Premium
Prediction of ultimate resistance by application of damage theory with special regard to HSS
Author(s) -
Schaffrath Simon,
Feldmann Markus
Publication year - 2019
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.1128
Subject(s) - extrapolation , ductility (earth science) , toughness , structural engineering , welding , yield (engineering) , finite element method , plasticity , tension (geology) , ultimate tensile strength , computer science , materials science , engineering , mathematics , composite material , creep , mathematical analysis
It is a general question as to whether the established rules for predicting ultimate resistance under global tension can also be applied to structures made from HSS, i.e. up to = 960 MPa. Apart from the welding issue, for the base material, this question refers to several items, e.g. the plastic flow curve, the yield stress level, the yield ratio, the upper‐shelf ductility and strainability and the lower‐shelf toughness. It reveals that predicting the ductile fracture of steel components can only be an approximation, and neither allows for a deeper understanding of the real ductile crack development up to ultimate load nor leads to a realistic extrapolation if high‐strength steels are used. The research work presented therefore suggests an innovative extension of the FEM analysis by implementing appropriate damage mechanics based failure criteria. After an introduction to the principles of this methodology, possibilities for its use in structural steel research and design as well as further insights into the structural behaviour of steel components, especially HSS up to S960, are presented – insights that are not possible by traditional testing or simulation.