In the present work, the microstructure deformation and synergetic damage evolution of a three-dimensional textile SiC/SiC ceramic-matrix composites under flexural loading, has been investigated by in situ digital image correlation at ambient temperatures. With the flexural loading increases, matrix cracking occurs on the tensile side initially, and the local stress concentration leads to matrix cracking, interlayer debonding and fiber breakage on the compressive side of materials. Different from traditional 2D braided composite, when matrix fracture occurs, a matrix crack propagates in matrix enrichment regions perpendicular to fiber tows, with local deflection near the fiber/matrix interface surfaces, its propagation is diffused into sinuous fractures, and finally present a H-shaped path feature. This processes dissipate strain energy, resulting in enhancing composites fracture toughness. By using continuum damage mechanics and thermodynamic framework with synergetic effects of microstructure, asymmetric tension and compression load on both sides of the material, the flexural loading-induced damage is characterized by the reduction of the macroscopic effective elastic modulus, and a synergetic damage evolution model is established, which reveals the relationship between energy release rate and elastic modulus degradation, and can be used to predict the flexural stress-strain curves of the 3D textile SiC/SiC composites, further to improve the design and assessment of new textile architecture with specific mechanical properties.
{"title":"A Quantitative Representation of Damage and Failure Response of 3D Textile SiC/SiC Ceramics Matrix Composites Subjected to Flexural Loading","authors":"Zhengmao Yang, Keji Pang, X. Lei, Qing Hu","doi":"10.1115/1.4056414","DOIUrl":"https://doi.org/10.1115/1.4056414","url":null,"abstract":"\u0000 In the present work, the microstructure deformation and synergetic damage evolution of a three-dimensional textile SiC/SiC ceramic-matrix composites under flexural loading, has been investigated by in situ digital image correlation at ambient temperatures. With the flexural loading increases, matrix cracking occurs on the tensile side initially, and the local stress concentration leads to matrix cracking, interlayer debonding and fiber breakage on the compressive side of materials. Different from traditional 2D braided composite, when matrix fracture occurs, a matrix crack propagates in matrix enrichment regions perpendicular to fiber tows, with local deflection near the fiber/matrix interface surfaces, its propagation is diffused into sinuous fractures, and finally present a H-shaped path feature. This processes dissipate strain energy, resulting in enhancing composites fracture toughness. By using continuum damage mechanics and thermodynamic framework with synergetic effects of microstructure, asymmetric tension and compression load on both sides of the material, the flexural loading-induced damage is characterized by the reduction of the macroscopic effective elastic modulus, and a synergetic damage evolution model is established, which reveals the relationship between energy release rate and elastic modulus degradation, and can be used to predict the flexural stress-strain curves of the 3D textile SiC/SiC composites, further to improve the design and assessment of new textile architecture with specific mechanical properties.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47230941","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 this paper, the first principle method based on density functional theory is adopted to establish the interface model of WC/WC-Co through the software Materials Studio (MS). On the basis of this interface structure, rare earth element Y is doped, and then the energy of WC/WC-Co before and after doping is calculated respectively. The electronic structure is analyzed, and the calculation results of the two structures are compared. Finally, the grain growth is simulated by cellular automata of MATLAB to verify our calculation and analysis results. The results show that the interfacial adhesion work increases and the interface structure is more stable after doping Y element. The interface energy decreases and plays a role in grain refinement.
{"title":"Research on Strengthening Mechanism of Rare Earth Cemented Carbide Tool Material","authors":"Zhaopeng Hao, Yuan-gen Qiu, Yihang Fan","doi":"10.1115/1.4056278","DOIUrl":"https://doi.org/10.1115/1.4056278","url":null,"abstract":"\u0000 In this paper, the first principle method based on density functional theory is adopted to establish the interface model of WC/WC-Co through the software Materials Studio (MS). On the basis of this interface structure, rare earth element Y is doped, and then the energy of WC/WC-Co before and after doping is calculated respectively. The electronic structure is analyzed, and the calculation results of the two structures are compared. Finally, the grain growth is simulated by cellular automata of MATLAB to verify our calculation and analysis results. The results show that the interfacial adhesion work increases and the interface structure is more stable after doping Y element. The interface energy decreases and plays a role in grain refinement.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46752169","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}
When a unidirectional (UD) composite is subjected to transverse loading, different fibers are not stressed equally. In this paper, realizations of virtual random representative volume element (RVE) and experimental SEM images are translated into finite element models and the average stresses in each fiber are determined. The average stress in individual fibers is correlated with various geometric parameters like nearest neighbor distance, the angle(s) between the nearest neighbor and local fiber volume fraction. A very loose correlation with significant outliers is observed. For the matrix, the region with the highest fiber content does not necessarily lead to the highest matrix stress. The fibers with highest average stresses and the regions with highest matrix stresses are difficult to determine and cannot be simply correlated with geometric parameters.
{"title":"Influence of the Geometric Parameters on the Fiber Stresses in Unidirectional Composites Subject to Transverse Loading","authors":"Challa Geetha Krishna, Yash Anup Vora, Ishan Manoj, Tushar M. Patle, Atul Jain","doi":"10.1115/1.4056179","DOIUrl":"https://doi.org/10.1115/1.4056179","url":null,"abstract":"When a unidirectional (UD) composite is subjected to transverse loading, different fibers are not stressed equally. In this paper, realizations of virtual random representative volume element (RVE) and experimental SEM images are translated into finite element models and the average stresses in each fiber are determined. The average stress in individual fibers is correlated with various geometric parameters like nearest neighbor distance, the angle(s) between the nearest neighbor and local fiber volume fraction. A very loose correlation with significant outliers is observed. For the matrix, the region with the highest fiber content does not necessarily lead to the highest matrix stress. The fibers with highest average stresses and the regions with highest matrix stresses are difficult to determine and cannot be simply correlated with geometric parameters.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44179823","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 effects of changing strain rate regime from quasi-static to medium on hydrogen susceptibility of aluminum (Al) 7075 were investigated by means of tensile tests. Strain rates were selected as 10−3 s−1 and 1 s−1 and tensile tests were conducted on both hydrogen uncharged and hydrogen charged specimens at room temperature. Electrochemical hydrogen charging method was utilized and diffusion length of hydrogen inside Al 7075 was modeled. Material characterizations were carried out by X-ray diffraction (XRD) and energy dispersive X-Ray spectroscopy (EDX) and microstructural observations of hydrogen uncharged and hydrogen charged specimens were performed by scanning electron microscope (SEM). As opposed to previous studies hydrogen embrittlement was more pronounced at high strain rate case. Moreover, hydrogen enhanced localized plasticity was the more dominant hydrogen embrittlement mechanism at slower strain rate but coexistence of hydrogen enhanced localized plasticity and hydrogen enhanced decohesion was observed at a medium strain rate. Overall, the current findings shed light on the complicated hydrogen embrittlement behavior of Al 7075 and constitute an efficient guideline for the usage of Al 7075 that can be subject to different strain rate loadings in service.
{"title":"The Effect of Strain Rate on the Hydrogen Embrittlement Susceptibility of Aluminum 7075","authors":"Mehmet Furkan Baltacioglu, B. Çetin, B. Bal","doi":"10.1115/1.4056158","DOIUrl":"https://doi.org/10.1115/1.4056158","url":null,"abstract":"\u0000 The effects of changing strain rate regime from quasi-static to medium on hydrogen susceptibility of aluminum (Al) 7075 were investigated by means of tensile tests. Strain rates were selected as 10−3 s−1 and 1 s−1 and tensile tests were conducted on both hydrogen uncharged and hydrogen charged specimens at room temperature. Electrochemical hydrogen charging method was utilized and diffusion length of hydrogen inside Al 7075 was modeled. Material characterizations were carried out by X-ray diffraction (XRD) and energy dispersive X-Ray spectroscopy (EDX) and microstructural observations of hydrogen uncharged and hydrogen charged specimens were performed by scanning electron microscope (SEM). As opposed to previous studies hydrogen embrittlement was more pronounced at high strain rate case. Moreover, hydrogen enhanced localized plasticity was the more dominant hydrogen embrittlement mechanism at slower strain rate but coexistence of hydrogen enhanced localized plasticity and hydrogen enhanced decohesion was observed at a medium strain rate. Overall, the current findings shed light on the complicated hydrogen embrittlement behavior of Al 7075 and constitute an efficient guideline for the usage of Al 7075 that can be subject to different strain rate loadings in service.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47289794","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}
Finite element (FE) methods have been extensively used to simulate the effects of material's microstructure during the machining processes. However, determination of the individual microstructure phase stress strain curves is experimentally intensive and difficult to measure. Furthermore, these curves were also affected by heat treatment processes, chemical composition, and the percentage of individual microstructure phases. The objective of this paper is to develop and validate the Micromechanical Adaptive Iteration Algorithm to calculate the individual ferrite and martensite plastic behavior for dual phase (DP) steel. This method requires a minimum of three experimental stress-strain curves from the same material with three different martensite volume fractions (Vm). Two of the stress-strain curves with different Vm is required to initialize the iteration algorithm to predict the individual plastic behavior of ferrite and martensite. The third stress strain curve was used to validate the plastic behavior of individual ferrite and martensite for the given DP steel. Following on from here, the proposed algorithm was validated with two different grades of DP steel with 0.088%C and 0.1%C. Validation results shows that the approach has consistent prediction capabilities and the maximum difference observed between predicted and experimental results was 6.5%. The simulated results also shows that the degree of strain partitioning between ferrite and martensite decreases with increasing volumetric fraction of martensite (Vm).
{"title":"A Unique Method to Determine Ferrite and Martensite Phase Stress Strain Curve for Manufacturing Process","authors":"Silvie M Tanu Halim, E. Ng","doi":"10.1115/1.4056033","DOIUrl":"https://doi.org/10.1115/1.4056033","url":null,"abstract":"\u0000 Finite element (FE) methods have been extensively used to simulate the effects of material's microstructure during the machining processes. However, determination of the individual microstructure phase stress strain curves is experimentally intensive and difficult to measure. Furthermore, these curves were also affected by heat treatment processes, chemical composition, and the percentage of individual microstructure phases. The objective of this paper is to develop and validate the Micromechanical Adaptive Iteration Algorithm to calculate the individual ferrite and martensite plastic behavior for dual phase (DP) steel. This method requires a minimum of three experimental stress-strain curves from the same material with three different martensite volume fractions (Vm). Two of the stress-strain curves with different Vm is required to initialize the iteration algorithm to predict the individual plastic behavior of ferrite and martensite. The third stress strain curve was used to validate the plastic behavior of individual ferrite and martensite for the given DP steel. Following on from here, the proposed algorithm was validated with two different grades of DP steel with 0.088%C and 0.1%C. Validation results shows that the approach has consistent prediction capabilities and the maximum difference observed between predicted and experimental results was 6.5%. The simulated results also shows that the degree of strain partitioning between ferrite and martensite decreases with increasing volumetric fraction of martensite (Vm).","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43832810","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}
Uses of functionally graded materials (FGMs) is increasing owing to recent development in manufacturing technologies. Large deflection of beams that made of nonlinearly elastic, Ludwick's type of material and also FGMs has received considerable critical attention during recent years. However, the precise effect of number of laminae on both vertical and horizontal deflection of the beam in the finite element analysis (FEA) are unknown. Here, we examined the large deflections of a cantilever beam that subjected various loading conditions and made of nonlinearly elastic, modified Ludwick's type of material using FEA. The direction dependent material properties in the functionally graded material and non-linearity from modified Ludwick law are combined in the analysis by using Marlow's material model. Our results show that gradient function and number of laminae have significant effect on stress distribution through the thickness and the both vertical and horizontal deflection of the beam.
{"title":"Large Deflections of Functionally Graded Non-Linearly Elastic Cantilever Beams","authors":"Ayhan Hacioglu, Adem Candaş, C. Baykara","doi":"10.1115/1.4056034","DOIUrl":"https://doi.org/10.1115/1.4056034","url":null,"abstract":"\u0000 Uses of functionally graded materials (FGMs) is increasing owing to recent development in manufacturing technologies. Large deflection of beams that made of nonlinearly elastic, Ludwick's type of material and also FGMs has received considerable critical attention during recent years. However, the precise effect of number of laminae on both vertical and horizontal deflection of the beam in the finite element analysis (FEA) are unknown. Here, we examined the large deflections of a cantilever beam that subjected various loading conditions and made of nonlinearly elastic, modified Ludwick's type of material using FEA. The direction dependent material properties in the functionally graded material and non-linearity from modified Ludwick law are combined in the analysis by using Marlow's material model. Our results show that gradient function and number of laminae have significant effect on stress distribution through the thickness and the both vertical and horizontal deflection of the beam.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41835540","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}
Ni50Ti50-xVx (x = 0,1,2,3 at. %) shape memory alloys were prepared by vacuum induction melting. They were homogenized and then hot rolled. CHNOS and XRD analyses were carried out on the alloys to find out the oxygen and carbon contents and the phases present in the alloys. Transformation temperatures, determined by differential scanning calorimetry indicate that addition of vanadium reduces the transformation temperatures. Corrosion studies were carried out in Hanks’ solution, while potentiodynamic polarization tests were done to calculate the rate of corrosion of the alloys. Two significant parameters were analyzed from Tafel graph, namely, corrosion rate and corrosion potential. A comparison of these properties of the alloys was also made with commercially pure titanium and binary NiTi alloys. Among the NiTiV alloys, Ni50Ti47V3 (at.%) alloy was found to undergo the least rate of corrosion. With increasing vanadium content, the rate of corrosion was found to decrease. SEM analysis of the corroded surface shows that pitting was the main mechanism of corrosion in these alloys. Results show that addition of V to NiTi has a positive effect on the corrosion properties of the alloys. Elaborate results are discussed in detail in the paper.
{"title":"Effect of Vanadium on the Microstructure, Transformation Temperatures and Corrosion Behaviour of NiTi Shape Memory Alloys","authors":"S. Sampath, Sampath Vedamanickam","doi":"10.1115/1.4055910","DOIUrl":"https://doi.org/10.1115/1.4055910","url":null,"abstract":"\u0000 Ni50Ti50-xVx (x = 0,1,2,3 at. %) shape memory alloys were prepared by vacuum induction melting. They were homogenized and then hot rolled. CHNOS and XRD analyses were carried out on the alloys to find out the oxygen and carbon contents and the phases present in the alloys. Transformation temperatures, determined by differential scanning calorimetry indicate that addition of vanadium reduces the transformation temperatures. Corrosion studies were carried out in Hanks’ solution, while potentiodynamic polarization tests were done to calculate the rate of corrosion of the alloys. Two significant parameters were analyzed from Tafel graph, namely, corrosion rate and corrosion potential. A comparison of these properties of the alloys was also made with commercially pure titanium and binary NiTi alloys. Among the NiTiV alloys, Ni50Ti47V3 (at.%) alloy was found to undergo the least rate of corrosion. With increasing vanadium content, the rate of corrosion was found to decrease. SEM analysis of the corroded surface shows that pitting was the main mechanism of corrosion in these alloys. Results show that addition of V to NiTi has a positive effect on the corrosion properties of the alloys. Elaborate results are discussed in detail in the paper.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43243529","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}
Seyed Mehrdad Yamani, S. Raja, Mohammad Ashraf Bin Ariffin, Mohammad Syahid Mohd Isa, M. Muhamad, M. F. Jamaludin, F. Yusof, Muhammad Khairi Faiz Bin Ahmad Hairuddin
Friction stir welding of a low carbon steel plate having thickness 0.5 mm was performed with preheating the base material to increase the joining performance. The rotational speed of the tool was set from 1500 to 2000 rpm with a constant travel speed of 15 mm/min and preheating temperatures of 50 to 150 °C. The tensile strength of 340 MPa was achieved for the preheated specimen compared to 310 MPa for the non-preheating specimen at the welding speed of 15 mm/min. Electron microscope images of the preheated joint revealed plasticised material flow and dynamic recrystallisation, which resulted in the grain refinement that had increased the joining strength. The weld thinning issue was almost eliminated in the preheated welded specimen. However, by increasing the preheat temperature further, the tensile strength decreases due to the formation of defects from excessive heat. The preheated sample fractured at the base metal, revealing a ductile fracture mode.
{"title":"Effects of Preheating on Microstructural and Mechanical Properties of Friction Stir Welded Thin Low Carbon Steel Joints","authors":"Seyed Mehrdad Yamani, S. Raja, Mohammad Ashraf Bin Ariffin, Mohammad Syahid Mohd Isa, M. Muhamad, M. F. Jamaludin, F. Yusof, Muhammad Khairi Faiz Bin Ahmad Hairuddin","doi":"10.1115/1.4055909","DOIUrl":"https://doi.org/10.1115/1.4055909","url":null,"abstract":"\u0000 Friction stir welding of a low carbon steel plate having thickness 0.5 mm was performed with preheating the base material to increase the joining performance. The rotational speed of the tool was set from 1500 to 2000 rpm with a constant travel speed of 15 mm/min and preheating temperatures of 50 to 150 °C. The tensile strength of 340 MPa was achieved for the preheated specimen compared to 310 MPa for the non-preheating specimen at the welding speed of 15 mm/min. Electron microscope images of the preheated joint revealed plasticised material flow and dynamic recrystallisation, which resulted in the grain refinement that had increased the joining strength. The weld thinning issue was almost eliminated in the preheated welded specimen. However, by increasing the preheat temperature further, the tensile strength decreases due to the formation of defects from excessive heat. The preheated sample fractured at the base metal, revealing a ductile fracture mode.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41410695","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}
{"title":"The Mechanism of Slip System Activation with Grain Rotation During Superplastic Forming","authors":"Junzhou Yang, J.J. Wu, Zhiguo Li, H. Xie, Zongcai Zhang, Mengyuan Wang","doi":"10.1115/1.4055779","DOIUrl":"https://doi.org/10.1115/1.4055779","url":null,"abstract":"\u0000 The activated slip system of Ti-6Al-4V alloy during the superplastic forming (SPF) was investigated by the in-grain misorientation axes analysis (IGMA), and the mechanisms of slip model activation have been discussed. Depending on the distribution of IGMA, one significant discovery from this study is that all the basal, prismatic, and pyramidal slip systems would be activated. Considering the effective slip models, Schmid factors, and the Euler angles together, it is suggested that the dominant slip systems not only desired the largest Schmid factors but strongly demand continuous Schmid factors among the adjacent grains. Meanwhile, the estimated critical resolved shear stress (CRSS) on basal<a> and prismatic<a> at the temperature of 920°C with the strain rate of 10−3/s is given. An original method of roughly estimating dominant slip models with Euler angles has been introduced, which predicts that grain rotation may change the slip model. Furthermore, Crystal Plasticity Finite Element Method (CPFEM) is employed to simulate the evolution of Euler angles, and the grain orientation presents the largest set of significant clusters around the (1 100) after deformation. Besides, the continuity of the Schmid factor assumption for the activated slip model has also been verified by CPFEM. In addition, the eigenvector corresponding to the eigenvalue λ1=1 of Euler angle rotation matrix is calculated to be aligned with the grain rotation axis, which can be applied to describe the grain rotation.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45132724","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}
César Pérez, Raúl Pech, Hugo Carrillo, Gabriela Uribe, Francis Aviles-Cetina
Carbon nanotube yarns (CNTYs) are porous hierarchical fibers which exhibit a strong property-structure relationship. The morphology and structure of dry-spun CNTYs are characterized and correlated with their quasi-static and dynamic mechanical properties. These characterizations include assessment of the CNTY homogeneity by means of Raman spectroscopy mapping, determination of linear density and porosity, atomic force microscopy, and dedicated measurements of the statistical distribution of the yarn's diameter. Tensile testing CNTY yields a specific strength of 0.21–0.34 N/tex, and a specific elastic modulus of 3.59–8.06 N/tex, depending on the gage length. While the strength is weakly sensitive to the gage length, the elastic modulus depends on the gage length. The importance of subtracting the machine compliance for determination of CNTY's elastic modulus is highlighted, since the error can reach up to 28%. Dynamic mechanical analysis shows that the CNTY is a stiff material with an extraordinary high damping ratio, which increases with temperature and reach ~0.6 at 60 °C. In addition, the CNTY presents a frequency-stiffening behavior in the 18–48 Hz range, with storage modulus and loss modulus which increase ~2.5 times and ~7 times, respectively, at 48 Hz.
{"title":"Thermo-Mechanical Properties of Carbon Nanotube Yarns with High Energy Dissipation Capabilities","authors":"César Pérez, Raúl Pech, Hugo Carrillo, Gabriela Uribe, Francis Aviles-Cetina","doi":"10.1115/1.4055540","DOIUrl":"https://doi.org/10.1115/1.4055540","url":null,"abstract":"\u0000 Carbon nanotube yarns (CNTYs) are porous hierarchical fibers which exhibit a strong property-structure relationship. The morphology and structure of dry-spun CNTYs are characterized and correlated with their quasi-static and dynamic mechanical properties. These characterizations include assessment of the CNTY homogeneity by means of Raman spectroscopy mapping, determination of linear density and porosity, atomic force microscopy, and dedicated measurements of the statistical distribution of the yarn's diameter. Tensile testing CNTY yields a specific strength of 0.21–0.34 N/tex, and a specific elastic modulus of 3.59–8.06 N/tex, depending on the gage length. While the strength is weakly sensitive to the gage length, the elastic modulus depends on the gage length. The importance of subtracting the machine compliance for determination of CNTY's elastic modulus is highlighted, since the error can reach up to 28%. Dynamic mechanical analysis shows that the CNTY is a stiff material with an extraordinary high damping ratio, which increases with temperature and reach ~0.6 at 60 °C. In addition, the CNTY presents a frequency-stiffening behavior in the 18–48 Hz range, with storage modulus and loss modulus which increase ~2.5 times and ~7 times, respectively, at 48 Hz.","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42181051","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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