ايزو 6892 Metallic materials — Tensile testing —Part 1:طريقة الاختبار في درجة حرارة الغرفة
1 نطاق
This part of ISO 6892 specifies the method for tensile testing of metallic materials and defines the mechanical
properties which can be determined at room temperature.
NOTE Annex A indicates complementary recommendations for computer controlled testing machines.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ايزو 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing
ايزو 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels
ايزو 2566-2, Steel — Conversion of elongation values — Part 2: Austenitic steels
ايزو 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ايزو 9513, Metallic materials — Calibration of extensometers used in uniaxial testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 gauge length L
length of the parallel portion of the test piece on which elongation is measured at any moment during the test
3.1.1 original gauge length Lo
length between gauge length (3.1) marks on the piece measured at room temperature before the test
3.1.2 final gauge length after rupture Lu
length between gauge length (3.1) marks on the test piece measured after rupture, at room temperature, the
two pieces having been carefully fitted back together so that their axes lie in a straight line
NOTE Adapted from ISO/TR 25679:2005[3].
3.2 parallel length Lc
length of the parallel reduced section of the test piece.
3.3 elongation
increase in the original gauge length (3.1.1) at any moment during the test
3.4 percentage elongation
elongation expressed as a percentage of the original gauge length, Lo (3.1.1)
3.4.1 percentage permanent elongation
increase in the original gauge length (3.1.1) of a test piece after removal of a specified stress, expressed as a percentage of the original gauge length, Lo
3.4.2 percentage elongation after fracture A
permanent elongation of the gauge length after fracture, (Lu − Lo), expressed as a percentage of the original
gauge length, Lo 1) 5,65 So=5 (4So/ð) .
3.5 طول مقياس التمدد Le
initial extensometer gauge length used for measurement of extension by means of an extensometer
امتداد
increase in the طول مقياس التمدد, Le (3.5), at any moment during the test
3.6.1 percentage extension
“strain”
extension expressed as a percentage of the طول مقياس التمدد, Le (3.5)
3.6.2 percentage permanent extension
increase in the extensometer gauge length, after removal of a specified stress from the test piece, expressed
as a percentage of the طول مقياس التمدد, Le (3.5)
3.6.3 percentage yield point extension
See Figure 7.
3.6.4 percentage total extension at maximum force Agt
total extension (elastic extension plus plastic extension) at maximum force, expressed as a percentage of the
طول مقياس التمدد, Le (3.5)
3.6.5 percentage plastic extension at maximum force Ag
plastic extension at maximum force, expressed as a percentage of the طول مقياس التمدد, Le (3.5)
3.6.6 percentage total extension at fracture At
total extension (elastic extension plus plastic extension) at the moment of fracture, expressed as a percentage
of the طول مقياس التمدد, Le (3.5)
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