Experimental investigation on mechanical behaviors of Q345B steel material over wide ranges of strain rates and temperat
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(2020) 42:537
TECHNICAL PAPER
Experimental investigation on mechanical behaviors of Q345B steel material over wide ranges of strain rates and temperatures Tao Jiang1 · Chong Ji1 · Xin Wang1 · Ying Liu1 · Changxiao Zhao1 · Yuxiang Sun1 · Kun Zhang1 Received: 20 May 2020 / Accepted: 15 September 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract In the present study, the stress–strain relationships of Q345B steel with the coupling effect of temperature and strain rate were primarily investigated. First, the quasi-static tensile test and dynamic impact compression test were performed using the 810 material test system and the split Hopkinson pressure bar device, respectively, at temperatures ranging from 25 to 700 °C and the strain rate ranging from 0.001 to 4000 s−1. Second, thermal and strain-rate effects on the mechanical behavior of Q345B steel material steel were studied. It was reported that Q345B steel can be significantly softened with temperatures and hardened with strain rates. Finally, a modified Johnson–Cook (J–C) model was developed to describe the nonlinear mechanical behavior of Q345B steel material over a wide range of strain rates and temperatures. Keywords Q345B steel · Split Hopkinson pressure bar · High temperature · High strain rate · Johnson–Cook constitutive equation
1 Introduction As a comprehensive mechanical and building material, lowalloy Q345B steel is extensively used in bridges, buildings, pressure vessels, and special equipment, among other fields. It is possible for engineering structures to be exposed to extreme dynamic loads during their service life, such as industrial explosion accidents, bomb explosions, fire, and accidental collisions [1–5]. To accurately design and evaluate the performance of engineering structures under such extreme dynamic loads, it is necessary to study the mechanical behavior of the material, especially the dynamic mechanical properties. It has been experimentally proven that the properties of materials generally differ between dynamic and static states. The dynamic mechanical properties of a material are known to be dependent on the strain, strain rate, and temperature. The split Hopkinson pressure bar (SHPB) device has become an effective experimental technique to study the dynamic Technical Editor: João Marciano Laredo dos Reis. * Chong Ji [email protected] 1
College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China
behavior of materials over a wide range of strain rates [6–9]. The specially modified SHPB system can be used to investigate material properties at different temperatures. Numerous experimental studies on the dynamic behavior of materials such as metals have been conducted by many researchers. Whittington et al. [10] investigated the mechanical response and damage evolution of RHA steel. High strain-rate experiments conducted via SHPB showed increased strength and reduced failure strains. An internal state variable (ISV) plasticity/damage model was used to capture the varyin
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