Failure resistance of high-cycle loaded welded joints

Rimantas Stonkus

Doctoral dissertation

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Technological sciences, mechanical engineering (09T).

The dissertation investigates the problems of welded joints resistance to fracture, affected by high-cycle load. The object of research is mechanical state of welded joints, formed in construction elements, in which the fracture process begins because of high-cycle load. Examination of fracture mechanism is important to ensure the design and running durability of large-size elements. Detailed analysis and interpretation allows to choose better calculation methodology for welded joints. The main aim of dissertation – to investigate the process of fracture in butted welded joints, which are loaded high-cyclically, to improve calculating methodology according to consistent patterns of crack formation, propagation, stop and complete fracture, defined by experimental analytical researches. The dissertation consists of an introduction, five chapters, summary of results, references and list of author’s publications on dissertation subject. The introduction reveals the investigated problem, the topicality of the issue, the object of research, describes the aim and tasks of the paper, research methodology, scientific novelty, the practical significance of the results examined in the paper and defended propositions. The introduction ends in presenting the author’s publications on dissertation subject and reports in conferences. The first chapter covers the literature review. It reviews the research works closely related to the dissertation topic and presents the topicality and problems of high-cycle strength of welded components. The chapter ends with the conclusions and concretizes tasks of the work. In the second chapter the methods of accomplished experimental research are presented, the essence of testing methods, their application, testing performance and the methods of results processing are described. In the third chapter the analysis of the results of experimental, analytical research are presented. In this section the influence of structural and technological factors on the welded joint failure process are examined. The fourth chapter presents the results of experimental, analytical and numerical research, while the aim of research is to examine the welded specimens, prepared according to real construction’s engineering technology and resistance to programmable loading. In the fifth chapter, based on research results, the improved calculation methodology for welded structural elements is proposed.

7 articles focusing on the subject of the discussed dissertation are published: three articles – in the Thomson ISI Web of Science list, four articles – in international conference material (three of them included in the ISI Proceedings list). 3 presentations on the subject were made at the conferences in Lithuania and other countries.

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160×230 mm
124 p.
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