International Journal of Lightweight Materials and Manufacture最新文献

{"title":"Advances in the carbon-ceramic composites oxidation and ablation resistance: A review","authors":"Anna Didenko ,&nbsp;Alexey Astapov","doi":"10.1016/j.ijlmm.2024.07.007","DOIUrl":"10.1016/j.ijlmm.2024.07.007","url":null,"abstract":"<div><div>A review and critical analysis of recent advances in the field of oxidation and ablation resistance of carbon-ceramic composite materials, which are the most promising for high temperature applications in load-bearing structures and heat-protective systems of rocket and aerospace engineering, is carried out. The focus of this study is on the behavior of C_f/UHTC, C_f/C–UHTC, C_f/SiC–UHTC, and C_f/C–SiC–UHTC composites under thermochemical interaction with oxidizing gas flows. The workability of the composites is provided by the formation and evolution of passivating heterogeneous oxide films, which are represented mainly by the refractory MeO₂ phase and the glass phase modified by Me⁴⁺ cations (Me – Zr and/or Hf). The protective oxide layers slow down the mass transfer of reagents (due to the high gas density caused by the presence of phases in a viscous-fluid state) and resist mechanical erosion and denudation (due to the framework structure provided by the partial sintering of refractory phase grains). Systematization and generalization of experimental data for composites of various compositions was carried out, including consideration of fire exposure modes, realized temperatures and obtained characteristics of linear and mass ablation rates. The results of the generalization are presented in the form of tables and schematic images of microstructures of forming oxide films with layer detailing. It is demonstrated that a promising approach for improving developments is the introduction of additional refractory components, which facilitate the formation of solutions with the structure of Me_1-xTi_xO₂, Me_1-yTa_yO_2+0.5y, Me_1-yNb_yO_2+0.5y, and/or complex compounds such as Me₆Ta₂O₁₇, Me₆Nb₂O₁₇ and so on during operation. The formation of oxide films leads to an increase in the fraction of viscous-fluid substances, and, consequently, to a decrease in porosity and an increase in the gas density of protective layers. The processes of melting and transporting a portion of the mass from the surface facilitate the removal of a portion of the heat from the reaction zone, which in turn reduced the overall thermal load on the composites.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 87-126"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hybrid intelligence framework for optimizing shear capacity of lightweight FRP-reinforced concrete beams","authors":"Iman Faridmehr ,&nbsp;Moncef L. Nehdi ,&nbsp;Mohammad Ali Sahraei ,&nbsp;Kiyanets Aleksandr Valerievich ,&nbsp;Chiara Bedon","doi":"10.1016/j.ijlmm.2024.07.003","DOIUrl":"10.1016/j.ijlmm.2024.07.003","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This study rigorously assesses the shear capacity of fiber-reinforced polymer (FRP) reinforced concrete (RC) beams as a lightweight material alternative, scrutinizing the efficacy of the Eurocode and ACI design codes. Leveraging a dataset of 260 experimental FRP-RC beam cases, two distinct Artificial Neural Network (ANN) models were developed using the Levenberg-Marquardt algorithm. Beams with and without stirrups were considered, with parameters including beam width (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), depth (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), length (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), concrete compressive strength (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;mo&gt;′&lt;/mo&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), FRP modulus of elasticity (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) and FRP reinforcement ratios (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;). Multi-objective optimization was deployed to integrate Genetic Algorithms (GA) and &lt;em&gt;fmincon&lt;/em&gt; to optimize beam parameters for maximizing the shear capacity, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;V&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Sensitivity analysis allowed to quantify the influence of each parameter, revealing that &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; significantly affect &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;V&lt;/mi&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, with sensitivity scores of 0.39 and 0.35, respectively. The optimization process, highlighted by a 3D scatter plot, dynamically illustrated trade-offs among key design parameters (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), giving insights into the complex interplay in FRP beam design. The hybrid intelligence models reached superior predictive accuracy over traditional codes, achieving &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; values of 0.89. Notably, for beams without stirrups, model predictions closely matched experimental data, with a lower average ratio (1.02) compared to Eurocode (1.65) and ACI (1.58). Principal Component Analysis (PCA) has elucidated the intricate interactions among variables, thereby deepening insights into the structural dynamics of FRP-RC beams. Incorporating artificial intelligence, sophisticated optimization methodologies, and thorough statistical evaluations establishes a holistic approach for the structural examination of FRP-RC beams, providing improved precision and valuable viewpoints for the refinement of future desi","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 14-27"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141705508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wood flour / ceramic reinforced polylactic acid based 3D–printed functionally grade structural material for integrated engineering applications: A numerical and experimental characteristic investigation","authors":"Arunkumar Thirugnanasamabandam ,&nbsp;B. Prabhu ,&nbsp;Varsha Mageswari ,&nbsp;V. Murugan ,&nbsp;Karthikeyan Ramachandran ,&nbsp;Kumaran Kadirgama","doi":"10.1016/j.ijlmm.2024.08.003","DOIUrl":"10.1016/j.ijlmm.2024.08.003","url":null,"abstract":"<div><div>Recently, efforts have been done to capitalize on the potential of multidisciplinary research in order to produce unique features in polymer technology. To improve its physical and chemical properties for any intended use, the most promising Polylactic acid (PLA) has recently been copolymerized using other polymeric or non-polymeric components. This investigation aims to employ the material extrusion (MEX) process to develop a new functionally grade structural material (FGSM) by alternate layer deposition of wood flour reinforced PLA (WPLA) and ceramic reinforced PLA (CPLA). The mechanical properties of the printed laminates are examined using tensile, compression and three point bend tests. The microscopic investigation is used to assess fracture morphologies. A numerical simulation is also performed using ABAQUS under standardized parametric settings to investigate the mechanical behaviour of the laminates. The experimental and numerical results are consistent, with a deviation about ∼1 %. The tensile, compressive, and flexural strength of the newly developed FGSM are 61.39, 95.4, and 107.8 % higher than those of WPLA printed laminates. Furthermore, the acquired mechanical behaviour results are merely comparable to those of CPLA printed laminates. DSC thermograms demonstrate that FGSM has a better glass transition temperature (66°C) and a cold crystalline temperature (87.63°C), which contributes to its thermal stability. Overall, the newly developed FGSM might be considered a viable alternative, mechanically strong, and less expensive polymer composite material for structural built applications in any engineering and related fields.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 74-86"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural, electrochemical, and hot corrosion analysis of CoCrFeCuTi high entropy alloy reinforced titanium matrix composites synthesized by microwave sintering","authors":"S. Ragunath ,&nbsp;N. Radhika ,&nbsp;S Aravind Krishna ,&nbsp;Alokesh Pramanik","doi":"10.1016/j.ijlmm.2024.07.004","DOIUrl":"10.1016/j.ijlmm.2024.07.004","url":null,"abstract":"<div><div>CoCrFeCuTi High Entropy Alloy (HEA) is reinforced in Ti6Al6V2Sn alloy through microwave sintering-assisted powder metallurgy and its corrosion behaviour is investigated under different conditions. The ball-milled CoCrFeCuTi HEA powder exhibits 17 μm average particle size of irregular fragments with a single-phase BCC structure and is added as reinforcement in Ti alloy at 3, 6, 9, and 12 wt%. As more reinforcement is added, the α-Ti decreases and β-Ti increases which enhances the interfacial bonding. The pinning effects from reinforcements inhibit grain growth contributing to improved properties including higher relative density with less porosity. The 12 wt% composite showed remarkable microhardness of 734 HV which is increased by 43.8% over Ti alloy. The 12 wt% composite also achieved finer grains (0.345 μm) due to uniform internal heat generation from the process. Corrosion behaviour is assessed through electrochemical corrosion and hot corrosion analysis, with 12 wt% composite demonstrating better corrosion resistance compared to Ti alloy. The induced corrosion products, formation of passivation films, and their mechanism are examined by morphological analysis.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 141-155"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141702123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Natural fibre composite selection for two-stroke marine engine under-piston door using hybrid AHP and TOPSIS methods","authors":"Ru Vern Yiow,&nbsp;Muhd Ridzuan Mansor,&nbsp;Mohd Adrinata Shaharuzaman","doi":"10.1016/j.ijlmm.2024.07.006","DOIUrl":"10.1016/j.ijlmm.2024.07.006","url":null,"abstract":"<div><div>This article presents the selection process of natural fibre composites (NFC) material for the application of a two-stroke marine engine under-piston door (UPD) utilising a combination of the Analytical Hierarchy Process (AHP) with the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). NFC consists primarily of a biopolymer enforced with natural fibres. The selection of the best biopolymer and natural fibre was based upon key parameters, which represented the selection criteria. Natural fibre was selected based on four criteria; density, Tensile Strength (TS), Young's modulus (YM) and price. Biopolymer was selected based on an additional two criteria; flammability and melting point. A pairwise comparison was made for each criterion, establishing a matrix for the determination of the weightage using the AHP. This weightage was then applied into the TOPSIS method for the final ranking of natural fibre and biopolymer candidates. With a score of 0.870 in relative closeness to ideal solution, flax was determined to be the best natural fibre. Poly (lactic acid) obtained a score of 0.801 as the best biopolymer. Through this article, a synergy between AHP and TOPSIS methods were demonstrated in the selection and ranking of natural fibre and biopolymer as constituents of NFC for the potential application as alternative material for marine machinery application.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 66-73"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving high precision and productivity in laser machining of Ti6Al4V alloy: A comprehensive study using a n-predictor polynomial regression model and PSO algorithm","authors":"Avinash Chetry ,&nbsp;Sandesh Sanjeev Phalke ,&nbsp;Arup Nandy","doi":"10.1016/j.ijlmm.2024.09.001","DOIUrl":"10.1016/j.ijlmm.2024.09.001","url":null,"abstract":"<div><div>Ti-6Al-4V, the Titanium alloy, has significant utilizations in aerospace, automotive, and marine sectors for its low density and high strength at elevated temperature. But its chemical activity and low thermal conductivity inhibits its machining by conventional method. Nd: YAG laser beam machining (LBM) finds extensive use in rapid and precise cutting of Ti6Al4V. This study has examined the influences of various LBM machining variables, including laser power, gas pressure and stand-off distance, in cutting 5 mm thick Ti-6Al-4V plate. In assessing the effectiveness and performance of the LBM process, three response functions—surface roughness, angle of kerf, and material removal rate—have been designated. From the experimental data, different regression models have been established to estimate these response functions in terms of the machining parameters. Based on R² score and RMSE, multi-dimensional polynomial regression is decided as the most suitable regression model. Subsequently, the Particle Swarm Optimization technique has been applied to identify the optimal machining parameters for reducing angle of kerf and surface roughness, while increasing material removal rate. Three individual single-objective functions underwent optimization, along with a multi-objective function. Furthermore, experimental verification was conducted for the optimal input parameters in the single-objective as well as the multi-objective optimization scenarios, resulting in an accuracy of 97% and 98%, respectively. Such a close agreement emphasizes the accuracy of the developed regression model as well as it signifies the reliability and efficacy of the optimization technique.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 127-140"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural modification, mechanical properties, and wear behaviour of aged Al–Si–Mg/Si3N4 composites for aerospace applications","authors":"Chinmay Mundayadan Chandroth ,&nbsp;Jithin Vishnu ,&nbsp;Bassiouny Saleh ,&nbsp;K.R. Ananthakrishnan ,&nbsp;Deva Narayan A ,&nbsp;Aswin R. Kurup ,&nbsp;Sidharth S ,&nbsp;Karthik V. Shankar","doi":"10.1016/j.ijlmm.2024.07.005","DOIUrl":"10.1016/j.ijlmm.2024.07.005","url":null,"abstract":"<div><div>The main objective of the present research is to probe how ageing time influences the morphological, mechanical, and wear behaviour of stir cast Al–Si–Mg alloy, reinforced with 10 wt% Si₃N₄ particles subsequently heat treated in T₆ condition. The findings reveal that the presence of Si₃N₄ reinforcements, followed by the heat treatment, enhances the mechanical and tribological properties of the composite. The ensuing mechanical properties show significant improvement prior to aging heat treatment (180 °C/4h), reaching a hardness of 120.8 HV (45 % increase) and tensile strength of 275 MPa (50 % increment), respectively compared to as-cast composite. Fractography reveals dimples, transgranular cleavage surfaces, cracks, and micro-ploughing. Among the samples tested, the composite aged for 4 h (180 °C/4h, ASN-4) demonstrates the lowest wear rate. Abrasive and adhesive wear in combination is the primary wear mechanism in these samples. Overall, this research provides insights for research endeavors in manufacturing various components in the aerospace industry.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 38-52"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141841020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manufacture and characterization of lightweight sand-plastic composites made of plastic waste and sand: Effect of sand types","authors":"Salih Mekideche ,&nbsp;Mansour Rokbi ,&nbsp;Zine El Abidine Rahmouni ,&nbsp;Resego Phiri ,&nbsp;Sanjay Mavinkere Rangappa ,&nbsp;Suchart Siengchin","doi":"10.1016/j.ijlmm.2024.08.004","DOIUrl":"10.1016/j.ijlmm.2024.08.004","url":null,"abstract":"<div><div>Over the past decade, many types of waste have been exploited as feedstocks in different industries. Recycled plastics are among the waste sought for several civil engineering applications. In this work, various plastic-bonded sand composites based on polypropylene waste and silica sand were produced to serve as building materials in many construction applications. Many tests and analysis were carried out in this investigation. First of all, two initial used compounds (waste PP and various silica sand) were analyzed by using ATR-FTIR, XRF, and grain size distribution. In the second time, the different plastic-bonded sand composites were analyzed by using ATR-FTIR to assess their composition. On the other hand, mechanical, and physical tests such as three-point flexural strength, compressive strength, water absorption, and optical observation were applied on different produced composite samples, then the results were examined and analyzed. The results showed that the developed composites exhibit commendable mechanical properties, especially flexural and compression resistance, and minimal water absorption. It is worth noting that the plastic-bonded sand containing Khobana sand showed the highest flexural and compressive strength at 11.56 ± 0.36 and 26.19 ± 0.27 MPa, respectively, along with the lowest water absorption rate of 0.46%. This study confirms its contribution to enhancing sustainability and promoting the principles of the circular economy.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 1","pages":"Pages 53-65"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143099865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of electromagnetic stirring method on flow characteristics of A356 aluminum alloy melt","authors":"ZeWen Li ,&nbsp;Hao Chen ,&nbsp;Zheng Liu","doi":"10.1016/j.ijlmm.2024.12.004","DOIUrl":"10.1016/j.ijlmm.2024.12.004","url":null,"abstract":"<div><div>The effects of different stirring methods on the melt flow field and solidification structure of the alloy were studied by numerical simulation under the same stirring parameters. The results of numerical simulation and experimental study show that two-way continuous electromagnetic stirring (forward turning 6s, reverse turning 6s) is better than one-way continuous electromagnetic stirring (forward turning 12s) and two-way intermittent electromagnetic stirring (forward turning 6s, stop 1s, reverse turning 6s). A new process and process parameters for preparing semi-solid aluminum alloy slurry were formed and improved. When aluminum alloy melt was poured into the cast at 650 °C, the maximum melt flow rate was obtained under 4 A, 30 Hz, and bidirectional continuous electromagnetic stirring for 12s (forward rotation 6s, reverse 6s). At this time, the maximum X-axis flow rate of aluminum alloy melt was 82 mm/s. The maximum flow rate on the Y-axis is 72.5 mm/s, and the maximum flow rate on the Z-axis is 45.6 mm/s. At this time, the microstructure of the primary phase is the best, the average equal area circle diameter of the primary phase is 59.3 μm, and the average shape factor is 0.84.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 3","pages":"Pages 321-330"},"PeriodicalIF":0.0,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel framework to identify delamination location/size in BFRP pipe based on convolutional neural network (CNN) algorithm hybrid with capacitive sensors","authors":"Wael A. Altabey","doi":"10.1016/j.ijlmm.2024.12.002","DOIUrl":"10.1016/j.ijlmm.2024.12.002","url":null,"abstract":"<div><div>Failure detection-based Electrical Potential Change (EPC) is a promising technique. In this article, the internal layers delamination is inspected in basalt fiber-reinforced polymer (BFRP) pipe under long-term fatigue loading (LTFL) of internal pressure effect via an Electrical Capacitance Sensor (ECS) by evaluating the dielectric characteristics of pipe materials and classification between intact and delamination stats. The 3D maps of the capacitance array values and EPC distribution of node potential are tested. The maps can reflect delamination between pipe layers based on the researcher's previous works, however, because the pipes are modeled in 3D, therefore, the bending and twisted effects of the model make these maps not a good choice to accurately detect delamination location/size. Therefore, a new type of convolutional neural network (CNN) algorithm is adopted to train and test the EPC maps to evaluate delamination location/size. The training accuracy of the current technology (<span><math><mrow><mi>P</mi><mo>%</mo></mrow></math></span>), recall rate (<span><math><mrow><mi>R</mi><mo>%</mo></mrow></math></span>), and F-score (<span><math><mrow><mi>F</mi><mo>%</mo></mrow></math></span>) are equal to <span><math><mrow><mn>95.2</mn><mo>%</mo></mrow></math></span>, <span><math><mrow><mn>93.7</mn><mo>%</mo></mrow></math></span>, and <span><math><mrow><mn>90.9</mn><mo>%</mo></mrow></math></span> respectively, which indicates that the current technology shows identification efficiency and accuracy of the technology. The proposed method results converge with available traditional methods in the literature for assessing the delamination location/size such as the response surface methodology (RSM), and the error band from the diagonal line is less than <span><math><mrow><mn>4.86</mn></mrow></math></span> and <span><math><mrow><mn>1.14</mn></mrow></math></span> degrees for location and size respectively, thus validating the proposed technique's reliability, accuracy, and applicability for the relevant structures.</div></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":"8 3","pages":"Pages 393-401"},"PeriodicalIF":0.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}