Mechanical properties of Q345 structural steel after artificial cooling from elevated temperatures

Zhang, Chuntao; Wang, Ruheng; Zhu, Li

doi:10.1016/j.jcsr.2020.106432

Cited by 34 publications

(11 citation statements)

References 27 publications

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“…The base supported the entire mechanism and maintained its stability. Q345 steel was used for construction of the base [26,27]. The density of Q345 steel was 7.86 g/cm 3 , the elastic modulus was 209 GPa, the Poisson's ratio was 0.29, and the tensile strength and the yield strength were 620 MPa and 345 MPa, respectively [28,29].…”

Section: Static Analysismentioning

confidence: 99%

Design and Simulation of Small-Scale Waste Separation and Sorting Equipment

Zhang

2022

Processes

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Environmental pollution is currently a major concern globally owing to increase in the world population and advances in industrialization. An automatic waste separation and sorting equipment for small-scale waste sorting systems was constructed in this paper. A two-DoF (two-degree-of-freedom) parallel sorting mechanism as well as a belt waste separation and feeding mechanism were designed, and 3D models of the mechanism were established. Finite element analysis (FEA) was conducted for the sorting mechanism, and kinematic and dynamic analysis and numerical simulation were performed for the waste and sorting mechanism. The simulation results demonstrated that the spherical waste did not roll out of the platform after leaving the slideway. The waste was stabilized at the center of the platform within a short duration with movement of the collecting mechanism of the platform. The system was optimized to reduce waste separation and sorting time. Stability of the waste motion in the equipment as well as efficiency of the system were significantly improved after optimization. The results showed that the designed equipment can complete separation and sorting of waste materials at lower output power.

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Section: Static Analysismentioning

confidence: 99%

Design and Simulation of Small-Scale Waste Separation and Sorting Equipment

Zhang

2022

Processes

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“…The relationship between true stress and strain is one of the most significant input parameters that need to be introduced as tabular data. Thus, the engineering stress-strain data obtained from the literature [30][31][32][33][34] were first converted into the form of true strain (𝜀 true ) and true stress (𝜎 true ) using the following equations:…”

Section: Materials Constitutive Modelmentioning

confidence: 99%

“…This material model supports thermal features, and it is considered an appropriate material model for coupled thermal stress analysis. 35 In addition, the thermal-mechanical properties of Q345 and S700MC steels, such as stress-strain relations, thermal conductivity, convection and radiation coefficients, yield stress, and elastic modulus at elevated temperatures, which were collected from literature, [30][31][32][33][34] were used to define material's thermal property accurately. Subsequently, an induction heater is modeled and positioned near the sheet's bend area before the last forming stands, as shown in Figure 3.…”

Section: Parametric Studymentioning

confidence: 99%

Investigations of the through‐thickness residual stress distribution during the partial heating roll forming process of square and rectangular hollow steel sections

Mehari

Han

2022

Engineering Reports

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With the growing demand for rectangular and square hollow steel sections in the last few decades, the cold roll forming process has become a widely acknowledged manufacturing method. However, the residual stress generated during the roll forming process is one of the primary concerns on roll-formed products. One of the leading sources of residual stress is the severe plastic deformation that sheet metal experiences. It is well-known that residual stress significantly affects the product's service life. In this regard, several researchers have conducted numerical and experimental investigations of residual stress distributions on roll-formed steel sections. However, most of the studies found in the literature have been confined to the measurement of residual surface stresses. On the other hand, experimental studies conducted on fatigue and load-carrying capacity of hollow structural steels have shown that there is indeed a simple relation between the through-thickness residual stress distributions and mechanical properties of structures. Thus, this article employed a proper numerical modeling procedure using LS-DYNA's finite element code to explore through-thickness residual stress distributions generated during the roll forming process of rectangular and square hollow steel sections from different material grades. Moreover, a small-scale parametric study was conducted to explore the effects of the partial heating roll forming method on through-the-thickness residual stress distributions.

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“…One of the defensive actions that can be adopted is structural cooling where the aim is to cool the load bearing elements to prevent structure failure. But as sudden cooling of structural elements at high temperatures (> 600°C) can result in significant change in material properties and load bearing capacity [16,17], it is unclear how the structural cooling affects the safety of the building. In large openframe buildings (floor area > 500 m 2 ) with unprotected structural elements, both the fire and the fire intervention may contribute to the risk of structural failure.…”

Section: Introductionmentioning

confidence: 99%

Impact of Firefighting Sprays on the Fire Performance of Structural Steel Members

et al. 2022

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The feasibility of coupled computational fluid dynamics (CFD) and finite element (FE) simulations to aid the planning of fire intervention tactics and the effectiveness of structural cooling during firefighting were investigated. Water sprays, generated using fire monitors, were characterized using bucket tests and the results were used for calibrating the CFD spray model. The cooling ability of the sprays was measured experimentally by applying them onto a fire exposed steel beam. The experimental results showed that water application produces a sudden drop in steel temperatures and after 10–15 s, no significant further reduction in temperature was observed. The CFD-FE coupling was performed using the adiabatic surface temperature method, extended here to include the cooling by water droplets. The coupled CFD-FE model was validated using the experimental data and applied to simulate the intervention to a developing warehouse fire, showing how an attempt to cool the structure reduces the temperatures but does not stall the fire-spread. In fact, the intervention -induced vapor generation was found to enhance the flow of hot gases and accelerate the fire-spread if the water resources are inadequate. Thermal and stress analyses of the cooled and uncooled truss beams were performed, showing how the spray cooling halted the truss mid-span deformation.

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Mechanical properties of Q345 structural steel after artificial cooling from elevated temperatures

Cited by 34 publications

References 27 publications

Design and Simulation of Small-Scale Waste Separation and Sorting Equipment

Design and Simulation of Small-Scale Waste Separation and Sorting Equipment

Investigations of the through‐thickness residual stress distribution during the partial heating roll forming process of square and rectangular hollow steel sections

Impact of Firefighting Sprays on the Fire Performance of Structural Steel Members

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