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Determination of Stress Values in the Surface Layer of Inconel 718 Samples Dedicated to Fatigue Tests

Gadalińska Elżbieta, Michałowski Andrzej, Czarnewicz Sławomir

Fatigue of Aircraft Structures

2019

Iss. 11

78--86

This work deals with the problem of X-ray stress determination on the samples dedicated to fatigue tests. A number of research studies point out the fact that the processing of hard, difficult to machine materials like nickel superalloys, reveals more than one trend of residual stress versus working parameters of behaviour (Lavella and Berruti, 2010). Many papers have shown that the residual stresses are dependent on a combination of a number of factors. When the above is taken into account simultaneously with the requirements of the internal General Electric specification for the fatigue tests samples preparation (Metallic test specimen preparation, low stress, 2017) the problem of turning and grinding parameters gathers significance. It is well known that the quality of the surface layer, produced during machining, is of vital importance for the fatigue life specially for the components of aircraft produced form nickel superalloys e.g. Inconel 718 (Kortabarri et al., 2011). That is why the surface layer’s properties are described in detail by the standards. The aim of the work is to determine one of the most influential features from the point of view of fatigue life, i.e. the stress state on the surface layer with one non-destructive method - the diffraction analysis.

Krajobraz kulturowy na liście światowego dziedzictwa – polskie doświadczenia

Michałowski Andrzej

Ochrona Dziedzictwa Kulturowego

2017

Nr 4

21--30

The central organisation around which Polish cooperation with UNESCO on implementing the World Heritage Convention has been concentrated from the beginning is the Polish National Committee ICOMOS. The cooperation has been organised by institutions and people connected in some way with the Committee. Specialised institutions were gradually joining the cooperation. One example of such measures was the appointment of the Board of Historical Gardens and Palaces Conservation, transformed subsequently into the Centre for the Protection of Historic Landscape in Warsaw. A „garden” conservation society has gathered around this institution, composed of art historians, landscape architects, architects and gardeners. They have been carrying out interdisciplinary works concerning historic gardens and cultural landscapes in Poland. Their cooperation with the Polish National Committee ICOMOS and the International Committee of Historic Gardens and Sites ICOMOS – IFLA was connected with the activities of UNESCO. Major activities of the Centre include: valuation and assessment of cultural landscapes for the World Heritage List; drawing up, in collaboration with the Fürst-Pückler-Park Bad Muskau Foundation, an application for the inscription of Park Muskau in the UNESCO World Heritage List; organisation of international conference: „The Regional Expert Meeting on Cultural Landscapes in Eastern Europe” in Białystok in 1999 at the request of WHC UNESCO; organisation of international conference „Cemetery Art” in 1993 at the request of WHC UNESCO, along with accompanying exhibitions concerning specific issues, organised by the Board of Historical Gardens and Palaces Conservation in Warsaw.