Evaluation of da/dN vs AK CURVES AND FATIGUE THRESHOLD VALUES (AKth) OF API-X65 STEEL FOR PIPELINES

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dc.contributor	Castrodeza, Enrique Mariano
dc.contributor.author	Marouan Lmtiui, Daoud
dc.date	2016-07
dc.identifier.uri	http://hdl.handle.net/2117/106898
dc.language.iso	eng
dc.publisher	Universitat Politècnica de Catalunya
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.title	Evaluation of da/dN vs AK CURVES AND FATIGUE THRESHOLD VALUES (AKth) OF API-X65 STEEL FOR PIPELINES
dc.type	info:eu-repo/semantics/masterThesis
dc.description.abstract	The present work addresses the experimental evaluation of fatigue properties of APIX65 steel. Specifically, da/dN vs ΔK curves and fatigue threshold values (ΔKth) are discussed. Using C(T) specimens, Fatigue Crack Growth (FCG) tests were performed at R = 0.1 and R = 0.7 in air and at room temperature, according to E467 ASTM Standard. Data from these tests are then treated and analyzed. For all specimens, da/dN vs ΔK curves are plotted and discussed. MATLAB routines are developed to calculate the da/dN rates using raw data of the FCG test machine (MTS Flex Test 40). Paris Law coefficients are obtained and compared to literature values of similar API steels. A fatigue threshold value was obtained at R = 0.7. The influence of load ratio (R) is also analyzed. Finally, a comparison and discussion of all the results obtained in this work is done with values found on other studies.

Marouan Lmtiui, Daoud; Dabdoub, Michel; Iafrate, Clément; Kilian, Iris; Lisboa Figueiredo, João Henrique; Sattler, Hugo

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