Bending test is applied to determine behaviors of materials against bending stresses and deformations. The deformations that occur when a force is applied to the middle of a rectangular or round test specimen placed on two supports without changing direction is called bending. Inner surface of the test specimen is compressed, but the outer surface is strained.
Discontinuities are detected at the weld seam surface and surrounding material by means of bending test. In addition to qualitative properties, quantitative values such as bending moment, bending strength, E–modulus and bending displacement can also be determined.
TS EN ISO 7438: Metallic materials – Bend test
For determining the ability of metallic materials to undergo plastic deformation in bending. This International Standard 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.
TS 205-4 EN ISO 8491: Metallic materials – Tube (in full section) – Bend test
For determining the ability of full-section metallic tubes of circular cross-section to undergo plastic deformation in bending.
TS EN ISO 5173: Destructive tests on welds in metallic materials – Bend tests
ASTM E190, ASME IX, AWS, API1104