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# About elongation after metal breaking

by：Sinowon     2021-07-01
About elongation after metal breaking

About the elongation of metal after breaking, your company cannot automatically measure the elongation after breaking of our testing machine. Our company explains as follows: 1: The measuring method of elongation after breaking is to do the following work 1-1: First of all To know the sample ∫ use the sixth sheet of the standard to see how the gauge length is calculated: 6 sample 6 1 shape and size 6. 1.1 general requirements The shape and size of the sample depends on the metal product to be tested Shape and size. Generally, samples are cut from products, pressed billets or ingots and machined to make test specimens. However, products with constant cross-sections (profiles, bars, wires, etc.) and cast samples (cast iron and cast non-ferrous alloys) can be tested without machining. The cross-section of the sample can be round, rectangular, polygonal, or annular , It can be some other shapes under special circumstances. The sample whose original gauge length is related to the original cross-sectional area is called the proportional sample. The value of the ratio coefficient k used internationally is 5.65. The original gauge length should not be less than 15 mm. When the cross-sectional area of u200bu200bthe sample is too small, so that the value of the scale factor k of 5.65 cannot meet this minimum gauge length requirement, a higher value can be used (the value of 11.3 is preferred) or a non-standard value can be used. Proportional sample. The original gauge length (L o) of non-proportional specimens has nothing to do with its original cross-sectional area (S. ). Example: If my sample is 4mm in width and 4mm in thickness, then my gauge length is substituted into the formula u003d5.65×√4*4 u003d5.65*4 u003d22.6, that is, the gauge length of the sample is 22.6mm. Know the gauge length, how should we do the experiment: We quote the standard, so our correct test method is: draw a line at the beginning of the sample:, draw a mark every 22.6 mm until the end, and then on the testing machine Do a test to see where the breaking point of the sample is, and then connect it. Measure its deformation, and then substitute the formula to calculate the elongation after breaking. For the user, install a sensor on the sample (if the elongation can be measured, To meet the following condition 1: The gauge length of the extensometer is equal to the gauge length of the sample (this is impossible because the gauge length of the extensometer is an integer, such as 5 mm. 10 mm. 20 mm. 25 mm... The gauge length of the sample is determined by its own cross-section, so the gauge length of the sample cannot be equal to the gauge length of the extensometer, so it is not possible to use the gauge length of the extensometer as the gauge length of the sample)
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