By Howard E. Boyer
Includes greater than 500 fatigue curves for business ferrous and nonferrous alloys. additionally encompasses a thorough clarification of fatigue trying out and interpretation of try effects. every one curve is gifted independently and comprises an evidence of its specific value. The curves are titled by way of commonplace commercial designations (AISI, CDA, AA, etc.) of the metals, and a whole reference is given to the unique resource to facilitate additional learn. the gathering contains ordinary S-N curves, curves exhibiting impact of floor hardening on fatigue energy, crack growth-rate curves, curves evaluating the fatigue strengths of assorted alloys, influence of variables (i.e. temperature, humidity, frequency, getting older, atmosphere, etc.) and lots more and plenty, even more. This one quantity consolidates vital and hard-to-find fatigue information in one complete resource.
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Additional info for Atlas of Fatigue Curves
R-(REPEATEO- TEtlSION) o I I I 2 4 G ~ 8 10 \2. \ONS- MILLIONS The term "fatigue" refers to the failure of metals from repetitions of stress rather than from a single application, as occurs for example in a simple tensile test or with a brittle failure. The value of the stress necessary to cause failure of a material from fatigue is lower than its nominal tensile strength. i. when subjected to a single application ofload as in an ordinary tensile test. i. is applied repeatedly to the same material, failure will not take place until this has been done a certain number of times, while at a lower stress still, the number ofload cycles required to cause failure will be even greater.
1) ~ - 10- 1 ~ s: ~ 'U One lattice -.. spacing -- 10-. II 50 ~I I"'" '" i- , 30 I I 10 ern .. 75 in air, hydrogen. and hydrogen sulfide at ambient temperature. Fig. 23 Fatigue crack propagation data over a wide spectrum of growth rates tional bending, resonance, and servomechanical systems are discussed in this article and are compared in Table 3. Other specialized electromechanical systems are available to perform specific tasks. Forced-Displacement Systems Forced-displacement motor-driven systems are the simplest type of electromechanical fatigue testers.
The mean or static load, onto which the dynamic load is superimposed, is achieved by preloading the inertia compensator spring, K. Through special fixturing, forced-vibration devices are capable of testing in tension, com- 22 Fatigue Testing pression, bending, torsion, or reverse st~ess. Although servo-controlled, mean-load-maintenance systems are available, the open-loop nature of the system prevents direct load measurement or control, which is characteristic of closed-loop systems. The load applied to the specimen is assumed to be a function of r, and a graduated scale is provided to permit reasonably accurate setup.