scholarly journals FEM Study of a Steel Corrugated Web Plate Girder Subjected to Fire

2021 ◽  
Vol 26 (2) ◽  
pp. 201-218
Author(s):  
D. Sokołowski ◽  
M. Kamiński
Keyword(s):  
High Strength Steel ◽  
Constitutive Relations ◽  
High Strength ◽  
Experimental Tests ◽  
Physical Parameters ◽  
Bottom Flange ◽  
Gas Temperature ◽  
Temperature Dependent ◽  
Corrugated Web ◽  
Plate Girder

Abstract The main aim of this work is a computational nonlinear analysis of a high strength steel corrugated-web plate girder with a very detailed and realistic mesh including vertical ribs, all the fillet welds and supporting areas. The analysis is carried out to verify mechanical structural response under transient fire temperature conditions accounting for an efficiency and accuracy of three various transient coupled thermo-elastic models. All the resulting stress distributions, deformation modes and their time variations, critical loads and eigenfrequencies as well as failure times are compared in all these models. Nonlinearities include material, geometrical and contact phenomena up to the temperature fluctuations together with temperature-dependent constitutive relations for high strength steel. They result partially from steady state and transient experimental tests or from the additional designing rules included in Eurocodes. A fire scenario includes an application of the normative fire gas temperature curve on the bottom flange of the entire girder for a period of 180 minutes. It is computed using sequentially coupled thermo-elastic Finite Element Method analyses. These account for heat conductivity, radiation and convection. The FEM model consists of a combination of 3D hexahedral and tetrahedral solid finite elements and uses temperature-dependent material and physical parameters, whose values are taken after the experiments presented in Eurocodes. Numerical results presented here demonstrate a fundamental role of the lower flange in carrying fire loads according to this scenario and show a contribution of the ribs and of the welds to the strength of the entire structure.

scholarly journals Experimental and Numerical Investigation on the Perforation Resistance of Double-Layered Metal Shield under High-Velocity Impact of Armor-Piercing Projectiles

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 626
Author(s):  
Riccardo Scazzosi ◽  
Marco Giglio ◽  
Andrea Manes
Keyword(s):  
High Strength Steel ◽  
Steel Plate ◽  
Experimental Studies ◽  
Practical Interest ◽  
High Strength ◽  
Experimental Tests ◽  
Element Model ◽  
Transportation Systems ◽  
Metal Shield ◽  
Softening Parameter

In the case of protection of transportation systems, the optimization of the shield is of practical interest to reduce the weight of such components and thus increase the payload or reduce the fuel consumption. As far as metal shields are concerned, some investigations based on numerical simulations showed that a multi-layered configuration made of layers of different metals could be a promising solution to reduce the weight of the shield. However, only a few experimental studies on this subject are available. The aim of this study is therefore to discuss whether or not a monolithic shield can be substituted by a double-layered configuration manufactured from two different metals and if such a configuration can guarantee the same perforation resistance at a lower weight. In order to answer this question, the performance of a ballistic shield constituted of a layer of high-strength steel and a layer of an aluminum alloy impacted by an armor piercing projectile was investigated in experimental tests. Furthermore, an axisymmetric finite element model was developed. The effect of the strain rate hardening parameter C and the thermal softening parameter m of the Johnson–Cook constitutive model was investigated. The numerical model was used to understand the perforation process and the energy dissipation mechanism inside the target. It was found that if the high-strength steel plate is used as a front layer, the specific ballistic energy increases by 54% with respect to the monolithic high-strength steel plate. On the other hand, the specific ballistic energy decreases if the aluminum plate is used as the front layer.

Elasto-Plastic Property of High Strength Steel at Warm Temperature and its Springback

2013 ◽  
Vol 535-536 ◽  
pp. 385-388
Author(s):  
Naoko Saito ◽  
Mitsugi Fukahori ◽  
Daisuke Hisano ◽  
Yuya Ichikawa ◽  
Hiroshi Hamasaki ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
Elevated Temperatures ◽  
High Strength ◽  
Plastic Property ◽  
Bending Test ◽  
Warm Temperature ◽  
Temperature Dependent ◽  
Strain Responses ◽  
Springback Behavior

Stress-strain responses of a high strength steel sheet of 980MPa grade under uniaxial tension and its springback in V- and U-bending were investigated at elevated temperatures ranging from 573-973K. The flow stress decreased drastically with the increase of temperature, from which it was expected that springback is reduced by warm forming. In V-bending test, however, the temperature effect on springback was not so clear, while in U-bending springback decreased with temperature rise. It was found that such difference in temperature dependent springback behavior between V- and U-bending was caused by stress relaxation which took place during unloading process.

scholarly journals Temperature-dependent yield criterion for high strength steel sheets under warm-forming conditions

2015 ◽  
Vol 21 ◽  
pp. 07008 ◽  
Author(s):  
Zhengyang Cai ◽  
Keshan Diao ◽  
Xiangdong Wu ◽  
Min Wan ◽  
Cheng Cheng
Keyword(s):  
High Strength Steel ◽  
Yield Criterion ◽  
High Strength ◽  
Warm Forming ◽  
Temperature Dependent ◽  
Steel Sheets

scholarly journals Material Behavior Description for a Large Range of Strain Rates from Low to High Temperatures: Application to High Strength Steel

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 795 ◽  
Author(s):  
Pierre Simon ◽  
Yaël Demarty ◽  
Alexis Rusinek ◽  
George Voyiadjis
Keyword(s):  
High Strength Steel ◽  
Constitutive Relations ◽  
High Strength ◽  
Numerical Approach ◽  
Complex Stress ◽  
Material Behavior ◽  
Experimental Results ◽  
Large Field ◽  
Strain Rates ◽  
Behavior Description

Current needs in the design and optimization of complex protective structures lead to the development of more accurate numerical modelling of impact loadings. The aim of developing such a tool is to be able to predict the protection performance of structures using fewer experiments. Considering only the numerical approach, the most important issue to have a reliable simulation is to focus on the material behavior description in terms of constitutive relations and failure model for high strain rates, large field of temperatures and complex stress states. In this context, the present study deals with the dynamic thermo-mechanical behavior of a high strength steel (HSS) close to the Mars® 190 (Industeel France, Le Creusot, France). For the considered application, the material can undergo both quasi-static and dynamic loadings. Thus, the studied strain rate range is varying from 10−3–104 s−1. Due to the fast loading time, the local temperature increase during dynamic loading induces a thermal softening. The temperature sensitivity has been studied up to 473 K under quasi-static and dynamic conditions. Low temperature measurements (lower than the room temperature) are also reported in term of σ − ε | ε ˙ , T curves. Experimental results are then used to identify the parameters of several constitutive relations, such as the model developed initially by Johnson and Cook; Voyiadjis and Abed; and Rusinek and Klepaczko respectively termed Johnson–Cook (JC), Voyiadjis–Abed (VA), and Rusinek–Klepaczko (RK). Finally, comparisons between experimental results and model predictions are reported and compared.

Design and Testing of a New Metallic Solution for Toecap Component on Safety Footwear

2010 ◽  
Vol 44-47 ◽  
pp. 1460-1464
Author(s):  
Sérgio Costa ◽  
N. Peixinho ◽  
J.P. Mendonça
Keyword(s):  
Work Hardening ◽  
High Strength Steel ◽  
High Strength ◽  
Experimental Tests ◽  
Linear Analysis ◽  
Strength Increase ◽  
Innovative Solution ◽  
Plastic Domain ◽  
Steel Dp600 ◽  
Design And Testing

This paper explores an innovative solution based on the geometric redesign of integrant safety shoe`s component, the toe cap component. The investigation program covered some steps as the computational modeling of the toecap component, a set of numerical simulations in the FEM context with the toecap model discretization used for multiple Non-Linear Analysis on plastic domain, and experimental tests for ISO EN 20345 certification to support and comparing results. The aim of the study is to explore the work hardening phenomenon of the high strength steel DP600 on toecap component formed, to predict an expected mechanical strength increase and a consequent significant reduction of the weight. The study points to a thickness decreasing value of approximately 50% and equivalent reduce of weight.

scholarly journals NUMERICAL STUDY OF FLANGE BUCKLING BEHAVIOR OF HIGH-STRENGTH STEEL CORRUGATED WEB I-GIRDERS

2021 ◽  
Vol 49 (1) ◽  
pp. 85-106
Author(s):  
Amr Saddek ◽  
Sedky Tohamy ◽  
Amr Elsayed ◽  
Ahmed Attia M. Drar
Keyword(s):  
High Strength Steel ◽  
Numerical Study ◽  
High Strength ◽  
Buckling Behavior ◽  
Corrugated Web

Experimental study on post-fire mechanical performances of high strength steel Q460

2021 ◽  
pp. 136943322110106
Author(s):  
Lan Kang ◽  
Bin Wu ◽  
Xinpei Liu ◽  
Hanbin Ge
Keyword(s):  
Experimental Data ◽  
Ductile Fracture ◽  
High Strength Steel ◽  
Heating Temperature ◽  
Full Range ◽  
High Strength ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Experimental Results ◽  
Mechanical Performances

A series of experimental tests for investigating the post-fire mechanical (PFM) and post-fire fracture (PFF) performances of high strength steel Q460 are reported in this paper. All Q460 coupon specimens are heated up to a designated temperature which is selected from 100 to 900°C and then cooled down naturally to room temperature. Tensile tests are conducted to obtain their completely full-range post-fire stress-strain curves and the corresponding mechanical properties. The obtained experimental results show that with an increase in the heating temperature, the post-fire yield strength and ultimate strength of the Q460 structural steel decrease particularly when the heating temperature is over 650°C, but the post-fire elongation enhances. Ductile fracture behaviour of the coupon specimens under axial tensile loading can also be observed through the tensile coupon tests. The obtained experimental data are compared with the other results found in the open literatures on Grade 460 high strength steel. Based on a wider range of experimental data sets, predictive equations for evaluating the PFM properties of Grade 460 high strength steel are proposed. The experimental results presented in this study will provide benchmark data for the future calibration of complex ductile fracture parameters applied in numerical simulation.

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