This standard specifies the application scope, normative references, testing principle, symbol, terms and definitions, test pieces, test equipment and apparatus, test, test result treatment and test report of the creep and stress-rupture test in tension of metallic materials.
The methods in this standard are applicable to determine mechanical properties of metallic materials:
a) Steady creep rate
b) Creep limit
c) Creep elongation
d) Permanent rupture time
e) Endurance strength limit
f) Permanent percentage elongation and percentage reduction of area after creep rupture
g) Permanent notch sensitivity factor
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard and valid when this standard is published. All standards are subject to revision, and users of this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 8170-87 "Rules for Rounding off of Numerical Values"
GB 10623-89 "Metallic Materials-Terms of Mechanical Test"
JJG 141-83 "Verification Regulation of the Industrial 10% Rhodium/Platinum-Platinum Thermo Couple"
JJG 276-88 "Verification Regulation of High-Temperature Creep and Stress-Rupture Testing Machines"
JJG 351-84 "Verification Regulation of Working Ni-Cr/Ni-Si and Ni-Cr/Chromel-copel Thermocouples"
JJG 368-84 "Verification Regulation of Working Copper/Copper-Nickel Thermocouple"
3 Test Principle
The test consists of heating a test piece to the specified temperature and of straining the test piece by means of a constant tensile force or constant tensile stress applied along its longitudinal axis for a period of time to obtain a specified creep elongation or the creep rupture, and measuring the creep or enduring quality.
