Piezoelectric materials are widely used in electronic devices like sensors. In this study, a strip saturation zone model is provided for a transversely isotropic piezoelectric plate which is cut along three equal collinear impermeable cracks. The developed saturation zones are assumed to be subjected to the linearly varying electric displacement conditions. The problem is solved using Stroh formalism and the complex variable approach. Analytic closed-form expressions are obtained for fracture parameters including crack opening displacement, crack opening potential, and saturation zone length. A numerical study also presented showing the effect of linearly varying electric displacement on the saturation zone length.
{"title":"Mathematical modelling for multiple straight cracks in piezoelectric ceramics","authors":"Irshad Saifi, Naved Akhtar, Shehzad Hasan","doi":"10.3233/sfc-230010","DOIUrl":"https://doi.org/10.3233/sfc-230010","url":null,"abstract":"Piezoelectric materials are widely used in electronic devices like sensors. In this study, a strip saturation zone model is provided for a transversely isotropic piezoelectric plate which is cut along three equal collinear impermeable cracks. The developed saturation zones are assumed to be subjected to the linearly varying electric displacement conditions. The problem is solved using Stroh formalism and the complex variable approach. Analytic closed-form expressions are obtained for fracture parameters including crack opening displacement, crack opening potential, and saturation zone length. A numerical study also presented showing the effect of linearly varying electric displacement on the saturation zone length.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134971457","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}
Zhang Jie, Qinchao Li, Zhang Chuan, Liu Ming, Qiulin Tang, Dagang Wang
Blowout preventer reliability is important for safe drilling operation. In order to study the sealing mechanism and failure mechanism of conical blowout preventer, this paper establishes a numerical model of conical blowout preventer based on the theory of large deformation of rubber, and studies the deformation law, stress distribution and sealing performance of rubber core in well shut-in operation. The results show that there are stress concentrations in the contact area between the rubber core and the piston, the grooves in the middle of the adjacent support ribs, and the chamfered corner of the inner wall of the rubber core, the main form of failure at these locations is rubber cracking. Higher stress is present in the neck region of the upper plate and the back region of the lower plate of the support ribs. The inner wall surface of the rubber core gradually produces stripes of wrinkles, and the smaller the size of the sealed drill pipe, the more obvious the wrinkles are. When the drill pipe joint is sealed by the rubber core, there is a sealing buffer zone at the shoulder, and the contact pressure change abruptly. The lower portion of the rubber core’s inner wall serves as the primary sealing area. Increasing the piston displacement appropriately can enhance the sealing performance of the rubber core. The results of the study can provide a theoretical basis for the optimization design of the conical blowout preventer.
{"title":"Sealing performance and failure mechanism of rubber core for conical blowout preventer during the well shut-in process","authors":"Zhang Jie, Qinchao Li, Zhang Chuan, Liu Ming, Qiulin Tang, Dagang Wang","doi":"10.3233/sfc-230007","DOIUrl":"https://doi.org/10.3233/sfc-230007","url":null,"abstract":"Blowout preventer reliability is important for safe drilling operation. In order to study the sealing mechanism and failure mechanism of conical blowout preventer, this paper establishes a numerical model of conical blowout preventer based on the theory of large deformation of rubber, and studies the deformation law, stress distribution and sealing performance of rubber core in well shut-in operation. The results show that there are stress concentrations in the contact area between the rubber core and the piston, the grooves in the middle of the adjacent support ribs, and the chamfered corner of the inner wall of the rubber core, the main form of failure at these locations is rubber cracking. Higher stress is present in the neck region of the upper plate and the back region of the lower plate of the support ribs. The inner wall surface of the rubber core gradually produces stripes of wrinkles, and the smaller the size of the sealed drill pipe, the more obvious the wrinkles are. When the drill pipe joint is sealed by the rubber core, there is a sealing buffer zone at the shoulder, and the contact pressure change abruptly. The lower portion of the rubber core’s inner wall serves as the primary sealing area. Increasing the piston displacement appropriately can enhance the sealing performance of the rubber core. The results of the study can provide a theoretical basis for the optimization design of the conical blowout preventer.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42792439","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 this work, two reinforcements (natural jute fiber and glass fiber) hybridized with different volume fractions, are reinforced with a constant volume epoxy resin through hand layup method. The ASTM standard tensile specimen of jute natural epoxy composite of different volume fractions and orientations of fibers, with varied single edge notch (SEN) size were subjected to uniaxial tensile load in universal testing machine. Effect of jute volume fraction, notch size and fiber orientation on tensile strength and fracture toughness has been studied through experimental results. Increased percent of jute fibre showed decrease in tensile strength and fracture toughness. Also, with the increase in notch size, the tensile strength decreased and the fracture toughness increased. Further, the tensile strength and fracture toughness were superior in 0°/90° fiber orientation specimen than those with ±45° fiber orientation. Furthermore, experimental results were validated by conducting statistical and fractographic analysis. The jute fiber percentage was ranked as best level factor affecting the fracture behavior as per taguchi method. Morphological features of fractured surfaces were analyzed through scanning electron microscopic (SEM) images with respect to nature of jute fiber failure under uniaxial loading conditions.
{"title":"A study on fracture behavior of SEN natural hybrid composite specimen under tensile load","authors":"H. M. Harsha, K. Satish","doi":"10.3233/sfc-230005","DOIUrl":"https://doi.org/10.3233/sfc-230005","url":null,"abstract":"In this work, two reinforcements (natural jute fiber and glass fiber) hybridized with different volume fractions, are reinforced with a constant volume epoxy resin through hand layup method. The ASTM standard tensile specimen of jute natural epoxy composite of different volume fractions and orientations of fibers, with varied single edge notch (SEN) size were subjected to uniaxial tensile load in universal testing machine. Effect of jute volume fraction, notch size and fiber orientation on tensile strength and fracture toughness has been studied through experimental results. Increased percent of jute fibre showed decrease in tensile strength and fracture toughness. Also, with the increase in notch size, the tensile strength decreased and the fracture toughness increased. Further, the tensile strength and fracture toughness were superior in 0°/90° fiber orientation specimen than those with ±45° fiber orientation. Furthermore, experimental results were validated by conducting statistical and fractographic analysis. The jute fiber percentage was ranked as best level factor affecting the fracture behavior as per taguchi method. Morphological features of fractured surfaces were analyzed through scanning electron microscopic (SEM) images with respect to nature of jute fiber failure under uniaxial loading conditions.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48431726","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 Yen Doan, H. Pham, Khai Quang Le, Thi-Hang-Nga Nguyen, Vinh Van Nghiem
Although ductile fracture properties of aluminum alloy have been examined by several research works, the effect of strain rate in small punch test is still unclear. An investigation on rate sensitivity of fracture mechanical characteristics of aluminum alloy in small punch test is necessary. In the present study, an experimental investigation of small punch test is performed at different deformation rate in quasi-static test for aluminum alloy 1050-H14. The strain-rate sensitivity of fracture properties are discussed based on the force-deflection curve as well as observation of fracture surface of deformed specimen after testing. The obtained results show that the material possesses a positive rate-sensitivity in the investigated range of displacement rate from 0.48 to 1.26 mm/min. The necking appears in a small region due to inhomogeneous deformation in the direction of cross-section at lower deformation rate. In the case of higher rate of deformation, more uniform deformation in the direction of cross-section and the local ductile fracture with more dimples can be observed.
{"title":"Experimental evaluation of fracture properties of aluminum alloy 1050-H14 by small punch test","authors":"The Yen Doan, H. Pham, Khai Quang Le, Thi-Hang-Nga Nguyen, Vinh Van Nghiem","doi":"10.3233/sfc-230003","DOIUrl":"https://doi.org/10.3233/sfc-230003","url":null,"abstract":"Although ductile fracture properties of aluminum alloy have been examined by several research works, the effect of strain rate in small punch test is still unclear. An investigation on rate sensitivity of fracture mechanical characteristics of aluminum alloy in small punch test is necessary. In the present study, an experimental investigation of small punch test is performed at different deformation rate in quasi-static test for aluminum alloy 1050-H14. The strain-rate sensitivity of fracture properties are discussed based on the force-deflection curve as well as observation of fracture surface of deformed specimen after testing. The obtained results show that the material possesses a positive rate-sensitivity in the investigated range of displacement rate from 0.48 to 1.26 mm/min. The necking appears in a small region due to inhomogeneous deformation in the direction of cross-section at lower deformation rate. In the case of higher rate of deformation, more uniform deformation in the direction of cross-section and the local ductile fracture with more dimples can be observed.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47418829","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}
K. Fujimoto, Hiroyuki Fujiki, M. Daimaruya, H. Yamada
BACKGROUND: This study is concerned with the development of the hydrogen gas dispenser used in hydrogen stations for fuel cell vehicles (FCV). Most of the current flexible hoses suppling the high-pressure hydrogen gas to FCV are made of rubber and resin-based materials. They are required to have the characteristics of resistance to permeation of the gas and to inhibit the internal fractures known as blisters. If the materials can be replaced with metal materials, those difficulties may be resolved. OBJECTIVE: The relationship between the internal pressure strength of flexible metal tubes and their convolution shapes is investigated by experiments and computer-aided engineering (CAE) analyses. METHODS: Two kinds of stainless steels with high Ni equivalent are used for flexible tubing. The U-shaped bellows and the compressed bellows made by compressing them in the axial direction are fabricated, and then CAE analyses of their internal pressure strength are performed Internal pressure rupture tests are also carried out on both bellows. RESULTS: The internal pressure strength of the compressed bellows with a pitch of 1.6 mm was more than twice that of the U-shaped bellows with a pitch of 4.3 mm. CONCLUSION: It was found that the smaller the pitch of the bellows, the larger the internal pressure strength.
{"title":"Relationship between internal pressure strength of flexible metal tubes and bellows shapes","authors":"K. Fujimoto, Hiroyuki Fujiki, M. Daimaruya, H. Yamada","doi":"10.3233/sfc-232000","DOIUrl":"https://doi.org/10.3233/sfc-232000","url":null,"abstract":"BACKGROUND: This study is concerned with the development of the hydrogen gas dispenser used in hydrogen stations for fuel cell vehicles (FCV). Most of the current flexible hoses suppling the high-pressure hydrogen gas to FCV are made of rubber and resin-based materials. They are required to have the characteristics of resistance to permeation of the gas and to inhibit the internal fractures known as blisters. If the materials can be replaced with metal materials, those difficulties may be resolved. OBJECTIVE: The relationship between the internal pressure strength of flexible metal tubes and their convolution shapes is investigated by experiments and computer-aided engineering (CAE) analyses. METHODS: Two kinds of stainless steels with high Ni equivalent are used for flexible tubing. The U-shaped bellows and the compressed bellows made by compressing them in the axial direction are fabricated, and then CAE analyses of their internal pressure strength are performed Internal pressure rupture tests are also carried out on both bellows. RESULTS: The internal pressure strength of the compressed bellows with a pitch of 1.6 mm was more than twice that of the U-shaped bellows with a pitch of 4.3 mm. CONCLUSION: It was found that the smaller the pitch of the bellows, the larger the internal pressure strength.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42512079","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}
BACKGROUND: Structural integrity assessment of components containing cracks is of paramount importance when they are part of critical structures. In this context, the fracture behavior of components containing cracks is crucial. OBJECTIVE: To investigate the effect of the diameter, number and position of holes drilled in the vicinity of the centre crack in a finite plate on the mode I stress intensity factor (SIF). METHODS: A 2D model with central horizontal crack was created in ABAQUS® simulation software and validated with the analytical results after performing mesh convergence. Circular holes of different diameters and at different positions were then introduced in the vicinity of the crack. RESULTS: By increasing the diameter of the hole and its number, the SIF reduced significantly. An optimum amount of distance between the crack and the hole was found at which the SIF was minimum, beyond it increased and asymptotically approached that of the plate without holes. CONCLUSION: The diameter of the hole and the spcacing between the hole-centre and the crack axis has a major influence on the mode I SIF. By introducing multiple holes, the mode I SIF significantly reduced.
{"title":"Effect of a circular hole on the SIF of a plate with a center crack subjected to uniaxial loading","authors":"S. Arunkumar, V. Nithin","doi":"10.3233/sfc-220294","DOIUrl":"https://doi.org/10.3233/sfc-220294","url":null,"abstract":"BACKGROUND: Structural integrity assessment of components containing cracks is of paramount importance when they are part of critical structures. In this context, the fracture behavior of components containing cracks is crucial. OBJECTIVE: To investigate the effect of the diameter, number and position of holes drilled in the vicinity of the centre crack in a finite plate on the mode I stress intensity factor (SIF). METHODS: A 2D model with central horizontal crack was created in ABAQUS® simulation software and validated with the analytical results after performing mesh convergence. Circular holes of different diameters and at different positions were then introduced in the vicinity of the crack. RESULTS: By increasing the diameter of the hole and its number, the SIF reduced significantly. An optimum amount of distance between the crack and the hole was found at which the SIF was minimum, beyond it increased and asymptotically approached that of the plate without holes. CONCLUSION: The diameter of the hole and the spcacing between the hole-centre and the crack axis has a major influence on the mode I SIF. By introducing multiple holes, the mode I SIF significantly reduced.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49505328","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 order to investigate new crack generation in thermally tempered glass, crack propagation and crack divergence were observed using Cranz-Schardin high speed camera. Tempered glass of 3.5 mm thick was used as a specimen. Generation of cracks due to two crack-collision was also observed in 3.5 mm tempered glass, as well as those observed by Caustics method in 10 mm thick tempered glass. Regarding the presence/absence of new cracks the dependence of two cracks on the collision angle was confirmed. Considering that it is based on the synthesis of stress 𝜎CR generated at the crack tip, tensile stress necessary for the new crack generation could be created.
{"title":"New crack generation due to two-crack collision in 3.5 mm thick tempered glass","authors":"S. Aratani","doi":"10.3233/sfc-230001","DOIUrl":"https://doi.org/10.3233/sfc-230001","url":null,"abstract":"In order to investigate new crack generation in thermally tempered glass, crack propagation and crack divergence were observed using Cranz-Schardin high speed camera. Tempered glass of 3.5 mm thick was used as a specimen. Generation of cracks due to two crack-collision was also observed in 3.5 mm tempered glass, as well as those observed by Caustics method in 10 mm thick tempered glass. Regarding the presence/absence of new cracks the dependence of two cracks on the collision angle was confirmed. Considering that it is based on the synthesis of stress 𝜎CR generated at the crack tip, tensile stress necessary for the new crack generation could be created.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45775022","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}
Brittle materials such as ceramics are subject to fracture without warning. Because non-destructive techniques are unreliable for determining potential fracture sources in ceramic materials one must rely on statistical analysis of laboratory strength data. This data is used to determine the minimum strength, and its uncertainty, of a set of specimens, and then must translate this laboratory data into a projection of the reliability of components manufactured from the material. This paper sets forth new guidelines for the choice of a statistical methodology to fit the laboratory data and puts forth a procedure – known as tolerance limits and coverage – to extrapolate this data to predict component reliability. Data on a borosilicate glass is used to demonstrate the usefulness of this procedure.
{"title":"A new statistical methodology for assessing mechanical survivability of brittle materials","authors":"S. Freiman, J. Fong","doi":"10.3233/sfc-221504","DOIUrl":"https://doi.org/10.3233/sfc-221504","url":null,"abstract":"Brittle materials such as ceramics are subject to fracture without warning. Because non-destructive techniques are unreliable for determining potential fracture sources in ceramic materials one must rely on statistical analysis of laboratory strength data. This data is used to determine the minimum strength, and its uncertainty, of a set of specimens, and then must translate this laboratory data into a projection of the reliability of components manufactured from the material. This paper sets forth new guidelines for the choice of a statistical methodology to fit the laboratory data and puts forth a procedure – known as tolerance limits and coverage – to extrapolate this data to predict component reliability. Data on a borosilicate glass is used to demonstrate the usefulness of this procedure.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48694332","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}
High pressure hydrogen storage is one of the most important ways of hydrogen energy storage and transportation. As the core component of high-pressure hydrogen storage, service strength and bearing capacity of carbon fiber wound hydrogen cylinder are very important for the safe transportation of hydrogen. In this paper, the simulation model of carbon fiber wound hydrogen cylinder is established, the stress distributions of Al-liner and winding layer are studied, and effects of self-tightening pressure, winding angle and thickness of winding layer on the stress distribution of hydrogen cylinder are studied. The results show that the designed carbon fiber wound cylinder meets the working requirements of 35 MPa. The self-tightening pressure can reduce the Al-liner stress in the working state and improve the utilization rate of the winding layer. With the use of hydrogen cylinders, the internal pressure decreases, and the maximum stress of hydrogen cylinders first decreases and then increases. The principal stress of winding layer decreases with the decrease of internal pressure. Increasing the winding angle of spiral layer can reduce the stress of Al-liner and the principal stress of hoop winding layer, but the principal stress of helix winding layer increases. With the increase of winding layer thickness, the hydrogen cylinder stress decreases gradually.
{"title":"Mechanical characteristics and parametric analysis of carbon fiber wound hydrogen cylinder for vehicles","authors":"J. Zhang, W. J. Jiang, R. Yang","doi":"10.3233/sfc-220291","DOIUrl":"https://doi.org/10.3233/sfc-220291","url":null,"abstract":"High pressure hydrogen storage is one of the most important ways of hydrogen energy storage and transportation. As the core component of high-pressure hydrogen storage, service strength and bearing capacity of carbon fiber wound hydrogen cylinder are very important for the safe transportation of hydrogen. In this paper, the simulation model of carbon fiber wound hydrogen cylinder is established, the stress distributions of Al-liner and winding layer are studied, and effects of self-tightening pressure, winding angle and thickness of winding layer on the stress distribution of hydrogen cylinder are studied. The results show that the designed carbon fiber wound cylinder meets the working requirements of 35 MPa. The self-tightening pressure can reduce the Al-liner stress in the working state and improve the utilization rate of the winding layer. With the use of hydrogen cylinders, the internal pressure decreases, and the maximum stress of hydrogen cylinders first decreases and then increases. The principal stress of winding layer decreases with the decrease of internal pressure. Increasing the winding angle of spiral layer can reduce the stress of Al-liner and the principal stress of hoop winding layer, but the principal stress of helix winding layer increases. With the increase of winding layer thickness, the hydrogen cylinder stress decreases gradually.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42449346","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}
J. F. Santa, J. J. Toro-Castrillón, M. Pérez Giraldo, J. Jaramillo, G. Hernández, A. Toro
The failure analysis of a fractured wheel from a train travelling in a heavy-haul line was carried out. The microstructure of the wheel was studied by Light Optical Microscopy (LOM) and the chemical composition was analyzed by Optical Emission Spectrometry (OES). Tensile tests were performed in samples extracted from the fractured wheel to evaluate mechanical properties. The results from the material’s characterization combined with the fractographic examination and the stress analysis by finite-element modeling (FEM) allowed to conclude that the wheel failed due to fatigue originated in a heavily deformed surface layer produced by rolling contact fatigue (RCF), which was not timely removed in maintenance interventions. The main crack propagated from the surface to the rim and caused a failure known as Vertical Split Rim (VSR).
{"title":"Failure analysis of a heavy-haul train wheel","authors":"J. F. Santa, J. J. Toro-Castrillón, M. Pérez Giraldo, J. Jaramillo, G. Hernández, A. Toro","doi":"10.3233/sfc-220285","DOIUrl":"https://doi.org/10.3233/sfc-220285","url":null,"abstract":"The failure analysis of a fractured wheel from a train travelling in a heavy-haul line was carried out. The microstructure of the wheel was studied by Light Optical Microscopy (LOM) and the chemical composition was analyzed by Optical Emission Spectrometry (OES). Tensile tests were performed in samples extracted from the fractured wheel to evaluate mechanical properties. The results from the material’s characterization combined with the fractographic examination and the stress analysis by finite-element modeling (FEM) allowed to conclude that the wheel failed due to fatigue originated in a heavily deformed surface layer produced by rolling contact fatigue (RCF), which was not timely removed in maintenance interventions. The main crack propagated from the surface to the rim and caused a failure known as Vertical Split Rim (VSR).","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47386145","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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