Performance characterization of high-strength steel and quenched and tempered steels and their joints for structural app
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RESEARCH PAPER
Performance characterization of high-strength steel and quenched and tempered steels and their joints for structural applications Martina Aguiari 1
&
Marco Palombo 2 & Cesare Mario Rizzo 1
Received: 12 February 2020 / Accepted: 14 October 2020 # The Author(s) 2020
Abstract Although in the last decades the applicable regulations for the design of steel structures have been deeply improved accounting for modern design approaches and technologies, in a few industrial fields, concepts and formulations derived from centuries-old experience are even nowadays the governing rule. This very often limits the potential offered by the technological innovations in high-performance material, such as quenched and tempered (QT) steels. After having verified in the scientific literature, in the commercial one and in several open material databases that some main data necessary to the comprehensive characterization of QT steel used in building large metal structures are lacking, an extensive experimental campaign was undertaken to achieve an updated and specific fatigue strength characterization for certain types of materials. The aim is to overcome the strict requirements of current regulations on the application of both parent QT materials and welded homogeneous and heterogeneous joints between different steel strength. The experimental campaign allowed filling the knowledge gap as well as providing further understanding whether the use of high-strength steel is effective in the improvement of performances of large steel structures, whose fabrication procedures are typical of building sites rather than workshops. Their extensive application in current building practice is expected to be highly beneficial in terms of weight and costs. Keywords QT steel . High strength . Low alloy steel . Characterization . Fatigue strength . Experimental tests
1 Introduction and motivation of work The use of high-strength steel (HSS) is becoming more and more common since these materials allow lighter, slender and simpler structural designs. In general, the use of HSS contributes to weight reduction, which compensates their higher cost [1]. Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures * Martina Aguiari [email protected] Marco Palombo [email protected] Cesare Mario Rizzo [email protected] 1
University of Genova, Polytechnic School, DITEN, via Montallegro, 1, 16145 Genoa, Italy
2
Italian Institute of Welding, Lungobisagno Istria, 15, 16141 Genoa, Italy
The use of HSS, coupled with advanced production technologies, has high potential for weight reduction in welded structures. However, due to the lack of knowledge about fatigue strength and behaviour under dynamic loading more in general, the current rules of regulatory bodies, such as the classification societies in the shipbuilding field or Eurocode for large civil constructions, do not yet allow to take advantage of the full potential of HSS in the design of lighter steel structures [2]. Basically, steel struc
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