Pub Date : 2023-01-01DOI: 10.4236/mnsms.2023.132002
Alain Ngenzi, S. Akinlabi, A. Muchiri
{"title":"Predicting the Volume Fraction of Martensite in Welded Mild Steel Joint Reinforced with Titanium Alloy Powder","authors":"Alain Ngenzi, S. Akinlabi, A. Muchiri","doi":"10.4236/mnsms.2023.132002","DOIUrl":"https://doi.org/10.4236/mnsms.2023.132002","url":null,"abstract":"","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.4236/mnsms.2023.133003
Nkrumah Jacob Kwaku, B. Ziblim, Sulemana Yahaya, S. Amedorme
{"title":"Modal and Thermal Analysis of a Modified Connecting Rod of an Internal Combustion Engine Using Finite Element Method","authors":"Nkrumah Jacob Kwaku, B. Ziblim, Sulemana Yahaya, S. Amedorme","doi":"10.4236/mnsms.2023.133003","DOIUrl":"https://doi.org/10.4236/mnsms.2023.133003","url":null,"abstract":"","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70498007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.4236/mnsms.2023.134004
Idrissa Diomandé, Amal Bouich, Aka Aka Hyacinthe, Bernabe Mari Soucasse, Aka Boko
The exploitation of fossil resources to meet humanity’s energy needs is the root cause of the climate warming phenomenon facing the planet. In this context, non-carbon-based energies, such as photovoltaic energy, are identified as crucial solutions. Organic perovskites MAPbI3 and FAPbI3, characterized by their abundance, low cost, and ease of synthesis, are emerging as candidates for study to enhance their competitiveness. It is within this framework that this article presents a comparative analysis of the performances of MAPbI3 and FAPbI3 perovskites in the context of photovoltaic devices. The analysis focuses on the optoelectronic characteristics and stability of these high-potential materials. The optical properties of perovskites are rigorously evaluated, including band gaps, photoluminescence, and light absorption, using UV-Vis spectroscopy and photoluminescence techniques. The crystal structure is characterized by X-ray diffraction, while film morphology is examined through scanning electron microscopy. The results reveal significant variations between the two types of perovskites, directly impacting the performance of resulting solar devices. Simultaneously, the stability of perovskites is subjected to a thorough study, exposing the materials to various environmental conditions, highlighting key determinants of their durability. Films of MAPbI3 and FAPbI3 demonstrate distinct differences in terms of topography, optical performance, and stability. Research has unveiled that planar perovskite solar cells based on FAPbI3 offer higher photoelectric conversion efficiency, surpassing their MAPbI3-based counterparts in terms of performance. These advancements aim to overcome stability constraints and enhance the long-term durability of perovskites, ultimately aiming for practical application of these materials. This comprehensive comparative analysis provides an enlightened understanding of the optoelectronic performance and stability of MAPbI3 and FAPbI3 perovskites, which is critically important to guide future research and development of solar devices that are both more efficient and sustainable.
{"title":"Comparative Performance Analysis of MAPbI<sub>3</sub> and FAPbI<sub>3</sub> Perovskites: Study of Optoelectronic Properties and Stability","authors":"Idrissa Diomandé, Amal Bouich, Aka Aka Hyacinthe, Bernabe Mari Soucasse, Aka Boko","doi":"10.4236/mnsms.2023.134004","DOIUrl":"https://doi.org/10.4236/mnsms.2023.134004","url":null,"abstract":"The exploitation of fossil resources to meet humanity’s energy needs is the root cause of the climate warming phenomenon facing the planet. In this context, non-carbon-based energies, such as photovoltaic energy, are identified as crucial solutions. Organic perovskites MAPbI3 and FAPbI3, characterized by their abundance, low cost, and ease of synthesis, are emerging as candidates for study to enhance their competitiveness. It is within this framework that this article presents a comparative analysis of the performances of MAPbI3 and FAPbI3 perovskites in the context of photovoltaic devices. The analysis focuses on the optoelectronic characteristics and stability of these high-potential materials. The optical properties of perovskites are rigorously evaluated, including band gaps, photoluminescence, and light absorption, using UV-Vis spectroscopy and photoluminescence techniques. The crystal structure is characterized by X-ray diffraction, while film morphology is examined through scanning electron microscopy. The results reveal significant variations between the two types of perovskites, directly impacting the performance of resulting solar devices. Simultaneously, the stability of perovskites is subjected to a thorough study, exposing the materials to various environmental conditions, highlighting key determinants of their durability. Films of MAPbI3 and FAPbI3 demonstrate distinct differences in terms of topography, optical performance, and stability. Research has unveiled that planar perovskite solar cells based on FAPbI3 offer higher photoelectric conversion efficiency, surpassing their MAPbI3-based counterparts in terms of performance. These advancements aim to overcome stability constraints and enhance the long-term durability of perovskites, ultimately aiming for practical application of these materials. This comprehensive comparative analysis provides an enlightened understanding of the optoelectronic performance and stability of MAPbI3 and FAPbI3 perovskites, which is critically important to guide future research and development of solar devices that are both more efficient and sustainable.","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136207615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.4236/mnsms.2023.131001
Donafologo Soro, Sekou Toure, A. Sylla, Amal Bouich, Julia Marí-Guaita, S. Touré, B. M. Soucase
{"title":"Numerical Simulation of Tandem Using ZnS as a Buffer Layer Cu I<sub>(1-<i>x</i>) </sub>Ca<sub><i>x</i></sub>Se<sub>2</sub>/CuGaSe<sub>2</sub>","authors":"Donafologo Soro, Sekou Toure, A. Sylla, Amal Bouich, Julia Marí-Guaita, S. Touré, B. M. Soucase","doi":"10.4236/mnsms.2023.131001","DOIUrl":"https://doi.org/10.4236/mnsms.2023.131001","url":null,"abstract":"","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4236/mnsms.2022.122002
Donafologo Soro, A. Sylla, N’Guessan Armel Ignace, Aboudoulaye Toure, Amal Bouich, S. Touré, B. Marí
{"title":"Simulation of a CIGS Solar Cell with CIGSe<sub>2</sub>/MoSe<sub>2</sub>/Mo Rear Contact Using AFORS-HET Digital Simulation Software","authors":"Donafologo Soro, A. Sylla, N’Guessan Armel Ignace, Aboudoulaye Toure, Amal Bouich, S. Touré, B. Marí","doi":"10.4236/mnsms.2022.122002","DOIUrl":"https://doi.org/10.4236/mnsms.2022.122002","url":null,"abstract":"","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.4236/mnsms.2022.122003
I. Abubakar, H. Gong, S. Nammi, L. Marston, J. Deane
The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing chambers of melt overflow process were developed. Multiphysics analyses involving heat transfer, fluid flow and particle tracking were carried out using COMSOL code. The influence of air jet configurations on the fibre distribution was studied. The fibres settled on the moving bed within the mixing chamber were examined for their uniformity. The effect of additional air jets to the existing chamber in a range of regions was explored. An optimum configuration was identified by analyzing the compactness of the particle clusters deposited in the simulation and validated using pixel data acquired from real time imaging. The results showed that by employing dual air jets at the front end of the chamber, the density of the fibre material has improved. We conclude that through multi-physics modelling, it was possible to identify the optimum air-jet configurations leading to fibre uniformity and its distribution. This work also paves the way for incorporating a vision system to evaluate fibre density in real time.
{"title":"Modelling the Influence of Air Jet Configurations on Non-Woven Steel Fibre Mixing in the Melt Overflow Process","authors":"I. Abubakar, H. Gong, S. Nammi, L. Marston, J. Deane","doi":"10.4236/mnsms.2022.122003","DOIUrl":"https://doi.org/10.4236/mnsms.2022.122003","url":null,"abstract":"The mixing of non-woven steel fibres in melt overflow process for use in automotive muffler systems was simulated. The aim was to identify optimum parameters for achieving a good fibre mix. Numerical models of mixing chambers of melt overflow process were developed. Multiphysics analyses involving heat transfer, fluid flow and particle tracking were carried out using COMSOL code. The influence of air jet configurations on the fibre distribution was studied. The fibres settled on the moving bed within the mixing chamber were examined for their uniformity. The effect of additional air jets to the existing chamber in a range of regions was explored. An optimum configuration was identified by analyzing the compactness of the particle clusters deposited in the simulation and validated using pixel data acquired from real time imaging. The results showed that by employing dual air jets at the front end of the chamber, the density of the fibre material has improved. We conclude that through multi-physics modelling, it was possible to identify the optimum air-jet configurations leading to fibre uniformity and its distribution. This work also paves the way for incorporating a vision system to evaluate fibre density in real time.","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-21DOI: 10.4236/mnsms.2021.113004
H. Lu, Juling Zhou, Cuiling Dong
In the applications of COX regression models, we always encounter data sets that contain too many variables that only a few of them contribute to the model. Therefore, it will waste much more samples to estimate the “noneffective” variables in the inference. In this paper, we use a sequential procedure for constructing the fixed size confidence set for the “effective” parameters to the model based on an adaptive shrinkage estimate such that the “effective” coefficients can be efficiently identified with the minimum sample size. Fixed design is considered for numerical simulation. The strong consistency, asymptotic distributions and convergence rates of estimates under the fixed design are obtained. In addition, the sequential procedure is shown to be asymptotically optimal in the sense of Chow and Robbins (1965).
{"title":"Sequential Shrinkage Estimate for COX Regression Models with Uncertain Number of Effective Variables","authors":"H. Lu, Juling Zhou, Cuiling Dong","doi":"10.4236/mnsms.2021.113004","DOIUrl":"https://doi.org/10.4236/mnsms.2021.113004","url":null,"abstract":"In the applications of COX regression models, we always encounter data \u0000sets that contain too many variables that \u0000only a few of them contribute to the model. Therefore, it will waste \u0000much more samples to estimate the “noneffective” variables in the inference. In \u0000this paper, we use a sequential procedure for constructing the \u0000fixed size confidence set for the “effective” parameters to the model based on \u0000an adaptive shrinkage estimate such that the “effective” coefficients can be \u0000efficiently identified with the minimum sample size. Fixed design is considered \u0000for numerical simulation. The strong consistency, asymptotic distributions and \u0000convergence rates of estimates under the fixed design are obtained. In addition, \u0000the sequential procedure is shown to be asymptotically optimal in the sense of \u0000Chow and Robbins (1965).","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47368306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-29DOI: 10.4236/MNSMS.2021.111001
A. Siddique, T. Khraishi
Simulation of dislocation dynamics opens the opportunity for researchers and scientists to observe in-depth many plastic deformation phenomena. In 2D or 3D media, modeling of physical boundary conditions accurately is one of the keys to the success of dislocation dynamics (DD) simulations. The scope of analytical solutions is restricted and applies to specific configurations only. But in dynamics simulations, the dislocations’ shape and orientation change over time thus limiting the use of analytical solutions. The authors of this article present a mesh-based generalized numerical approach based on the collocation point method. The method is applicable to any number of dislocations of any shape/orientation and to different computational domain shapes. Several verifications of the method are provided and successful implementation of the method in 3D DD simulations have been incorporated. Also, the effect of free surfaces on the Peach-Koehler force has been computed. Lastly, the effect of free surfaces on the flow stress of the material has been studied. The results clearly showed a higher force with increased closeness to the free surface and with increased dislocation segment length. The simulations’ results also show a softening effect on the flow stress results due to the effect of the free surfaces.
{"title":"A Mesh-Independent Brute-Force Approach for Traction-Free Corrections in Dislocation Problems","authors":"A. Siddique, T. Khraishi","doi":"10.4236/MNSMS.2021.111001","DOIUrl":"https://doi.org/10.4236/MNSMS.2021.111001","url":null,"abstract":"Simulation of dislocation dynamics opens the opportunity for researchers and scientists to observe in-depth many plastic deformation phenomena. In 2D or 3D media, modeling of physical boundary conditions accurately is one of the keys to the success of dislocation dynamics (DD) simulations. The scope of analytical solutions is restricted and applies to specific configurations only. But in dynamics simulations, the dislocations’ shape and orientation change over time thus limiting the use of analytical solutions. The authors of this article present a mesh-based generalized numerical approach based on the collocation point method. The method is applicable to any number of dislocations of any shape/orientation and to different computational domain shapes. Several verifications of the method are provided and successful implementation of the method in 3D DD simulations have been incorporated. Also, the effect of free surfaces on the Peach-Koehler force has been computed. Lastly, the effect of free surfaces on the flow stress of the material has been studied. The results clearly showed a higher force with increased closeness to the free surface and with increased dislocation segment length. The simulations’ results also show a softening effect on the flow stress results due to the effect of the free surfaces.","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48894349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-22DOI: 10.4236/mnsms.2020.103004
M. Villa, J. Brooks, R. Turner, M. Ward
The microstructural kinetics of β grain growth in the β field of a Ti-6Al-4V alloy was studied by a series of controlled heat treatments at constant temperature rates. Heating rates of 5°C/s, 50°C/s and 500°C/s were considered, stopping at different peak temperatures. The thickness evolution of martensitic needles and lamellar α laths, formed on cooling, was also investigated, by soaking the material above its β-transus temperature and cooling down at 5°C/s, 50°C/s, 100°C/s and 300°C/s till ambient temperature. Quantitative microstructural analyses were used to measure the particle dimensions. The β grain growth kinetics was reasonably well described by a modified Avrami equation. The thickness of α lamellae was a function of the cooling rate and the β grain dimension in which they nucleated. The martensite needle thickness was shown to be a function of the cooling rate to which the material was subjected.
{"title":"Microstructural Modeling of Thermally-Driven β Grain Growth, Lamellae & Martensite in Ti-6Al-4V","authors":"M. Villa, J. Brooks, R. Turner, M. Ward","doi":"10.4236/mnsms.2020.103004","DOIUrl":"https://doi.org/10.4236/mnsms.2020.103004","url":null,"abstract":"The microstructural kinetics of β grain growth in the β field of a \u0000Ti-6Al-4V alloy was studied by a series of controlled heat treatments at \u0000constant temperature rates. Heating rates of 5°C/s, 50°C/s and 500°C/s were \u0000considered, stopping at different peak temperatures. The thickness evolution of \u0000martensitic needles and lamellar α laths, formed on cooling, was also investigated, by soaking the material above \u0000its β-transus temperature and cooling \u0000down at 5°C/s, 50°C/s, 100°C/s and 300°C/s till ambient temperature. \u0000Quantitative microstructural analyses were used to measure the particle \u0000dimensions. The β grain growth \u0000kinetics was reasonably well described by a modified Avrami equation. The thickness \u0000of α lamellae was a function of the \u0000cooling rate and the β grain \u0000dimension in which they nucleated. The martensite needle thickness was shown to \u0000be a function of the cooling rate to which the material was subjected.","PeriodicalId":60895,"journal":{"name":"材料科学建模与数值模拟(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44711025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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