AS 1391 pdf download – Metallic materials-Tensile testing at ambient temperature
3.15Percentage total elongation at fracture (A)
Total elongation (elastic elongation plus plastic elongation) of the gauge length at themoment of fracture expressed as a percentage of the original gauge length (Lo).
3.16 Percentage permanent extension
Increase in the extensometer gauge length, after removal of a specified stress from the testpiece, expressed as a percentage of the extensometer gauge length (L.).
3.17 Percentage plastic clongation without necking (Awn)
The plastic elongation measured at a minimum distance from the fracture expressed as apercentage of the gauge length specified in the product Standard.
3.18 Percentage reduction of area (Z)
Maximum change in cross-sectional area (S%- S%), which has occurred during the testexpressed as a percentage of the original cross-sectional area (So).
3.19 Percentage total extension at maximum force (zt)
Total extension (elastic plus plastic) at maximum force,expressed as a percentage of theextensometer gauge length (Le).
3.20 Percentage yield point extension (A)
ln discontinuous yielding materials，the extension between the start of discontinuousyielding and the start of uniform work hardening. It is expressed as a percentage of theextensometer gauge length (L).
3.21 Permanent set strength (R,)
Stress at which，after removal of force，a specified permanent elongation or extensionexpressed respectively as a percentage of the original gauge length (L) or extensometergauge length (L) has not been exceeded (see Figure 5).
The symbol used is followed by a suffix giving the specified percentage of the originalgauge length (L) or of the extensometer gauge length (L), for example Rt0.2
3.22 Proof strength, plastic extension (R,)
Stress at which a plastic extension is equal to a specified percentage of the extensometergauge length (L)(see Figure 3). The symbol used is followed by a suffix giving theprescribed percentage, for example Rpo.2-
3.23 Proof strength, total extension (R;)
Stress at which total extension (elastic extension plus plastic extension) is equal to aspecified percentage of the extensometer gauge length(L), (see Figure 4). The symbol usedis followed by a suffix giving the prescribed percentage for example Ro.s.
3.24 Reference condition
Condition of a sample specimen or test piece having undergone a heat treatment torepresent the intended final condition of the product.
NOTE: In such cases the sample, specimen or test piece is called the reference sample,referencerough specimen or reference test piece.
3.25Tensile strength (Rm)
Stress corresponding to the maximum force (Fm), excluding the upper yield force.
3.26Test pieces3.26.1 Test piece
A prepared piece for testing made from or comprising a test specimen.3.26.2 Longitudinal test piece
A test piece in which the longitudinal axis is parallel to the principal direction of the finalprocessing.
3.26.3Transverse test piece
A test piece in which the longitudinal axis is at right angles to the principal direction offinal processing.
3.27 Test sample
A portion of material, a product, or a group of items selected by a sampling procedure froma batch.
A portion of a single item taken from the test sample for the purpose of testing.3.29 True stress
Force at any moment during the test divided by the instantaneous cross sectional area of thetest piece.
3.30 Upper yield strength (R)
Value of stress at the moment when the first decrease in force is observed (see Figure 2).3.31Yield strength
When the metallic material exhibits a yield phenomenon, a point is reached during the testat which plastic deformation occurs without any increase in the force.
The test shall be carried out at ambient temperature between 10°C and 35°C，unlessotherwise specified.Tests carried out under controlled conditions shall be made at atemperature of 23 C士5°C.
5 SYMBOLS AND DESIGNATIONS
Symbols and corresponding designations are given in Table 1.