ISO 7438:2016 pdf free
ISO 7438:2016 pdf free.Metallic materials – Bend test
The device consists of a clamp and a former of sufficient hardness; it may be equipped with a lever for applying force to the test piece (see Figure 3).
Because the position of the left face of the clamp could influence the test results, the left face of the clamp (as shown in Figure 3) should not reach up to or beyond the vertical line through the centre of the circular former shape.
Round, square, rectangular, or polygonal cross-section test pieces shall be used in the test. Any areas of the material affected by shearing or flame cutting and similar operations during sampling of test pieces shall be removed. However, testing a test piece, the affected parts of which have not been removed, is
acceptable, provided the result is satisfactory.
The edges of rectangular test pieces shall be rounded to a radius not exceeding the following values:
一3 mm, when the thickness of the test pieces is 50 mm or greater;
一1,5 mm, when the thickness of the test pieces is less than 50 mm and more than or equal to10 mm (inclusive);
一1 mm when the thickness is less than 10 mm.
The rounding shall be made so that no transverse burrs, scratches or marks are formed which might adversely affect the test results. However, testing a test piece, the edges of which have not been rounded, is acceptable, provided that the result is satisfactory.
Unless otherwise specified in the relevant standard, the width of the test piece shall be as follows:
a) the same as the product width, if the latter is equal to or less than 20 mm;
b) when the width of a product is more than 20 mm:
1) (20±5) mm for products of thickness less than 3 mm,
2) between 20 mm and 50 mm for products of thickness equal to or greater than 3 mm.ISO 7438 pdf download.
