Download scientific diagram | Typical sample for fatigue test according to ASTM E Standard. from publication: Effect of Hot Isostatic Pressure treatment on. ASTM E , Standard practice for conducting force controlled ASTM E , Standard terminology relating to fatigue and fracture testing 1). ASTM E covers axial force controlled fatigue tests of metallic materials in the fatigue regime where strains are predominately elastic, both at initial loading.
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ASTM E Load Controlled Constant Amplitude Fatigue Tests of Metals
Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:. Threaded end specimens may prove difficult to align and failure often initiates at these stress concentrations when testing in the life regime of interest in this practice. Select from list below: To ensure test section failure, the grip cross-sectional area should be at least 1. In the case of surfaces that are not smooth, due to the fact that some surface treatment or condition is being studied, the dimensions should be measured as above and the average, maximum, and minimum values reported.
The varying stress amplitude, as determined by a suitable dynamic veri? In view of this fact, the method of preparation should be agreed upon prior to the beginning of the test program by both the originator and the user of the fatigue data to be generated.
However, regardless of the nature of the forcing function, it should be reported e46, ramp, saw tooth, etc. Assurance that surface residual stresses are minimized can be achieved by careful control of the machining procedures. The trial specimen should be rotated about its longitudinal axis, installed and checked in both orientations within the? It is important that the accuracy of alignment be kept consistent from specimen to specimen.
This practice is not intended for asfm in axial fatigue tests of components or parts. Current edition approved Nov. This entire procedure should be clearly explained in the reporting since it is known to in? Obvious abnormalities, such as cracks, machining marks, gouges, undercuts, and so forth, are not acceptable.
As a cautionary note, should localized yielding occur, signi? Link to Active This link will always route to the current Active version of the standard. This knowledge and care provides the most meaningful and best possible high cycle fatigue life results.
We are confident that we have what you are looking for. Surfaces intended to be parallel and straight should be in a manner consistent with 8. The reduced section length should be greater than three times the minimum test section diameter. For example, specimen alignment is of utmost importance and the procedure outlined in Practice E would be advantageous. Failure may be de? Improper methods of preparation can greatly bias the test results. This avoids complications that prevent the true strength of the material from being evaluated.
For most conventional grips, good alignment must come about from very careful attention to design detail. For cylindrical specimens, alignment should be checked by means of a trial test specimen with longitudinal strain gages placed at four equidistant locations around the minimum diameter. In view of this, no maximum ratio of aatm grip to test section should apply. Thus, when embarking on a program of this nature it is essential to de? A caveat is given regarding the gage section with sharp edges that is, square or rectangular cross section since these are inherent weaknesses because the slip of the grains at sharp edges is not con?
The value of 1. Take care to adjust the specimen symmetrically to distribute the load uniformly over atsm cross ee466. It is advisable to determine these surface residual stresses with X-ray diffraction peak shift or similar techniques, and that the value of the surface residual stress be reported along with the direction of determination that is, longitudinal, transverse, radial, and so forth.
Place the specimen securely in the grips of the testing machine.
For tests run in compression, the length of the test section should be approximately two times the test section diameter to minimize buckling. In the typical regime of d466 Machining methods and techniques can strongly influence the fatigue life of a material. Specimens should be cleaned prior to testing with solvent s non-injurious and non-detrimental to the mechanical properties of the material in order to remove any surface oil?
One exception may be where these parameters are under study.
ASTM E466 – Force Controller Constant Amplitude Axial Fatigue Testing of Metallic Materials
Give our test engineers a call awtm for help configuring the best test machine and accessories according to ASTM E Fillet undercutting can be readily determined by inspection. The test may also be used as a guide to the selection of metallic materials for service under conditions of repeated direct stress. The acceptable ratio of the areas test section to grip section to ensure a test section failure is dependent on the specimen gripping method.
To do so would require the control or balance of what are often deemed nuisance variables; for example, hardness, cleanliness, grain size, composition, directionality, surface residual stress, surface finish, and so forth.
The following documents, although not directly referenced in the text, are considered important enough to be listed in this practice: ASTM International takes no position respecting the validity of any patent rights asserted in connection e4466 any item mentioned in this standard.
ASTM E466 Load Controlled Constant Amplitude Fatigue Tests of Metals
Otherwise, the same dimensional relationships should apply, as in the case of the specimens described in 5. Historical Version s – view previous versions of standard. The test section length should be approximately two to three times the test section width of the specimen. Every effort should be made to prevent the occurrence of misalignment, either due to twist rotation of the gripsor to a displacement in their axes of symmetry.
The ASTM E axial load fatigue test is used to determine the effect of variations in material, geometry, surface condition, stress, etc. Thus, e646 embarking on a program of this nature it is essential to define and maintain consistency a priori, as many variables as reasonably possible, with as much economy as prudent.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The results may also be e4666 as a guide for the selection of metallic materials for service under conditions of repeated direct stress.