Pranav Mehta, Ali Rıza Yıldız, S. M. Sait, B. Yildiz
In this article, a newly developed optimization approach based on a mathematics technique named the geometric mean optimization algorithm is employed to address the optimization challenge of the robot gripper, airplane bracket, and suspension arm of automobiles, followed by an additional three engineering problems. Accordingly, other challenges are the ten-bar truss, three-bar truss, tubular column, and spring systems. As a result, the algorithm demonstrates promising statistical outcomes when compared to other well-established algorithms. Additionally, it requires less iteration to achieve the global optimum solution. Furthermore, the algorithm exhibits minimal deviations in results, even when other techniques produce better or similar outcomes. This suggests that the proposed approach in this paper can be effectively utilized for a wide range of critical industrial and real-world engineering challenges.
{"title":"Enhancing the structural performance of engineering components using the geometric mean optimizer","authors":"Pranav Mehta, Ali Rıza Yıldız, S. M. Sait, B. Yildiz","doi":"10.1515/mt-2024-0005","DOIUrl":"https://doi.org/10.1515/mt-2024-0005","url":null,"abstract":"\u0000 In this article, a newly developed optimization approach based on a mathematics technique named the geometric mean optimization algorithm is employed to address the optimization challenge of the robot gripper, airplane bracket, and suspension arm of automobiles, followed by an additional three engineering problems. Accordingly, other challenges are the ten-bar truss, three-bar truss, tubular column, and spring systems. As a result, the algorithm demonstrates promising statistical outcomes when compared to other well-established algorithms. Additionally, it requires less iteration to achieve the global optimum solution. Furthermore, the algorithm exhibits minimal deviations in results, even when other techniques produce better or similar outcomes. This suggests that the proposed approach in this paper can be effectively utilized for a wide range of critical industrial and real-world engineering challenges.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141048870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A statics finite element (FE) model as well as a dynamics FE model for Sendzimir mill have been established. It is in order to solve the bilateral wave defect caused by loose edge rolling during the cold rolling process with SUS430 stainless steel strip. The profile and flatness control effects are quantitatively analyzed by adjusting various roll contour configurations such as work roll crown, the second intermediate idler roll crown, the first intermediate roll taper depth and taper length. The coupling relationship between strip edge-drop and flatness under different roll contour configurations has been studied to analyze their effects on flatness defect control. The first intermediate roll taper depth is the most effective way to control edge wave. The first intermediate roll taper depth has been adjusted from 0.4 mm to 0.6 mm in the industrial production line. The overall profile has been improved by 21.5 %. The deviation of residual stress at strip edges has been reduced by 32.9 %. An excellent flatness defect control result has been achieved for the industrial production of SUS430 stainless steel. The present work is responsible for providing a theoretical basis and practical experience for the flatness defect control technology of a Sendzimir mill.
{"title":"Flatness defect control during cold rolling of SUS430 stainless steel","authors":"Wenquan Sun, Jinming Li, N. Kong, Jie Zhang","doi":"10.1515/mt-2023-0389","DOIUrl":"https://doi.org/10.1515/mt-2023-0389","url":null,"abstract":"\u0000 A statics finite element (FE) model as well as a dynamics FE model for Sendzimir mill have been established. It is in order to solve the bilateral wave defect caused by loose edge rolling during the cold rolling process with SUS430 stainless steel strip. The profile and flatness control effects are quantitatively analyzed by adjusting various roll contour configurations such as work roll crown, the second intermediate idler roll crown, the first intermediate roll taper depth and taper length. The coupling relationship between strip edge-drop and flatness under different roll contour configurations has been studied to analyze their effects on flatness defect control. The first intermediate roll taper depth is the most effective way to control edge wave. The first intermediate roll taper depth has been adjusted from 0.4 mm to 0.6 mm in the industrial production line. The overall profile has been improved by 21.5 %. The deviation of residual stress at strip edges has been reduced by 32.9 %. An excellent flatness defect control result has been achieved for the industrial production of SUS430 stainless steel. The present work is responsible for providing a theoretical basis and practical experience for the flatness defect control technology of a Sendzimir mill.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140652359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lei Tian, Chao Feng, Molin Su, Lianyong Xu, Yongdian Han, Lei Zhao
The fatigue life extension approaches played an important role in ensuring the safety of marine engineering structures. This study conducted an in-depth analysis of the S–N curves of welded structures under different service environments and different fatigue life extension approaches, and found that the comprehensive life extension process of welding toe polishing and coating (the fatigue life was extended by 15–33 times compared to untreated samples) was the most significant approach under dry air medium environment. The comprehensive life extension process of welding toe polishing and coating (the fatigue life was extended by 10–25 times compared to untreated samples) was the most significant approach under salt spray corrosive medium environment. Moreover, the S–N curve and related parameters of welded joints of semi-submersible platform under different environmental media conditions and different combinations of fatigue life extension approaches were studied in depth, which had important guiding significance for practical life extension tools of jacket platform T-joints in practice.
{"title":"Experimental analysis of S–N curves of welded joints with different fatigue life extension approaches","authors":"Lei Tian, Chao Feng, Molin Su, Lianyong Xu, Yongdian Han, Lei Zhao","doi":"10.1515/mt-2023-0220","DOIUrl":"https://doi.org/10.1515/mt-2023-0220","url":null,"abstract":"\u0000 The fatigue life extension approaches played an important role in ensuring the safety of marine engineering structures. This study conducted an in-depth analysis of the S–N curves of welded structures under different service environments and different fatigue life extension approaches, and found that the comprehensive life extension process of welding toe polishing and coating (the fatigue life was extended by 15–33 times compared to untreated samples) was the most significant approach under dry air medium environment. The comprehensive life extension process of welding toe polishing and coating (the fatigue life was extended by 10–25 times compared to untreated samples) was the most significant approach under salt spray corrosive medium environment. Moreover, the S–N curve and related parameters of welded joints of semi-submersible platform under different environmental media conditions and different combinations of fatigue life extension approaches were studied in depth, which had important guiding significance for practical life extension tools of jacket platform T-joints in practice.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140652644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Corrosion assessment of steel-reinforced concrete specimens submerged in synthetic brine water with various chloride concentrations for 1–16 weeks was performed. Mass loss measurements combined with electrochemical techniques – half-cell potential, linear polarization (LP), and electrochemical impedance spectroscopy (EIS) – were employed. The results obtained from all corrosion assessments – on-site testing (half-cell potential measurements), laboratory scale (LP and EIS measurements), and destructive testing (mass loss or immersion measurements) – exhibited remarkable consistency, complementarity, and mutual supportiveness. Corrosion rate (CR) values from mass loss were close to those obtained from LP and EIS. The corrosion resistance decreased with increasing chloride concentration and immersion time, as indicated by the highest CR, Ca2+, and Fe2+ concentrations, and the lowest half-cell potential and polarization resistance. X-ray photoelectron spectroscopy investigation on the corroded steel surface revealed Fe(III) oxides and hydroxides and Fe(III) (FeCl3), corresponding to the reduction in polarization resistance in the LP and EIS results.
对浸没在不同氯化物浓度的合成盐水中 1-16 周的钢筋混凝土试样进行了腐蚀评估。采用了质量损失测量与电化学技术相结合的方法--半电池电位、线性极化（LP）和电化学阻抗光谱（EIS）。所有腐蚀评估结果--现场测试（半电池电位测量）、实验室规模（线性极化和 EIS 测量）和破坏性测试（质量损失或浸泡测量）--都表现出显著的一致性、互补性和相互支持性。质量损失法得出的腐蚀速率 (CR) 值与 LP 和 EIS 法得出的值相近。耐腐蚀性随氯化物浓度和浸泡时间的增加而降低，表现为 CR、Ca2+ 和 Fe2+ 浓度最高，半电池电位和极化电阻最低。对腐蚀钢表面进行的 X 射线光电子能谱研究发现了 Fe（III）氧化物和氢氧化物以及 Fe（III）（FeCl3），与 LP 和 EIS 结果中极化电阻的降低相对应。
{"title":"A comparative analysis of corrosion assessment techniques for steel in reinforced concrete exposed to brine water environments","authors":"P. Wongpanya, Dapanee Phangking, D. Phueakphum","doi":"10.1515/mt-2024-0044","DOIUrl":"https://doi.org/10.1515/mt-2024-0044","url":null,"abstract":"\u0000 Corrosion assessment of steel-reinforced concrete specimens submerged in synthetic brine water with various chloride concentrations for 1–16 weeks was performed. Mass loss measurements combined with electrochemical techniques – half-cell potential, linear polarization (LP), and electrochemical impedance spectroscopy (EIS) – were employed. The results obtained from all corrosion assessments – on-site testing (half-cell potential measurements), laboratory scale (LP and EIS measurements), and destructive testing (mass loss or immersion measurements) – exhibited remarkable consistency, complementarity, and mutual supportiveness. Corrosion rate (CR) values from mass loss were close to those obtained from LP and EIS. The corrosion resistance decreased with increasing chloride concentration and immersion time, as indicated by the highest CR, Ca2+, and Fe2+ concentrations, and the lowest half-cell potential and polarization resistance. X-ray photoelectron spectroscopy investigation on the corroded steel surface revealed Fe(III) oxides and hydroxides and Fe(III) (FeCl3), corresponding to the reduction in polarization resistance in the LP and EIS results.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140652972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The aim of this work is to study the effect of chitosan on mechanical and thermal properties of aloe vera fiber reinforced composites. In this work, we have fabricated the five different composites namely pure polyester composite (SP), pure aloe vera fiber composite (S0), 1 wt.% of chitosan filled aloe vera fiber composite (S1), 3 wt.% of chitosan filled aloe vera fiber composite (S3), and 5 wt.% of chitosan filled aloe vera fiber composite (S5) through simple hand layup method and investigated the mechanical and thermal properties. From the results, it is concluded that, 3 wt.% of chitosan filled aloe vera fiber reinforced composite was performed well in all the testing and it is suitable for various engineering applications such as automobile, aeronautical and marine. SEM analysis shows good adhesion behavior between fiber and matrix with the addition of chitosan. Further, 3 wt.% of chitosan can be added in natural fiber based polymer composites to enhance mechanical properties of the composites.
{"title":"Effect of chitosan on mechanical and thermal properties of novel aloe vera fiber reinforced composites","authors":"Anbumalar Veerabathiran, Ramakrishnan Palanichamy, Karthick Rasu","doi":"10.1515/mt-2023-0283","DOIUrl":"https://doi.org/10.1515/mt-2023-0283","url":null,"abstract":"\u0000 The aim of this work is to study the effect of chitosan on mechanical and thermal properties of aloe vera fiber reinforced composites. In this work, we have fabricated the five different composites namely pure polyester composite (SP), pure aloe vera fiber composite (S0), 1 wt.% of chitosan filled aloe vera fiber composite (S1), 3 wt.% of chitosan filled aloe vera fiber composite (S3), and 5 wt.% of chitosan filled aloe vera fiber composite (S5) through simple hand layup method and investigated the mechanical and thermal properties. From the results, it is concluded that, 3 wt.% of chitosan filled aloe vera fiber reinforced composite was performed well in all the testing and it is suitable for various engineering applications such as automobile, aeronautical and marine. SEM analysis shows good adhesion behavior between fiber and matrix with the addition of chitosan. Further, 3 wt.% of chitosan can be added in natural fiber based polymer composites to enhance mechanical properties of the composites.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140655122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Quasi-unidirectional glass fiber non-crimp fabrics consist of a unidirectional main layer in the 0° direction stabilized by a backing layer in the 90° direction with a significantly lower amount of fibers. It is known that the backing layers impair the fatigue performance of respective reinforced plastics due to their orientation perpendicular to the main load direction. They act as damage initiators for the failure of the load-carrying unidirectional fibers. In the present work, the positive influence of the backing layers on the interlaminar fracture toughness energy – Mode I – G IC is demonstrated by tests in accordance with DIN EN 6033. The presence of backing fibers in the delamination plane can improve the G IC values by up to 43 %. Furthermore, results from evaluation according to DIN EN 6033 and ASTM D5528 are shown to have a good agreement, if the correction factor for large displacements recommended in the ASTM standard is not applied. If it is applied, however, there is a clear gap of up to 19 % between the two standards because the DIN simply does not provide a correction for large deflections.
准单向玻璃纤维非卷曲织物由 0° 方向上的单向主层和 90° 方向上的背层组成，背层的纤维量要少得多。众所周知，背衬层会损害增强塑料的疲劳性能，因为它们的取向与主载荷方向垂直。它们是承载负荷的单向纤维失效的损伤触发器。在本研究中，根据 DIN EN 6033 标准进行的测试证明了背衬层对层间断裂韧性能量（模式 I - G IC）的积极影响。在分层面上存在背衬纤维可将 G IC 值提高 43%。此外，根据 DIN EN 6033 和 ASTM D5528 标准进行的评估结果表明，如果不采用 ASTM 标准中建议的大位移校正系数，两者的一致性很好。但是，如果采用该修正系数，则两种标准之间的差距明显，最高可达 19%，因为 DIN 标准根本没有提供大位移修正系数。
{"title":"Influence of backing layers on the interlaminar fracture toughness energy – Mode I – of quasi-unidirectional GFRP","authors":"Simon Backens, Stefan Schmidt, W. Flügge","doi":"10.1515/mt-2024-0020","DOIUrl":"https://doi.org/10.1515/mt-2024-0020","url":null,"abstract":"\u0000 Quasi-unidirectional glass fiber non-crimp fabrics consist of a unidirectional main layer in the 0° direction stabilized by a backing layer in the 90° direction with a significantly lower amount of fibers. It is known that the backing layers impair the fatigue performance of respective reinforced plastics due to their orientation perpendicular to the main load direction. They act as damage initiators for the failure of the load-carrying unidirectional fibers. In the present work, the positive influence of the backing layers on the interlaminar fracture toughness energy – Mode I – G\u0000 IC is demonstrated by tests in accordance with DIN EN 6033. The presence of backing fibers in the delamination plane can improve the G\u0000 IC values by up to 43 %. Furthermore, results from evaluation according to DIN EN 6033 and ASTM D5528 are shown to have a good agreement, if the correction factor for large displacements recommended in the ASTM standard is not applied. If it is applied, however, there is a clear gap of up to 19 % between the two standards because the DIN simply does not provide a correction for large deflections.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140653992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vehicle lightening efforts, low fuel consumption and low CO2 emission have become an important target in the automotive industry without compromising safety and comfort. By reducing vehicle weights, fuel consumption and CO2 emissions are significantly reduced. In this context, the next generation steels are constantly being developed in terms of high strength, forming, weld ability, low cost in matters such as vehicle lightening and impact safety. In this study, side-impact performance of the next generation steels that can be used for the body B-Pillar part as part of vehicle lightening was examined. In finite element analysis, Usibor 1500, TWIP 980, TRIP 800, DP 1000 materials and three different metal sheet thicknesses (1.3–1.5–1.8 mm) were used for the B-Pillar part. All results obtained were compared in terms of energy absorption ability, formability, weld ability, cost and weight.
{"title":"New generation steels for light weight vehicle safety related applications","authors":"Emre Doruk, Süleyman Demir","doi":"10.1515/mt-2024-0052","DOIUrl":"https://doi.org/10.1515/mt-2024-0052","url":null,"abstract":"\u0000 Vehicle lightening efforts, low fuel consumption and low CO2 emission have become an important target in the automotive industry without compromising safety and comfort. By reducing vehicle weights, fuel consumption and CO2 emissions are significantly reduced. In this context, the next generation steels are constantly being developed in terms of high strength, forming, weld ability, low cost in matters such as vehicle lightening and impact safety. In this study, side-impact performance of the next generation steels that can be used for the body B-Pillar part as part of vehicle lightening was examined. In finite element analysis, Usibor 1500, TWIP 980, TRIP 800, DP 1000 materials and three different metal sheet thicknesses (1.3–1.5–1.8 mm) were used for the B-Pillar part. All results obtained were compared in terms of energy absorption ability, formability, weld ability, cost and weight.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140668696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. S. Hedia, Majid A. Almas, Hassan M. Attar, Faisal W. H. Al Thobiani, Mona A. Soliman, M.H. Hedia
Carbon nanotubes (CNTs) have garnered significant attention due to their extraordinary mechanical and other physical characteristics. This study demonstrates that incorporating a small number of carbon nanotubes, ranging from 0.1 to 0.9 wt.%, into a polymer, can effectively enhance its mechanical properties. In comparison to the pure polymer, the addition of −0.3 % carbon nanotubes resulted in a notable 24.1 % increase in tensile strength, a 4.4 % increase in compressive strength, a significant 319.5 % increase in the fatigue life cycle at 0.1 % carbon nanotubes, and a remarkable 43.0 % increase in fracture toughness at 0.3 wt.% carbon nanotubes.
{"title":"Mechanical behavior of carbon nanotubes reinforced polymer","authors":"H. S. Hedia, Majid A. Almas, Hassan M. Attar, Faisal W. H. Al Thobiani, Mona A. Soliman, M.H. Hedia","doi":"10.1515/mt-2023-0187","DOIUrl":"https://doi.org/10.1515/mt-2023-0187","url":null,"abstract":"\u0000 Carbon nanotubes (CNTs) have garnered significant attention due to their extraordinary mechanical and other physical characteristics. This study demonstrates that incorporating a small number of carbon nanotubes, ranging from 0.1 to 0.9 wt.%, into a polymer, can effectively enhance its mechanical properties. In comparison to the pure polymer, the addition of −0.3 % carbon nanotubes resulted in a notable 24.1 % increase in tensile strength, a 4.4 % increase in compressive strength, a significant 319.5 % increase in the fatigue life cycle at 0.1 % carbon nanotubes, and a remarkable 43.0 % increase in fracture toughness at 0.3 wt.% carbon nanotubes.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140682713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vahid Zakeri Mehrabad, Ali Doniavi, R. Arghavanian, Majid Kavanlouei
For the first time, bronze/SiC/mica hybrid composite has been manufactured using powder metallurgy method. Mixture – process variable design has been applied to design of experiments and optimization of the composite composition, as well as the production process variables (compaction pressure and sintering temperature) to attain superior corrosion resistance. This involved mixing different compositions of bronze, SiC, and mica powders, which were subsequently subjected to varied pressures and temperatures during the pressing and sintering stages, all in accordance with the experimental design plan. The microstructure, chemical composition, and elemental distribution of the samples were examined using scanning electron microscope equipped by energy dispersive X-ray analyzer, and an optical microscope. In order to study the corrosion resistance, potentiodynamic polarization test and electrochemical impedance spectroscopy were performed in 3.5 wt.% NaCl solution. The results revealed that co-incorporation of SiC and mica particles in Cu–10Sn bronze matrix increases the corrosion resistance, with a synergistic effect between these particles. The result of optimization process showed that the highest corrosion resistance could be achieved for the composite with the composition of Cu–10Sn/9.85SiC/0.67mica. This outcome was subsequently validated through experimental procedures.
首次采用粉末冶金法制造出青铜/碳化硅/云母混合复合材料。混合物-工艺变量设计被应用于实验设计，并优化了复合材料成分以及生产工艺变量（压实压力和烧结温度），以获得优异的耐腐蚀性能。这包括混合不同成分的青铜、碳化硅和云母粉，然后在压制和烧结阶段对其施加不同的压力和温度，所有这些都要按照实验设计计划进行。使用配备了能量色散 X 射线分析仪的扫描电子显微镜和光学显微镜对样品的微观结构、化学成分和元素分布进行了检测。为了研究耐腐蚀性，在 3.5 wt.% 的氯化钠溶液中进行了电位极化测试和电化学阻抗谱分析。结果表明，在 Cu-10Sn 青铜基体中共同掺入 SiC 和云母颗粒可提高耐腐蚀性，这些颗粒之间存在协同效应。优化过程的结果表明，Cu-10Sn/9.85SiC/0.67mica 组成的复合材料具有最高的耐腐蚀性。这一结果随后通过实验程序得到了验证。
{"title":"Corrosion resistance of powder metallurgy fabricated Cu–10Sn/SiC/mica hybrid composite","authors":"Vahid Zakeri Mehrabad, Ali Doniavi, R. Arghavanian, Majid Kavanlouei","doi":"10.1515/mt-2023-0386","DOIUrl":"https://doi.org/10.1515/mt-2023-0386","url":null,"abstract":"\u0000 For the first time, bronze/SiC/mica hybrid composite has been manufactured using powder metallurgy method. Mixture – process variable design has been applied to design of experiments and optimization of the composite composition, as well as the production process variables (compaction pressure and sintering temperature) to attain superior corrosion resistance. This involved mixing different compositions of bronze, SiC, and mica powders, which were subsequently subjected to varied pressures and temperatures during the pressing and sintering stages, all in accordance with the experimental design plan. The microstructure, chemical composition, and elemental distribution of the samples were examined using scanning electron microscope equipped by energy dispersive X-ray analyzer, and an optical microscope. In order to study the corrosion resistance, potentiodynamic polarization test and electrochemical impedance spectroscopy were performed in 3.5 wt.% NaCl solution. The results revealed that co-incorporation of SiC and mica particles in Cu–10Sn bronze matrix increases the corrosion resistance, with a synergistic effect between these particles. The result of optimization process showed that the highest corrosion resistance could be achieved for the composite with the composition of Cu–10Sn/9.85SiC/0.67mica. This outcome was subsequently validated through experimental procedures.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140731907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Epoxy resin-based composites find extensive applications across various industries due to their unique mechanical properties. They are commonly used in gas and petrochemical industries for pipes and fittings in transmission lines. The primary objective of this study is to investigate changes in the mechanical properties of epoxy resin-based composites under different environmental moisture conditions. To achieve this, epoxy resin with varying weight percentages of graphite additive (0, 5, 10, 15, and 25 wt%) was used. The water absorption characteristics of the specimens were assessed by immersing samples in potable water (PW), distilled water (DW), a 10 vol% alkaline solution (NaCl), and a 10 vol% acidic solution (HCl), following ASTM standards. Both dry and wet samples were examined for various mechanical strengths. The results indicate that, for all weight percentages of graphite additive, water absorption follows the increasing order: NaCl < PW < DW < HCl, as compared to the blank resin case. In terms of mechanical testing, increasing the weight percentage of graphite additive resulted in a 24 % decrease in Barcol hardness and a 39 % decrease in impact strength, while the hot deflection temperature (HDT) increased for 5 wt% and showed no significant effects for the other cases.
{"title":"Mechanical behavior of epoxy resin with graphite additive subjected to water absorption","authors":"M. A. Torabizadeh, Sattar Maleki","doi":"10.1515/mt-2023-0414","DOIUrl":"https://doi.org/10.1515/mt-2023-0414","url":null,"abstract":"\u0000 Epoxy resin-based composites find extensive applications across various industries due to their unique mechanical properties. They are commonly used in gas and petrochemical industries for pipes and fittings in transmission lines. The primary objective of this study is to investigate changes in the mechanical properties of epoxy resin-based composites under different environmental moisture conditions. To achieve this, epoxy resin with varying weight percentages of graphite additive (0, 5, 10, 15, and 25 wt%) was used. The water absorption characteristics of the specimens were assessed by immersing samples in potable water (PW), distilled water (DW), a 10 vol% alkaline solution (NaCl), and a 10 vol% acidic solution (HCl), following ASTM standards. Both dry and wet samples were examined for various mechanical strengths. The results indicate that, for all weight percentages of graphite additive, water absorption follows the increasing order: NaCl < PW < DW < HCl, as compared to the blank resin case. In terms of mechanical testing, increasing the weight percentage of graphite additive resulted in a 24 % decrease in Barcol hardness and a 39 % decrease in impact strength, while the hot deflection temperature (HDT) increased for 5 wt% and showed no significant effects for the other cases.","PeriodicalId":18231,"journal":{"name":"Materials Testing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140729236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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