Pub Date : 2020-03-01DOI: 10.1142/S1756973719500021
M. Shahzamanian, W. Basirun
This study uses the finite element method (FEM) to measure the mechanical properties of microstructure-based cementitious representative volume elements (RVEs) with various water–cement ratios (W/Cs) generated by CEMHYD3D. The finite element boundary condition effects that significantly and computationally change the elastic properties are studied and discussed. Various boundary conditions in ABAQUS are applied and compared with the results obtained using the variational asymptotic method for unit cell homogenization (VAMUCH). This comparison is conducted using ANSYS. This study aims to analyze and determine the effect of different boundary conditions in detail on the prediction of the elastic properties of cementitious RVE with various W/Cs and identify the best approach in this regard. Results show that Young’s, shear, and bulk moduli decrease with the increase in W/C and the boundary conditions in ABAQUS influence the outcomes, particularly on bulk modulus and Poisson’s ratio.
{"title":"Modeling of Cementitious Representative Volume Element with Various Water–Cement Ratios","authors":"M. Shahzamanian, W. Basirun","doi":"10.1142/S1756973719500021","DOIUrl":"https://doi.org/10.1142/S1756973719500021","url":null,"abstract":"This study uses the finite element method (FEM) to measure the mechanical properties of microstructure-based cementitious representative volume elements (RVEs) with various water–cement ratios (W/Cs) generated by CEMHYD3D. The finite element boundary condition effects that significantly and computationally change the elastic properties are studied and discussed. Various boundary conditions in ABAQUS are applied and compared with the results obtained using the variational asymptotic method for unit cell homogenization (VAMUCH). This comparison is conducted using ANSYS. This study aims to analyze and determine the effect of different boundary conditions in detail on the prediction of the elastic properties of cementitious RVE with various W/Cs and identify the best approach in this regard. Results show that Young’s, shear, and bulk moduli decrease with the increase in W/C and the boundary conditions in ABAQUS influence the outcomes, particularly on bulk modulus and Poisson’s ratio.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973719500021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41896943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-01DOI: 10.1142/S1756973719300016
A. Khorshidi
Some accelerator technologies are already used for commercial [Formula: see text]Mo-99mTc production, as the economic criteria are considered representative of the main differences between diverse technologies including accelerators and reactors. This study has provided a review of known and potential [Formula: see text]Mo production using conventional medical facilities. Accelerator-based method in 99mTc production via ([Formula: see text], [Formula: see text]) direct reaction on [Formula: see text]Mo was simulated using 18[Formula: see text]MeV proton beam. Meanwhile, a conceptual design for indirect [Formula: see text]Mo production via [Formula: see text]Mo([Formula: see text])[Formula: see text]Mo and [Formula: see text]Mo(n,[Formula: see text]2n)[Formula: see text]Mo reactions was investigated when an electron source of 35[Formula: see text]MeV by accelerator is used. These indirect reactions were explored via inserted [Formula: see text]Mo samples at different positions inside the lead region. Furthermore, Adiabatic Resonance Crossing (ARC) method based on proton accelerator via transmutation in [Formula: see text]Mo([Formula: see text]Mo was examined when the 30[Formula: see text]MeV proton beam is used. Saturation activity and yield were investigated using alternative proposed methods. The potential proliferation risk associated with accelerator technetium production is minimal. While accelerators could be turned into neutron sources which could in turn be used to irradiate [Formula: see text]U to breed plutonium, and centrifuges used to enrich [Formula: see text]Mo for targets could conceivably be turned to enriching uranium, this would result in very tiny global production capability particularly compared with research or power reactors. The potential of the fresh methods could provide a replacement or complement over current reactor-based supply sources in various radioisotopes production purposes.
{"title":"Accelerator-Based Methods in Radio-Material 99Mo/99mTc Production Alternatives by Monte Carlo Method: The Scientific-Expedient Considerations in Nuclear Medicine","authors":"A. Khorshidi","doi":"10.1142/S1756973719300016","DOIUrl":"https://doi.org/10.1142/S1756973719300016","url":null,"abstract":"Some accelerator technologies are already used for commercial [Formula: see text]Mo-99mTc production, as the economic criteria are considered representative of the main differences between diverse technologies including accelerators and reactors. This study has provided a review of known and potential [Formula: see text]Mo production using conventional medical facilities. Accelerator-based method in 99mTc production via ([Formula: see text], [Formula: see text]) direct reaction on [Formula: see text]Mo was simulated using 18[Formula: see text]MeV proton beam. Meanwhile, a conceptual design for indirect [Formula: see text]Mo production via [Formula: see text]Mo([Formula: see text])[Formula: see text]Mo and [Formula: see text]Mo(n,[Formula: see text]2n)[Formula: see text]Mo reactions was investigated when an electron source of 35[Formula: see text]MeV by accelerator is used. These indirect reactions were explored via inserted [Formula: see text]Mo samples at different positions inside the lead region. Furthermore, Adiabatic Resonance Crossing (ARC) method based on proton accelerator via transmutation in [Formula: see text]Mo([Formula: see text]Mo was examined when the 30[Formula: see text]MeV proton beam is used. Saturation activity and yield were investigated using alternative proposed methods. The potential proliferation risk associated with accelerator technetium production is minimal. While accelerators could be turned into neutron sources which could in turn be used to irradiate [Formula: see text]U to breed plutonium, and centrifuges used to enrich [Formula: see text]Mo for targets could conceivably be turned to enriching uranium, this would result in very tiny global production capability particularly compared with research or power reactors. The potential of the fresh methods could provide a replacement or complement over current reactor-based supply sources in various radioisotopes production purposes.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973719300016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48205182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-11DOI: 10.1142/s1756973720500031
Fausto Raschioni, R. Longo, A. Mehmanparast, C. Rizzo
The aim of this study is to investigate the technical feasibility of an innovative vertical axis floating wind turbine concept with the main focus on the design and verification of the mooring system. The study is developed through iterative processes in order to identify the optimum design for the new floating wind turbine concept. The Ultimate Limit State (ULS) criteria have been considered to verify the integrity of the mooring system in the extreme environmental conditions with a 50-year return period. For this purpose, time domain dynamic analysis has been performed using the commercial software OrcaFlex [Orcina website, OrcaFlex software, https://www.orcina.com/ ]. Although the analysis is carried out for a specific site deemed suitable for the project, the results can be used as an input for any future application in other locations. The present study is intended to be a proof of concept with a proposed scientific framework for optimization of the mooring system which is considered to be a crucial part in the design of floating wind turbines due to their complex dynamic behavior.
{"title":"Mooring System Design and Verification for a Floating Vertical Axis Wind Turbine","authors":"Fausto Raschioni, R. Longo, A. Mehmanparast, C. Rizzo","doi":"10.1142/s1756973720500031","DOIUrl":"https://doi.org/10.1142/s1756973720500031","url":null,"abstract":"The aim of this study is to investigate the technical feasibility of an innovative vertical axis floating wind turbine concept with the main focus on the design and verification of the mooring system. The study is developed through iterative processes in order to identify the optimum design for the new floating wind turbine concept. The Ultimate Limit State (ULS) criteria have been considered to verify the integrity of the mooring system in the extreme environmental conditions with a 50-year return period. For this purpose, time domain dynamic analysis has been performed using the commercial software OrcaFlex [Orcina website, OrcaFlex software, https://www.orcina.com/ ]. Although the analysis is carried out for a specific site deemed suitable for the project, the results can be used as an input for any future application in other locations. The present study is intended to be a proof of concept with a proposed scientific framework for optimization of the mooring system which is considered to be a crucial part in the design of floating wind turbines due to their complex dynamic behavior.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/s1756973720500031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49124511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-06DOI: 10.1142/S1756973718500105
François Dagry, A. Mehmanparast, Patrick Müller, Klaus Pantke
The structural integrity of large diameter wind turbine bearings have been investigated using the built-in “contour integral” tool in ABAQUS finite element software package by modeling three-dimens...
{"title":"Fracture Mechanics Assessment of Large Diameter Wind Turbine Bearings","authors":"François Dagry, A. Mehmanparast, Patrick Müller, Klaus Pantke","doi":"10.1142/S1756973718500105","DOIUrl":"https://doi.org/10.1142/S1756973718500105","url":null,"abstract":"The structural integrity of large diameter wind turbine bearings have been investigated using the built-in “contour integral” tool in ABAQUS finite element software package by modeling three-dimens...","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718500105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47188658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-06DOI: 10.1142/S1756973718500129
E. Bonifaz, J. M. Conde, A. Czekanski
Microstructure and defect development in the gas tungsten arc weld process is influenced by the solidification and melt-pool dynamics. Melt-pool geometrical parameters which depend mainly on heat i...
{"title":"Determination of Secondary Dendrite Arm Spacing for In-738LC Gas-Tungsten-Arc-Welds","authors":"E. Bonifaz, J. M. Conde, A. Czekanski","doi":"10.1142/S1756973718500129","DOIUrl":"https://doi.org/10.1142/S1756973718500129","url":null,"abstract":"Microstructure and defect development in the gas tungsten arc weld process is influenced by the solidification and melt-pool dynamics. Melt-pool geometrical parameters which depend mainly on heat i...","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718500129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42033485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-06DOI: 10.1142/S1756973718500117
Mohammad Katebi, B. Gatmiri, P. Maghoul
This paper investigates topographic effects of rocky valleys with irregular topographic conditions subjected to vertically propagating SV waves of Ricker type using a boundary element code. Valleys...
{"title":"A Numerical Study on the Seismic Site Response of Rocky Valleys with Irregular Topographic Conditions","authors":"Mohammad Katebi, B. Gatmiri, P. Maghoul","doi":"10.1142/S1756973718500117","DOIUrl":"https://doi.org/10.1142/S1756973718500117","url":null,"abstract":"This paper investigates topographic effects of rocky valleys with irregular topographic conditions subjected to vertically propagating SV waves of Ricker type using a boundary element code. Valleys...","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718500117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44572332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-11DOI: 10.1142/S1756973718420040
L. Moreno, L. Távara, E. Correa, F. París
In this work, a recently proposed numerical tool is used to predict the onset and growth of debonds appearing along a single glass/carbon fiber embedded in an epoxy matrix subjected to transverse loads. The fiber-matrix system is modelled using the FEA commercial code ABAQUS, together with a solving algorithm programmed in Python and named Sequential Linear Analysis (SLA). Besides, the interface behavior is modeled using the Linear Elastic Brittle Interface Model (LEBIM) included in ABAQUS by means of a UMAT subroutine. The developed models are able to reproduce the non-symmetrical (one-side) debond at the fiber-matrix interface. Moreover, the results obtained show that the appearance of a unilateral debond may be affected both by the material employed and the size of the matrix cell where the fiber is embedded.
{"title":"Sequential Linear Analysis for the Prediction of the Symmetrical or Non-Symmetrical Character of the Debond Onset and Propagation Along a Fiber-Matrix Interface","authors":"L. Moreno, L. Távara, E. Correa, F. París","doi":"10.1142/S1756973718420040","DOIUrl":"https://doi.org/10.1142/S1756973718420040","url":null,"abstract":"In this work, a recently proposed numerical tool is used to predict the onset and growth of debonds appearing along a single glass/carbon fiber embedded in an epoxy matrix subjected to transverse loads. The fiber-matrix system is modelled using the FEA commercial code ABAQUS, together with a solving algorithm programmed in Python and named Sequential Linear Analysis (SLA). Besides, the interface behavior is modeled using the Linear Elastic Brittle Interface Model (LEBIM) included in ABAQUS by means of a UMAT subroutine. The developed models are able to reproduce the non-symmetrical (one-side) debond at the fiber-matrix interface. Moreover, the results obtained show that the appearance of a unilateral debond may be affected both by the material employed and the size of the matrix cell where the fiber is embedded.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718420040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45921857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-11DOI: 10.1142/S1756973718420027
J. Cañas, L. Távara, A. Blázquez, A. Estefani
The quality of composite–composite bonded joints is a very important issue for industries, especially for the aerospace sector. A deficient joint may stop the manufacturing process and its repairing may include very high costs. Nowadays, the quality of the joint is obtained by means of interlaminar fracture toughness tests, estimating the [Formula: see text] value (Energy Release Rate used to produce crack propagation) over coupons with (theoretically) the same conditions as those included in an actual part. Usually, [Formula: see text] is obtained by means of a Double Cantilever Beam (DCB) test. Although DCB is the reference test, it may present some drawbacks when a non-symmetrical coupon is used and when the adherents stiffness is low. An alternative to DCB is the Climbing Drum Peel (CDP) test which is able to address some of the DCB drawbacks. Nevertheless, both tests need the use of a universal testing machine, then they cannot be done in situ. In the present investigation, DCB and CDP main characteristics are analyzed and a new device, called Horizontal Drum Peel (HDP), which includes the advantages of previous tests and the possibility to perform the test over an actual part is presented.
{"title":"Overview of Gc Tests Used to Evaluate Composite–Composite Adhesive Joints","authors":"J. Cañas, L. Távara, A. Blázquez, A. Estefani","doi":"10.1142/S1756973718420027","DOIUrl":"https://doi.org/10.1142/S1756973718420027","url":null,"abstract":"The quality of composite–composite bonded joints is a very important issue for industries, especially for the aerospace sector. A deficient joint may stop the manufacturing process and its repairing may include very high costs. Nowadays, the quality of the joint is obtained by means of interlaminar fracture toughness tests, estimating the [Formula: see text] value (Energy Release Rate used to produce crack propagation) over coupons with (theoretically) the same conditions as those included in an actual part. Usually, [Formula: see text] is obtained by means of a Double Cantilever Beam (DCB) test. Although DCB is the reference test, it may present some drawbacks when a non-symmetrical coupon is used and when the adherents stiffness is low. An alternative to DCB is the Climbing Drum Peel (CDP) test which is able to address some of the DCB drawbacks. Nevertheless, both tests need the use of a universal testing machine, then they cannot be done in situ. In the present investigation, DCB and CDP main characteristics are analyzed and a new device, called Horizontal Drum Peel (HDP), which includes the advantages of previous tests and the possibility to perform the test over an actual part is presented.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718420027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44490726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-11DOI: 10.1142/S1756973718420015
L. García-Guzmán, L. Távara, J. Reinoso, J. Justo, F. París
The advances in manufacturing techniques allow the generation of new geometric conceptions and open a new paradigm in adhesive joints design. Structured interfaces constitute an excellent method to improve the resistance properties of these kinds of joining systems, Additive Layer Manufacturing (ALM or 3D printing) being an appropriate procedure to perform these designs. In this study, double-cantilever beam (DCB) tests with different trapezoidal patterns are investigated in terms of fracture resistance from experimental and analytical points of view in order to analyze the influence of the geometry in the energy release rate of the structure. The main goal of the current investigation is to examine the system response under the variation of the analytical approach parameters (based on a cohesive-zone model (CZM) technique). Particularly, a wider range of mixed-mode fracture conditions can be integrated by means of establishing different penalty stiffnesses in normal and shear directions, [Formula: see text] and [Formula: see text], respectively. Finally, a correlation between the experimental and analytical results for the proposed trapezoidal interfaces with different aspect ratios [Formula: see text] (where [Formula: see text] and [Formula: see text] identify the amplitude and wavelength of the interface profile, respectively) is shown. A satisfactory agreement between the predicted and the experimental data is achieved, emphasizing that the relation [Formula: see text] has a significant influence on the results obtained and, therefore, a correct characterization of the joint is needed.
{"title":"Analysis of 3D Printed Trapezoidal Interfaces by Means of a Novel Cohesive-Based Analytical Approach","authors":"L. García-Guzmán, L. Távara, J. Reinoso, J. Justo, F. París","doi":"10.1142/S1756973718420015","DOIUrl":"https://doi.org/10.1142/S1756973718420015","url":null,"abstract":"The advances in manufacturing techniques allow the generation of new geometric conceptions and open a new paradigm in adhesive joints design. Structured interfaces constitute an excellent method to improve the resistance properties of these kinds of joining systems, Additive Layer Manufacturing (ALM or 3D printing) being an appropriate procedure to perform these designs. In this study, double-cantilever beam (DCB) tests with different trapezoidal patterns are investigated in terms of fracture resistance from experimental and analytical points of view in order to analyze the influence of the geometry in the energy release rate of the structure. The main goal of the current investigation is to examine the system response under the variation of the analytical approach parameters (based on a cohesive-zone model (CZM) technique). Particularly, a wider range of mixed-mode fracture conditions can be integrated by means of establishing different penalty stiffnesses in normal and shear directions, [Formula: see text] and [Formula: see text], respectively. Finally, a correlation between the experimental and analytical results for the proposed trapezoidal interfaces with different aspect ratios [Formula: see text] (where [Formula: see text] and [Formula: see text] identify the amplitude and wavelength of the interface profile, respectively) is shown. A satisfactory agreement between the predicted and the experimental data is achieved, emphasizing that the relation [Formula: see text] has a significant influence on the results obtained and, therefore, a correct characterization of the joint is needed.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718420015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41247019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-11DOI: 10.1142/S1756973718420039
Xiaojun Yan, Xiaoyu Qin, Dawei Huang
Compared with standard specimens, fatigue tests on full-scale turbine blades can take factors such as geometry and manufacturing process into consideration of life assessment. However, for combined fatigue tests of full-scale turbine blades, there exist two challenges. The first one is that it is difficult to apply combined loads of centrifugal force (low cycle fatigue, LCF) and vibration force (high cycle fatigue, HCF) properly because of the interaction between these loads. The second one is that it is hard to determine the range of HCF load/stress which the blade experiences at service conditions. To address these two challenges, firstly, a set of two-path fixture is designed to apply combined loads on the test blade, which can transfer LCF and HCF load separately by different paths. And secondly, two methods, i.e. the inverse method and the contrast method are proposed to estimate the HCF stress level for turbine blades at service conditions. The inverse method infers the HCF stress level by comparing blade failure data between field (in service) and bench tests conditions, while the contrast method obtains HCF stress level by comparing blade failure data between new and used blades under bench tests conditions. Detailed procedures of high temperature combined fatigue tests on full-scale blade are presented, and experimental life data is also included and analyzed.
{"title":"High-Temperature Combined Fatigue Tests on Full-Scale Turbine Blades","authors":"Xiaojun Yan, Xiaoyu Qin, Dawei Huang","doi":"10.1142/S1756973718420039","DOIUrl":"https://doi.org/10.1142/S1756973718420039","url":null,"abstract":"Compared with standard specimens, fatigue tests on full-scale turbine blades can take factors such as geometry and manufacturing process into consideration of life assessment. However, for combined fatigue tests of full-scale turbine blades, there exist two challenges. The first one is that it is difficult to apply combined loads of centrifugal force (low cycle fatigue, LCF) and vibration force (high cycle fatigue, HCF) properly because of the interaction between these loads. The second one is that it is hard to determine the range of HCF load/stress which the blade experiences at service conditions. To address these two challenges, firstly, a set of two-path fixture is designed to apply combined loads on the test blade, which can transfer LCF and HCF load separately by different paths. And secondly, two methods, i.e. the inverse method and the contrast method are proposed to estimate the HCF stress level for turbine blades at service conditions. The inverse method infers the HCF stress level by comparing blade failure data between field (in service) and bench tests conditions, while the contrast method obtains HCF stress level by comparing blade failure data between new and used blades under bench tests conditions. Detailed procedures of high temperature combined fatigue tests on full-scale blade are presented, and experimental life data is also included and analyzed.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718420039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47206105","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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