ISO 10113:2020 pdf free
ISO 10113:2020 pdf free.Metallic materials一Sheet and strip一Determination of plastic strain ratio
The plastic strain ratio r is often used for the characterisation and qualification of materials, and for the numerical simulation of forming processes.
To determine the plastic strain ratio, a test piece is subjected to a tensile test to a specified plastic (engineering) strain and the plastic strain ratio, r, is calculated from measurements of the changes in width and thickness after unloading or after subtraction of the elastic strains. However, it is easier and more precise to measure changes in length than in thickness. Therefore, the plastic strain ratio r is typically derived from changes in length and width using the law of constancy of volume, see Formula (5).
For the manual method (see 8.2), the device for the measurement of the original gauge length and the gauge length after plastic straining and unloading shall be capable of measuring with an accuracy of ±0,2 % or better. The device used for determining the original width and the gauge width of the test piece after plastic straining and unloading shall be capable of measuring with an accuracy of ±0,005 mm or better.
For the semi-automatic method (see 8.3), an extensometer for length measurement in accordance with ISO 9513, of class 1 or better, shall be used. The device used for determining the original width and the gauge width of the test piece after plastic straining and unloading shall be capable of measuring with an accuracy of ±0,005 mm or better.
For the automatic method (see 8.4), extensometers in accordance with ISO 9513, of class 1 or better in the relevant strain range, shall be used. The device used for determining the original width shall be capable of measuring with an accuracy of±0,1 % or better.
NOTE When using a long gauge length and large extensions are applied, the maximum error of the class 1 extensometer can be greater than ±0,01 mm.ISO 10113 pdf free download.
