Section 7 Bend tests
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Manufacture, Testing and Certification of Materials, July 2022 - Chapter 2 Testing Procedures for Metallic Materials - Section 7 Bend tests

Section 7 Bend tests

Parent topic: Chapter 2 Testing Procedures for Metallic Materials

7.1 Dimensions of test specimens

7.1.1 Flat bend test specimens are to be of rectangular cross-section with dimensions as defined in Figure 2.7.1 Bend test specimen.

Figure 2.7.1 Bend test specimen

7.1.2 For plates, sections and strip the dimensions shall be full thickness and width 30 mm. Where the rolled thickness exceeds 25 mm the compression face may be reduced to 25 mm.

7.1.3 For forgings, castings and semi-finished products the thickness shall be 20 mm and width 25 mm.

7.1.4 Butt weld face and root bend test specimens are to be 30 mm in width and of the full plate thickness. Where the thickness exceeds 12mm, two side bend test specimens may be tested in place of the face and root specimens specified. The side bend specimens should be 10 mm minimum thickness. The upper and lower surfaces of the weld are to be filed, ground or machined flush with the surface of the plate.

7.1.5 The edges on the tension side of bend samples are to be rounded to a radius of 1 to 2 mm.

7.2 Testing procedures

7.2.1 The bend sample is plastically deformed by plunging a mandrel between two fixed points as shown in Figure 2.7.2 Bend test.

Figure 2.7.2 Bend test

7.2.2 For aluminium welds a guided bend is required to ensure even deformation as shown in Figure 2.7.3 Guide bend test for aluminium.

Figure 2.7.3 Guide bend test for aluminium

7.2.3 Bend tests are to be conducted at ambient temperature at the highest convenient rate of bending (but not impact).

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