Mechanical Engineering Faculty Research

Title

Notch Size Effects in HCF Behavior of Ti–6Al–4V

Document Type

Article

Publication Date

Summer 8-1999

Abstract

The high cycle fatigue (HCF) behavior of Ti–6Al–4V is investigated for cylindrical specimens having three sizes of geometrically similar circumferential V-notches, each with an elastic stress concentration factor, Kt, of approximately 2.78. A step loading technique for obtaining a point on a constant life (106 cycles) Haigh diagram from a single test specimen was implemented. Tests were performed at stress ratios of R=0.1, 0.5, and 0.8 for specimens machined from two different product forms of Ti–6Al–4V, bar and plate forgings. Results indicate that while there is a definite notch size effect in the Ti–6Al–4V bar within the range of notch sizes tested, little or no such effect exists in the plate.

Publication Title

International Journal of Fatigue

Volume

21

Issue

7

First Page

643

Last Page

652