ISO 6892 Metallic materials — Tensile testing —Phần 1:Phương pháp kiểm tra ở nhiệt độ phòng
1 Scope
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.
LƯU Ý: Phụ lục A chỉ ra các khuyến nghị bổ sung cho các máy kiểm tra điều khiển bằng máy tính.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, Chỉ áp dụng phiên bản được trích dẫn. Đối với tài liệu tham khảo không ghi ngày tháng, the latest edition of the referenced
document (including any amendments) applies.
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing
ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels
ISO 2566-2, Steel — Conversion of elongation values — Part 2: Austenitic steels
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 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 Một
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 chiều dài máy đo độ giãn dài Le
initial extensometer gauge length used for measurement of extension by means of an extensometer
phần mở rộng
increase in the chiều dài máy đo độ giãn dài, Le (3.5), at any moment during the test
3.6.1 percentage extension
“strain”
extension expressed as a percentage of the chiều dài máy đo độ giãn dài, 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 chiều dài máy đo độ giãn dài, Le (3.5)
3.6.3 percentage yield point extension
See Figure 7.
3.6.4 percentage total extension at maximum force Mộtgt
total extension (elastic extension plus plastic extension) at maximum force, expressed as a percentage of the
chiều dài máy đo độ giãn dài, Le (3.5)
3.6.5 percentage plastic extension at maximum force Mộtg
plastic extension at maximum force, expressed as a percentage of the chiều dài máy đo độ giãn dài, Le (3.5)
3.6.6 percentage total extension at fracture Mộtt
total extension (elastic extension plus plastic extension) at the moment of fracture, expressed as a percentage
of the chiều dài máy đo độ giãn dài, Le (3.5)
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