Steels fatigue behavior

In the case of the fibrous laminate not much work has been done, but it has been observed that a significant loss of stiffness in boron—aluminum laminate occurs when cycled in tension—tension (43,44). Also, in a manner similar to that in the laminated PMCs, the ply stacking sequence affects the fatigue behavior. For example, 90° surface pHes in a 90°/0° sequence develop damage more rapidly than 0° pHes. In the case of laminates made out of metallic sheets, eg, stainless steel and aluminum, further enhanced resistance against fatigue crack propagation than either one of the components in isolation has been observed (45). 

Sustained SCC measurements on the 4340M steel in distilled water established that KISCC =13 MN/m3/2. The effect of this environment on the corrosion fatigue behavior for this steel for frequencies from 10-3 to 4 Hz is included in Fig. 7.121. Examination of the data leads to the following observations ... 

Figure 7.123 shows the corrosion-fatigue behavior of the line pipe steel in the 3.5% NaCl solution at the corrosion potential, -440 30 mV (SHE) compared with -800 10 mV (SHE) when cathodically coupled (Ref 169). At the higher free-corrosion potential, the slope of re-... 

Studies of the fatigue behavior of vapor-deposited pyrolitic carbon fibers (4000 to 5000 A thick) onto a stainless steel substrate showed that the film does not break unless the substrate undergoes plastic deformation at 1.3 x 10 strain and up to one million cycles of loading. Therefore, the fatigue is closely related to the substrate, as shown in Figure 39.17. Similar substrate-carbon adherence is the basis for the pyrolitic carbon deposited polymer arterial grafts [Park and Lakes, 1992). 

Figure 8.18. Effect of dissolved oxygen concentration in 3%NaCI, 25°C, on fatigue behavior of 0.18% C steel [81], (Reprinted with permission of ASM International All rights reserved.

S. Steel, L. P. Zawada, and S. Mall, Fatigue Behavior of Nextel 720/Alumina (N720/A) Composite at Room and Elevated temperatures, Ceram Eng. Sci. Proc. 12,695-702 (2001). 

Then the hybrid interference and some design aspects for practical application in (the antomotive steel wheel) have been analyzed. An experimental evaluation of the contributions of the adhesive and the interference to the resultant resistance of the hybrid joint was carried out with particular attention to the phenomena occurring at the interface level and the effect of the adhesive nature, its curing technology and its mechanical response. The outcomes of the laboratory analyses were validated in the steel wheel system. The adhesive contribution mainly affects the static resistance of the hybrid joint, and is strongly related to the type of adhesive exploited. On the other hand, the interference seems to play an important role in the fatigue behavior, especially in the wheel system. 

Wheeler, K. R. and James, L, A., "Fatigue Behavior of Type 316 Stainless Steel under Simulated Body Conditions," Journal of Biomedical Materials Research, Vol. 5, 1971, pp. 267-281. 

Well-documented studies have been performed to compare the fatigue behavior in air and under vacuum at low or moderate temperature of copper (Wang et al., 1984 Bayerlein and Mughrabi, 1992) and austenitic stainless steels (Gerland et al., 1988 Mendez et al., 1993). As an example. Fig. 5-12 shows the marked effect of an air environment at room temperature, even for a corrosion-resistant alloy. High cumulative plastic strain amplitudes can be reached under vacuum. The oxygen partial pressure controls the nature of the surface oxide and localization of the crack initiation process in persistent slip bands formed by cyclic straining. 

Moreover, the effect of coatings on the fatigue behavior of a 316L austenitic stainless steel is clearly emphasized in Fig. 5-13, as well as the effect of the thickness of the amorphous, deposited NiTi film on the specimen surface (Mendez et al., 1993). The... 

Figure 5-24. Effect of sulfur content on the corrosion fatigue behavior of a low alloy steel in high temperature water (290 °C) (Atnzallag et al., 1984).

Ste76] Steele, R.K. and McEvily, AJ., The High-Cycle Fatigue Behavior of Ti-6A1-4V AUoy, Eng. Fract. Mech., Vol 8, 1976, p. 31-37... 

Amzallag, C., P. Rabbe, and A. Desestret (1978). Corrosion fatigue behavior of some special stainless steels. Corrosion Fatigue Technology, ASTM STP 642, pp. 117-132. Baumeister, T., E. A. Avallone, and T. Baumeister HI, eds. (1978). Mark s Standard Handbook for Mechanical Engineers, 8th ed., McGraw-Hill, New York. 

Recent progresses concerning long-term creep and fatigue behavior of austenitic stainless steels... 

Some recent developments concern very high-cycle fatigue behavior of austenitic stainless steels, up to 600°C [114]. As in-service conditions correspond to low strain amplitudes, experimental data are required for designing components. One of the main problems concerns the possible existence of the fatigue limit. 

Fatigue behavior is the most critical for anchor groups having anchors installed through holes in a steel plate or other fixture, since there is significant potential for unequal shear load distribution. Where fatigue due to shear is determined to be important, it is advisable to eliminate movement in the connection via welded thickened washers or supplemental grouting of the annular gap. 

De Kazinczy, F. Fatigue behavior of cast steel contaning defects. Jemkont. Annlr. 150,493 (1966)... 

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