Aspects of structural degradation in old bridge steels by means of fatigue crack propagation

• Дата: 2011
• Автори: Lesiuk, G., Szata, M.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-механічний інститут ім. Г.В. Карпенка НАН України 2011
• Назва видання: Фізико-хімічна механіка матеріалів
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/138127
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Aspects of structural degradation in old bridge steels by means of fatigue crack propagation / G. Lesiuk, M. Szata // Фізико-хімічна механіка матеріалів. — 2011. — Т. 47, № 1. — С. 76-81. — Бібліогр.: 11 назв. — англ.

The paper presents conclusions drawn from studies related to old steel structures, especially those erected on the turn of the 19th century. The objects of interest of the authors were Wroclaw Pomorskie Bridges: the Central Pomorski Bridge and the North Pomorski Bridge (1885, 1930 respectively), as well as the Sand Bridge (1861). The material used for their construction was puddled steel or cast steel. In the course of long operation the steels (especially the puddled one) show susceptibility to degradation processes. In this paper the results of metallographic tests (light microscopy, SEM) and mechanical properties tests (hardness measurement, static tensile test) presenting the state of structural degradation have been presented. Also, the initial study results for the puddled steel coming from the Sand Bridge and concerning development of a fatigue crack have been presented. Basic quantities describing the kinetics of fatigue crack growth have been determined.