A fracture mechanics life prediction methodology applied to dovetail fretting

An investigation of fretting fatigue in a circular arc dovetail assembly

“…The second source comes from high cycle fatigue (HCF) loading such as the vibrational loads induced by aerodynamic forces. Previous experimental investigations [4][5][6][7] have made great efforts to introduce both the inertial and vibrational loads into laboratory tests. However, such complex experimental fixtures may pose difficulty in relating the experimental results to the applied contact loads.…”

“…The other type of dovetail assembly experiment was developed by Conner and Nicholas [6], in which the fixture held removable contact pads rather than using a conformal contact geometry as in the Ruiz's fixture [4]. Similar fixture was designed by Golden and Calcaterra [7] to evaluate the effect of flank angle on the fretting fatigue performance of dovetail specimens. Obviously, this kind of set-up has easily replaceable fretting pads and is quite rigid, which results in very reproducible alignment.…”

Fretting fatigue tests on shrink-fit specimens and investigations into the strength enhancement induced by deep rolling

“…Examples of fretting fatigue include the dovetail interface of turbomachinery [1][2][3][4] and the shrink-fit (tubular or cylindrical) connection [5][6][7][8][9][10][11]. Fretting testing is essential in designing admissible loads and also to validate different modelling approaches.…”

“…Experimental fretting tests can be classified into: (1) full or small scale replication of the actual fretting configuration, as experienced by the in-service component, and (2) idealised test layout where the contact is accurately controlled [12,13]. Examples of component testing have been presented by Golden et al [4,14] regarding the dovetail interface, by Bertini et al [9] and Alfredsson [10] regarding shrink-fit connection, and Azevedo et al [15] regarding cable clamping, as well as others for different applications. Controlled contact fretting tests are well summarised in Hills and Nowell [12], and the usual layout is the ''bridge" type with a two sided contact pad.…”

Failure characterisation of Ti6Al4V gas turbine compressor blades

“…Methods for characterising crack initiation using asymptotic analysis were discussed, together with short crack arrest concepts which provide a means of predicting fretting fatigue limits from plain fatigue data. Golden and Calcaterra [10] evaluated a fracture mechanics based crack growth life prediction methodology for dovetail fretting fatigue laboratory experiments. They considered contact loads and bulk stress calculated from finite element method as input to the stress and life estimation analysis.…”