Article
Chemistry, Multidisciplinary
Shem Maube, Japheth Obiko, Josias van der Merwe, Fredrick Mwema, Desmond Klenam, Michael Bodunrin
Summary: This study compares the hot deformation behavior of virgin (steel A) and rejuvenated heat treatment creep-exhausted (steel B) P91 steels. The results show that flow stress is influenced by deformation conditions, with an increase in strain rate leading to an increase in flow stress at a given temperature. The flow stress-strain curves exhibit dynamic recovery as the softening mechanism. The Arrhenius equations effectively describe the flow stress behavior of P91 steel.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Vitor E. C. Sousa, Francisco J. G. Silva, Antonio P. Pinho, Antonio B. Pereira, Olga C. Paiva
Summary: This study introduces four new heat treatment conditions for welding joints on P91 steel, aiming to reduce processing time, energy consumption, and achieve a better balance between mechanical strength and elongation after failure. These solutions result in a loss of approximately 14% in Ultimate Tensile Strength (UTS) compared to unwelded joints, but a gain of about 50% in elongation. Compared to the recommended solution in the codes, there is a decrease of 10% in UTS and an increase of 30% in elongation, saving significant time and energy in the treatment process.
Article
Materials Science, Multidisciplinary
Mohamed Harhash, Heinz Palkowski
Summary: Metal/polymer/metal sandwich sheets are promising functional materials with tailored mechanical properties, but forming is limited by load conveying mechanism; SPIF can extend the forming potential, but failure modes such as cracking and delamination exist during shaping process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Xinchang Feng, Xiyue Liu, Shuxin Bai, Yu Tang, Yicong Ye
Summary: This study investigates the dynamic tensile mechanical properties and deformation mechanism of TWIP steel at various high strain rates, providing important references for the potential demand for materials with excellent dynamic mechanical behavior in protective construction.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Coatings & Films
K. Bobzin, C. Kalscheuer, M. Carlet, S. Schmauder, V. Guski, W. Verestek, M. Tayyab
Summary: In this study, a machine learning algorithm was used to characterize the microstructure of a hard coating, and material model parameters for the coating, interlayer, and substrate were determined by fitting simulated force-displacement curves to experimental ones. The developed model can effectively simulate and validate the deformation behavior of a CrAlN coating during nanoindentation at different indentation loads.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Geological
Jibril B. Coulibaly, Alessandro F. Rotta Loria
Summary: This paper presents a theoretical and computational investigation of the transient dynamics characterizing the thermally induced deformation of sands under oedometric conditions. The study shows that the heating rates and the materials used can greatly affect the response of sands to thermal loads.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Mechanics
Hao Zhou, Huabin Yu, Xiaonan Han, Zhe Wang, Xiaogang Guo, Junfeng Qi, Xiaoyu Zhang, Hongyou Chai
Summary: This study proposes a near-zero thermal mismatch flexure metastructure that is inspired by plants and fabricated using additive manufacturing techniques. The experimental results show that the thermal flexure coefficient of this metastructure is reduced by 92.4% compared to traditional bi-material plates connected by screws. Mechanical vibration experiments demonstrate that the resonant frequency of this metastructure can reach up to 956 Hz, which is 5.8 times higher than the common requirements for spacecraft functional components. The excellent thermal shape stability and high-resonant frequency properties make it a potential candidate for structures working in variable thermal and mechanical environments.
COMPOSITE STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Xinchang Feng, Xiyue Liu, Shuxin Bai, Yicong Ye, Liang Zong, Yu Tang
Summary: The mechanical properties of TWIP steel at different strain rates were investigated and a dynamic constitutive model based on the test results was established and verified. The microstructures of TWIP steel before and after deformation were analyzed. The findings demonstrate the relationship between the micro deformation mechanism and the macro mechanical properties of TWIP steel at a specific strain rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
Yongfeng Li, Yunguang Zhang, Shuhui Li
Summary: In this study, a testing and parameter identification method for the viscoplastic constitutive behavior of boron steel based on the Gleeble system was proposed, along with an FEM-based optimization method to identify the hardening behavior under large deformation. Shear specimens were used for testing hardening behavior with more uniform temperature and strain rate distribution, and showed high accuracy in identifying the constitutive behavior of product phase. The proposed methods and models were verified through thermomechanical tension tests and hot semi-cutting processes, showing accurate results.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Optics
S. Sirohi, A. Gupta, C. Pandey, R. S. Vidyarthy, K. Guguloth, H. Natu
Summary: The research discovered that the optimal microstructure and mechanical properties of laser beam welded P91 and P22 steel joints can be obtained after post-weld heat treatment (PWHT).
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Marine
Mojtaba Mokhtari, Ekaterina Kim, Jurgen Amdahl
Summary: This study compares the CF model and the VUMAT plasticity model theoretically and numerically, highlighting the differences in results and discussing the influences of element size, mesh configuration, and failure parameters on the models. The research aims to provide insights into the performance and limitations of these plasticity models in simulating ice impact loads.
Article
Materials Science, Ceramics
Stefan Schachner, Shengli Jin, Dietmar Gruber, Harald Harmuth
Summary: This paper investigates the shear creep behavior of ordinary refractory ceramics and proposes an in-house asymmetric creep constitutive model. The results show that the shear creep of ordinary refractory ceramics is significantly different from uniaxial compressive/tensile creep.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
Pradyumna Kumar Parida, Arup Dasgupta, Shubhra Bajpai, T. Sakthivel, R. Mythili
Summary: Oxide dispersion strengthened (ODS) steels, containing Ti and Y2O3, show superior mechanical properties and creep-rupture life compared to modified 9Cr-1Mo (P91) steel. Optimizing the Y2O3 and Ti content in ODS steels governs the size and stoichiometry of the dispersoids, with equal amounts of Ti and Y2O3 resulting in finer and stable dispersoids. Two varieties of ODS alloys with different Ti and Y2O3 contents were synthesized and compared with P91 steel in terms of microstructure and microtexture.
Article
Engineering, Mechanical
Yooseob Song, Jaeheum Yeon, George Z. Voyiadjis
Summary: The mechanical behavior of a Martensitic Microcomposite Formable Steel alloy was investigated over a wide range of temperatures and strain rates, focusing on the effect of dynamic strain aging. A new constitutive model was proposed and validated using experimental data, showing a significant influence of dynamic strain aging on the material.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Chemistry, Physical
Chilou Zhou, Xianhui Liu, Yongjun Zhang, Hao Wu, Yuhang Yang
Summary: This study developed a numerical model to investigate the hydrogen transport and segregation in inclusions under stress conditions. The results showed that the shape and orientation of inclusions, presence of micro-cracks, and stress magnitude all affect hydrogen segregation. Inclusions with a globular shape and micro-cracks exhibited higher hydrogen concentrations, leading to an increased susceptibility to hydrogen embrittlement.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Manufacturing
Oussama Filali, Andre Dubois, Marcel Moghadam, Chris Nielsen, Laurent Dubar
Summary: A methodology based on finite element computations is proposed to predict the galling onset of aluminium alloys in cold forming. The model takes into account the effect of tangential stresses on damage evolution and considers the roughness of the tools. Strip reduction tests on AA6082 specimens were conducted to validate the numerical model, showing good agreement with experiments and the ability to predict the onset of galling accurately. The model is also able to determine the impact of tool roughness.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Review
Materials Science, Multidisciplinary
Hamed Aghajani Derazkola, Eduardo Garcia, Alberto Murillo-Marrod, Aintzane Conde Fernandez
Summary: This review paper presents the latest developments in the numerical analysis, microstructural simulation, and artificial intelligence methods for the hot deformation process of martensitic stainless steels (MSS). Modeling and simulation analysis can reduce the number of experiments and provide insights into the effects of strain and strain rate variations in manufacturing processes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Manufacturing
Hamed Aghajani Derazkola, Rasool MohammadiAbokheili, Naser Kordani, Eduardo Garcia, Alberto Murillo-Marrodan
Summary: The properties of a polymer-metal hybrid structure printed using fed friction stir additive manufacturing (FFSAM) were evaluated. The study found that injecting nanocomposite polymer during the printing process can fill voids and improve the physical and chemical properties of the printed structure.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Mikel Brun, Fernando Cortes, Jon Garcia-Barruetabena, Imanol Sarria, Maria Jesus Elejabarrieta
Summary: This paper presents a robust method to estimate the damping of polymers and compares it with other traditional methods. The study found that the curve-fitting method is best applied for further testing of polymeric materials when using the MDOF method and considering the residuals, along with the entire frequency range.
Article
Materials Science, Multidisciplinary
Hamed Aghajani Derazkola, Eduardo Garcia, Alberto Murillo-Marrodan
Summary: This study simulated the tube piercing process using the finite element method and analyzed the impact of different friction conditions at the contact interface. The results show that the choice of friction coefficient has a significant impact on energy consumption and normal stress on billet.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Industrial
Tomasz Bulzak, Zbigniew Pater, Janusz Tomczak, Lukasz Wojcik, Alberto Murillo-Marrodan
Summary: This paper investigates the influence of cross wedge rolling method on material fracture and proposes a new hybrid fracture criterion. Through finite element simulations and experimental studies, it is found that an increase in ovalization leads to an increase in the degree of damage to the forgings. Changing the rolling scheme can effectively reduce the degree of damage to the forgings.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Esperanza Diaz, Joseba Leon, Alberto Murillo-Marrodan, Sylvie Ribeiro, Senentxu Lanceros-Mendez
Summary: Biodegradable scaffolds of poly (L-lactide-co-epsilon-caprolactone) (PLCL) and reduced graphene oxide (rGO) were prepared using thermally induced phase separation method. The nonisothermal cold crystallization kinetics, electrical conductivity, and mechanical properties were investigated. The results showed that increasing cooling rate improved nonisothermal crystallization, but higher rGO concentration delayed crystallization at elevated temperatures. Addition of rGO led to a transition from insulating to conductive scaffolds, and improved the mechanical properties of the scaffolds.
Article
Engineering, Mechanical
Hans Boungomba, Philippe Moreau, Tarik Sadat, Rudy Dubois, Mirentxu Dubar, Laurent Dubar
Summary: In wire winding processes, thermal pretreatments result in the contamination of the wire with a mixture of lubricant and oxide, negatively impacting the tribological conditions and final product quality. The accumulation of this mixture during shaping leads to wear grooves on the wire guide. The presence of third-body particles initiates cracking and widening of these grooves. A pin-on-disc test is conducted to study the influence of oxide pollution and lubricant quality on the wire/tool contact conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Acoustics
Fernando Cortes, Ondiz Zarraga, Imanol Sarria, Maria Jesus Elejabarrieta
Summary: This paper investigates the eddy currents damping in a vibrating solid in a magnetic field using the Zener viscoelastic model. A coupled mechanical-electrical model is proposed, with the mechanical model as a single degree-of-freedom system and the electrical model as a closed RL circuit. The motion equation is derived for the coupled system under harmonic force and harmonic base motion excitations, which include derivatives up to the third order. An equivalence between the motion equations and a Zener model for viscoelastic systems is found, explaining the third order derivative forces observed in systems with eddy currents. The proposed model is validated through analytical comparison and experimental results, and a parametric study is conducted to investigate the influence of the magnetic field and electrical properties on the system's frequency and time responses.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Materials Science, Multidisciplinary
Benjamin Zielinski, Tarik Sadat, Bratislav Lukic, Gregory Haugou, Herve Morvan, Alexander Rack, Eric Markiewicz, Laurent Dubar
Summary: Magnetic Pulse Welding (MPW) is a growing method for joining dissimilar materials like aluminum and copper. Conventional tests are often used to evaluate the overall mechanical properties of the joint, but they cannot capture the local mechanical properties or the behavior of the joint under high strain rates. This study used specially designed samples of Al/Cu to investigate the mechanical properties of the joint through high strain-rate loading and synchrotron X-ray radiography. The results showed a correlation between the evolution of the joint interface and the presence of pre-existing cracks.
Article
Computer Science, Interdisciplinary Applications
Fernando Cortes, Mikel Brun, Maria Jesus Elejabarrieta
Summary: This paper presents a finite element formulation for the transient dynamic analysis of free layer damping plates, modeling the viscoelastic behavior using fractional derivatives. The method is validated by comparing the results with a finite element model built with hexahedral elements. The proposed formulation accurately reproduces the time response of plates with surface damping treatments and allows conventional plate mass and stiffness matrices to be used for each layer.
COMPUTERS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Fernando Cortes, Mikel Brun, Jon Garcia-Barruetabena, Imanol Sarria, Maria Jesus Elejabarrieta
Summary: This paper presents a method for identifying the dynamic mechanical properties of soft not self-supporting viscoelastic materials at high frequencies using sandwich beams. The method takes into account quadratic shear stress in the formulation, which improves the accuracy of identifying the stiffness of the core material at high frequencies. Experimental and numerical comparisons demonstrate the effectiveness of the proposed method.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
