Abstract
The aim of this paper is to develop a linear kinematic elastoplastic model for simulating the mechanical behavior of a heat-affected zone under low-cycle fatigue for welded S355J2 low-carbon steel. First, an experimental procedure is developed by means of a Gleeble machine for creating macroscopic tensile specimens with different homogeneous metallurgical compositions according to a welding continuous cooling transformation diagram. Then, cyclic tensile tests are carried out by prescribing different strain amplitudes up to 1%. By considering the stabilized behavior at mid-life, the yield stress and hardening modulus are identified as functions of the metallurgical composition by means of a linear mixture rule. Comparisons with numerical simulations are presented to show the efficiency of the multi-phase cyclic linear kinematic elastoplastic model proposed in this work.
Highlights
The welding process is an assembling technique extensively used in many domains such as the naval industry, nuclear engineering, and the oil industry since the early twentieth century
The aim of this paper is to develop a linear kinematic elastoplastic model to simulate the mechanical behavior of an heat-affected zone (HAZ) under low-cycle fatigue for welded S355J2 low-carbon steel
In the first part of this paper, an experimental procedure is developed by means of a Gleeble machine so as to create macroscopic tensile specimens having a controlled metallurgical phase composition according to a welding continuous cooling transformation (CCT) diagram
Summary
The welding process is an assembling technique extensively used in many domains such as the naval industry, nuclear engineering, and the oil industry since the early twentieth century. Thermal–mechanical simulators can be used to simulate the HAZ of a welded joint The advantage of these devices is the regulation of the heating and cooling rates by means of thermocouples placed on the specimens studied. This technique allows simulating a specific microstructure as described by Kim et al [7], who obtained a coarse-grained HAZ and a finegrained HAZ for welded HSB800 steel. Shao et al [10] investigated the influence of the continuous cooling rate on the mechanical and microstructural behavior of Ti–22Al–Nb. Liu et al [11] carried out Gleeble simulations by means of temperatures determined by a high-temperature infrared thermometer during a tungsten inert gas welding operation. They are used to monitor the homogeneity of thermal treatment along the longitudinal axis
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