ASTM E606 PDF

Want this as a site license? Scope 1. It is intended as a guide for fatigue testing performed in support of such activities as materials research and development, mechanical design, process and quality control, product performance, and failure analysis. While this practice is intended primarily for strain-controlled fatigue testing, some sections may provide useful information for load-controlled or stress-controlled testing.

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More E The nature of strain-controlled fatigue imposes distinctive requirements on fatigue testing methods. In particular, cyclic total strain should be measured and cyclic plastic strain should be determined. Furthermore, either of these strains typically is used to establish cyclic limits; total strain usually is controlled throughout the cycle.

The uniqueness of this test method and the results it yields are the determination of cyclic stresses and strains at any time during the tests. Differences in strain histories other than constant-amplitude alter fatigue life as compared with the constant amplitude results for example, periodic overstrains and block or spectrum histories. Likewise, the presence of nonzero mean strains and varying environmental conditions may alter fatigue life as compared with the constant-amplitude, fully reversed fatigue tests.

Care must be exercised in analyzing and interpreting data for such cases. In the case of variable amplitude or spectrum strain histories, cycle counting can be performed with Practice E Information obtained from strain-controlled fatigue testing may be an important element in the establishment of design criteria to protect against component failure by fatigue.

Results of a strain-controlled fatigue test program may be used in the formulation of empirical relationships between the cyclic variables of stress, total strain, plastic strain, and fatigue life. They are commonly used in data correlations such as curves of cyclic stress or strain versus life and cyclic stress versus cyclic plastic strain obtained from hysteresis loops at some fraction often half of material life. Examination of the cyclic stress—strain curve and its comparison with monotonic stress—strain curves gives useful information regarding the cyclic stability of a material, for example, whether the values of hardness, yield strength, ultimate strength, strain-hardening exponent, and strength coefficient will increase, decrease, or remain unchanged that is, whether a material will harden, soften, or be stable because of cyclic plastic straining 1.

Information about strain rate effects, relaxation behavior, and creep also may be available from these tests. Results of the uniaxial tests on specimens of simple geometry can be applied to the design of components with notches or other complex shapes, provided that the strains can be determined and multiaxial states of stress or strain and their gradients are correctly correlated with the uniaxial strain data.

Scope 1. It is intended as a guide for fatigue testing performed in support of such activities as materials research and development, mechanical design, process and quality control, product performance, and failure analysis. While this test method is intended primarily for strain-controlled fatigue testing, some sections may provide useful information for force-controlled or stress-controlled testing.

No restrictions are placed on environmental factors such as temperature, pressure, humidity, medium, and others, provided they are controlled throughout the test, do not cause loss of or change in dimension with time, and are detailed in the data report.

The term plastic is used herein to refer only to the time-independent that is, noncreep component of inelastic strain. To truly determine a time-independent strain the force would have to be applied instantaneously, which is not possible. A useful engineering estimate of time-independent strain can be obtained when the strain rate exceeds some value.

This value should increase with increasing test temperature. Testing is limited to strain-controlled cycling. The test method may be applied to hourglass specimens, see Fig. Testing is done primarily under constant amplitude cycling and may contain interspersed hold times at repeated intervals.

The test method may be adapted to guide testing for more general cases where strain or temperature may vary according to application specific histories. Data analysis may not follow this test method in such cases. See 7. Centers permissible. In typically ductile materials diameters less than 2d are often employed and in typically brittle materials diameters greater than 2d may be found desirable.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

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ASTM E606 – Strain-Controlled Fatigue Testing

Fenrigor Please confirm that you agree with our privacy and cookies policy to submit this form. No restrictions are placed on environmental factors such as temperature, pressure, humidity, medium, and others, provided they are controlled throughout the test, do not cause loss of or change in dimension with time, and are detailed in the data report. When testing for strain-controlled fatigue, it can be noted that it is influenced by the same variables e influence force-controlled fatigue. Note 1—The term inelastic is used herein to refer to all nonelastic strains. Consider taking a look at our wide variety of grips, extensometers and furnaces as well. In particular, cyclic total strain should be measured and cyclic plastic strain should be determined.

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ASTM E606 Strain-Controlled High and Low Cycle Fatigue Testing

ASTM E is intended as a guide for fatigue testing performed at low and high cycles. Results can support such activities as materials research and development, mechanical design, process and quality control, product performance, and failure analysis. While this practice is intended primarily for strain controlled fatigue testing, some sections may provide useful information for force-controlled or stress-controlled testing. No restrictions are placed on environmental factors such as pressure, temperature, medium, humidity and others, provided they are controlled throughout the test, do not cause loss of or change in dimension with time, and are explained in the final report. When testing for strain-controlled fatigue, it can be noted that it is influenced by the same variables that influence force-controlled fatigue. Strain-controlled fatigue testing has distinctive requirements on testing methods. In particular, cyclic total strain should be measured and cyclic plastic strain should be determined.

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More E The nature of strain-controlled fatigue imposes distinctive requirements on fatigue testing methods. In particular, cyclic total strain should be measured and cyclic plastic strain should be determined. Furthermore, either of these strains typically is used to establish cyclic limits; total strain usually is controlled throughout the cycle. The uniqueness of this test method and the results it yields are the determination of cyclic stresses and strains at any time during the tests. Differences in strain histories other than constant-amplitude alter fatigue life as compared with the constant amplitude results for example, periodic overstrains and block or spectrum histories.

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