Abstract
Material's toughness become more significant material mechanical property, as well as design variable, with recent advances of fracture mechanics understanding. Also, toughness is particularly important parameter for novel structural materials such as high-strength steels. Furthermore, due to the fact that high-strength steels are mainly used in various welded structures, evaluation of welded joint mismatched properties, including toughness, become particularly important. Therefore, the following paper presents investigation results of impact and quasi-static toughness distribution and mismatch on high-strength steels welds. Welded joint’s characteristic heterogeneous zones are obtained by mean of real welding and welding simulation. Finally, relation terms between various mechanical properties, including toughness, for further simplified engineering prediction are provided.
Highlights
Benefits of high-strength steels, HSS, are well known
Development of novel structural integrity assessment procedures based on fracture mechanics, such as the international FITNET procedure [5], a more reliable and confident assessment is possible for various types of structures
The impact toughness testing were done in acc. to EN 10045-1 [16], while EPFM parameter testing was done in acc. to ASTM E1820 [9] and BS 7448-2 [10]
Summary
To meet the necessary design and exploitation requirements for various steel structures, a number of factors must be considered wheb selecting HSS These factors should include at least a reduced deformability, weldability and demanding toughness. From the point of fracture mechanics and structural assessment procedures [5] to [10], a higher confidence and less conservatism may be achieved if material resistance properties, as well as applied stress condition are better known. Another problem arises: Can sophisticated experimental evaluation of various fracture mechanics parameters, as well as stress state be performed? Another problem arises: Can sophisticated experimental evaluation of various fracture mechanics parameters, as well as stress state be performed? from the point of the fracture mechanics parameters evaluation, novel assessment procedures
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