A steady-state magnetic field-assisted laser welding test of 1-mm-thick automotive 22MnB5 and CP780 high-strength steel plates was carried out using a low-power fiber laser. The effects of different magnetic induction intensities on the microstructure and mechanical properties of welded joints were investigated under a heat input of 150 J/mm. When no magnetic field was applied, there was splashing on the welded joint surface, the width was wide and the main solid-state phase transitions in the weld center included ferrite transformation and bainite transformation. The application of a magnetic field resulted in an acceleration of the cooling rate of the molten pool due to the thermoelectric magnetic force. This, in turn, led to the predominance of the bainite transformation and martensite transformation as the primary solid-state phase transitions in the weld center. In a range of 5–25 mT, the welded joints were narrow, symmetrical, well-formed and free of defects such as splashing. The experiment proved that as the magnetic induction intensity increased, the laser energy became more concentrated. This led to an increase in the average hardness at the center of the weld, a gradual reduction of the softening in the heat-affected zone and an increase in both the yield strength and elongation of the welded joint. The optimal comprehensive mechanical properties of the welded joints were observed when B = 25 mT.
{"title":"EFFECT OF A MAGNETIC FIELD ON THE MICROSTRUCTURE AND PROPERTIES OF A 22MnB5-CP780 WELDED JOINT","authors":"Xiaoou Zhu, Zhanqi Liu, Nan Li","doi":"10.17222/mit.2023.858","DOIUrl":"https://doi.org/10.17222/mit.2023.858","url":null,"abstract":"A steady-state magnetic field-assisted laser welding test of 1-mm-thick automotive 22MnB5 and CP780 high-strength steel plates was carried out using a low-power fiber laser. The effects of different magnetic induction intensities on the microstructure and mechanical properties of welded joints were investigated under a heat input of 150 J/mm. When no magnetic field was applied, there was splashing on the welded joint surface, the width was wide and the main solid-state phase transitions in the weld center included ferrite transformation and bainite transformation. The application of a magnetic field resulted in an acceleration of the cooling rate of the molten pool due to the thermoelectric magnetic force. This, in turn, led to the predominance of the bainite transformation and martensite transformation as the primary solid-state phase transitions in the weld center. In a range of 5–25 mT, the welded joints were narrow, symmetrical, well-formed and free of defects such as splashing. The experiment proved that as the magnetic induction intensity increased, the laser energy became more concentrated. This led to an increase in the average hardness at the center of the weld, a gradual reduction of the softening in the heat-affected zone and an increase in both the yield strength and elongation of the welded joint. The optimal comprehensive mechanical properties of the welded joints were observed when B = 25 mT.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135744641","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}
None Anand Ronald B, Mohammed Riaz Khan K. N., Kishore G., Lokesh V., Mullaivananathan R. K.
Additive manufacturing is one of the sought-after methods for on-demand printing of customized parts. Although it has several advantages, namely design complexity, topologically optimized parts, tool-less and inventory-less manufacturing, etc., it also has challenges in terms of print parameter-dependent mechanical properties. The present paper studies the influence of the build orientation and angle on the tensile and flexural properties of fused-deposition-modelling (FDM) printed polylactic acid (PLA) samples. The samples are printed in different orientations including 0°, 15°, 30°, 45°, 60°, 75° and 90° with respect to the X- and Y-axis. From the tensile and flexural studies, we can infer that the orientation of the print plays a significant role, influencing the tensile and flexural properties. The X-axis build orientation and 75° build angle are preferred owing to better tensile and flexural properties compared to the other angles and Y-orientation.
{"title":"INFLUENCE OF THE BUILD AXIS AND ANGLE ON THE PROPERTIES OF 3D PRINTED PLA","authors":"None Anand Ronald B, Mohammed Riaz Khan K. N., Kishore G., Lokesh V., Mullaivananathan R. K.","doi":"10.17222/mit.2023.900","DOIUrl":"https://doi.org/10.17222/mit.2023.900","url":null,"abstract":"Additive manufacturing is one of the sought-after methods for on-demand printing of customized parts. Although it has several advantages, namely design complexity, topologically optimized parts, tool-less and inventory-less manufacturing, etc., it also has challenges in terms of print parameter-dependent mechanical properties. The present paper studies the influence of the build orientation and angle on the tensile and flexural properties of fused-deposition-modelling (FDM) printed polylactic acid (PLA) samples. The samples are printed in different orientations including 0°, 15°, 30°, 45°, 60°, 75° and 90° with respect to the X- and Y-axis. From the tensile and flexural studies, we can infer that the orientation of the print plays a significant role, influencing the tensile and flexural properties. The X-axis build orientation and 75° build angle are preferred owing to better tensile and flexural properties compared to the other angles and Y-orientation.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135744876","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 current work focuses on the influence of graphene nanoplatelets (GPs) on the mechanical and thermo-mechanical properties of unidirectional glass/epoxy (GE) composites. GE and GP-GE composites are fabricated using the hand lay-up method followed by compression molding. Different percentages of GPs used in the fabrication of GP-GE composites are (0.1, 0.3, 0.5, and 0.7) w/% by weight of the epoxy. Tests are conducted to experimentally evaluate the uniaxial compressive properties and the coefficient of linear thermal expansion (CLTE) in the direction of fibers. Tests are also conducted to study the thermo-mechanical properties such as storage modulus (E’) and loss modulus (E’’). The variation in the storage modulus and loss modulus is measured from 15 °C to 125 °C, using a dynamic mechanical analyzer (DMA) while the CLTE is measured using a dialatometer. The results indicate that the compressive as well as thermo-mechanical properties increase with the addition of GPs up to 0.5 % and then they decrease. The addition of GPs has no effect on the CLTE of the GE composites in the fiber direction.
{"title":"INFLUENCE OF GRAPHENE NANOPLATELETS ON MECHANICAL AND THERMO-MECHANICAL PROPRTIES OF GLASS/EPOXY COMPOSITES","authors":"Shabberhussain Shaik, Velmurugan R","doi":"10.17222/mit.2023.753","DOIUrl":"https://doi.org/10.17222/mit.2023.753","url":null,"abstract":"The current work focuses on the influence of graphene nanoplatelets (GPs) on the mechanical and thermo-mechanical properties of unidirectional glass/epoxy (GE) composites. GE and GP-GE composites are fabricated using the hand lay-up method followed by compression molding. Different percentages of GPs used in the fabrication of GP-GE composites are (0.1, 0.3, 0.5, and 0.7) w/% by weight of the epoxy. Tests are conducted to experimentally evaluate the uniaxial compressive properties and the coefficient of linear thermal expansion (CLTE) in the direction of fibers. Tests are also conducted to study the thermo-mechanical properties such as storage modulus (E’) and loss modulus (E’’). The variation in the storage modulus and loss modulus is measured from 15 °C to 125 °C, using a dynamic mechanical analyzer (DMA) while the CLTE is measured using a dialatometer. The results indicate that the compressive as well as thermo-mechanical properties increase with the addition of GPs up to 0.5 % and then they decrease. The addition of GPs has no effect on the CLTE of the GE composites in the fiber direction.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135744865","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}
R. Ciocoiu, R. Turcu, Nicolae Văleanu, Gabriel Dobri, A. Banu, I. Carstoc, Dura Horatiu
Five experimental alloys Ti-9Nb-8Zr-xTa-2Ag (x = 0, 5, 10, 15) were obtained and analyzed in the as-cast condition. The microstructure, corrosion behavior and surface free energy on the samples polished and corroded in artificial saliva were investigated. The microstructure is comprised of a mixture of α and β phase and the proportion of β phase increases with tantalum content increase. At 10 % Ta a drastic change in the microstructure was observed that severely altered the corrosion behavior, as the corrosion rate increased significantly beyond this point. The alloys are hydrophilic and corrosion tends to increase the surface free energy of the alloy with 15 % Ta that was mostly affected by the corrosion. The tantalum content increase affects directly the microstructure and indirectly the corrosion and surface wetting properties of the experimental alloys. Tantalum content increase affects directly the microstructure and indirectly the corrosion and surface wetting properties of the experimental alloys.
{"title":"CORROSION BEHAVIOR AND WETTING PROPERTIES OF CAST TNZT ALLOYS","authors":"R. Ciocoiu, R. Turcu, Nicolae Văleanu, Gabriel Dobri, A. Banu, I. Carstoc, Dura Horatiu","doi":"10.17222/mit.2023.887","DOIUrl":"https://doi.org/10.17222/mit.2023.887","url":null,"abstract":"Five experimental alloys Ti-9Nb-8Zr-xTa-2Ag (x = 0, 5, 10, 15) were obtained and analyzed in the as-cast condition. The microstructure, corrosion behavior and surface free energy on the samples polished and corroded in artificial saliva were investigated. The microstructure is comprised of a mixture of α and β phase and the proportion of β phase increases with tantalum content increase. At 10 % Ta a drastic change in the microstructure was observed that severely altered the corrosion behavior, as the corrosion rate increased significantly beyond this point. The alloys are hydrophilic and corrosion tends to increase the surface free energy of the alloy with 15 % Ta that was mostly affected by the corrosion. The tantalum content increase affects directly the microstructure and indirectly the corrosion and surface wetting properties of the experimental alloys. Tantalum content increase affects directly the microstructure and indirectly the corrosion and surface wetting properties of the experimental alloys.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88582704","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}
Hot-work tool steels are used in casting and hot-forming processes and are subjected to thermal, mechanical and chemical stresses that can cause damage to various parts of the tool. Therefore, knowledge of the interaction between tool steel and molten aluminium alloy is necessary to extend the life of the tool. The present work was carried out to predict the influence of temperature on the interaction kinetics between tool steel and molten aluminium. To investigate the effect of temperature on the dissolution rate of tool steel in molten aluminium and the rate of formation of interaction layers, DSC analysis was performed at two different temperatures, 670 °C and 700 °C, for 12 h. The results were corroborated and supported by a detailed microstructure analysis. It was found that very small temperature changes, in this case 30 °C, significantly affect the kinetics of the interaction layer’s formation between the tool steel H11 and molten aluminium Al99.7. All test methods show a pronounced influence of the test temperature. A significantly faster dissolution was observed in the DSC curve, with the slope of the curve being larger for the specimen tested at 700 °C, which was also confirmed by measurements of the thicknesses of the interaction layers. The thickness of the composite layer was almost the same in both cases, and the temperature has no effect on this layer. The types of interaction layers do not differ from each other.
{"title":"INFLUENCE OF TEMPERATURE ON THE INTERACTION KINETICS BETWEEN MOLTEN ALUMINIUM ALLOY AL99.7 AND TOOL STEEL H11","authors":"M. Vončina, A. Nagode, J. Medved, T. Balaško","doi":"10.17222/mit.2023.825","DOIUrl":"https://doi.org/10.17222/mit.2023.825","url":null,"abstract":"Hot-work tool steels are used in casting and hot-forming processes and are subjected to thermal, mechanical and chemical stresses that can cause damage to various parts of the tool. Therefore, knowledge of the interaction between tool steel and molten aluminium alloy is necessary to extend the life of the tool. The present work was carried out to predict the influence of temperature on the interaction kinetics between tool steel and molten aluminium. To investigate the effect of temperature on the dissolution rate of tool steel in molten aluminium and the rate of formation of interaction layers, DSC analysis was performed at two different temperatures, 670 °C and 700 °C, for 12 h. The results were corroborated and supported by a detailed microstructure analysis. \u0000It was found that very small temperature changes, in this case 30 °C, significantly affect the kinetics of the interaction layer’s formation between the tool steel H11 and molten aluminium Al99.7. All test methods show a pronounced influence of the test temperature. A significantly faster dissolution was observed in the DSC curve, with the slope of the curve being larger for the specimen tested at 700 °C, which was also confirmed by measurements of the thicknesses of the interaction layers. The thickness of the composite layer was almost the same in both cases, and the temperature has no effect on this layer. The types of interaction layers do not differ from each other.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"70 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78055894","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}
Hamid Mahan, S. Konovalov, K. Osintsev, I. Panchenko
In this study aluminum alloy 2024 was reinforced with different mass fractions (0 w/%, 2.5 w/%, 5 w/%, and 7.5 w/%) of titanium dioxide nanoparticles using the stir-casting method. The main objective was to study an effect of an addition of TiO2 nanoparticles on the microstructure and the mechanical properties of the 2024 aluminum alloy composite fabricated by stir casting. Scanning electron microscopy, energy-dispersive analysis, as well as X-ray diffraction analysis were implemented to characterize the microstructure, elemental and phase composition of the samples. The tensile and Vickers hardness tests were carried out to evaluate the mechanical properties. The results showed that the addition of 7.5 w/% TiO2 nanoparticles increases the ultimate tensile strength by 37 % and elongation by 71 % while decreases the hardness by 14 % comparing with the initial alloy. The highest hardness was demonstrated in the alloy with 5 w/% TiO2.
{"title":"THE INFLUENCE OF TiO2 NANOPARTICLES ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF AA2024 ALUMINIUM ALLOY","authors":"Hamid Mahan, S. Konovalov, K. Osintsev, I. Panchenko","doi":"10.17222/mit.2023.898","DOIUrl":"https://doi.org/10.17222/mit.2023.898","url":null,"abstract":"In this study aluminum alloy 2024 was reinforced with different mass fractions (0 w/%, 2.5 w/%, 5 w/%, and 7.5 w/%) of titanium dioxide nanoparticles using the stir-casting method. The main objective was to study an effect of an addition of TiO2 nanoparticles on the microstructure and the mechanical properties of the 2024 aluminum alloy composite fabricated by stir casting. Scanning electron microscopy, energy-dispersive analysis, as well as X-ray diffraction analysis were implemented to characterize the microstructure, elemental and phase composition of the samples. The tensile and Vickers hardness tests were carried out to evaluate the mechanical properties. The results showed that the addition of 7.5 w/% TiO2 nanoparticles increases the ultimate tensile strength by 37 % and elongation by 71 % while decreases the hardness by 14 % comparing with the initial alloy. The highest hardness was demonstrated in the alloy with 5 w/% TiO2.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"74 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72823703","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}
In order to explore the hot formability of 22MnB5, a hot-tensile test of 22MnB5 high-strength steel plate was carried out using a Gleeble-1500 hot-tensile-testing machine. The stress-strain curves at 850 °C to 950 °C and 0.01 s–1 to 10 s–1 were obtained. The results show that 22MnB5 has an obvious positive-strain-rate sensitivity, and its peak stress decreases with the increase of temperature. The mechanical constitutive equation of 22MnB5 was established by using the improved Johnson-Cook model, and the fitting value was compared with the experimental value. Based on the dynamic material model, the hot-processing map of 22MnB5 was established and analyzed. The hot-processing process was determined as follows: deformation temperature 880 °C to 930 °C, strain rate 0.01 s–1 to 1 s–1.
{"title":"HOT-DEFORMATION BEHAVIOR AND PROCESSING MAP OF 22MnB5 HIGH-STRENGTH STEEL","authors":"H. Ji, Y. Wen, G. Cui, Weichi Pei, W. Xiao","doi":"10.17222/mit.2023.874","DOIUrl":"https://doi.org/10.17222/mit.2023.874","url":null,"abstract":"In order to explore the hot formability of 22MnB5, a hot-tensile test of 22MnB5 high-strength steel plate was carried out using a Gleeble-1500 hot-tensile-testing machine. The stress-strain curves at 850 °C to 950 °C and 0.01 s–1 to 10 s–1 were obtained. The results show that 22MnB5 has an obvious positive-strain-rate sensitivity, and its peak stress decreases with the increase of temperature. The mechanical constitutive equation of 22MnB5 was established by using the improved Johnson-Cook model, and the fitting value was compared with the experimental value. Based on the dynamic material model, the hot-processing map of 22MnB5 was established and analyzed. The hot-processing process was determined as follows: deformation temperature 880 °C to 930 °C, strain rate 0.01 s–1 to 1 s–1.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"401 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75013997","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}
This study focused on analyzing the tribological properties of AISI H11-type hot-work tool steel and how these properties depend on the heat-treatment parameters. The investigation focuses on the abrasive wear resistance under different contact conditions and correlations between the mechanical properties and the wear resistance. The results of the experiments show the importance of proper austenitizing- and tempering-temperature selection, thus providing the optimal combination of tool hardness, strength, and toughness. The coefficient of friction under dry-sliding-contact conditions and abrasive wear mode was found to be largely independent of the heat-treatment conditions and more determined by the contact conditions, especially the load. On the other hand, hardness and strength are the dominant mechanical properties controlling the abrasive wear resistance of the hot-work tool steel.
{"title":"DRY-SLIDING WEAR RESISTANCE OF AISI H11-TYPE HOT-WORK TOOL STEEL","authors":"G. Puš, B. Žužek, A. Guštin, B. Podgornik","doi":"10.17222/mit.2023.880","DOIUrl":"https://doi.org/10.17222/mit.2023.880","url":null,"abstract":"This study focused on analyzing the tribological properties of AISI H11-type hot-work tool steel and how these properties depend on the heat-treatment parameters. The investigation focuses on the abrasive wear resistance under different contact conditions and correlations between the mechanical properties and the wear resistance. The results of the experiments show the importance of proper austenitizing- and tempering-temperature selection, thus providing the optimal combination of tool hardness, strength, and toughness. The coefficient of friction under dry-sliding-contact conditions and abrasive wear mode was found to be largely independent of the heat-treatment conditions and more determined by the contact conditions, especially the load. On the other hand, hardness and strength are the dominant mechanical properties controlling the abrasive wear resistance of the hot-work tool steel.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"10 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74427773","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 prosthetic knee is an important, functional, dynamic component of a transfemoral prosthesis. This paper details a step-by-step fabrication procedure for a passive polycentric knee using carbon-fabric-reinforced polymer in a sequential order. The Solidworks® 2022 software package was used for part modelling and assembling. The three-dimensional model developed was the base for planning, visual ideation, feasibility assessment and physical prototyping. The parts of the composite knee were manufactured using a vacuum-assisted resin-infusion method. The moulds for the infusion process were designed and developed by fused-deposition modelling. The experimental static structural testing was performed in accordance with the ISO 10328 standard to evaluate the structural strength of the prosthetic knee.
{"title":"POLYCENTRIC KNEE PROSTHESIS WITH CARBON FABRIC REINFORCED POLYMER: FABRICATION AND STRUCTURAL EVALUATION","authors":"A. Vasanthanathan, Amudhan K, J. Thilak","doi":"10.17222/mit.2023.881","DOIUrl":"https://doi.org/10.17222/mit.2023.881","url":null,"abstract":"A prosthetic knee is an important, functional, dynamic component of a transfemoral prosthesis. This paper details a step-by-step fabrication procedure for a passive polycentric knee using carbon-fabric-reinforced polymer in a sequential order. The Solidworks® 2022 software package was used for part modelling and assembling. The three-dimensional model developed was the base for planning, visual ideation, feasibility assessment and physical prototyping. The parts of the composite knee were manufactured using a vacuum-assisted resin-infusion method. The moulds for the infusion process were designed and developed by fused-deposition modelling. The experimental static structural testing was performed in accordance with the ISO 10328 standard to evaluate the structural strength of the prosthetic knee.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"30 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88495857","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}
In engineering, waste mud is often used as a filling material after a solidification treatment. Geogrids, being excellent geotechnical engineering materials, are often used for soil reinforcement. In this work, a pullout test that considered the influence of different waste-mud moisture contents and cement contents was conducted to investigate the interface characteristics of geogrid-solidified waste-mud-reinforced soil. Then, the relationship between the pullout force and displacement, and the variations in the cohesion, friction angle and quasifriction coefficient were analysed. The results showed that the pullout force-displacement curve represented a strain-softening pattern. With the increasing moisture content, the peak pullout force, interfacial cohesion and quasifriction coefficient decreased gradually, but the internal friction angle did not change substantially. With the increasing cement content, the peak pullout force, interfacial cohesion, internal friction angle and quasifriction coefficient increased gradually. The peak pullout force was linearly correlated with the change in the moisture content and logarithmically correlated with the change in the cement content. Compared with the moisture content, the reinforcement-soil interface was more affected by the cement content. This study provides guidelines for the mixture design of reinforced solidified waste mud.
{"title":"INFLUENCE OF CEMENT CONTENT AND MOISTURE CONTENT ON THE PULLOUT-INTERFACE PROPERTIES OF GEOGRID-SOLIDIFIED WASTE MUD","authors":"Jian Zhang, Xirui Wang, Jie Shen","doi":"10.17222/mit.2023.848","DOIUrl":"https://doi.org/10.17222/mit.2023.848","url":null,"abstract":"In engineering, waste mud is often used as a filling material after a solidification treatment. Geogrids, being excellent geotechnical engineering materials, are often used for soil reinforcement. In this work, a pullout test that considered the influence of different waste-mud moisture contents and cement contents was conducted to investigate the interface characteristics of geogrid-solidified waste-mud-reinforced soil. Then, the relationship between the pullout force and displacement, and the variations in the cohesion, friction angle and quasifriction coefficient were analysed. The results showed that the pullout force-displacement curve represented a strain-softening pattern. With the increasing moisture content, the peak pullout force, interfacial cohesion and quasifriction coefficient decreased gradually, but the internal friction angle did not change substantially. With the increasing cement content, the peak pullout force, interfacial cohesion, internal friction angle and quasifriction coefficient increased gradually. The peak pullout force was linearly correlated with the change in the moisture content and logarithmically correlated with the change in the cement content. Compared with the moisture content, the reinforcement-soil interface was more affected by the cement content. This study provides guidelines for the mixture design of reinforced solidified waste mud.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"10 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74334836","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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