鸭脖娱乐

? Set as home page | Add to collection | contact us
?
Company news
·Current location: Home page ?>> news information ?>>? Company news
Metallic materials - room temperature tensile test methods - Determination of elongation after fracture
December 6, 2016 source: navigation instruments Author: editor in chief
Metallic materials - room temperature tensile test methods - Determination of elongation after fracture
Determination of elongation after fracture and total elongation at break:
The elongation after fracture shall be determined according to the definition of elongation after fracture.
In order to determine the elongation after fracture, the broken parts of the sample should be carefully matched together to make their axes in the same straight line, and special measures should be taken to ensure that the broken parts of the sample are in proper contact, and then the gauge distance after fracture of the sample is measured. This is particularly important for small cross-section specimens and low elongation specimens.
The accuracy of measuring distance from 0.25 mm to 0.25 mm is better than that of 0.25 mm. If the specified minimum elongation after fracture is less than 5%, it is recommended to use a special method for determination [see Appendix E (suggested appendix)].
In principle, only when the distance between the fracture and the nearest gauge mark is not less than one third of the original gauge length is effective. However, if the elongation after fracture is greater than or equal to the specified value, the measurement is valid no matter where the fracture position is.
For the testing machine that can measure the elongation at fracture with extensometer, the gauge distance (L) of extensometer should be equal to the original gauge length (L) of the specimen, and it is not necessary to mark the original gauge length of the specimen. Taking the total elongation at break as the elongation, the elastic elongation should be deducted from the total elongation.
Related information