Cyclic strength

An original and simple method of express estimate of the protective ability of inhibited coatings is described in [83]. The cyclic strength of steel wire samples coated by inhibited polyethylene is estimated upon exposition for two to 12 days in a hostile medium (0.2 n aqua solution of sulfuric acid). The index of cyclic strength is taken as the number of bends in opposite directions through 90 degrees preceding failure of the sample. 

The cyclic strength of unprotected samples drops abruptly in the harsh medium (curve 1). The number of loading cycles preceding failure of the samples with PE coatings (curve 2) reduces by not more than 35%. The samples with inhibited coatings turned out to be even less well protected (curves 3-5). They are characterized by three sections on curve N t). 

Compilation summary of cyclic strength of clays, pure stress reversal. (From Chaney, R.C., and Fang, I-LY., Static and dynamic properties of marine sediments. Proceedings of the Symposium on Marine Geotechnology and Nearshore/Offshore Structures, Shanghai, China, ASTM STP 923, pp. 74-111, 1986. Reprinted with permission. Copyright ASTM.)... 

Typical cyclic strength contours for specific / strain level at two f different number of cycles... 

Change in pore pressure per load cycle as a function of degree of saturation. (From Chaney, R.C., Saturation effects on the cyclic strengths of sand. Proceedings of the Speciality Conference on Earthquake Engineering and Soil Dynamics, ASCE, Pasadena, CA, 1, pp. 342-358,1978. Reprinted with permission of ASCE.)... 

Slightly sloping buff with increased slope at shoreline. Sand (D50 22 0.1) and gravel to 20 ft followed by Bootlegger clay having sand lenses up to 3 ft in thickness. Water table between 10 and 20 ft. Cyclic strength testing performed on undisturbed days and remolded sands... 

Ishihara, K. and Yasuda, S. 1980. Cyclic strengths of undisturbed cohesive soils of western Tokyo, International Symposium on Soils Under Cyclic and Transient Loading, Swansea, A.A. Balkema, Rotterdam, the Netherlands, pp. 57-66. 

Praeger, S.R., and Lee, K.L. 1978. Post-cyclic strength of marine limestone soils. In Earthquake Engineering and Soil Dynamics 1, ASCE Press, New York, 732-745. 

Corrosion of most common engineering materials at near-ambient temperatures occurs in aqueous (water-containing) environments and is electrochemical in nature. The aqueous environment is also referred to as the electrolyte, and, in the case of underground corrosion, it is moist soil. Corrosion is a common form of structure degradation that reduces both the static and cyclic strength of a pipeline. There is always the chance that pipelines could leak or rupture, and a pipeline failure can cause serious human, environmental, and financial losses [3-5]. 

Koester, J. P. (1994). The influence of fines t) e and conent on cyclic strength. In Proceedings of the ASCE Conv., Atlanta. Geotech. Spec. Pub. 44, 17-32. 

Thevanayagam, S., Fiorillo, M., Liang, J. (2000). Effect of non-plastic fines on undrained cyclic strength of silty sands. In R.Y.S. Pak J. Yamamura (Eds.), ASCE Geotech Spec. Publ. 107, (pp. 77-91). 

The result of investigations up to 10 load cycles show that for glass fiber reinforced plastics, the ductile matrix systems EP2 and EP3 are superior to iaminates with the brittle EPl system. Eor glass fiber reinforced piastics, Pig. 4.94, ieft shows the comparison between static strength and the cyclic strengths measured in singie-step tests. 

Figure 4.94 Comparison of static and cyclic strength values for GFP and CFP (fiber content ...

Alarcon-Guzman A, Leonards GA, Chameau JL (1988) Undrained monotonic and cyclic strength of sands. J Geotech Eng ASCE 114(10) 1089-1109 Baziar MH, Dobry R (1995) Residual strength and large-deformation potential of loose silty sands. J Geotech Eng ASCE 121(12) 896-906 Been K, Jefferies MG (1985) A state parameter for sands. Geotechnique 35(2) 99-l 12... 

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