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Mechanical Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

2002

Worcester Polytechnic Institute

Fatigue of Ti-6Al-4V

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Full-Text Articles in Mechanical Engineering

Investigation Of Fatigue Crack Initiation In Ti-6al-4v During Tensile-Tensile Fatigue, Svetlana G. Ivanova, Ronald R. Biederman, Richard D. Sisson Jr. Apr 2002

Investigation Of Fatigue Crack Initiation In Ti-6al-4v During Tensile-Tensile Fatigue, Svetlana G. Ivanova, Ronald R. Biederman, Richard D. Sisson Jr.

Mechanical Engineering Faculty Publications

Fatigue crack initiation in Ti-6Al-4V has been investigated in high cycle fatigue (HCF) and low cycle fatigue (LCF) regimes at stress ratio R = 0.1 using the replication technique. In all four tested α/β microstructures, the crack was initiated by fracture of equiaxed alpha grain. Fractured alpha grains are seen on the fracture surface as flat facets with features characteristic of cleavage fracture. In the regime of low stress amplitudes and in the absence of reverse loading, cleavage fracture contributes to crack initiation and early stages of crack growth in Ti-6Al-4V. This mechanism is discussed in relation to the ...