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Reg. 19
MATERIALS OF CONSTRUCTION

STEEL PLATES, RIVETS, SECTION AND BARS IN CARBON STEEL

Bend Tests

Cold Bends.-(a) Test pieces shall be sheared lengthwise or crosswise from plates or bars, and shall not be less than 1½ inches wide, but for small bars the whole section may be used. For rivet bars bend tests are not required.

b) In all cold bend tests, on samples 0.5 inch in thickness and above, the rough edge or arris caused by shearing may be removed by filing or grinding, and samples 1 inch in thickness and above may have the edges machined, but the test pieces shall receive no other preparation. The test pieces shall not be annealed unless the material from which they are cut is similarly annealed in which case the test piece shall be similarly and simultaneously treated with the material before testing. 

(c) (i) For bend test of plates of all grades of steel, the test piece shall withstands, without fracture, being bent cold through 180o around a mandrel, the radius of which shall have a relationship to the plate thickness as given below:

      Tensile strength                          Mandrel Radius

      36 - 49 kg./mm2                              1 T

      41 - 57 kg./mm2                              1 T

      45 - 64 kg./mm2                            1.5 T

where T = Plate thickness  

(ii) For cold bend test of sections and bars, the test piece shall withstand, without fracture, being doubled over until the internal radius is equal to that shown in Table under regulation 16 and the limbs are parallel.

 

(d) For small sectional material these bend tests may be made from the flattened bar.

(e) Bend tests may be made either by pressure or by blows.

 
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