This page has only limited features, please log in for full access.
Research on T-configuration aluminum constructions effectively decreases fuel consumption, increases strength, and develops aerial structures. In this research, the effects of friction stir welding (FSW) tool offset (TO) on Al–Mg–Si alloy mixing and bonding in T-configurations is studied. The process is simulated by the computational fluid dynamic (CFD) technique to better understand the material mixing flow and the bonding between the skin and flange during FSW. According to the results, the best material flow can be only achieved at an appropriate TO. The appropriate TO generates enough material to fill the joint line and results in formation of the highest participation of the flange in the stir zone (SZ) area. The results show that, in the T-configuration, FSW joints provide raw materials from the retreating side (RS) of the flange that play a primary role in producing a sound mixing flow. The selected parameters were related to the geometric limitations of the raw sheets considered in this study. The failure point of all tensile samples was located on the flange. Surface tunneling is the primary defect in these joints, which is produced at high TOs. Among the analyzed cases, the most robust joint was made at +0.2 mm TO on the advancing side (AS), resulting in more than 60% strength of the base aluminum alloy being retained.
Shabbir Memon; Alberto Murillo-Marrodán; Hamid Lankarani; Hesamoddin Aghajani Derazkola. Analysis of Friction Stir Welding Tool Offset on the Bonding and Properties of Al–Mg–Si Alloy T-Joints. Materials 2021, 14, 3604 .
AMA StyleShabbir Memon, Alberto Murillo-Marrodán, Hamid Lankarani, Hesamoddin Aghajani Derazkola. Analysis of Friction Stir Welding Tool Offset on the Bonding and Properties of Al–Mg–Si Alloy T-Joints. Materials. 2021; 14 (13):3604.
Chicago/Turabian StyleShabbir Memon; Alberto Murillo-Marrodán; Hamid Lankarani; Hesamoddin Aghajani Derazkola. 2021. "Analysis of Friction Stir Welding Tool Offset on the Bonding and Properties of Al–Mg–Si Alloy T-Joints." Materials 14, no. 13: 3604.
The evolution of the microstructure changes during hot deformation of high-chromium content of stainless steels (martensitic stainless steels) is reviewed. The microstructural changes taking place under high-temperature conditions and the associated mechanical behaviors are presented. During the continuous dynamic recrystallization (cDRX), the new grains nucleate and growth in materials with high stacking fault energies (SFE). On the other hand, new ultrafine grains could be produced in stainless steel material irrespective of the SFE employing high deformation and temperatures. The gradual transformation results from the dislocation of sub-boundaries created at low strains into ultrafine grains with high angle boundaries at large strains. There is limited information about flow stress and monitoring microstructure changes during the hot forming of martensitic stainless steels. For this reason, continuous dynamic recrystallization (cDRX) is still not entirely understood for these types of metals. Recent studies of the deformation behavior of martensitic stainless steels under thermomechanical conditions investigated the relationship between the microstructural changes and mechanical properties. In this review, grain formation under thermomechanical conditions and dynamic recrystallization behavior of this type of steel during the deformation phase is discussed.
Hamed Derazkola; Eduardo García Gil; Alberto Murillo-Marrodán; Damien Méresse. Review on Dynamic Recrystallization of Martensitic Stainless Steels during Hot Deformation: Part I—Experimental Study. Metals 2021, 11, 572 .
AMA StyleHamed Derazkola, Eduardo García Gil, Alberto Murillo-Marrodán, Damien Méresse. Review on Dynamic Recrystallization of Martensitic Stainless Steels during Hot Deformation: Part I—Experimental Study. Metals. 2021; 11 (4):572.
Chicago/Turabian StyleHamed Derazkola; Eduardo García Gil; Alberto Murillo-Marrodán; Damien Méresse. 2021. "Review on Dynamic Recrystallization of Martensitic Stainless Steels during Hot Deformation: Part I—Experimental Study." Metals 11, no. 4: 572.
In the numerical simulation of hot forming processes, the correct description of material flow stress is very important for the accuracy of the results. For complex manufacturing processes, such as the rotary tube piercing (RTP), constitutive laws based on both power and exponential mathematical expressions are commonly used due to its inherent simplicity, despite the limitations that this approach involves, namely, the use of accumulated strain as a state parameter. In this paper, a constitutive model of the P91 steel derived from the evolution of dislocation density with strain, which takes into account the mechanisms of dynamic recovery (DRV) and dynamic recrystallization (DRX), is proposed for the finite element (FE) analysis of the RTP process. The material model is developed in an incremental manner to allow its implementation in the FE code FORGE®. The success of this implementation is confirmed by the good correlation between results of the simulation and experimental measurements of the manufactured tube (elongation, twist angle, mean wall thickness and eccentricity). In addition, this incremental model allows addressing how the restoring mechanisms of DRV and DRV occur during the RTP process. The analysis puts into evidence that DRV and DRX prevail over each other cyclically, following an alternating sequence during the material processing, due mainly to the effect of the strain rate on the material.
Alberto Murillo-Marrodán; Eduardo García; Jon Barco; Fernando Cortés. Application of an Incremental Constitutive Model for the FE Analysis of Material Dynamic Restoration in the Rotary Tube Piercing Process. Materials 2020, 13, 4289 .
AMA StyleAlberto Murillo-Marrodán, Eduardo García, Jon Barco, Fernando Cortés. Application of an Incremental Constitutive Model for the FE Analysis of Material Dynamic Restoration in the Rotary Tube Piercing Process. Materials. 2020; 13 (19):4289.
Chicago/Turabian StyleAlberto Murillo-Marrodán; Eduardo García; Jon Barco; Fernando Cortés. 2020. "Application of an Incremental Constitutive Model for the FE Analysis of Material Dynamic Restoration in the Rotary Tube Piercing Process." Materials 13, no. 19: 4289.
The wall thickness eccentricity is one of the most important weaknesses that appears in seamless tubes production, since this imperfection is subsequently transferred downstream through the manufacturing stages until the final product. For this reason, in this article a finite element model of the rotary tube piercing (RTP) process is developed aimed at analysing the wall thickness eccentricity imperfection. Experimental data extracted from the industrial process is used for the validation of the model, including operational process variables like power consumption and process velocity, and deformation variables as elongation and longitudinal torsion, originated by axial and shear strain respectively. The cause of longitudinal torsion is also analysed. The two most important conclusions derived from this study are: (I) the longitudinal torsion of the tube is a crucial parameter for the correct model validation, and (II) the combined effect between the uneven temperature distribution of the billet and the plug bending deformation is identified as the major cause of the wall thickness eccentricity flaw.
Alberto Murillo-Marrodán; Eduardo García; Jon Barco; Fernando Cortés. Analysis of Wall Thickness Eccentricity in the Rotary Tube Piercing Process Using a Strain Correlated FE Model. Metals 2020, 10, 1045 .
AMA StyleAlberto Murillo-Marrodán, Eduardo García, Jon Barco, Fernando Cortés. Analysis of Wall Thickness Eccentricity in the Rotary Tube Piercing Process Using a Strain Correlated FE Model. Metals. 2020; 10 (8):1045.
Chicago/Turabian StyleAlberto Murillo-Marrodán; Eduardo García; Jon Barco; Fernando Cortés. 2020. "Analysis of Wall Thickness Eccentricity in the Rotary Tube Piercing Process Using a Strain Correlated FE Model." Metals 10, no. 8: 1045.
In this article an analysis of the cone-type rotary piercing process of seamless tubes by means of a finite element model is presented. The originality of the proposed study is the utilisation of the shear strain of the material for the experimental validation of the model. The cone-type rotary piercing process is a complex procedure in which the material is subjected to severe plastic deformation and to surface twisting that leads to shear deformations. In addition, extreme friction conditions and high temperatures occur during the process which increase the difficulty of the process itself and its simulation. Consequently, the experimental validation of numerical models of the process cannot be accomplished exclusively based on power and velocity terms, as it is usually done. Instead, in this paper it is demonstrated how still another experimental parameter is required for the correct simulation of the process, which is the shear strain of the material, measured through the values of longitudinal surface twisting. This way, a new methodology for the analysis of the cone-type piercing process is proposed in the paper, which establishes a relationship between the material contact with the elements of the piercing mill and the resulting power consumption, process performance, forces exerted and longitudinal surface twisting of the material. Thanks to this methodology, it is shown that the relation between the material contact with the mandrel and the rolls in their initial surface region is responsible for the process performance, while the contact with the rolls in the region where the tube exits the piercing mill defines the surface twisting of the material and thus its shear deformation.
Alberto Murillo-Marrodán; Eduardo García; Fernando Cortés. Modelling of the cone-type rotary piercing process and analysis of the seamless tube longitudinal shear strain using industrial data. PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019 2019, 2113, 040003 .
AMA StyleAlberto Murillo-Marrodán, Eduardo García, Fernando Cortés. Modelling of the cone-type rotary piercing process and analysis of the seamless tube longitudinal shear strain using industrial data. PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019. 2019; 2113 (1):040003.
Chicago/Turabian StyleAlberto Murillo-Marrodán; Eduardo García; Fernando Cortés. 2019. "Modelling of the cone-type rotary piercing process and analysis of the seamless tube longitudinal shear strain using industrial data." PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019 2113, no. 1: 040003.
This paper presents a life cycle assessment (LCA) study that examines a number of scenarios that complement the primary use phase of electric vehicle (EV) batteries with a secondary application in smart buildings in Spain, as a means of extending their useful life under less demanding conditions, when they no longer meet the requirements for automotive purposes. Specifically, it considers a lithium iron phosphate (LFP) battery to analyze four second life application scenarios by combining the following cases: (i) either reuse of the EV battery or manufacturing of a new battery as energy storage unit in the building; and (ii) either use of the Spanish electricity mix or energy supply by solar photovoltaic (PV) panels. Based on the Eco-indicator 99 and IPCC 2007 GWP 20a methods, the evaluation of the scenario results shows that there is significant environmental benefit from reusing the existing EV battery in the secondary application instead of manufacturing a new battery to be used for the same purpose and time frame. Moreover, the findings of this work exemplify the dependence of the results on the energy source in the smart building application, and thus highlight the importance of PVs on the reduction of the environmental impact.
Christos Ioakimidis; Alberto Murillo-Marrodán; Ali Bagheri; Dimitrios Thomas; Konstantinos Genikomsakis. Life Cycle Assessment of a Lithium Iron Phosphate (LFP) Electric Vehicle Battery in Second Life Application Scenarios. Sustainability 2019, 11, 2527 .
AMA StyleChristos Ioakimidis, Alberto Murillo-Marrodán, Ali Bagheri, Dimitrios Thomas, Konstantinos Genikomsakis. Life Cycle Assessment of a Lithium Iron Phosphate (LFP) Electric Vehicle Battery in Second Life Application Scenarios. Sustainability. 2019; 11 (9):2527.
Chicago/Turabian StyleChristos Ioakimidis; Alberto Murillo-Marrodán; Ali Bagheri; Dimitrios Thomas; Konstantinos Genikomsakis. 2019. "Life Cycle Assessment of a Lithium Iron Phosphate (LFP) Electric Vehicle Battery in Second Life Application Scenarios." Sustainability 11, no. 9: 2527.
Alberto Murillo-Marrodán; E. Garcia; Fernando Cortés. A Study of Friction Model Performance in a Skew Rolling Process Numerical Simulation. International Journal of Simulation Modelling 2018, 17, 569 -582.
AMA StyleAlberto Murillo-Marrodán, E. Garcia, Fernando Cortés. A Study of Friction Model Performance in a Skew Rolling Process Numerical Simulation. International Journal of Simulation Modelling. 2018; 17 (4):569-582.
Chicago/Turabian StyleAlberto Murillo-Marrodán; E. Garcia; Fernando Cortés. 2018. "A Study of Friction Model Performance in a Skew Rolling Process Numerical Simulation." International Journal of Simulation Modelling 17, no. 4: 569-582.
In this chapter the existing friction conditions between the rolls and the workpiece of a hot skew roll piercing mill are evaluated. A modified model of this process without the inner plug has been simulated, using the Finite Element Method (FEM) and validated with experimental data extracted from the industrial process. Three friction laws have been considered for the simulation of the friction conditions between the rolls and the workpiece: Coulomb, Tresca and Norton. Then, their performance have been evaluated in terms of velocity, power consumption and sliding velocity at the interface. On the one hand, the inappropriateness of Coulomb law for this type of processes has been demonstrated. On the other hand, between Tresca and Norton laws, some differences are appreciable. Tresca law reproduces correctly the velocity of the process, but Norton law is more accurate regarding the estimation of frictional power losses. As hot rolling is a process with high energy consumption, Norton results to be the more complete law for the simulation of this kind of rolling processes.
Alberto Murillo-Marrodán; Eduardo García; Fernando Cortés. Study of Friction Model Effect on A Skew Hot Rolling Numerical Analysis. Transactions on Engineering Technologies 2018, 377 -387.
AMA StyleAlberto Murillo-Marrodán, Eduardo García, Fernando Cortés. Study of Friction Model Effect on A Skew Hot Rolling Numerical Analysis. Transactions on Engineering Technologies. 2018; ():377-387.
Chicago/Turabian StyleAlberto Murillo-Marrodán; Eduardo García; Fernando Cortés. 2018. "Study of Friction Model Effect on A Skew Hot Rolling Numerical Analysis." Transactions on Engineering Technologies , no. : 377-387.
This paper is aimed at modelling the flow behaviour of P91 steel at high temperature and a wide range of strain rates for constant and also variable strain-rate deformation conditions, such as those in real hot-working processes. For this purpose, an incremental physically-based model is proposed for the P91 steel flow behavior. This formulation considers the effects of dynamic recovery (DRV) and dynamic recrystallization (DRX) on the mechanical properties of the material, using only the flow stress, strain rate and temperature as state variables and not the accumulated strain. Therefore, it reproduces accurately the flow stress, work hardening and work softening not only under constant, but also under transient deformation conditions. To accomplish this study, the material is characterised experimentally by means of uniaxial compression tests, conducted at a temperature range of 900–1270 °C and at strain rates in the range of 0.005–10 s−1. Finally, the proposed model is implemented in commercial finite element (FE) software to provide evidence of the performance of the proposed formulation. The experimental compression tests are simulated using the novel model and the well-known Hansel–Spittel formulation. In conclusion, the incremental physically-based model shows accurate results when work softening is present, especially under variable strain-rate deformation conditions. Hence, the present formulation is appropriate for the simulation of the hot-working processes typically conducted at industrial scale.
Alberto Murillo-Marrodán; Eli Saul Puchi-Cabrera; Eduardo García; Mirentxu Dubar; Fernando Cortés; Laurent Dubar. An Incremental Physically-Based Model of P91 Steel Flow Behaviour for the Numerical Analysis of Hot-Working Processes. Metals 2018, 8, 269 .
AMA StyleAlberto Murillo-Marrodán, Eli Saul Puchi-Cabrera, Eduardo García, Mirentxu Dubar, Fernando Cortés, Laurent Dubar. An Incremental Physically-Based Model of P91 Steel Flow Behaviour for the Numerical Analysis of Hot-Working Processes. Metals. 2018; 8 (4):269.
Chicago/Turabian StyleAlberto Murillo-Marrodán; Eli Saul Puchi-Cabrera; Eduardo García; Mirentxu Dubar; Fernando Cortés; Laurent Dubar. 2018. "An Incremental Physically-Based Model of P91 Steel Flow Behaviour for the Numerical Analysis of Hot-Working Processes." Metals 8, no. 4: 269.