G. Belforte, M. Conte, A. Manuello, L. Mazza, T. Raparelli, C. Visconte
This work relates to the experimental evaluation of contact pressure at the interface between an elastomeric rod seal for pneumatic cylinders and its metallic counterpart, without interposing any intrusive measuring device. Results were obtained using a suitable test bench able to detect the radial force exerted by the rod seal, displaced at constant velocity on a sensorized portion of a cylinder rod over time. Pressure load was applied on the seal to reproduce actual working conditions. A data postprocessing methodology was developed for an indirect evaluation of contact pressure, starting from the experimental data set of the radial force exerted by the seal on the rod. At first, the measured radial force signal was filtered and properly fitted, obtaining a differentiable function; then, contact pressure distribution was computed as a function of the radial force time derivative, seal velocity and rod diameter. The experimental test bench and the computational methodology described can be applied to pneumatic rod seals with geometries and materials other than that described in this study.
{"title":"Determination of contact pressure at pneumatic seal/rod interface from radial force measurement","authors":"G. Belforte, M. Conte, A. Manuello, L. Mazza, T. Raparelli, C. Visconte","doi":"10.2495/MC170161","DOIUrl":"https://doi.org/10.2495/MC170161","url":null,"abstract":"This work relates to the experimental evaluation of contact pressure at the interface between an elastomeric rod seal for pneumatic cylinders and its metallic counterpart, without interposing any intrusive measuring device. Results were obtained using a suitable test bench able to detect the radial force exerted by the rod seal, displaced at constant velocity on a sensorized portion of a cylinder rod over time. Pressure load was applied on the seal to reproduce actual working conditions. A data postprocessing methodology was developed for an indirect evaluation of contact pressure, starting from the experimental data set of the radial force exerted by the seal on the rod. At first, the measured radial force signal was filtered and properly fitted, obtaining a differentiable function; then, contact pressure distribution was computed as a function of the radial force time derivative, seal velocity and rod diameter. The experimental test bench and the computational methodology described can be applied to pneumatic rod seals with geometries and materials other than that described in this study.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"23 1","pages":"161-168"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91350006","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}
The creep rupture properties of a water-absorbed green composite were examined and assessed for long-term safety. Plain woven jute fiber cloth was used as a reinforcement and a poly-lactic acid (PLA) resin sheet was used as a matrix. A water-absorption test of this green composite was conducted at room temperature, for 24 hours: The water absorption rate at 24 hours was 8%. Quasistatic tensile tests of water-absorbed green composites were conducted at a crosshead speed 0.1, 1.0 and 10 mm/min; as well as on non-water-treated control material. Tensile creep tests of the nonwater-treated and 8% water-absorbed green composites were conducted. The environmental temperature was room temperature. The maximum test time was 100 hours. We found that Young’s modulus and tensile strength of the non-water-treated and the 8% water-absorbed green composite increased with an increase in the strain rates. Young’s modulus and tensile strength of the 8% waterabsorbed green composite were lower than those of the non-water-absorbed green composite, under all strain rates. Creep rupture strengths of the non-water-absorbed and the 8% water-absorbed green composites decreased with an increase of loading time. The creep rupture life of the 8% waterabsorbed green composite was lower than that of the non-water absorbed green composite. Generally, the glass transition temperature of PLA resin was decreased by water absorption; therefore, the creep rupture property of the green composite studied was mainly affected, due to a decrease of the viscoelasticity of the matrix by water absorption.
{"title":"CREEP RUPTURE OF WATER-ABSORBED GREEN COMPOSITE","authors":"H. Katogi, K. Takemura","doi":"10.2495/MC170291","DOIUrl":"https://doi.org/10.2495/MC170291","url":null,"abstract":"The creep rupture properties of a water-absorbed green composite were examined and assessed for long-term safety. Plain woven jute fiber cloth was used as a reinforcement and a poly-lactic acid (PLA) resin sheet was used as a matrix. A water-absorption test of this green composite was conducted at room temperature, for 24 hours: The water absorption rate at 24 hours was 8%. Quasistatic tensile tests of water-absorbed green composites were conducted at a crosshead speed 0.1, 1.0 and 10 mm/min; as well as on non-water-treated control material. Tensile creep tests of the nonwater-treated and 8% water-absorbed green composites were conducted. The environmental temperature was room temperature. The maximum test time was 100 hours. We found that Young’s modulus and tensile strength of the non-water-treated and the 8% water-absorbed green composite increased with an increase in the strain rates. Young’s modulus and tensile strength of the 8% waterabsorbed green composite were lower than those of the non-water-absorbed green composite, under all strain rates. Creep rupture strengths of the non-water-absorbed and the 8% water-absorbed green composites decreased with an increase of loading time. The creep rupture life of the 8% waterabsorbed green composite was lower than that of the non-water absorbed green composite. Generally, the glass transition temperature of PLA resin was decreased by water absorption; therefore, the creep rupture property of the green composite studied was mainly affected, due to a decrease of the viscoelasticity of the matrix by water absorption.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"39 1","pages":"281-288"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86908726","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}
This paper presents a new functional-computational model for metal-matrix composites (MMC), specifically for coatings with coarse spherical WC-Co reinforcement. We have developed, simulated and optimized the model based on previous classical approximations. The experimental data to validate this model are the laboratory tribotest-abrasion measurements and complementary appropriate numerical reports published internationally. Programming software was designed both with nonlinear optimization and curve-fitting subroutines. Results comprise the model construction from theory to computational validation on the laboratory statistical and numerical database. Additional simulations/optimization related to other models are also shown together with conceptual details of the next generation of functional models.
{"title":"A MATHEMATICAL MODEL FOR ABRASIVE EROSION WEAR IN COMPOSITE FE-BASED MATRIX WITH WC-CO REINFORCEMENT","authors":"F. Casesnoves, A. Surzhenkov","doi":"10.2495/MC170101","DOIUrl":"https://doi.org/10.2495/MC170101","url":null,"abstract":"This paper presents a new functional-computational model for metal-matrix composites (MMC), specifically for coatings with coarse spherical WC-Co reinforcement. We have developed, simulated and optimized the model based on previous classical approximations. The experimental data to validate this model are the laboratory tribotest-abrasion measurements and complementary appropriate numerical reports published internationally. Programming software was designed both with nonlinear optimization and curve-fitting subroutines. Results comprise the model construction from theory to computational validation on the laboratory statistical and numerical database. Additional simulations/optimization related to other models are also shown together with conceptual details of the next generation of functional models.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"262 1","pages":"99-111"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82976818","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}
Grain/phase boundaries contribute significantly to build up of residual stresses, owing to varied plastic/thermal response of different grain orientations or phases during thermomechanical treatment. Hence, accurate quantification of such local scale stress gradients in commercial components is important in understanding their mechanical performance. The current work introduces a correlative method utilizing Electron Back Scattered Diffraction and Focused Ion Beam-Digital Image slit milling methodology to accurately determine spatially resolved stress profiles in the vicinity of grain boundaries using commercially pure titanium as a model material. Measured local stress gradients were in good agreement with local misorientation values. The role of dislocation-grain boundary interactions on buildup of local stress gradients is elucidated. Stress profiles near grain boundaries initially display non Hall-Petch characteristics, followed by a typical Hall-Petch type variation of “one over square root of distance”. The observed trends allude to local stress relaxation mechanisms very close to the grain boundaries. The findings indicate that grain scale stress gradients can be significant in terms of playing a crucial role in macroscopic fatigue behavior.
{"title":"Experimental determination and theoretical analysis of local residual stress at grain scale","authors":"I. Basu, V. Ocelík, J. Hosson","doi":"10.2495/MC170011","DOIUrl":"https://doi.org/10.2495/MC170011","url":null,"abstract":"Grain/phase boundaries contribute significantly to build up of residual stresses, owing to varied plastic/thermal response of different grain orientations or phases during thermomechanical treatment. Hence, accurate quantification of such local scale stress gradients in commercial components is important in understanding their mechanical performance. The current work introduces a correlative method utilizing Electron Back Scattered Diffraction and Focused Ion Beam-Digital Image slit milling methodology to accurately determine spatially resolved stress profiles in the vicinity of grain boundaries using commercially pure titanium as a model material. Measured local stress gradients were in good agreement with local misorientation values. The role of dislocation-grain boundary interactions on buildup of local stress gradients is elucidated. Stress profiles near grain boundaries initially display non Hall-Petch characteristics, followed by a typical Hall-Petch type variation of “one over square root of distance”. The observed trends allude to local stress relaxation mechanisms very close to the grain boundaries. The findings indicate that grain scale stress gradients can be significant in terms of playing a crucial role in macroscopic fatigue behavior.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"72 1","pages":"3-14"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90616717","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}
Gear transmissions are central parts in mechanical drive trains, and therefore are present in many fields of mechanical engineering. Continuously increasing requirements in gear technology regarding high power density, low noise, weight and costs as well as small gearbox size, lead to growing demand of optimized gear designs. The calculation of load carrying capacity for the tooth root delivers an easy to apply methodology, but does not fully exploit the potential of creating extremely lightweight, yet strong enough gears. Therefore, methods are needed that enable exact predictions of load carrying capacity based on local strain and material properties. FE-based methods are capable of evaluating local stresses in the tooth root accurately. In combination with local material strength models such as the InclusionBased Weakest Link Model, accurate lifetime predictions of gears can be made. In this paper, a combinational approach of the FE-based tooth contact analysis, together with the Inclusion-Based Weakest Link Model, is presented. A helical gear set will be investigated based on gear geometry and measured material properties such as Vickers hardness, residual stresses and material defects. A new approach to determine the material defects via automated microsection analysis is presented. To determine the defect size inside of the gear material, breakage surfaces were analyzed and then statistically evaluated in past research activities at the Laboratory for Machine Tools and Production Engineering in Aachen. This method is time consuming, and necessitates the generation of gear breakages in tests before the actual simulation. The presented method allows for defect size determination by optical analysis of non-etched microsections of the gear material, and therefore an a-priori assessment of gear durability before actual tests have been conducted. To validate this method, practical load carrying capacity tests of the investigated gears are presented and compared to the simulation results.
{"title":"AUTOMATED DEFECT SIZE DETERMINATION FOR GEAR TOOTH ROOT BENDING STRENGTH SIMULATION","authors":"C. Brecher, Christoph Loepenhaus, J. Pollaschek","doi":"10.2495/MC170091","DOIUrl":"https://doi.org/10.2495/MC170091","url":null,"abstract":"Gear transmissions are central parts in mechanical drive trains, and therefore are present in many fields of mechanical engineering. Continuously increasing requirements in gear technology regarding high power density, low noise, weight and costs as well as small gearbox size, lead to growing demand of optimized gear designs. The calculation of load carrying capacity for the tooth root delivers an easy to apply methodology, but does not fully exploit the potential of creating extremely lightweight, yet strong enough gears. Therefore, methods are needed that enable exact predictions of load carrying capacity based on local strain and material properties. FE-based methods are capable of evaluating local stresses in the tooth root accurately. In combination with local material strength models such as the InclusionBased Weakest Link Model, accurate lifetime predictions of gears can be made. In this paper, a combinational approach of the FE-based tooth contact analysis, together with the Inclusion-Based Weakest Link Model, is presented. A helical gear set will be investigated based on gear geometry and measured material properties such as Vickers hardness, residual stresses and material defects. A new approach to determine the material defects via automated microsection analysis is presented. To determine the defect size inside of the gear material, breakage surfaces were analyzed and then statistically evaluated in past research activities at the Laboratory for Machine Tools and Production Engineering in Aachen. This method is time consuming, and necessitates the generation of gear breakages in tests before the actual simulation. The presented method allows for defect size determination by optical analysis of non-etched microsections of the gear material, and therefore an a-priori assessment of gear durability before actual tests have been conducted. To validate this method, practical load carrying capacity tests of the investigated gears are presented and compared to the simulation results.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"55 1","pages":"87-97"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91391470","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}
In recent years, due to the serious environmental issues, the development of the gasoline mileage improvement technology has become essential in the automotive industry. Weight-saving of the car body can contribute to improving the gasoline mileage. CFRP (Carbon Fiber Reinforced Plastics) are widely used as structural material for airplanes, various kinds of sports gear and premium automobiles because of their low density and high performance in mechanical properties. In CFRP, CFRTP (Carbon Fiber Reinforced Thermoplastics) are expected to be used for lightweight component parts because of their high recycling efficiency and high productivity. Accordingly, a high-efficiency machining method of CFRTP has been needed; however, CFRTP are known as difficult-to-machine materials. Delamination and huge burrs are major problems in CFRTP cutting. Although a circular saw that can be used at high speed is usually used as a cutting tool, the internal damage of CFRTP resulting from machining has not been clarified yet. In this study, in order to evaluate the influence of cutting speed on the internal damage of CFRTP cut by circular saw, the internal damage depth and the temperature of specimens during cutting process were measured. The internal damage occurred by circular saw processing and the internal damage depth were decreased in the case of fast cutting speed. The temperature of the specimen was increased in the case of slow cutting speed because of the longer contact time of the circular saw with the specimen.
{"title":"INTERNAL DAMAGE EVALUATION OF CFRTP CUT BY A CIRCULAR SAW","authors":"Kazuto Tanaka, T. Yamashiro, T. Katayama","doi":"10.2495/MC170361","DOIUrl":"https://doi.org/10.2495/MC170361","url":null,"abstract":"In recent years, due to the serious environmental issues, the development of the gasoline mileage improvement technology has become essential in the automotive industry. Weight-saving of the car body can contribute to improving the gasoline mileage. CFRP (Carbon Fiber Reinforced Plastics) are widely used as structural material for airplanes, various kinds of sports gear and premium automobiles because of their low density and high performance in mechanical properties. In CFRP, CFRTP (Carbon Fiber Reinforced Thermoplastics) are expected to be used for lightweight component parts because of their high recycling efficiency and high productivity. Accordingly, a high-efficiency machining method of CFRTP has been needed; however, CFRTP are known as difficult-to-machine materials. Delamination and huge burrs are major problems in CFRTP cutting. Although a circular saw that can be used at high speed is usually used as a cutting tool, the internal damage of CFRTP resulting from machining has not been clarified yet. In this study, in order to evaluate the influence of cutting speed on the internal damage of CFRTP cut by circular saw, the internal damage depth and the temperature of specimens during cutting process were measured. The internal damage occurred by circular saw processing and the internal damage depth were decreased in the case of fast cutting speed. The temperature of the specimen was increased in the case of slow cutting speed because of the longer contact time of the circular saw with the specimen.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"11 1","pages":"345-351"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81977274","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}
{"title":"INTERFACIAL SHEAR STRENGTH OF RESIN PARTICLES ADDED TO CARBON FIBER/MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE IN A HOT-WET ENVIRONMENT","authors":"H. Katogi, K. Takemura","doi":"10.2495/MC170311","DOIUrl":"https://doi.org/10.2495/MC170311","url":null,"abstract":"","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"55 1","pages":"299-307"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88956470","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}
V. Ocelík, U. Schepke, H. H. Rasoul, M. Cune, J. Hosson
Yttria-stabilized zirconia prepared by hot isostatic pressing represents attractive material for biomedical applications. In this work the degradation of yttria-stabilized zirconia dental implants abutments due to the tetragonal to monoclinic phase transformation after one year of clinical use was studied in detail. Microstructural characterization by Electron Back Scattering Diffraction was successfully applied. The amount and distribution of the monoclinic phase, the grain-size distribution and crystallographic orientations between tetragonal and monoclinic crystals in 3 mol.% yttria-stabilized polycrystalline zirconia were determined in two different types of abutments currently used in clinical practice. Clear crystallographic orientation relationship between parent tetragonal and daughter monoclinic phase was clearly observed. An important and novel conclusion is that no substantial bulk degradation of 3Y-TZP dental implant abutments was detected after 1 year of clinical use.
{"title":"Surface degradation of nanocrystalline zirconia dental implants","authors":"V. Ocelík, U. Schepke, H. H. Rasoul, M. Cune, J. Hosson","doi":"10.2495/MC170371","DOIUrl":"https://doi.org/10.2495/MC170371","url":null,"abstract":"Yttria-stabilized zirconia prepared by hot isostatic pressing represents attractive material for biomedical applications. In this work the degradation of yttria-stabilized zirconia dental implants abutments due to the tetragonal to monoclinic phase transformation after one year of clinical use was studied in detail. Microstructural characterization by Electron Back Scattering Diffraction was successfully applied. The amount and distribution of the monoclinic phase, the grain-size distribution and crystallographic orientations between tetragonal and monoclinic crystals in 3 mol.% yttria-stabilized polycrystalline zirconia were determined in two different types of abutments currently used in clinical practice. Clear crystallographic orientation relationship between parent tetragonal and daughter monoclinic phase was clearly observed. An important and novel conclusion is that no substantial bulk degradation of 3Y-TZP dental implant abutments was detected after 1 year of clinical use.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"14 5S","pages":"355-365"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91423542","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}
Recently cellulose nanofibers and their nanocomposites have attracted researchers’ interest, because the mechanical performances of the cellulose nanofiber are high enough to use as reinforcement in polymer nanocomposites; for example, tensile strength is 2–3 GPa. However actual mechanical properties of polymer nanocomposites (i.e. green nanocomposites) reinforced by the cellulose nanofiber are much lower than expected. There are several reasons for the poor mechanical properties; such as fiber orientation and matrix/fiber bonding. In this study, we intended to improve the mechanical properties of polymer nanocomposites by controlling the orientation of cellulose nanofiber. The fiber orientation control of the cellulose nanofiber was conducted by applying multiple mechanical stretching treatments. In order to get higher stretching strain, we used polyvinyl alcohol gel as a matrix polymer. The effectiveness of the fiber alignment control has been demonstrated by tensile tests, namely the tensile strength and Young’s modulus of the cellulose nanofiber-reinforced nanocomposites after stretching treatments were increased as compared with those of the untreated nanocomposites.
{"title":"STRUCTURAL MODIFICATION OF CELLULOSE NANOCOMPOSITES BY STRETCHING","authors":"H. Takagi, A. N. Nakagaito, Yuya Sakaguchi","doi":"10.2495/MC170251","DOIUrl":"https://doi.org/10.2495/MC170251","url":null,"abstract":"Recently cellulose nanofibers and their nanocomposites have attracted researchers’ interest, because the mechanical performances of the cellulose nanofiber are high enough to use as reinforcement in polymer nanocomposites; for example, tensile strength is 2–3 GPa. However actual mechanical properties of polymer nanocomposites (i.e. green nanocomposites) reinforced by the cellulose nanofiber are much lower than expected. There are several reasons for the poor mechanical properties; such as fiber orientation and matrix/fiber bonding. In this study, we intended to improve the mechanical properties of polymer nanocomposites by controlling the orientation of cellulose nanofiber. The fiber orientation control of the cellulose nanofiber was conducted by applying multiple mechanical stretching treatments. In order to get higher stretching strain, we used polyvinyl alcohol gel as a matrix polymer. The effectiveness of the fiber alignment control has been demonstrated by tensile tests, namely the tensile strength and Young’s modulus of the cellulose nanofiber-reinforced nanocomposites after stretching treatments were increased as compared with those of the untreated nanocomposites.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"93 1","pages":"251-256"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85647249","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}
Carbon Nanotube (CNT) grafted carbon fibers were used for the heating element of resistance welding, and the effect of CNT deposition time at deposition temperature of 600oC on the tensile lap-shear strength of resistance welded CFRTP was evaluated. The longer the deposition time became, the longer the length of CNT became. The highest tensile lap-shear strength was obtained when CNT grafted carbon fibers grafted at the deposition time of 30 minutes were used for the heating element of resistance welding because it is reported that fiber matrix interfacial properties of the carbon fiber was improved by CNT deposition to the surface of carbon fiber. In the case of the CNT grafted carbon fibers grafted at the deposition time of 60 minutes, lower tensile lap-shear strength was obtained because of the poor impregnation of the resin into the carbon fiber due to the excess CNT on the carbon fibers. The length of CNT should be controlled to obtain good mechanical properties.
{"title":"EFFECTS OF CARBON NANOTUBE DEPOSITION TIME TO CARBON FIBER ON TENSILE LAP-SHEAR STRENGTH OF RESISTANCE WELDED CFRTP","authors":"Kazuto Tanaka, Kazuhiro Aoto, T. Katayama","doi":"10.2495/MC170321","DOIUrl":"https://doi.org/10.2495/MC170321","url":null,"abstract":"Carbon Nanotube (CNT) grafted carbon fibers were used for the heating element of resistance welding, and the effect of CNT deposition time at deposition temperature of 600oC on the tensile lap-shear strength of resistance welded CFRTP was evaluated. The longer the deposition time became, the longer the length of CNT became. The highest tensile lap-shear strength was obtained when CNT grafted carbon fibers grafted at the deposition time of 30 minutes were used for the heating element of resistance welding because it is reported that fiber matrix interfacial properties of the carbon fiber was improved by CNT deposition to the surface of carbon fiber. In the case of the CNT grafted carbon fibers grafted at the deposition time of 60 minutes, lower tensile lap-shear strength was obtained because of the poor impregnation of the resin into the carbon fiber due to the excess CNT on the carbon fibers. The length of CNT should be controlled to obtain good mechanical properties.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"43 1","pages":"309-316"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74909704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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