Abstract
The characterization of ductile damage evolution, and its description, have been the object of extensive research in the continuum damage mechanic field. Many different models have been developed since the pioneering works carried out a few decades ago. In detail, the stress triaxiality and the Lode angle parameters have been identified as the two main variables that affect the material ductility. The literature offers a great number of investigations under monotonic loading conditions, however, a proper characterization of the damage evolution under cyclic loading or non-proportional loading is still missing. In this paper, an unconventional coupled elastoplastic and damage constitutive model with a Mohr-Coulomb failure criterion is presented. The novelty of this study is represented by the modification of the ductile damage law in order to consider the damage evolution under non-proportional loading conditions. Therefore, the idea is to investigate the structural response of a steel bridge column subjected to a cyclic non-proportional loading, showing how, a different approach in the description of the ductile damage evolution, is necessary for a realistic description of the pier behavior.
Highlights
I n the recent years, many authors tried to characterize the ductile behavior of metals by means of different types of numerical models
The present paper aims to investigate the influence of the loading path on the ductile damage evolution
The present paper introduced a coupled elastoplastic and damage model for the evaluation of a thin wall steel bridge subjected to unidirectional and bidirectional non-proportional loading
Summary
I n the recent years, many authors tried to characterize the ductile behavior of metals by means of different types of numerical models (coupled elastoplastic and damage models, uncoupled models, phenomenological, etc.). The fundamental concept of this paper is the inclusion of an additional inelastic stretching, the tangential plastic strain, to the ductile damage evolution law in order to explain the different failure mechanism under non-proportional loading paths. The choice of an unconventional plasticity model [17] is mainly due to the ability of the SS theory to give a realistic description of the plastic strain accumulation and of the material ratcheting for cyclic mobility problems and for fatigue life investigations This approach has been used successfully in different numerical analyses focused on predicting low- and high- cycle fatigue life [18,19], assessing welded structures [20, 21], and generally for analyzing the deformation behavior of metallic [22, 23] and granular [24,25,26] materials. Their expressions are reported in the following Eqs. (5)-(7), respectively
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
