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Methodology of Residual Stress Measurements for Rivet Joints

Kaniowski J., Korzeniowski B., Hakanen M.

Fatigue of Aircraft Structures

2011

Iss. 3

42--52

The methods and good practice in XRD measurements are presented in this paper. The paper concerns the specimens made of 2024-T3 aluminium alloy plates joint together by rivets. The presented methodology can by divided into two parts: (1) general rules of XRD measurements on 2024-T3 aluminium alloy - choosing the diffraction angle, time of exposure on X-ray radiation, diameter of X-ray spot, etc. and (2) rules applied to riveted specimens - geometrical analysis of the specimen and movements of the goniometer which allow to obtain proper results of stress measurement. Short information about theoretical bases and influence of protective layers on XRD measurement is also included. In the end of the paper the additional equipment called the slit is presented, which allow to perform measurements on flat and cylindrical surfaces with higher resolution.

The radiochemistry cyclotron in University of Helsinki

Helariutta K., Hakanen M., Solin O.

Nukleonika

2003

Vol. 48,suppl.2

173-174

The 10 MeV proton cyclotron in the Laboratory of Radiochemistry, University of Helsinki is presented. Recent activities as well as the future research and teaching directions around the cyclotron are discussed.