Pub Date : 2022-01-01DOI: 10.1177/26349833221137602
Adane Dagnaw Gudayu, L. Steuernagel, D. Meiners
Plastics reinforced by natural fibers attract growing attention, particularly in the automotive industry. The properties and performance of these composites are usually determined before application. However, many mechanical tests of composite materials are destructive, expensive, time-consuming, and can cause operator fatigue. The objective of this research is to model the tensile properties of sisal fiber reinforced polyethylene terephthalate (PET) composites and compare the model outcomes with the results of experimental tests. For the experiment, PET was reinforced with 25% wt. of sisal fiber and composite samples were produced by compounding and injection molding processes. Modeling and simulation have also been carried out with ABAQUS/CAE software. The outputs on the tensile properties of the experiment and the model were statistically compared to see the accuracy of the model against the experimental results. The two-sample t-test indicates that, at 95% confidence interval, the mean differences for the stress, strain, and modulus for the experimental tests and the model results are not significantly different from zero. The research shows that the experiment can be effectively modeled with ABAQUS-based modeling and simulation techniques by linking with appropriate mathematical predictive models.
{"title":"The capability of ABAQUS/CAE to predict the tensile properties of sisal fiber reinforced polyethylene terephthalate composites","authors":"Adane Dagnaw Gudayu, L. Steuernagel, D. Meiners","doi":"10.1177/26349833221137602","DOIUrl":"https://doi.org/10.1177/26349833221137602","url":null,"abstract":"Plastics reinforced by natural fibers attract growing attention, particularly in the automotive industry. The properties and performance of these composites are usually determined before application. However, many mechanical tests of composite materials are destructive, expensive, time-consuming, and can cause operator fatigue. The objective of this research is to model the tensile properties of sisal fiber reinforced polyethylene terephthalate (PET) composites and compare the model outcomes with the results of experimental tests. For the experiment, PET was reinforced with 25% wt. of sisal fiber and composite samples were produced by compounding and injection molding processes. Modeling and simulation have also been carried out with ABAQUS/CAE software. The outputs on the tensile properties of the experiment and the model were statistically compared to see the accuracy of the model against the experimental results. The two-sample t-test indicates that, at 95% confidence interval, the mean differences for the stress, strain, and modulus for the experimental tests and the model results are not significantly different from zero. The research shows that the experiment can be effectively modeled with ABAQUS-based modeling and simulation techniques by linking with appropriate mathematical predictive models.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89915999","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: 10.1177/26349833221087275
H. Kallagunta, J. Tate
Alumina nanofibers at 0.25wt%, 0.5wt%, 0.75wt%, and 1wt% concentration were used to modify unsaturated polyester resin. Additionally, vinyl silane treated alumina nanofibers were used at the same concentrations and were compared to pristine alumina nanofibers. The SEM images showed a variation in the surface morphology when alumina nanofibers and the BET measurement showed surface area increase from 111 m2/g to 122 m2/g when nanofibers were treated with silane agent. The dispersion of alumina nanofibers into the host unsaturated polyester resin was successfully achieved by three roll mill dispersion. The TEM images showed good dispersion of alumina nanofibers in polyester resin. Although pristine nanofibers showed greater agglomeration at 1wt% concentration, the effect of agglomeration was reduced in the 1wt% concentration. The weight loss measurements from TGA showed that the thermal stability of nanocomposites increased with addition of nanofibers and the lower onset degradation temperature can be tailored to improve by a maximum of 5.5% for silane treated nanofiber. Viscosity and contact angle which are key factors affecting the processability has seen to be positively altered by silane treatment. Additional tensile, flexural, and Izod impact properties were evaluated for the nine material systems and the properties were summarized.
{"title":"Influence of surface functionalization of ceramic nanofibers on morphological, physical and mechanical properties of unsaturated polyester nanocomposites","authors":"H. Kallagunta, J. Tate","doi":"10.1177/26349833221087275","DOIUrl":"https://doi.org/10.1177/26349833221087275","url":null,"abstract":"Alumina nanofibers at 0.25wt%, 0.5wt%, 0.75wt%, and 1wt% concentration were used to modify unsaturated polyester resin. Additionally, vinyl silane treated alumina nanofibers were used at the same concentrations and were compared to pristine alumina nanofibers. The SEM images showed a variation in the surface morphology when alumina nanofibers and the BET measurement showed surface area increase from 111 m2/g to 122 m2/g when nanofibers were treated with silane agent. The dispersion of alumina nanofibers into the host unsaturated polyester resin was successfully achieved by three roll mill dispersion. The TEM images showed good dispersion of alumina nanofibers in polyester resin. Although pristine nanofibers showed greater agglomeration at 1wt% concentration, the effect of agglomeration was reduced in the 1wt% concentration. The weight loss measurements from TGA showed that the thermal stability of nanocomposites increased with addition of nanofibers and the lower onset degradation temperature can be tailored to improve by a maximum of 5.5% for silane treated nanofiber. Viscosity and contact angle which are key factors affecting the processability has seen to be positively altered by silane treatment. Additional tensile, flexural, and Izod impact properties were evaluated for the nine material systems and the properties were summarized.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81507937","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}
Continuous fiber additive manufacturing technology has developed rapidly in recent years, and pore has a great influence on the properties of composites. Through the optimization process of aramid fiber (AF) reinforced composite filament forming, the internal porosity of composites filament was reduced, and stable wire was provided for continuous fiber additive manufacturing. A mathematical model of 0° fiber orientation porosity was established, and the porosity of composites was measured by Micro-CT, and the correctness of the mathematical model was verified with the absolute error of 0.26%, and the relative error of 2.16%. The process parameters of printing speed, printing layer thickness, and printing spacing were designed by orthogonal experiment. The relationship between interlaminar shear properties and porosity of composites with 0° fiber orientation was studied.
{"title":"Study on porosity of aramid fiber reinforced composites prepared by additive manufacturing","authors":"Ailing Zou, Z. Shan, Shaozong Wang, Xiaojun Liu, Xueya Ma, Dongming Zou, X. Jiang","doi":"10.1177/26349833221121831","DOIUrl":"https://doi.org/10.1177/26349833221121831","url":null,"abstract":"Continuous fiber additive manufacturing technology has developed rapidly in recent years, and pore has a great influence on the properties of composites. Through the optimization process of aramid fiber (AF) reinforced composite filament forming, the internal porosity of composites filament was reduced, and stable wire was provided for continuous fiber additive manufacturing. A mathematical model of 0° fiber orientation porosity was established, and the porosity of composites was measured by Micro-CT, and the correctness of the mathematical model was verified with the absolute error of 0.26%, and the relative error of 2.16%. The process parameters of printing speed, printing layer thickness, and printing spacing were designed by orthogonal experiment. The relationship between interlaminar shear properties and porosity of composites with 0° fiber orientation was studied.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85129915","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}
Natural bamboo fibers (BFs), which were treated by silane coupling agents, reinforced epoxy resin (EP)–based composite were synthesized. Effects of the coupling agents on the chemical structures of the BFs were characterized by Fourier Transform Infrared Spectroscopy. The mechanical properties, such as tensile strength, flexural strength, impact strength, and hardness of the BFs/EP-based composites were improved significantly, which could be attributed to the excellent strengthening effect of the BFs. Simultaneously, experimental investigations on the thermal behaviors of the BFs/epoxy composites were also presented, indicating that the thermal decomposition temperature of the polymer materials was lowered but the flame retardancy was improved. The bamboo fiber breakage and fiber split were also observed on the impact fracture surface of the composites, which indicate energy dissipation during fiber debonding and pullout process. Moreover, the erosive wear tests have also been carried out to analyze the erosive wear properties of the natural bamboo fibers which modified the epoxy matrix composites. The results indicate that the erosive wear resistance of the EP-based composite was improved greatly when the natural bamboo fibers content was 15 wt.%.
{"title":"Improving mechanical, thermal, and erosive wear performance of natural bamboo fibers modified epoxy resin matrix composites","authors":"Haixia Hu, Jiang Liu, Zhiwei Liu, C. Li, Chengjun Wang, Xiangyang Chen, Yuzhe Shen","doi":"10.1177/26349833221143395","DOIUrl":"https://doi.org/10.1177/26349833221143395","url":null,"abstract":"Natural bamboo fibers (BFs), which were treated by silane coupling agents, reinforced epoxy resin (EP)–based composite were synthesized. Effects of the coupling agents on the chemical structures of the BFs were characterized by Fourier Transform Infrared Spectroscopy. The mechanical properties, such as tensile strength, flexural strength, impact strength, and hardness of the BFs/EP-based composites were improved significantly, which could be attributed to the excellent strengthening effect of the BFs. Simultaneously, experimental investigations on the thermal behaviors of the BFs/epoxy composites were also presented, indicating that the thermal decomposition temperature of the polymer materials was lowered but the flame retardancy was improved. The bamboo fiber breakage and fiber split were also observed on the impact fracture surface of the composites, which indicate energy dissipation during fiber debonding and pullout process. Moreover, the erosive wear tests have also been carried out to analyze the erosive wear properties of the natural bamboo fibers which modified the epoxy matrix composites. The results indicate that the erosive wear resistance of the EP-based composite was improved greatly when the natural bamboo fibers content was 15 wt.%.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84227094","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: 10.1177/26349833221145016
Phani Prasanthi Parvathaneni, V. V. V. Madhav, C. S. Chaitanya, Vallabhaneni Veda Spandana, K. Saxena, Sahil Garg, M. A. Zeleke
In the past ten years, as awareness of biodegradability has increased, so has the utilization of natural fiber-reinforced composites. Along with the material properties, dynamic responsiveness is also necessary for the efficient design of these natural reinforced composites. In the current work, elastic characteristics and interfacial stress are evaluated for natural fiber-reinforced composites utilizing micromechanics and finite element methods. Later, employing explicit dynamic analysis, the natural composite plate was examined under impact loading. The analytical results used to verify the finite element models at each stage show good agreement. To carry out the current study, natural fiber-reinforced composites like hemp, sisal and flax as well as hemp + sisal, sisal + flax and hemp + flax hybrid composites were evaluated for their elastic modulus in longitudinal, transverse, in-plane and out of plane directions as well as their major and minor Poisson’s ratio. By adjusting the impactor’s velocity from 2 m/s to 11 m/s, the deformation, stresses, internal energy and energy summary of the hybrid natural fiber-reinforced composite are calculated from the impact analysis. Based on all the findings, the performance of hemp fiber and hemp fiber-based hybrid composites is better than all other composites taken into consideration for the current work. This research is utilized to build composite materials that function effectively under gradual loading.
{"title":"Prediction of impact behaviour for natural fiber-reinforced composites using the finite element method","authors":"Phani Prasanthi Parvathaneni, V. V. V. Madhav, C. S. Chaitanya, Vallabhaneni Veda Spandana, K. Saxena, Sahil Garg, M. A. Zeleke","doi":"10.1177/26349833221145016","DOIUrl":"https://doi.org/10.1177/26349833221145016","url":null,"abstract":"In the past ten years, as awareness of biodegradability has increased, so has the utilization of natural fiber-reinforced composites. Along with the material properties, dynamic responsiveness is also necessary for the efficient design of these natural reinforced composites. In the current work, elastic characteristics and interfacial stress are evaluated for natural fiber-reinforced composites utilizing micromechanics and finite element methods. Later, employing explicit dynamic analysis, the natural composite plate was examined under impact loading. The analytical results used to verify the finite element models at each stage show good agreement. To carry out the current study, natural fiber-reinforced composites like hemp, sisal and flax as well as hemp + sisal, sisal + flax and hemp + flax hybrid composites were evaluated for their elastic modulus in longitudinal, transverse, in-plane and out of plane directions as well as their major and minor Poisson’s ratio. By adjusting the impactor’s velocity from 2 m/s to 11 m/s, the deformation, stresses, internal energy and energy summary of the hybrid natural fiber-reinforced composite are calculated from the impact analysis. Based on all the findings, the performance of hemp fiber and hemp fiber-based hybrid composites is better than all other composites taken into consideration for the current work. This research is utilized to build composite materials that function effectively under gradual loading.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75111067","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: 10.1177/26349833221087755
Zohreh Hadi, Neda Hekmat, Fariba Soltanolkottabi
In this research, nanocomposite films based on starch were developed with the addition of hydroxyapatite nanoparticles as a mineral filler. Hydroxyapatite was synthesized by a chemical method using calcium nitrate and diammonium hydrogen phosphate. Various concentrations of hydroxyapatite nanoparticles were mixed with starch, and the developed films were evaluated in terms of physical, mechanical, and morphological properties. The highest values of mechanical parameters (tensile strength and elongation at break) were determined for the starch/hydroxyapatite film at 15 wt.% hydroxyapatite nanoparticles concentration (3.03 MPa, 37.41%, respectively). As hydroxyapatite concentration was increased from 0 to 20 wt.%, the solubility in water of the films decreased, whereas the solubility in acid increased. The crystalline structure of hydroxyapatite decreased the transparency of film and increased transparency value. Thus, a biodegradable film could be obtained with the addition of hydroxyapatite as a reinforcement filler up to 15 wt.%. It could be developed as a sustainable alternative for packaging industry.
{"title":"Effect of hydroxyapatite on physical, mechanical, and morphological properties of starch-based bio-nanocomposite films","authors":"Zohreh Hadi, Neda Hekmat, Fariba Soltanolkottabi","doi":"10.1177/26349833221087755","DOIUrl":"https://doi.org/10.1177/26349833221087755","url":null,"abstract":"In this research, nanocomposite films based on starch were developed with the addition of hydroxyapatite nanoparticles as a mineral filler. Hydroxyapatite was synthesized by a chemical method using calcium nitrate and diammonium hydrogen phosphate. Various concentrations of hydroxyapatite nanoparticles were mixed with starch, and the developed films were evaluated in terms of physical, mechanical, and morphological properties. The highest values of mechanical parameters (tensile strength and elongation at break) were determined for the starch/hydroxyapatite film at 15 wt.% hydroxyapatite nanoparticles concentration (3.03 MPa, 37.41%, respectively). As hydroxyapatite concentration was increased from 0 to 20 wt.%, the solubility in water of the films decreased, whereas the solubility in acid increased. The crystalline structure of hydroxyapatite decreased the transparency of film and increased transparency value. Thus, a biodegradable film could be obtained with the addition of hydroxyapatite as a reinforcement filler up to 15 wt.%. It could be developed as a sustainable alternative for packaging industry.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78211080","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: 10.1177/26349833221109843
Cao Kaiwen, Wang Songyan, Xu Lianghua, Zhao Dongling, Tong Yuanjian
Aqueous graphene oxide (GO) dispersion was used to produce fibers by wet spinning technique. In situ growth of carbon nanotubes (CNTs) in the graphene fibers was realized by chemical vapor deposition (CVD) of the obtained graphene oxide GO fibers with a diameter about 30 μm using acetylene as precursor gas. Carbon nanotubes with diameters of 107 and 407 nm were found in the resulted graphene fiber (GF) with creation of active nucleation sites as reduction oxygen containing groups in the GO sheets during the CVD process. XPS and Raman spectroscopy results combined with SEM image confirmed the conversion of the GO fibers to the CNTs/GF.
{"title":"In situ growth of carbon nanotubes on graphene oxide fibers by thermal chemical vapor deposition","authors":"Cao Kaiwen, Wang Songyan, Xu Lianghua, Zhao Dongling, Tong Yuanjian","doi":"10.1177/26349833221109843","DOIUrl":"https://doi.org/10.1177/26349833221109843","url":null,"abstract":"Aqueous graphene oxide (GO) dispersion was used to produce fibers by wet spinning technique. In situ growth of carbon nanotubes (CNTs) in the graphene fibers was realized by chemical vapor deposition (CVD) of the obtained graphene oxide GO fibers with a diameter about 30 μm using acetylene as precursor gas. Carbon nanotubes with diameters of 107 and 407 nm were found in the resulted graphene fiber (GF) with creation of active nucleation sites as reduction oxygen containing groups in the GO sheets during the CVD process. XPS and Raman spectroscopy results combined with SEM image confirmed the conversion of the GO fibers to the CNTs/GF.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73355813","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: 10.1177/26349833221105523
Longquan Liu
The application of adhesive bonding technology in aircraft structures can reduce the total wight greatly, but the bonded joints are very sensitive to the possible manufacturing defects and damages during service operations, which makes them difficult to meet the damage tolerance requirements of the current transport airplane structures. In this study, the damage tolerance of composite-metal hybrid joints reinforced by multiple and penetrative thin pins was studied. The damage tolerance performance of the composite-metal joint is supposed to be enhanced by multiple through-the-thickness penetrative thin reinforcements in the bonding region, and the thin reinforcements were bonded together with both the composite and metallic joint plates. Both experimental tests and finite element simulations were conducted to investigate the effects of the through-the-thickness reinforcements on the damage tolerance performance of the joints with and without pre-fabricated disbond defects. Through the comparative analyses, it was found that the penetrative thin pins in the bonding region significantly improved the static load carrying capacity, the failure strain, the fracture energy, and the fatigue lives of the composite-metal bonded joints. Moreover, the reinforcements decreased the sensitivity of the bonded joints to the disbond defects in the bonding region. The damage tolerance performance of the composite-metal adhesively bonded joints was significantly increased by the through-the-thickness penetrative reinforcements and the enhancement mechanism was revealed by the combined analysis of test results and simulation results.
{"title":"A study of the damage tolerance of composite-metal hybrid joints reinforced by multiple and penetrative thin pins","authors":"Longquan Liu","doi":"10.1177/26349833221105523","DOIUrl":"https://doi.org/10.1177/26349833221105523","url":null,"abstract":"The application of adhesive bonding technology in aircraft structures can reduce the total wight greatly, but the bonded joints are very sensitive to the possible manufacturing defects and damages during service operations, which makes them difficult to meet the damage tolerance requirements of the current transport airplane structures. In this study, the damage tolerance of composite-metal hybrid joints reinforced by multiple and penetrative thin pins was studied. The damage tolerance performance of the composite-metal joint is supposed to be enhanced by multiple through-the-thickness penetrative thin reinforcements in the bonding region, and the thin reinforcements were bonded together with both the composite and metallic joint plates. Both experimental tests and finite element simulations were conducted to investigate the effects of the through-the-thickness reinforcements on the damage tolerance performance of the joints with and without pre-fabricated disbond defects. Through the comparative analyses, it was found that the penetrative thin pins in the bonding region significantly improved the static load carrying capacity, the failure strain, the fracture energy, and the fatigue lives of the composite-metal bonded joints. Moreover, the reinforcements decreased the sensitivity of the bonded joints to the disbond defects in the bonding region. The damage tolerance performance of the composite-metal adhesively bonded joints was significantly increased by the through-the-thickness penetrative reinforcements and the enhancement mechanism was revealed by the combined analysis of test results and simulation results.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73282814","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: 10.1177/26349833221102471
Sarah Kadhim, M. Özakça
Basalt Fiber Reinforced Polymer (BFRP) is an environment friendly strengthening material that can be used in several engineering applications. In this research, an experimental program was directed to investigate the BFRP strengthening adequacy of reinforced concrete beams. Eight simple-span beams were tested under the four-point bending test and were all made from the same concrete mixture. One layer of BFRP was applied on the soffit of B1, while this layer was wrapped partially along the sides of beams B2, B3, and B4 with vertical side extensions of 25, 75, and 105 mm, respectively, to evaluate the effect of vertical extension of the bottom BFRP layer on the flexural behavior of the strengthened beams. The beams B5 and B6 were strengthened with three BFRP U-strips along the flexural span without and with a bottom layer of BFRP sheet, respectively. On the other hand, the bottom and side surfaces of B7 were fully wrapped with a layer of BFRP, while B0 was kept without strengthening as a reference beam. The test results showed that strengthening with BFRP can noticeably improve the beam load capacity at cracking, yield, and ultimate stages. The ductility of strengthened beams was less than B0 by up to 33% for partial side strengthening and 45% for full side strengthening, while the toughness of all strengthened beams was higher than that of reference beam by 8–78%. The results also showed that increasing the vertical side extension of the bottom BFRP layer leads to significant load capacity increase.
{"title":"Flexural performance of RC beams externally strengthened with a single-layer of basalt fiber reinforced polymer sheets","authors":"Sarah Kadhim, M. Özakça","doi":"10.1177/26349833221102471","DOIUrl":"https://doi.org/10.1177/26349833221102471","url":null,"abstract":"Basalt Fiber Reinforced Polymer (BFRP) is an environment friendly strengthening material that can be used in several engineering applications. In this research, an experimental program was directed to investigate the BFRP strengthening adequacy of reinforced concrete beams. Eight simple-span beams were tested under the four-point bending test and were all made from the same concrete mixture. One layer of BFRP was applied on the soffit of B1, while this layer was wrapped partially along the sides of beams B2, B3, and B4 with vertical side extensions of 25, 75, and 105 mm, respectively, to evaluate the effect of vertical extension of the bottom BFRP layer on the flexural behavior of the strengthened beams. The beams B5 and B6 were strengthened with three BFRP U-strips along the flexural span without and with a bottom layer of BFRP sheet, respectively. On the other hand, the bottom and side surfaces of B7 were fully wrapped with a layer of BFRP, while B0 was kept without strengthening as a reference beam. The test results showed that strengthening with BFRP can noticeably improve the beam load capacity at cracking, yield, and ultimate stages. The ductility of strengthened beams was less than B0 by up to 33% for partial side strengthening and 45% for full side strengthening, while the toughness of all strengthened beams was higher than that of reference beam by 8–78%. The results also showed that increasing the vertical side extension of the bottom BFRP layer leads to significant load capacity increase.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86596080","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: 10.1177/26349833221087752
Rois U Mahmud, Aminul Momin, Raijul Islam, A. Siddique, A. N. Khan
Composites with regenerated fiber bonded with natural fibers have attracted growing attention as the globe becomes more sustainable, ecofriendly, and environment-friendly. Pineapple leaf fiber is used for composite in this study since it is also handled as waste nowadays. Furthermore, viscose was chosen as a study variant since no one had ever tried a pineapple and viscose mixed composite before. Due to a scarcity of natural fiber production on Earth, regenerated cellulosic fiber reinforced with natural fiber is widely employed, providing a nearly identical experience by employing partial or less natural fiber. This paper describes a study that used pineapple leaf fiber mixed with a viscose composite and reinforced with epoxy resin. Pineapple viscose blended composite is composed of 1/1 plain wave design, and epoxy resin is applied on them to make stability by the compression molding process. The tested Tensile Strength (σ), Young’s Modulus, and Eb% are 20.7 Mpa, 579 Mpa, and 9.4%, respectively. Some testing is also carried out to differentiate the properties like bending strength 23.5 Mpa, bending modulus 717.6 Mpa, and avg. The pH of the composite is 9.54. This article has different analytical parts to acknowledge the actual condition of composite behaviors. Finally, some suggestions are made as to where it may be utilized and where appropriate to use it, such as on building sites, in Geotextile materials, Coffee cups, coffee cans, and agro-textile materials.
{"title":"Investigation of mechanical properties of pineapple-viscose blended fabric reinforced composite","authors":"Rois U Mahmud, Aminul Momin, Raijul Islam, A. Siddique, A. N. Khan","doi":"10.1177/26349833221087752","DOIUrl":"https://doi.org/10.1177/26349833221087752","url":null,"abstract":"Composites with regenerated fiber bonded with natural fibers have attracted growing attention as the globe becomes more sustainable, ecofriendly, and environment-friendly. Pineapple leaf fiber is used for composite in this study since it is also handled as waste nowadays. Furthermore, viscose was chosen as a study variant since no one had ever tried a pineapple and viscose mixed composite before. Due to a scarcity of natural fiber production on Earth, regenerated cellulosic fiber reinforced with natural fiber is widely employed, providing a nearly identical experience by employing partial or less natural fiber. This paper describes a study that used pineapple leaf fiber mixed with a viscose composite and reinforced with epoxy resin. Pineapple viscose blended composite is composed of 1/1 plain wave design, and epoxy resin is applied on them to make stability by the compression molding process. The tested Tensile Strength (σ), Young’s Modulus, and Eb% are 20.7 Mpa, 579 Mpa, and 9.4%, respectively. Some testing is also carried out to differentiate the properties like bending strength 23.5 Mpa, bending modulus 717.6 Mpa, and avg. The pH of the composite is 9.54. This article has different analytical parts to acknowledge the actual condition of composite behaviors. Finally, some suggestions are made as to where it may be utilized and where appropriate to use it, such as on building sites, in Geotextile materials, Coffee cups, coffee cans, and agro-textile materials.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89799799","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：