Author(s)

I. Černý, V. Očenášek & F. Hnilica

Abstract

An evaluation of fatigue crack growth and affecting mechanisms in Al-alloys with strongly orientated microstructure I. Černý1, V. Očenášek2 & F. Hnilica3 1Strength Department, SVÚM a.s., Praha, Czech Republic 2VÚK Panenské Břežany s.r.o., Odolena Voda, Czech Republic 3UJP Praha a.s., Czech Republic Abstract Several types of Al-alloys to be used in aircraft structures are manufactured by extrusion resulting in a strongly orientated anisotropic microstructure with a high degree of texture. To assess a reliability and safety of structures containing crack-like defects, fatigue crack growth (FCG) data and knowledge of mechanisms affecting the FCG are needed. FCG characteristics and affecting mechanisms in an aircraft Al 4114 alloy in the direction of extrusion and in the perpendicular direction were investigated at the load asymmetries R=0.1 and R=0.5, respectively. Special non-standard specimens with side notches were used to prevent cracking in inappropriate directions caused by

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