Metallic materials - Very high cycle fatigue - Ultrasonic fatigue test method
1 Scope
This document specifies the specimen, test apparatus, test procedures and test report of ultrasonic fatigue test method for ultra-high cycle fatigue of metallic materials at room temperature.
This document is applicable to ultra-high cycle fatigue test with a test frequency of 20,000 Hz ± 500 Hz, a single-end axial excited vibration and a stress ratio R=-1.
Fatigue tests of other stress ratios or ultrasonic resonance frequencies may refer to this method, and the corresponding specimens should be designed and verified separately.
Notched specimens are not included in this document, but the fatigue test procedures specified in this document may be applied to the very high cycle fatigue test of notched specimens.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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.
GB/T 2614 Nickel-Chromium/Nickel-Silicon thermocouple wires
GB/T 3075 Metallic materials - Fatigue testing - Axial force-controlled method
GB/T 38897 Non-destructive testing - Measurement method for material elastic modulus and Poisson's ratio using ultrasonic velocity
JJF 1305 Calibration specification for linear displacement sensors
JJG 623 Resistance strain gauge indicators
JJG 856 Radiation thermometer for work
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3075 and the following apply.
3.1
very high cycle fatigue
fatigue with cycles greater than 107
3.2
ultrasonic fatigue test
fatigue test with cyclic stress applied at ultrasonic resonance frequency
3.3
ultrasonic fatigue specimen
fatigue specimens that meet ultrasonic frequency resonance requirements
4 Symbols and designations
See Table 1 for symbols used in this document and their corresponding interpretations.
Contents
Foreword III
Introduction IV
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and designations
5 Principle
6 Specimen
7 Test apparatus
8 Test procedures
9 Test report
Annex A (Informative) Design of ultrasonic fatigue specimen
Annex B (Informative) Stress control method of ultrasonic fatigue specimens with different shapes
Reference
