Probabilistic fatigue crack growth assessment of Al 7075-T6 aerospace component

The fatigue crack growth threshold ΔKth is an important characteristic of crack growth assessment for the integrity of structural components. However, the accurate threshold ΔKth values for austenitic stainless steels in air environment are lacking in many fitness-for-service (FFS) codes, although fatigue crack growth tests have been performed and many test data had been published. This paper focuses on fatigue crack growth threshold ΔKth values for austentic stainless steel in air environment. The paper introduces the current ΔKth values provided by four major FFS codes and summarizes the available test data based on the literature survey. The paper then discusses the applicability of the existing ΔKth for stainless steels and proposes a new relation as a function of the stress ratio (the R ratio) for use by FFS codes.

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Fatigue crack growth assessment using BS 7910:2013 - Background and recommended developments

International Journal of Pressure Vessels and Piping ◽

10.1016/j.ijpvp.2018.09.002 ◽

2018 ◽

Vol 168 ◽

pp. 79-86 ◽

Cited By ~ 1

Author(s):

Yan-Hui Zhang ◽

Matthew Doré

Keyword(s):

Fatigue Crack ◽

Fatigue Crack Growth ◽

Crack Growth ◽

Growth Assessment

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Fatigue Crack Growth Assessment of Corroded Aluminum Alloys

Engineering Against Fracture ◽

10.1007/978-1-4020-9402-6_17 ◽

2009 ◽

pp. 205-214

Author(s):

Alexis Th. Kermanidis ◽

Spiros G. Pantelakis

Keyword(s):

Fatigue Crack ◽

Aluminum Alloys ◽

Fatigue Crack Growth ◽

Crack Growth ◽

Growth Assessment

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Effect of Heat Treatment and Cryotreatment on the Fatigue Crack Growth in Aluminium 7075 Alloy

International Journal of Vehicle Structures and Systems ◽

10.4273/ijvss.12.4.21 ◽

2020 ◽

Vol 12 (4) ◽

Author(s):

P.C. Arunakumara ◽

D. Venkatesh ◽

K.R. Phaneesh

Keyword(s):

Heat Treatment ◽

Fatigue Crack ◽

Fatigue Crack Growth ◽

Crack Growth ◽

Structural Changes ◽

Cryogenic Treatment ◽

Vital Role ◽

Fatigue Load ◽

Al 7075 ◽

7075 Alloy

Al 7075 is an aluminium alloy with zinc as major element. Al 7075 is commonly used in aircraft components, especially for critical parts like wing and fuselage components. In present investigation Al 7075 has been selected subjected to annealing, cryogenic treatment and the combination of annealing and cryogenic treatment for the study of fatigue crack growth subjected to fatigue load at constant amplitude. Specimens were subjected to fatigue crack growth as per ASTM E-647 standards and the results of fatigue crack growth were compared. NASGRO software was used to predict the fatigue crack growth (FCG) and the results are validated using experimental results. Microstructure analysis of metallic specimens was also carried out to study the micro structural changes in specimens undergoing heat treatment and cryotreatment. From the present investigation it has been observed that cryogenic treatment and heat treatments plays vital role in improving fatigue life of Al 7075 components.

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