of the angle of bend from the measurement of the displacement of the former
Bibliography
