ISO 10113-2020 pdf free.Metallic materials – Sheet and strip – Determination of plastic strain ratio.
The law of constancy of volume is only applicable up to the percentage of plastic extension at maximum force, Ag because after this point local necking starts and the used mathematical approaches are no longer valid.
Several materials clearly show a slight local necking before A . This can lead to higher instantaneous width reduction values and results in higher r-values, especialy when an extensometer is used which measures the instantaneous width reduction only in the central region of the gauge length. In these cases, the following points are recommended:
a) extensometers for measurement of the instantaneous width reduction which are able to measure the change of width in multiple locations ideally evenly distributed across the entire gauge length (see Clause 6) should be used;
b) the parallel length of the test piece should be minimum six times of the original gauge width of the test piece b0.
The orientation of the test piece relative to the rolling direction, and the plastic (engineering) strain for which the values of r are determined, are as specified in the relevant product standards.
An r-value greater than one describes a behaviour where the material deforms more in the width than in the thickness ( b> p a see Figure 1). An r-value lower than one describes a behaviour where the material deforms more in the thickness than in the width ( b < a see Figure 1). An r-value of one describes an isotropic forming behaviour in width and thickniss (i = epa; see Figure 1).The tensile testing machine used shall comply with the requirements of ISO 6892-1.
For the manual method (see &Z) 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 B.13), 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 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 ±0,0 1 mm.
The method of gripping the test piece shall be as specified in ISO 6892-1.ISO 10113 pdf download.
Tags: Metallic materials
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