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Local strain analysis in friction stir welded 2024-T3 aluminium joinsunder ciclic loading

Sołtysiak R.

Journal of Polish CIMAC

2010

Vol. 5, no 3

187-192

A geometrical notch effect and a structural notch effect have the main influence on the local stress and strain concentration in the welded joints. The value of this local stress and strain affects the fatigue life of the whole structural component. In order to mark this value using numerical or analytical methods, the local material properties from the individual zones need to be known. Friction stir welding (FSW) is a relatively new joining method derived from conventional friction welding. This method of joining materials is finding a wider interest in the various industry fields, and the properties of these joints are the object of ongoing research. In this paper, heterogeneous local strain distributions from the individual zones of a friction stir-welded sample of 2024T3 aluminum alloy are reported. Selected results of strain analysis in the form of hysteresis loops and diagrams of the plastic strain amplitude for particular joint zones for subsequent cycles are presented. The test was carried out undergradually increasing (Lo-Hi) sinusoidal cyclic loading with the stress ratio R = -1. Seven strain gauges with 0,6 mm gauge length were used to local strain measurement.