ISO 22407 Fatigue testing Axial plane bending test machine,
Rotating bar bending fatigue testing machine by rotating rod bending, rotational bending test ,
ISO 22407 standard specifies the method for rotating bar bending fatigue testing of metallic materials. Tests are performed at room temperature or at elevated temperature in air by rotating the sample. ISO 22407 specifies the conditions for conducting the plane bending fatigue test on an axial machine, constant-amplitude, force or displacement controlled, at room temperature (ideally between 10 °C and 35 °C) on metallic specimens, without deliberately introduced stress concentrations. This document does not include the reversed/partially loading test. The purpose of the test is to provide relevant results, such as the relation between applied stress and number of cycles to failure for a given material condition, expressed by hardness and microstructure, at various stress ratios.
Each specimen is rotated and subjected to a constant bending moment. The force causing the bending moment does not rotate. The specimen can be subjected to single or double point loading in the form of a cantilever beam, or tested as a beam in the form of a four point loading. The test will continue until the specimen fails or reaches the predetermined number of stress cycles, with one stress cycle corresponding to the complete rotation of the specimen.
All specimens in the test series used for fatigue life determination must have the same size, shape, and diameter tolerances. The actual minimum diameter of each specimen should be measured with an accuracy of 0.01 millimeters to calculate the applied force and obtain the required stress. Before conducting the test, care must be taken when measuring the sample to ensure that the surface is not damaged. It is important to follow some recommendations when preparing samples in any rotating rod bending fatigue testing program aimed at characterizing the intrinsic properties of materials.
ISO 22407 is a standard for fatigue testing of metal materials by rotating rod bending, which specifies in detail how to design and perform rotating rod bending fatigue tests to evaluate the fatigue performance of metal materials.
Test objective: To evaluate the fatigue performance of metal materials under rotational bending conditions.
Scope of application: Suitable for various metal materials, including steel, aluminum alloys, etc. Testing principle: The specimen is rotated at a specified speed and subjected to bending load on the testing machine until it fractures or reaches the preset number of cycles.
This standard provides a detailed description of the construction and operation methods of testing equipment, including rotary bending testing machines, specimen fixtures, loading systems, and measurement systems.
Beam type, four points loading
