Pub Date : 2024-10-29DOI: 10.1016/j.engfailanal.2024.109002
Failure analysis of a hydropower plant turbine shaft was performed by using the Finite Element Method (FEM) to assess its structural integrity and remaining life. Static and dynamic loading was applied to assess relevant fracture mechanics parameters using FEM for stress analysis and its extended version (XFEM) for simulation of fatigue crack growth. Application of XFEM to turbine shaft crack growth problem is in focus of this paper, in combination with material properties and its expected behavior under amplitude loading. The goal of the research was to determine the remaining life of a turbine shaft that has failed in service. Such an approach provided clear answer to why the cracked shaft failed in a short period of time. Based on that, suggestions to prevent such a failure are given.
{"title":"The role of numerical simulation of fatigue crack growth in failure analysis of a turbine shaft","authors":"","doi":"10.1016/j.engfailanal.2024.109002","DOIUrl":"10.1016/j.engfailanal.2024.109002","url":null,"abstract":"<div><div>Failure analysis of a hydropower plant turbine shaft was performed by using the Finite Element Method (FEM) to assess its structural integrity and remaining life. Static and dynamic loading was applied to assess relevant fracture mechanics parameters using FEM for stress analysis and its extended version (XFEM) for simulation of fatigue crack growth. Application of XFEM to turbine shaft crack growth problem is in focus of this paper, in combination with material properties and its expected behavior under amplitude loading. The goal of the research was to determine the remaining life of a turbine shaft that has failed in service. Such an approach provided clear answer to why the cracked shaft failed in a short period of time. Based on that, suggestions to prevent such a failure are given.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1016/j.engfailanal.2024.109019
This study, for the first time, investigates the failure behavior of hole hemmed joints with a novel configuration in shear tests. These joints are formed through plastic deformation without the need for additional elements, heat, or welding. The aim is to evaluate their potential for connecting hybrid copper–aluminum busbars in electric vehicle batteries. Initially, copper’s fracture limits are characterized under various loading conditions, and the Modified Mohr-Coulomb criterion is calibrated. The hole hemming process is then used to join AA6082-T4 aluminum and Cu-ETP R240 copper sheets by deforming and folding the outer aluminum sheet onto the inner copper sheet, creating a mechanical interlock. This is followed by shear tests on the resulting joints. A comprehensive finite element model is developed to simulate both the joining process and the shear test. Results indicate that the joints fail gradually through hole bearing, with cracks forming and propagating in the copper sheet. The mechanical interlock, influenced by punch displacement, enhances failure load and displacement while reducing the initial load. Only the copper inner sheet is damaged during shear tests, while the aluminum outer sheet is damaged during the joining process. With a maximum shear strength of 4.54 kN and a displacement of 13.84 mm for a mechanical interlock of 0.9 mm, these joints show significant potential for hybrid busbar applications in electric vehicle batteries.
{"title":"Failure behavior of hole hemmed joints with a novel configuration for hybrid busbars in electric vehicle batteries","authors":"","doi":"10.1016/j.engfailanal.2024.109019","DOIUrl":"10.1016/j.engfailanal.2024.109019","url":null,"abstract":"<div><div>This study, for the first time, investigates the failure behavior of hole hemmed joints with a novel configuration in shear tests. These joints are formed through plastic deformation without the need for additional elements, heat, or welding. The aim is to evaluate their potential for connecting hybrid copper–aluminum busbars in electric vehicle batteries. Initially, copper’s fracture limits are characterized under various loading conditions, and the Modified Mohr-Coulomb criterion is calibrated. The hole hemming process is then used to join AA6082-T4 aluminum and Cu-ETP R240 copper sheets by deforming and folding the outer aluminum sheet onto the inner copper sheet, creating a mechanical interlock. This is followed by shear tests on the resulting joints. A comprehensive finite element model is developed to simulate both the joining process and the shear test. Results indicate that the joints fail gradually through hole bearing, with cracks forming and propagating in the copper sheet. The mechanical interlock, influenced by punch displacement, enhances failure load and displacement while reducing the initial load. Only the copper inner sheet is damaged during shear tests, while the aluminum outer sheet is damaged during the joining process. With a maximum shear strength of 4.54 kN and a displacement of 13.84 mm for a mechanical interlock of 0.9 mm, these joints show significant potential for hybrid busbar applications in electric vehicle batteries.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1016/j.engfailanal.2024.109016
Seismic loads in earthquake-prone regions significantly affect the structural integrity of pipelines at urban natural gas distribution stations, compromising safety. This study analyzes the dynamic response of pipelines in gas distribution stations under seismic loading and proposes effective measures to mitigate stress concentration. A numerical model of the pipeline in the gas distribution station, based on actual cases, was established. The material’s constitutive relationship was derived from tensile tests. The seismic response spectrum, obtained from ground motion data, was introduced to analyze the pipeline’s mechanical behavior. The dynamic response analysis identified critical stress concentration locations in the pipeline under operational conditions. Based on displacement analysis, the study recommended seismic measures. Results indicated that under seismic loading, higher stress values occurred primarily in pipeline sections with intricate flow pattern variations. The manifold connection was the most vulnerable point, with its average stress being 3.37 times that of the system’s average stress. The proposed seismic measures effectively reduced stress concentration at these critical points, mitigating the earthquake’s impact on the gas distribution station. This study establishes a theoretical framework for improving the seismic design and maintenance of natural gas distribution stations, enhancing their seismic resilience and operational safety.
{"title":"Dynamic response analysis of pipelines in gas distribution stations under seismic loads","authors":"","doi":"10.1016/j.engfailanal.2024.109016","DOIUrl":"10.1016/j.engfailanal.2024.109016","url":null,"abstract":"<div><div>Seismic loads in earthquake-prone regions significantly affect the structural integrity of pipelines at urban natural gas distribution stations, compromising safety. This study analyzes the dynamic response of pipelines in gas distribution stations under seismic loading and proposes effective measures to mitigate stress concentration. A numerical model of the pipeline in the gas distribution station, based on actual cases, was established. The material’s constitutive relationship was derived from tensile tests. The seismic response spectrum, obtained from ground motion data, was introduced to analyze the pipeline’s mechanical behavior. The dynamic response analysis identified critical stress concentration locations in the pipeline under operational conditions. Based on displacement analysis, the study recommended seismic measures. Results indicated that under seismic loading, higher stress values occurred primarily in pipeline sections with intricate flow pattern variations. The manifold connection was the most vulnerable point, with its average stress being 3.37 times that of the system’s average stress. The proposed seismic measures effectively reduced stress concentration at these critical points, mitigating the earthquake’s impact on the gas distribution station. This study establishes a theoretical framework for improving the seismic design and maintenance of natural gas distribution stations, enhancing their seismic resilience and operational safety.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1016/j.engfailanal.2024.109007
The primary measure of the performance of a rolling guide in a machine tool is its accuracy, and wear is the main factor leading to the decline of rolling guide accuracy. This paper proposes a rolling guide precision prediction method based on micro-convex group, aiming to accurately simulate the fatigue wear process of machine tool rolling guide under target working conditions and predict the resulting precision decline. First, analyze the characteristics of the working conditions and surface morphology wear traces, to determine the fatigue wear is the main cause of rolling guide precision degradation. Then, the sliding amount calculation method and the average wear equivalent calculation method based on the energy wear theory are proposed when the roller and guide surface generate relative motion, and the fatigue wear model of rolling guide is established by analyzing the change process of wear rate. Based on this, a mapping relationship between wear depth and rolling guide accuracy is established, and the straightness and angular errors of the rolling guide during work are predicted according to the proposed wear model. Ultimately, the validity of the proposed method is verified through experimental data validation.
{"title":"Accuracy prediction method for rolling guide under variable wear conditions based on micro-convex body group","authors":"","doi":"10.1016/j.engfailanal.2024.109007","DOIUrl":"10.1016/j.engfailanal.2024.109007","url":null,"abstract":"<div><div>The primary measure of the performance of a rolling guide in a machine tool is its accuracy, and wear is the main factor leading to the decline of rolling guide accuracy. This paper proposes a rolling guide precision prediction method based on micro-convex group, aiming to accurately simulate the fatigue wear process of machine tool rolling guide under target working conditions and predict the resulting precision decline. First, analyze the characteristics of the working conditions and surface morphology wear traces, to determine the fatigue wear is the main cause of rolling guide precision degradation. Then, the sliding amount calculation method and the average wear equivalent calculation method based on the energy wear theory are proposed when the roller and guide surface generate relative motion, and the fatigue wear model of rolling guide is established by analyzing the change process of wear rate. Based on this, a mapping relationship between wear depth and rolling guide accuracy is established, and the straightness and angular errors of the rolling guide during work are predicted according to the proposed wear model. Ultimately, the validity of the proposed method is verified through experimental data validation.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.engfailanal.2024.109008
Understanding the failure process in surrounding rocks is essential for assessing the stability of underground spaces and predicting potential disasters. Although failure patterns around openings of various shapes have been studied, the effects of geological discontinuities on the characteristics of failure zones around these openings remain inadequately understood. This study investigates failures around openings and flaws by analyzing acoustic emission (AE) characteristics. Digital image correlation (DIC) was employed to measure the failure zones of specimens during experiments, and particle flow code (PFC) software modeled the failure process. A statistical tool quantitatively assessed the cumulative number-strain curves of AE events, distinguishing between different distribution modes (single- or multi-peak). Additionally, the magnitude distribution and source mechanisms of AE events were analyzed to evaluate the effects of exposure conditions and flaw inclination angles on AE event occurrence. Both experimental and numerical results showed strong agreement, demonstrating that exposure conditions and flaw inclination angles significantly affect AE event distribution and magnitude. Exposed flaws tended to suppress AE events on the side containing the flaws, whereas unexposed flaws promoted AE events on the side with flaws, with this effect varying based on flaw inclination angles. These findings provide valuable insights into the fracture characteristics of surrounding rocks in deep underground spaces affected by geological discontinuities.
{"title":"Effects of a single flaw on failure and acoustic emission characteristics around circular opening subjected to biaxial compression","authors":"","doi":"10.1016/j.engfailanal.2024.109008","DOIUrl":"10.1016/j.engfailanal.2024.109008","url":null,"abstract":"<div><div>Understanding the failure process in surrounding rocks is essential for assessing the stability of underground spaces and predicting potential disasters. Although failure patterns around openings of various shapes have been studied, the effects of geological discontinuities on the characteristics of failure zones around these openings remain inadequately understood. This study investigates failures around openings and flaws by analyzing acoustic emission (AE) characteristics. Digital image correlation (DIC) was employed to measure the failure zones of specimens during experiments, and particle flow code (PFC) software modeled the failure process. A statistical tool quantitatively assessed the cumulative number-strain curves of AE events, distinguishing between different distribution modes (single- or multi-peak). Additionally, the magnitude distribution and source mechanisms of AE events were analyzed to evaluate the effects of exposure conditions and flaw inclination angles on AE event occurrence. Both experimental and numerical results showed strong agreement, demonstrating that exposure conditions and flaw inclination angles significantly affect AE event distribution and magnitude. Exposed flaws tended to suppress AE events on the side containing the flaws, whereas unexposed flaws promoted AE events on the side with flaws, with this effect varying based on flaw inclination angles. These findings provide valuable insights into the fracture characteristics of surrounding rocks in deep underground spaces affected by geological discontinuities.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.engfailanal.2024.109005
For the actual combination of experimental results and engineering applications, it is of great significance to explore the influence of size on tensile failure behavior. Brazilian tests are carried out on granite and sandstone with different diameters to investigate size-dependent behavior of tensile failure and the affected acoustic and electromagnetic law. Only when the specimen reaches the peak load and the stress drops sharply after the final failure, there is an extremely significant acoustic and electromagnetic response. The tensile strength and Brazilian split modulus decrease in larger specimens, and the dispersion of repeated tests is also reduced. As the size of the rock disc increases, the acoustic emission activity generated from the final splitting failure gradually decreases, while the fractal dimension values of acoustic emission activity also show an increasing trend. It is indicated that relatively less activity occurred around the peak load in larger rocks and greater amounts of acoustic emission activity are generated before the final splitting failure. According to the failure type characterized by the parameter (RA-AF), the ratio of tensile fracture decreases with the increase of diameter. In the case of a larger size, the electromagnetic signal generated by the splitting failure is dominated by the lower frequency band. The size-dependent failure behavior can be attributed to the volume and microstructure differences in rock specimens. This further leads to varying degrees of charge and elastic energy accumulation at the microscale, ultimately affecting acoustic and electromagnetic signals.
{"title":"Acoustic and electromagnetic emission laws of rocks affected by size-dependent failure behavior under Brazilian tests","authors":"","doi":"10.1016/j.engfailanal.2024.109005","DOIUrl":"10.1016/j.engfailanal.2024.109005","url":null,"abstract":"<div><div>For the actual combination of experimental results and engineering applications, it is of great significance to explore the influence of size on tensile failure behavior. Brazilian tests are carried out on granite and sandstone with different diameters to investigate size-dependent behavior of tensile failure and the affected acoustic and electromagnetic law. Only when the specimen reaches the peak load and the stress drops sharply after the final failure, there is an extremely significant acoustic and electromagnetic response. The tensile strength and Brazilian split modulus decrease in larger specimens, and the dispersion of repeated tests is also reduced. As the size of the rock disc increases, the acoustic emission activity generated from the final splitting failure gradually decreases, while the fractal dimension values of acoustic emission activity also show an increasing trend. It is indicated that relatively less activity occurred around the peak load in larger rocks and greater amounts of acoustic emission activity are generated before the final splitting failure. According to the failure type characterized by the parameter (RA-AF), the ratio of tensile fracture decreases with the increase of diameter. In the case of a larger size, the electromagnetic signal generated by the splitting failure is dominated by the lower frequency band. The size-dependent failure behavior can be attributed to the volume and microstructure differences in rock specimens. This further leads to varying degrees of charge and elastic energy accumulation at the microscale, ultimately affecting acoustic and electromagnetic signals.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-26DOI: 10.1016/j.engfailanal.2024.109003
{"title":"Corrigendum to “Impact of oxide layer on performance and creep life of a superheater tube in a coal-fired power plant” [Eng. Failure Anal. 167 (2025) 108941]","authors":"","doi":"10.1016/j.engfailanal.2024.109003","DOIUrl":"10.1016/j.engfailanal.2024.109003","url":null,"abstract":"","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.engfailanal.2024.109001
The current method of inspecting railway joint bars involves the use of high-resolution cameras to detect fatigue cracks that have undergone significant cracking exposed to the surface. The novelty of the work presented in this paper discusses the development and application of non-contact ultrasonic surface wave approach to detect and characterize near-surface fatigue cracks in the head of the railway joint bars which is not usually accessible for inspection. Simulated cracks were implanted in the head of the two different used joint bars to assess the capabilities of the ultrasonic nondestructive evaluation (NDE) surface wave approach. One of the joint bars was implanted with 3.175 mm and 6.35 mm cracks in length, while the other joint bar was implanted with 12.7 mm and 25.4 mm cracks in length. Despite the complex geometry of railway joint bars, the laboratory proof-of-concept testing conducted in an immersion water tank demonstrated that the developed non-contact surface wave approach successfully detected implanted cracks in both joint bars. The results obtained from the study indicate that a 0.5 MHz ultrasonic transducer provided the best sensitivity for detecting implanted cracks compared to 1 MHz and 2.25 MHz transducers. Similarly, test results obtained with a 0.5 MHz ultrasonic transducer, launching a surface wave from an accessible area to an inaccessible area of the joint bar (where the implanted cracks were located) yielded a significantly higher signal-to-noise ratio (SNR) than the 1 MHz and 2.25 MHz transducer.
{"title":"Study on surface waves for detection of fatigue cracks in railway joint bars","authors":"","doi":"10.1016/j.engfailanal.2024.109001","DOIUrl":"10.1016/j.engfailanal.2024.109001","url":null,"abstract":"<div><div>The current method of inspecting railway joint bars involves the use of high-resolution cameras to detect fatigue cracks that have undergone significant cracking exposed to the surface. The novelty of the work presented in this paper discusses the development and application of non-contact ultrasonic surface wave approach to detect and characterize near-surface fatigue cracks in the head of the railway joint bars which is not usually accessible for inspection. Simulated cracks were implanted in the head of the two different used joint bars to assess the capabilities of the ultrasonic nondestructive evaluation (NDE) surface wave approach. One of the joint bars was implanted with 3.175 mm and 6.35 mm cracks in length, while the other joint bar was implanted with 12.7 mm and 25.4 mm cracks in length. Despite the complex geometry of railway joint bars, the laboratory proof-of-concept testing conducted in an immersion water tank demonstrated that the developed non-contact surface wave approach successfully detected implanted cracks in both joint bars. The results obtained from the study indicate that a 0.5 MHz ultrasonic transducer provided the best sensitivity for detecting implanted cracks compared to 1 MHz and 2.25 MHz transducers. Similarly, test results obtained with a 0.5 MHz ultrasonic transducer, launching a surface wave from an accessible area to an inaccessible area of the joint bar (where the implanted cracks were located) yielded a significantly higher signal-to-noise ratio (SNR) than the 1 MHz and 2.25 MHz transducer.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.engfailanal.2024.108999
Load sharing characteristic is very important for the reliability of the planetary gear train. Cracked gears can make the load sharing performance become worse. Nevertheless, previous studies have not paid enough attention to the influence of cracked gears on the load sharing behavior, when compared with the impact of multiple factors under healthy condition. An 18 degrees of freedom dynamic model for the spur planetary gear train is established based on the centralized parameters theory in this paper. The influences of cracked gears on the load sharing behavior are investigated, which include the cracked sun gear, the planet gear containing cracked side meshing with the sun gear, the planet gear having cracked side meshing with the ring gear and the cracked ring gear. Additionally, the sensitivity analysis of the external and internal load sharing behavior to different cracked components is conducted. The results indicate that the load distribution becomes more uneven with the propagation of crack in the sun gear and ring gear, while the change regulation is different for each cracked planet gear. Moreover, the load sharing characteristic of the external meshing is more sensitive to the cracked sun gear and the planet gear 1, which has the crack side meshing with the ring gear. While the load sharing characteristic of the internal meshing is more sensitive to the cracked ring gear and the planet gear 3, which owns the crack side meshing with the ring gear than others. The output of this paper will be useful for the crack fault diagnose and fault source identification of the planetary gear train system.
{"title":"A study on load sharing characteristics of the planetary gear train system with cracked gears","authors":"","doi":"10.1016/j.engfailanal.2024.108999","DOIUrl":"10.1016/j.engfailanal.2024.108999","url":null,"abstract":"<div><div>Load sharing characteristic is very important for the reliability of the planetary gear train. Cracked gears can make the load sharing performance become worse. Nevertheless, previous studies have not paid enough attention to the influence of cracked gears on the load sharing behavior, when compared with the impact of multiple factors under healthy condition. An 18 degrees of freedom dynamic model for the spur planetary gear train is established based on the centralized parameters theory in this paper. The influences of cracked gears on the load sharing behavior are investigated, which include the cracked sun gear, the planet gear containing cracked side meshing with the sun gear, the planet gear having cracked side meshing with the ring gear and the cracked ring gear. Additionally, the sensitivity analysis of the external and internal load sharing behavior to different cracked components is conducted. The results indicate that the load distribution becomes more uneven with the propagation of crack in the sun gear and ring gear, while the change regulation is different for each cracked planet gear. Moreover, the load sharing characteristic of the external meshing is more sensitive to the cracked sun gear and the planet gear 1, which has the crack side meshing with the ring gear. While the load sharing characteristic of the internal meshing is more sensitive to the cracked ring gear and the planet gear 3, which owns the crack side meshing with the ring gear than others. The output of this paper will be useful for the crack fault diagnose and fault source identification of the planetary gear train system.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.engfailanal.2024.108994
7050 aluminium alloy, as an important lightweight high-strength structural material because of its excellent characteristics, has increasing applications in aviation, aerospace, and launch vehicle manufacturing. Fatigue failure accounts for approximately 80 % of the structural failures in the engineering field, which leads to numerous losses and is highly uncertain and sudden. Therefore, fatigue life prediction of 7050 aluminium alloy has become a prominent research field. In this study, considering the two variables of stress ratio and stress concentration coefficient, fatigue tests of 7050 aluminium alloy under five different working conditions were conducted to evaluate the effect of these factors on the durability of 7050 aluminium alloy. A novel hybrid neural network model was proposed to solve the time-consuming problem of obtaining a large amount of S-N curve data through traditional fatigue tests. The model uses relatively low cycle fatigue test data for training, realizes data derivation, accurately predicts the fatigue limit of materials, and realizes the purpose of quickly evaluating the fatigue properties of 7050 aluminium alloy materials under different working conditions.
{"title":"Fatigue limit prediction of 7050 aluminium alloy based on experimental and shallow + deep hybrid neural network","authors":"","doi":"10.1016/j.engfailanal.2024.108994","DOIUrl":"10.1016/j.engfailanal.2024.108994","url":null,"abstract":"<div><div>7050 aluminium alloy, as an important lightweight high-strength structural material because of its excellent characteristics, has increasing applications in aviation, aerospace, and launch vehicle manufacturing. Fatigue failure accounts for approximately 80 % of the structural failures in the engineering field, which leads to numerous losses and is highly uncertain and sudden. Therefore, fatigue life prediction of 7050 aluminium alloy has become a prominent research field. In this study, considering the two variables of stress ratio and stress concentration coefficient, fatigue tests of 7050 aluminium alloy under five different working conditions were conducted to evaluate the effect of these factors on the durability of 7050 aluminium alloy. A novel hybrid neural network model was proposed to solve the time-consuming problem of obtaining a large amount of S-N curve data through traditional fatigue tests. The model uses relatively low cycle fatigue test data for training, realizes data derivation, accurately predicts the fatigue limit of materials, and realizes the purpose of quickly evaluating the fatigue properties of 7050 aluminium alloy materials under different working conditions.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号