Discerning the Fatigue Crack Growth Behavior of API X65 Steels Under Sequence Loading
| Autor: | N. I. I. Mansor, Ahmad Kamal Ariffin, Shahrum Abdullah |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
constant amplitude loading
Materials science Stress ratio Aerospace Engineering Ocean Engineering 02 engineering and technology sequence loading Fatigue crack growth Crack closure 0203 mechanical engineering Residual stress General Materials Science Civil and Structural Engineering Load ratio Sequence (medicine) lcsh:QC120-168.85 business.industry Mechanical Engineering Structural engineering Paris' law 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports Retardation effect API X65 steel Mechanics of Materials Automotive Engineering Length of service lcsh:Descriptive and experimental mechanics 0210 nano-technology business lcsh:Mechanics of engineering. Applied mechanics lcsh:TA349-359 |
| Zdroj: | Latin American Journal of Solids and Structures, Vol 14, Iss 2, Pp 202-216 Latin American Journal of Solids and Structures, Volume: 14, Issue: 2, Pages: 202-216, Published: FEB 2017 Latin American Journal of Solids and Structures v.14 n.2 2017 Latin American journal of solids and structures Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM) instacron:ABCM |
| ISSN: | 1679-7825 |
| Popis: | This paper presents the effect of sequence loading on fatigue crack growth of API X65 steel tested in room temperature. Most of pipeline steels are subjected to wide spectrum of loading during the length of service. Influence of load history effect can cause a trickier assessment to the fatigue behaviour. The objective of this study is to determine the fatigue crack growth behaviour under sequence loading. The material used in this study is X65 steel grade, broadly used in transporting the oil and gas. The constant amplitude loading under mode-I loading and stress ratio of 0.1 and 0.7 are investigate. The effects of sequence load are presents by the two-level block loading. The retardation effect is more intense for block sequence loading. At least about 9.7x104 delayed numbers of cycles was observed which is two times longer compared to constant amplitude loading. The load sequence was suggested affected by retardation consequently delayed the crack growth. It was further observed an increase of overload load ratio consequently resulted a crack grows faster about 18%. It was concluded a lengthy in crack growth was associated with the delay cycles suggesting that the fatigue life depends mainly on size of delay zone and compressive residual stress near the crack tip. |
| Databáze: | OpenAIRE |
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