ISO 6892-1-2009 pdf free download

ISO 6892-1-2009 pdf free download.Metallic materials — Tensile testing — Part 1:Method of test at room temperature.
Matérlaux metalliques — Essal de traction — Partie 1: Méthode dessai a temperature ambiante.
EXAMPLE 3 Iso 6892.1:2009 B defines a test based on stress rate, performed at a nominal stress rate according to Table 3.
11 Determination of the upper yield strength
ReH may be determined from the force-extension curve or peak load indicator and is defined as the maximum value of stress prior to the first decrease In force. The latter is obtained by dividing this force by the original cross-sectional area of the test piece, S0 (see Figure 2).
12 Determination of the lower yield strength
ReL Is determined from the force-extension curve and is defined as the lowest value of stress during plastic yi&ding, ignoring any initial transient effects. The latter is obtained by dividing this force by the original cross- sectional area of the test piece, S0 (see Figure 2).
For productivity of testing, ReL may be reported as the lowest stress within the first 0,25 % strain after ROH, not taking into account any initial transient effect. After determining Rei by this procedure, the test rate may be increased as per 10.3.4. Use of this shorter procedure should be recorded on the test report.
NOTE This clause only applies to materials having yield phenomena and when .4 is not to be determined.
13 Determination of proof strength, plastic extension
13.1 Rp is determined from the force-extension curve by drawing a line parallel to the linear portion of the curve and at a distance from it equivalent to the prescribed plastic percentage extension, e.g. 0,2 %. The point at which this line intersects the curve gives the force corresponding to the desired proof strength plastic extension. The latter is obtained by dividing this force by the original cross-sectional area of the test piece, S0 (see Figure 3).
If the straight portion of the force-extension curve is not clearly defined, thereby preventing drawing the parallel line with sufficient precision, the following procedure is recommended (see FIgure 6).
When the presumed proof strength has been exceeded, the force is reduced to a value equal to about 10 % of the force obtained. The force is then increased again until it exceeds the value obtained originally. To determine the desired proof strength, a line is drawn through the hysteresis loop. A line is then drawn parallel to this line, at a distance from the corrected origin of the curve, measured along the abscissa, equal to the prescribed plastic percentage extension. The intersection of this parallel line and the force-extension curve gives the force corresponding to the proof strength. The latter is obtained by dividing this force by the original cross-sectional area of the test piece, S, (see Figure 6).ISO 6892-1-2009 pdf free download.