E. Yogafanny, R. Triatmadja, F. Nurrochmad, Intan Supraba
The modified pervious concrete and cement mortar, known as pervious cement mortar (PCM), is designed with a specific composition to create pores. The coarse aggregate is removed to form smaller pore sizes. PCM acts as a water filter, needing higher permeability than cement mortar but less than pervious concrete. Its pores drain water while trapping impurities. This study compares the effects of sand-to-cement ratio (S/C), specimen thickness, and age on permeability and porosity. It also contrasts PCM's permeability coefficient determined by constant head and falling head methods. Numerous studies compare permeability coefficients in pervious concrete using these methods, but not for finer aggregate cement-based composite materials like pervious cement mortar. PCM uses fine aggregate (0.6 – 0.85 mm) at 3, 5, and 10 cm thickness with S/C ratios of 4 and 5. Findings show that S/C 5 specimens have significantly higher porosity than S/C 4. The S/C ratios notably impact permeability; the higher ratio means the higher permeability. Permeability coefficients for S/C 4 ranging from 0.006 – 0.075 cm/s, while S/C 5 ranging from 0.010 to 0.147 cm/s. The relationship between the permeability coefficient between the constant head and falling head methods at the age of 90 days specimen are Kc = 1.0516 Kf (S/C 4.2) and Kc = 0.9325 Kf (S/C 5.2). According to these findings, finer aggregates result in a significantly smaller permeability, to the extent that the constant head method is more reliable compared to the falling head method.
{"title":"PERMEABILITY COEFFICIENT OF PERVIOUS CEMENT MORTAR MEASURED BY THE CONSTANT HEAD AND FALLING HEAD METHODS","authors":"E. Yogafanny, R. Triatmadja, F. Nurrochmad, Intan Supraba","doi":"10.5937/jaes0-44066","DOIUrl":"https://doi.org/10.5937/jaes0-44066","url":null,"abstract":"The modified pervious concrete and cement mortar, known as pervious cement mortar (PCM), is designed with a specific composition to create pores. The coarse aggregate is removed to form smaller pore sizes. PCM acts as a water filter, needing higher permeability than cement mortar but less than pervious concrete. Its pores drain water while trapping impurities. This study compares the effects of sand-to-cement ratio (S/C), specimen thickness, and age on permeability and porosity. It also contrasts PCM's permeability coefficient determined by constant head and falling head methods. Numerous studies compare permeability coefficients in pervious concrete using these methods, but not for finer aggregate cement-based composite materials like pervious cement mortar. PCM uses fine aggregate (0.6 – 0.85 mm) at 3, 5, and 10 cm thickness with S/C ratios of 4 and 5. Findings show that S/C 5 specimens have significantly higher porosity than S/C 4. The S/C ratios notably impact permeability; the higher ratio means the higher permeability. Permeability coefficients for S/C 4 ranging from 0.006 – 0.075 cm/s, while S/C 5 ranging from 0.010 to 0.147 cm/s. The relationship between the permeability coefficient between the constant head and falling head methods at the age of 90 days specimen are Kc = 1.0516 Kf (S/C 4.2) and Kc = 0.9325 Kf (S/C 5.2). According to these findings, finer aggregates result in a significantly smaller permeability, to the extent that the constant head method is more reliable compared to the falling head method.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139256196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Spasojević-Brkić, A. Brkic, Martina Perišić, M. Misita, Nemanja Janev
Maintenance is especially crucial when it comes to construction machinery due its capacity to avoid or reduce the risk of serious accidents by recognizing probable failures and downtimes in a timely manner. To properly implement maintenance strategy, it is required to identify the existing linkages between downtime and failures that have already occurred first. This paper aims to analyze and compare data on the length of downtime, as well as the causes of downtime hazard levels on different bridge and gantry cranes. In order to ascertain whether there is a dependency between these two types of cranes, a comparison of the failure duration and hazard level between bridge and gantry cranes is done in this paper. In addition, a comparison of nine different types of bridge and gantry cranes were compared using the same comparation categories. After performing descriptive statistics and the Kolmogorov-Smirnov and Shapiro-Wilk normality tests, which revealed that the data did not follow a normal distribution, a comparison was done using the Mann-Whitney U test and the Kruskal-Wallis tests. All tests revealed no statisticaly significant differences in failure duration and hazard level within the tested categories, which opens up the possibility of applying the same risk management strategies and maintenance procedures regarding both examined crane types.
维护对于建筑机械尤为重要，因为它能够及时发现可能出现的故障和停机，从而避免或减少严重事故的风险。要正确实施维护策略，首先需要识别停机时间与已发生故障之间的现有联系。本文旨在分析和比较不同桥式起重机和龙门起重机的停机时间长度数据以及停机危险程度的原因。为了确定这两种起重机之间是否存在依赖关系，本文对桥式起重机和龙门起重机的故障持续时间和危害程度进行了比较。此外，还使用相同的比较类别对九种不同类型的桥式起重机和龙门起重机进行了比较。在进行了描述性统计、Kolmogorov-Smirnov 和 Shapiro-Wilk 正态性检验（检验结果显示数据不符合正态分布）之后，使用 Mann-Whitney U 检验和 Kruskal-Wallis 检验进行了比较。所有检验结果都表明，在所检验的类别中，故障持续时间和危险程度没有明显的统计学差异，这为对两种受检起重机类型采用相同的风险管理策略和维护程序提供了可能性。
{"title":"DIFFERENCES BETWEEN BRIDGE AND GANTRY CRANES’ DOWNTIMES","authors":"V. Spasojević-Brkić, A. Brkic, Martina Perišić, M. Misita, Nemanja Janev","doi":"10.5937/jaes0-43956","DOIUrl":"https://doi.org/10.5937/jaes0-43956","url":null,"abstract":"Maintenance is especially crucial when it comes to construction machinery due its capacity to avoid or reduce the risk of serious accidents by recognizing probable failures and downtimes in a timely manner. To properly implement maintenance strategy, it is required to identify the existing linkages between downtime and failures that have already occurred first. This paper aims to analyze and compare data on the length of downtime, as well as the causes of downtime hazard levels on different bridge and gantry cranes. In order to ascertain whether there is a dependency between these two types of cranes, a comparison of the failure duration and hazard level between bridge and gantry cranes is done in this paper. In addition, a comparison of nine different types of bridge and gantry cranes were compared using the same comparation categories. After performing descriptive statistics and the Kolmogorov-Smirnov and Shapiro-Wilk normality tests, which revealed that the data did not follow a normal distribution, a comparison was done using the Mann-Whitney U test and the Kruskal-Wallis tests. All tests revealed no statisticaly significant differences in failure duration and hazard level within the tested categories, which opens up the possibility of applying the same risk management strategies and maintenance procedures regarding both examined crane types.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139257971","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}
A. Windyandari, S. Sugeng, Sulaiman Sulaiman, Mohd. Ridwan, Adi Kurniawan Yusim
The Flat-sided Hull Vessel was introduced to simplify and create an efficient ship production process by eliminating the fairing work, bending, and curved panel line assembly. The built process simplification is expected that the FSHV can be produced by the traditional boat yard. However, the flat hull concept has slightly increased resistance performance. Therefore, implementing a resistance reduction device is endorsed to improve the boat's performance. The focus of the research is to identify the influence of the flat hull concept on seakeeping behavior. The hexagonal catamaran hull form was developed on the deadrise angle, angle of attack, and stern angle variation. Furthermore, the response amplitude operator and the motion spectral density of heave, roll, and pitch motion were calculated. Otherwise, the seakeeping performance of the hexagonal catamaran is compared to the original rounded catamaran. The results show that the hexagonal catamaran hulls have better seakeeping performance in the Beam Sea. However, the conventional catamaran has demonstrated superiority over the hexagonal catamaran in the Bow Quartering and Head Sea conditions.
{"title":"SEAKEEPING BEHAVIOR OF HEXAGONAL CATAMARAN HULL FORM AS AN ALTERNATIVE GEOMETRY DESIGN OF FLAT-SIDED HULL VESSEL","authors":"A. Windyandari, S. Sugeng, Sulaiman Sulaiman, Mohd. Ridwan, Adi Kurniawan Yusim","doi":"10.5937/jaes0-41412","DOIUrl":"https://doi.org/10.5937/jaes0-41412","url":null,"abstract":"The Flat-sided Hull Vessel was introduced to simplify and create an efficient ship production process by eliminating the fairing work, bending, and curved panel line assembly. The built process simplification is expected that the FSHV can be produced by the traditional boat yard. However, the flat hull concept has slightly increased resistance performance. Therefore, implementing a resistance reduction device is endorsed to improve the boat's performance. The focus of the research is to identify the influence of the flat hull concept on seakeeping behavior. The hexagonal catamaran hull form was developed on the deadrise angle, angle of attack, and stern angle variation. Furthermore, the response amplitude operator and the motion spectral density of heave, roll, and pitch motion were calculated. Otherwise, the seakeeping performance of the hexagonal catamaran is compared to the original rounded catamaran. The results show that the hexagonal catamaran hulls have better seakeeping performance in the Beam Sea. However, the conventional catamaran has demonstrated superiority over the hexagonal catamaran in the Bow Quartering and Head Sea conditions.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139265047","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}
Naima Jouilel, Nissrine Mhaiti, M. Radouani, Benaissa El Fahime
In this paper, the premature failure of the high speed railway wheel of power locomotive commissioned in Morocco since 2018 was investigated. A three dimensional model of the wheel is established, with account of specific wheel’s features, to perform the finite elements and modal analysis. Simulations were conducted for several functional diameters of wheels (850mm, 885mm, and 920mm) to figure out stress distribution in different operation conditions. Stress results show that the wheel bears the mechanical loading in both exceptional and fatigue loads, therefore a modal analysis of the structure in presence of facets, which create a vibratory state, is done to examine their effect on the premature fatigue of the wheel. Modal analysis reveals that the presence of facets leads to a vibratory mode near to resonance. Based on those results, critical operation points as function of facets number and wheel diameter were determined to avoid scenarios that lead to cracks and premature fatigue of the studied wheels. Existing maintenance procedures must be modified to overcome this problem and increase the wheel’s lifetime without affecting the operation safety of the high-speed train.
{"title":"NUMERICAL INVESTIGATION OF PREMATURE FATIGUE OF HIGH-SPEED TRAIN WHEELS IN PRESENCE OF FACETS DEFECT WITH CASE STUDY","authors":"Naima Jouilel, Nissrine Mhaiti, M. Radouani, Benaissa El Fahime","doi":"10.5937/jaes0-43734","DOIUrl":"https://doi.org/10.5937/jaes0-43734","url":null,"abstract":"In this paper, the premature failure of the high speed railway wheel of power locomotive commissioned in Morocco since 2018 was investigated. A three dimensional model of the wheel is established, with account of specific wheel’s features, to perform the finite elements and modal analysis. Simulations were conducted for several functional diameters of wheels (850mm, 885mm, and 920mm) to figure out stress distribution in different operation conditions. Stress results show that the wheel bears the mechanical loading in both exceptional and fatigue loads, therefore a modal analysis of the structure in presence of facets, which create a vibratory state, is done to examine their effect on the premature fatigue of the wheel. Modal analysis reveals that the presence of facets leads to a vibratory mode near to resonance. Based on those results, critical operation points as function of facets number and wheel diameter were determined to avoid scenarios that lead to cracks and premature fatigue of the studied wheels. Existing maintenance procedures must be modified to overcome this problem and increase the wheel’s lifetime without affecting the operation safety of the high-speed train.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139272661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study aims to identify, calculate the impact rating, and mitigate the effects on new ferry construction in Indonesian shipyards. The Risk Matrix method and Failure Mode and Effect Analysis (FMEA) are employed to analyze risk levels. Data were collected through field observations and interviews regarding risks and potential delays in ship components. The results reveal 23 potential hazard sources, with two risks having the highest Risk Priority Number (RPN) values. Assessment based on the quality control section that causes delays in the arrival of ME/AE/pumps and other mechanical equipment 366.18. Assessment of the Project Leader process Delay in the assembly/fabrication/erect process 519.49. Part of production leadership Delay in assembly/fabrication/erecting processes 317.37. Based on the assessment of the three sections, high-risk potential occurs in ship hull work, Delays in assembly/fabrication/erect processes, and machining work Delays in the Arrival of ME/AE/Pumps and Machine Equipment. The risk matrix indicates high-risk ratings for component delays in ship hull work, medium risk for machining work, and the low risk for electrical work and other components. The next step is to assess the potential of domestic components and design a component availability model for new shipbuilding, including imported components. This research offers valuable insights for RoRo ferry shipping stakeholders, helping them understand the mechanisms causing delays in new ship construction and guiding efforts to reduce the risk of failure.
{"title":"RISK ASSESSMENT OF NEW FERRY SHIP CONSTRUCTION IN INDONESIA USING THE FAILURE MODE EFFECT AND ANALYSIS (FMEA) METHOD","authors":"Z. Ariany, T. Pitana, I. Vanany","doi":"10.5937/jaes0-43711","DOIUrl":"https://doi.org/10.5937/jaes0-43711","url":null,"abstract":"This study aims to identify, calculate the impact rating, and mitigate the effects on new ferry construction in Indonesian shipyards. The Risk Matrix method and Failure Mode and Effect Analysis (FMEA) are employed to analyze risk levels. Data were collected through field observations and interviews regarding risks and potential delays in ship components. The results reveal 23 potential hazard sources, with two risks having the highest Risk Priority Number (RPN) values. Assessment based on the quality control section that causes delays in the arrival of ME/AE/pumps and other mechanical equipment 366.18. Assessment of the Project Leader process Delay in the assembly/fabrication/erect process 519.49. Part of production leadership Delay in assembly/fabrication/erecting processes 317.37. Based on the assessment of the three sections, high-risk potential occurs in ship hull work, Delays in assembly/fabrication/erect processes, and machining work Delays in the Arrival of ME/AE/Pumps and Machine Equipment. The risk matrix indicates high-risk ratings for component delays in ship hull work, medium risk for machining work, and the low risk for electrical work and other components. The next step is to assess the potential of domestic components and design a component availability model for new shipbuilding, including imported components. This research offers valuable insights for RoRo ferry shipping stakeholders, helping them understand the mechanisms causing delays in new ship construction and guiding efforts to reduce the risk of failure.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84724086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. D. Luong, Pham Tuong Minh Duong, Thi Bich Ngoc Nguyen, Nhu-Khoa Ngo, Thi Hoa Nguyen, Van Du Nguyen
In this study, a new finite element model for ultrasonic welding equipment is proposed. This help to solve remaining issues such as element type selection for the numerical model, mesh size, and how to determine the parameters of piezoelectric materials. The obtained results clearly show the influence of element type and mesh size on resonance frequency and amplitude. Specifically, with a mesh size of 2 mm, it was concluded to be suitable for the model. For the C3D8 element (C3D8E), the computation time is reduced by 0.25 times compared to the C3D20R element (C3D20RE). After that, an experimental processing procedure is performed to evaluate the numerical simulation results. Specifically, the handling of signal noise when measuring a very small displacement at high frequencies of an ultrasonic vibrating device. Based on the confirmed finite element model, this model is extended to evaluate the influence of the load on the amplitude and resonant frequency of the ultrasonic welding system. The results show that when the load increases, the amplitude decreases while the resonant frequency increases. The results of this study can be applied to the design of ultrasonic vibration systems.
{"title":"DYNAMIC RESPONSE OF HIGH-POWER ULTRASONIC SYSTEM BASED ON FINITE ELEMENT MODELING OF PIEZOELECTRIC","authors":"V. D. Luong, Pham Tuong Minh Duong, Thi Bich Ngoc Nguyen, Nhu-Khoa Ngo, Thi Hoa Nguyen, Van Du Nguyen","doi":"10.5937/jaes0-43529","DOIUrl":"https://doi.org/10.5937/jaes0-43529","url":null,"abstract":"In this study, a new finite element model for ultrasonic welding equipment is proposed. This help to solve remaining issues such as element type selection for the numerical model, mesh size, and how to determine the parameters of piezoelectric materials. The obtained results clearly show the influence of element type and mesh size on resonance frequency and amplitude. Specifically, with a mesh size of 2 mm, it was concluded to be suitable for the model. For the C3D8 element (C3D8E), the computation time is reduced by 0.25 times compared to the C3D20R element (C3D20RE). After that, an experimental processing procedure is performed to evaluate the numerical simulation results. Specifically, the handling of signal noise when measuring a very small displacement at high frequencies of an ultrasonic vibrating device. Based on the confirmed finite element model, this model is extended to evaluate the influence of the load on the amplitude and resonant frequency of the ultrasonic welding system. The results show that when the load increases, the amplitude decreases while the resonant frequency increases. The results of this study can be applied to the design of ultrasonic vibration systems.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89226720","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}
Oscar Manuel Duque Suárez, Antonio Lucas Mármol, J. A. Gomez Camperos
The research carried out resulted in the proposal to create a hybrid methodology between two topics such as RCM and PMBOK applied to the management of critical equipment maintenance in the biomedical area in health service providers (IPS) of medium complexity of the city of Cúcuta, Colombia. The hybrid methodology is based on a five-phase project structure, with overall management and tactical activities, deliverable documents for biomedical maintenance management (GMB) and more for GMB activity documentation, recommended tools and techniques for the implementation of activities, in addition to recommended guidelines and formats, where this was applied directly in four medium complexity Health Service Providers (IPS) Institutions of Cúcuta-Colombia, in which product of the professional and teaching experience of the author of this research with the design and execution of maintenance plans based on reliability for these institutions, are considered as case studies since they have the design basis of the RCM in three of them and the fourth is presented as a pilot where the hybrid model to be designed was implemented from scratch.
{"title":"RCM-PMBOK HYBRID METHODOLOGY FOR MANAGING THE MAINTENANCE OF CRITICAL BIOMEDICAL EQUIPMENT IN IPS OF MEDIUM COMPLEXITY","authors":"Oscar Manuel Duque Suárez, Antonio Lucas Mármol, J. A. Gomez Camperos","doi":"10.5937/jaes0-42211","DOIUrl":"https://doi.org/10.5937/jaes0-42211","url":null,"abstract":"The research carried out resulted in the proposal to create a hybrid methodology between two topics such as RCM and PMBOK applied to the management of critical equipment maintenance in the biomedical area in health service providers (IPS) of medium complexity of the city of Cúcuta, Colombia. The hybrid methodology is based on a five-phase project structure, with overall management and tactical activities, deliverable documents for biomedical maintenance management (GMB) and more for GMB activity documentation, recommended tools and techniques for the implementation of activities, in addition to recommended guidelines and formats, where this was applied directly in four medium complexity Health Service Providers (IPS) Institutions of Cúcuta-Colombia, in which product of the professional and teaching experience of the author of this research with the design and execution of maintenance plans based on reliability for these institutions, are considered as case studies since they have the design basis of the RCM in three of them and the fourth is presented as a pilot where the hybrid model to be designed was implemented from scratch. ","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81200999","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}
O. Nurzhanova, Olga Zharkevich, A. Bessonov, Y. Naboko, G. Abdugaliyeva, G. Taimanova, T. Nikonova
This article describes the process of modeling the restoration operations of the destroyed segment of the spline and its complete restoration using modern methods, such as hardfacing in a protective gas environment with a consumable electrode. The ANSYS Workbench 19.2 software with an additional Welding Distortion and Moving Heat Source extension was used to simulate the process of hardfacing a damaged surface. The thermomechanical behavior of the deposited layer on the outer surface of the splined shaft is analysed. Dependences of the value of temperature fields on the parameters of the hardfacing mode in one and two passes depending on time are established. Dependences of residual stresses (0.413 - 239 MPa) and deformations (0.02 - 0.23 mm) in the process of semi-automatic hardfacing are determined. Experimental studies of samples during hardfacing were carried out for comparison with the geometry of the weld during modeling. The simulation results are in good agreement with the experimental data.
{"title":"SIMULATION OF THE DISTRIBUTION OF TEMPERATURE, STRESSES AND DEFORMATIONS DURING SPLINED SHAFTS HARDFACING","authors":"O. Nurzhanova, Olga Zharkevich, A. Bessonov, Y. Naboko, G. Abdugaliyeva, G. Taimanova, T. Nikonova","doi":"10.5937/jaes0-42774","DOIUrl":"https://doi.org/10.5937/jaes0-42774","url":null,"abstract":"This article describes the process of modeling the restoration operations of the destroyed segment of the spline and its complete restoration using modern methods, such as hardfacing in a protective gas environment with a consumable electrode. The ANSYS Workbench 19.2 software with an additional Welding Distortion and Moving Heat Source extension was used to simulate the process of hardfacing a damaged surface. The thermomechanical behavior of the deposited layer on the outer surface of the splined shaft is analysed. Dependences of the value of temperature fields on the parameters of the hardfacing mode in one and two passes depending on time are established. Dependences of residual stresses (0.413 - 239 MPa) and deformations (0.02 - 0.23 mm) in the process of semi-automatic hardfacing are determined. Experimental studies of samples during hardfacing were carried out for comparison with the geometry of the weld during modeling. The simulation results are in good agreement with the experimental data.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82051897","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}
Sajid Abdullah Abdullah, Dr Hazim H. Abdulkadhum, S. Hamza
Friction Stir Processing is considered one of the important methods for improving the surfaces of polymeric materials by adding reinforcing particles in certain ratios to form a composite material with better surface properties than the properties of the base material. The Friction Stir Processing technique was employed in the present investigation to introduce graphite particles onto the polyvinyl chloride surface. Various volumetric ratios of 5, 8, 11, 14, 17, and 20% were used for the incorporation of graphite particles. Mechanical tests (flexural strength, hardness, and wear resistance) were carried out. The experiments demonstrated a noteworthy enhancement in the measured characteristics, with the most notable outcomes observed when the graphite content was increased by 20%. Consequently, this investigation determined that the application of the Friction Stir Processing technique effectively reinforced the polyvinyl chloride surface through the formation of a successful surface composite.
{"title":"IMPROVING THE WEAR RESISTANCE OF POLYVINYL CHLORIDE SURFACE BY USING THE FRICTION STIR PROCESSING TECHNIQUE","authors":"Sajid Abdullah Abdullah, Dr Hazim H. Abdulkadhum, S. Hamza","doi":"10.5937/jaes0-42436","DOIUrl":"https://doi.org/10.5937/jaes0-42436","url":null,"abstract":"Friction Stir Processing is considered one of the important methods for improving the surfaces of polymeric materials by adding reinforcing particles in certain ratios to form a composite material with better surface properties than the properties of the base material. The Friction Stir Processing technique was employed in the present investigation to introduce graphite particles onto the polyvinyl chloride surface. Various volumetric ratios of 5, 8, 11, 14, 17, and 20% were used for the incorporation of graphite particles. Mechanical tests (flexural strength, hardness, and wear resistance) were carried out. The experiments demonstrated a noteworthy enhancement in the measured characteristics, with the most notable outcomes observed when the graphite content was increased by 20%. Consequently, this investigation determined that the application of the Friction Stir Processing technique effectively reinforced the polyvinyl chloride surface through the formation of a successful surface composite.","PeriodicalId":35468,"journal":{"name":"Journal of Applied Engineering Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85239350","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}
Aldair Doria, Andrés Rodríguez Toscano, Rafael Ramírez Restrepo
In this paper, a computational fluid dynamic (CFD) model was developed to assess cavitation phenomenon and its local effects on a centrifugal pump. The model included the temperature of the fluid, rotational velocity, and geometric configuration of the suction. The model was validated using the pump characteristics curves of the manufacturer with an error of 5%. Also, the minimum pressure contours and the vapor volume fraction were plotted. These contours show the pump boundary conditions (temperature and angular velocity) before cavitation occurs. Thus, the impeller zone where the cavitation phenomenon is more susceptible to occurrence was identified. In addition, this analysis determined characteristic parameters such as the limit on fluid temperature, the limiting angular velocity of the pump and the ratio between the diameters of the suction pipe and the pump inlet diameter. The proposed methodology is aimed as a reference for the study of local operating parameters to avoid cavitation in various types of hydraulic pumps.
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