The application of a new type of alloy requires the evaluation of its properties, which is typically achieved with destructive methods. For this purpose, among others, static and fatigue mechanical tests are performed. Tests are performed on standardized samples in a way which reflects the level of stress occurring in real elements. These tests should limit random errors associated with sample preparation. For this reason the proper preparation of samples is crucial, not only in terms of their geometric dimensions but also in terms of the residual stress level. A sample preparation process was developed, involving checking samples’ surface for cracks, scratches, roughness, and the state of stress. The measurements are performed with nondestructive methods so as not to affect the proceeding research.
In this study, the residual stress and features of a mechanically prepared surface were characterized. The specimens were subjected to various surface finishes mainly, lathe turning and grinding surface conditions. The effects of residual surface stress (measured by XRD) were studied after machining and polishing.
 Gadalińska E., Kaniowski J., X-ray diffraction measurements for riveted joints. Application of the novel methodology; Fatigue of Aircraft Structures, Issue 2012, pp. 18-39.
 Elżbieta Gadalińska, Andrzej Baczmański, Micromechanical Properties and Stress Measurements with Diffraction Methods; Fatigue of Aircraft Structures, Issue 2013, pp. 17-29.
 Fatemi A. and Yang L., 1998, “Cumulative Fatigue Damage and Life Prediction Theories: a Survey of the State of The Art for Homogeneous Material”, International Journal of Fatigue, vol. 20, pp 9-34.
 N. Chawla and X. Deng, “Microstructure and Mechanical Behavior of Porous Sintered Steels”, Mater. Sci. Eng. A 390 (2005) 98-112.
 C.M. Sonsino, F. Müller and R. Mueller, “The Improvement of Fatigue Behaviour of Sintered Steels by Surface Rolling”, Int. J. Fatigue 14 (1992) 3-13.
 C.M. Sonsino, F. Müller, V. Arnhold and G. Schlieper, “Influence of Mechanical Surface Treatments on the Fatigue Properties of Sintered Steels under Constant and Variable Amplitude Loading”, Mod. Dev. Pow. Metall. 21 (1988) 55-66.
 F. Ghanem, C. Braham, M.E. Fitzpatrick, and H. Sidhom, “Effect of Near-Surface Residual Stress and Microstructure Modification from Machining on the Fatigue Endurance of a Tool Steel”, J. Mater. Eng. Perf. 11(6) 2002 631-639.
 O. Obiukwu, M. Nwafor, B. Okafor, L. Grema “The effect of surface finish on the low cycle fatigue of low and medium carbon steel, International Conference on Mechanical and Industrial Engineering (ICMIE'15) July 14-15, 2015 Harare (Zimbabwe).