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Fatigue Analysis of Threaded Components with Cd and Zn-Ni Anticorrosive Coatings

Fatigue and Aeronautical Materials Research Group, Department of Materials and Technology, School of Engineering, Sao Paulo State University (UNESP), Guaratingueta 12516-410, SP, Brazil
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Academic Editor: Roberto Citarella
Metals 2021, 11(9), 1455; https://doi.org/10.3390/met11091455
Received: 24 April 2021 / Revised: 14 June 2021 / Accepted: 24 June 2021 / Published: 15 September 2021
The influence of the electrodeposition of cadmium and zinc-nickel and the stress concentration effect on the fatigue behavior of AISI 4140 steel threaded components were studied. Axial fatigue tests at room temperature with a stress ratio of R = 0.1 were performed using standard and threaded specimens with and without nut interface under base material, cadmium, and zinc-nickel-coated conditions. Finite element analysis (FEA) was used, considering both elastic and elastoplastic models, to quantify the stress distribution and strain for threaded specimens with and without a nut interface. The numeric results were correlated to the experimental fatigue data of threaded components with and without the nut interface, to allow the oil & gas companies to extrapolate the results for different thread dimensions, since the experimental tests are not feasible to be performed for all thread interfaces. Scanning electron microscopy (SEM) was used to analyze the fracture surfaces. The stress concentration factor had a greater influence on the fatigue performance of threaded components than the effect of the Cd and Zn-Ni coatings. The fatigue life of studs reduced by about 58% with the nut/stud interface, compared to threaded components without nuts. The elastoplastic FEA results showed that studs with a stud/nut interface had higher stress values than the threaded specimens without a nut interface. The FEA results showed that the cracks nucleated at the regions with higher strain, absorbed energy, and stress concentration. The substitution of Cd for a Zn-Ni coating was feasible regarding the fatigue strength for threaded and smooth components. View Full-Text
Keywords: fatigue; AISI 4140 steel; finite element method; stud; FEA fatigue; AISI 4140 steel; finite element method; stud; FEA
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MDPI and ACS Style

Marcelino dos Santos, J.R.; Fernandes, M.F.; Velloso, V.M.d.O.; Voorwald, H.J.C. Fatigue Analysis of Threaded Components with Cd and Zn-Ni Anticorrosive Coatings. Metals 2021, 11, 1455. https://doi.org/10.3390/met11091455

AMA Style

Marcelino dos Santos JR, Fernandes MF, Velloso VMdO, Voorwald HJC. Fatigue Analysis of Threaded Components with Cd and Zn-Ni Anticorrosive Coatings. Metals. 2021; 11(9):1455. https://doi.org/10.3390/met11091455

Chicago/Turabian Style

Marcelino dos Santos, Jefferson R., Martin F. Fernandes, Verônica M.d.O. Velloso, and Herman J.C. Voorwald 2021. "Fatigue Analysis of Threaded Components with Cd and Zn-Ni Anticorrosive Coatings" Metals 11, no. 9: 1455. https://doi.org/10.3390/met11091455

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