Investigation of Laser Treatment as a Method for Fatigue Crack Growth Retardation in Aluminum Alloy 2198-T851

Metals

Carlos Antonio Reis Pereira Baptista¹  Cauê Pettermann Carvalho¹  Viktor Pastoukhov¹  Milton Sergio Fernandes de Lima² 

[1] Engineering School of Lorena, University of São Paulo (EEL/USP), Lorena 12602-810, SP, Brazil;Photonics Division, Institute for Advanced Studies (IEAv/DCTA), São José dos Campos 12242-150, SP, Brazil;

关键词: laser surface treatment;    laser heating;    fatigue crack growth;    AA2198-T851;   

DOI  :  10.3390/met11122034

来源: DOAJ

【 摘 要 】

Among the third-generation Al-Li alloys, AA2198 stands out for its lower density, formability and increased stiffness, being suitable for use in aircraft fuselage sheets and other inner structures in order to reduce weight and improve performance. An important topic related to damage tolerant structures is the development of techniques to retard fatigue crack propagation, such as the localized heating by a laser source. The aim of the present work was to find the most suitable parameters for the production of laser heating lines in 2198-T851 alloy sheets in order to reduce the fatigue crack growth rate in this material. Laboratory tests using C(T) specimens under two loading conditions (R = 0.1 and 0.5) provided a useful dataset on the laser heated material. The experimental results indicate a 200 W laser beam power at treatment speeds of 1 and 10 mm/s was sufficient to retard crack growth in the current setup. The more expressive results were obtained for 200 W laser power with a speed of 1 mm/s and cyclic loading with stress ratio R = 0.1.

【 授权许可】

Unknown