Papers by Ridha Harzallah
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European Journal of Mechanics A-solids, 2021
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Finite Elements in Analysis and Design, Oct 1, 2022
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Applied Mechanics and Materials, Dec 1, 2011
Railway networks are subjected to more and more severe loading conditions requiring the use of st... more Railway networks are subjected to more and more severe loading conditions requiring the use of steels with a high resistance to wear and good fatigue behaviour. The surveys carried out on out of use equipment, such as rails or switches, show that these equipments fail by wear after quite a long period of use, but they can fail by fatigue in a substantially shorter time. In service, crossings are submitted to rolling, impact and sliding stresses. The impact-sliding is the result of the wheel transition from rail wing to crossing nose. Very high contact forces act on the crossing nose while such wheels are passing over it. These large contact forces between wheel and crossing can cause severe damage at crossing nose and wing rail. The influence of contact parameters on the damage of the crossing alloy (Hadfield steel GX120Mn13) in comparison with rail steel (R260) was investigated by impact and impact-sliding tests. The results are described and discussed using weight loss and microhardness measurements, optical and scanning electron microscopy observations of the contact surface. Examination of the results shows large plastic deformation in surface and subsurface of samples. In comparison with impact tests, sliding produces a change in size and shape of the contact area, a higher weight loss and lower hardening. A better impact–sliding wear resistance of Hadfield steel has been confirmed.
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Finite Elements in Analysis and Design
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European Journal of Mechanics - A/Solids, 2021
Abstract Nickel-based alloys are often selected for manufacturing components operating in extreme... more Abstract Nickel-based alloys are often selected for manufacturing components operating in extreme conditions such as high-temperature thermo-mechanical cyclic loadings because of their good corrosion and high temperature resistance. This is, for instance, the case for solar receivers where the material undergoes daily cycles going from ambient temperature to approximately 700 °C. To predict the material behavior under this type of complex loadings, advanced numerical models – such as Chaboche-type models – are required. In addition to the model, a complete representation of the temperature dependency of the material is essential for both numerical stability and physical accuracy of the model, which is obtained with parameters assuring a certain continuity over the studied range of temperature. To this end, a new formulation for the temperature dependency of material parameters in Chaboche-type models is proposed for the Alloy 230 under both anisothermal and isothermal cyclic loadings.
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SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, 2019
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Wear, 2010
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Http Www Theses Fr, 2010
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Applied Mechanics and Materials, 2011
Railway networks are subjected to more and more severe loading conditions requiring the use of st... more Railway networks are subjected to more and more severe loading conditions requiring the use of steels with a high resistance to wear and good fatigue behaviour. The surveys carried out on out of use equipment, such as rails or switches, show that these equipments fail by wear after quite a long period of use, but they can fail by fatigue in a substantially shorter time. In service, crossings are submitted to rolling, impact and sliding stresses. The impact-sliding is the result of the wheel transition from rail wing to crossing nose. Very high contact forces act on the crossing nose while such wheels are passing over it. These large contact forces between wheel and crossing can cause severe damage at crossing nose and wing rail. The influence of contact parameters on the damage of the crossing alloy (Hadfield steel GX120Mn13) in comparison with rail steel (R260) was investigated by impact and impact-sliding tests. The results are described and discussed using weight loss and microha...
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SOLARPACES 2019: International Conference on Concentrating Solar Power and Chemical Energy Systems
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Papers by Ridha Harzallah