Log in

Relevant bibliographies by topics / Service life of components / Journal articles

To see the other types of publications on this topic, follow the link: Service life of components.

Journal articles on the topic 'Service life of components'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Service life of components.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Yang, Jian, and Mike P. Papazoglou. "Service components for managing the life-cycle of service compositions." Information Systems 29, no. 2 (April 2004): 97–125. http://dx.doi.org/10.1016/s0306-4379(03)00051-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Linins, Oskars, Ernests Jansons, Armands Leitans, Irina Boiko, and Janis Lungevics. "Estimation of Service Life of Mechanical Engineering Components." Key Engineering Materials 799 (April 2019): 71–76. http://dx.doi.org/10.4028/www.scientific.net/kem.799.71.

Full text

Abstract:

The paper is aimed to the methodology for estimation of service life of mechanical engineering components in the case of elastic-plastic contact of surfaces. Well-known calculation methods depending on physics, theory of probability, the analysis of friction pair’ shape and fit include a number of parameters that are difficult or even impossible to be technologically controlled in the manufacturing of mechanical engineering components. The new approach for wear rate estimation using surface texture parameters as well as physical-mechanical properties and geometric parameters of components is proposed. The theoretical part of the calculations is based on the 3D surface texture principles, the basics of material fatigue theory, the theory of elasticity and the contact mechanics of surfaces. It is possible to calculate the service time of the machine, but the process of running-in of the components is relatively short (less than 5%), therefore, the service time is mainly determined by a normal operating period, which also was used to evaluate this period. The calculated input parameters are technologically and metrologically available and new method for calculating the service time can be used in the design process of the equipment. The results of approbation of the method for estimation service time of mechanical engineering, which prove the applicability of mentioned method, are offered as well.

APA, Harvard, Vancouver, ISO, and other styles

3

Cole, Ivan, and Penny Corrigan. "Predicting the service life of buildings and components." Proceedings of the Institution of Civil Engineers - Construction Materials 164, no. 6 (December 2011): 305–14. http://dx.doi.org/10.1680/coma.2011.164.6.305.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Lee, Sanghyo, and Yonghan Ahn. "Analyzing the Long-Term Service Life of MEP Using the Probabilistic Approach in Residential Buildings." Sustainability 10, no. 10 (October 21, 2018): 3803. http://dx.doi.org/10.3390/su10103803.

Full text

Abstract:

Establishing an effective long-term maintenance plan is essential to ensure the sustainability of a building. Among the various components of a building, the mechanical, electrical, and plumbing (MEP) components are complexly affected by various parameters, such as quality and user pattern, with respect to the service life. Besides, these components are replaced at different points in time, which becomes one of the main risks when establishing a maintenance plan for the building. Therefore, it is very important to consider the uncertainty in calculating the service lives of MEP components in a systematic and reasonable way. This study aims to systemize the MEP components of residential buildings and analyze their service life patterns using a probabilistic approach for long-term maintenance planning. The analysis was performed on 54,318 maintenance cases from 1998 to 2017 at 65 twenty-five-year-old rental apartment buildings in South Korea. Before performing the analysis, a service life matrix was established by classifying the MEP components into 12 types and setting the service life time at 6–25 years. Then, the service life distribution was derived for each MEP component. The probabilistic approach can provide information for rational maintenance decision-making regarding each MEP component as well as basic service life settings. Since the performance of the MEP components deteriorates due to various reasons, de facto uncertainty exists in the service life of each component; thus, the probabilistic approach can serve as an important decision-making method. If probabilistic methods are developed by acquiring the cost data in addition to the frequency of maintenance activity used in this study, a more effective long-term maintenance plan can be established.

APA, Harvard, Vancouver, ISO, and other styles

5

(Gray)Byrd, L. G. "Service Life and Life of Service: The Maintenance Commitments." Transportation Research Record: Journal of the Transportation Research Board 1650, no. 1 (January 1998): 5–9. http://dx.doi.org/10.3141/1650-01.

Full text

Abstract:

The magnitude of today’s highway maintenance challenge, the impact of research on maintenance, basic objectives that should drive a maintenance program, and the progress made in meeting them over the last 4 decades are discussed. Highway maintenance should include the objectives of providing a consistently safe, comfortable, and efficient travel way for highway users and a safe environment for maintenance crews; providing optimum service life; maintaining as-built capacity and reliability; inviting, supporting, and using research and innovation; and performing with professionalism, competence, and diligence. Some of the challenges in meeting these objectives today are accelerating rates of deterioration, limited time available to work, complex interchanges and crowded rights-of-way, environmental restrictions, a litigious society, and public skepticism about all government functions. Three categories of responses are technologies, policies, and professionalism. A significant array of new, innovative tools and other products of research are making maintenance technology more effective. Maintenance managers need to be activists in promoting progressive policies in providing as-built capacity while performing maintenance and repair work and in procuring products and services. Maintenance policies should include recognition of user costs, use of performance specifications, fabrication of off-site repair components, design of repairable highway systems, use of corrosion-resistant materials, privatization of segments of the maintenance program, and establishment of an international maintenance technology reference program. Individual professionals must embrace continuing education, environmental sensitivity, community service, research and development, innovative management, and societal and political responsibilities.

APA, Harvard, Vancouver, ISO, and other styles

6

Dvorkin, E. M., and Ya I. Blyashko. "Increasing the service life of components of cryogenic machines." Chemical and Petroleum Engineering 23, no. 1 (January 1987): 39–41. http://dx.doi.org/10.1007/bf01150652.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Masters, Larry W. "Prediction of service life of building materials and components." Materials and Structures 19, no. 6 (November 1986): 417–22. http://dx.doi.org/10.1007/bf02472145.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Masters, Larry W., and Erik Brandt. "Prediction of service life of building materials and components." Materials and Structures 20, no. 1 (January 1987): 55–77. http://dx.doi.org/10.1007/bf02472728.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Janjua, Shahana, Prabir Sarker, and Wahidul Biswas. "Impact of Service Life on the Environmental Performance of Buildings." Buildings 9, no. 1 (January 2, 2019): 9. http://dx.doi.org/10.3390/buildings9010009.

Full text

Abstract:

The environmental performance assessment of the building and construction sector has been in discussion due to the increasing demand of facilities and its impact on the environment. The life cycle studies carried out over the last decade have mostly used an approximate life span of a building without considering the building component replacement requirements and their service life. This limitation results in unreliable outcomes and a huge volume of materials going to landfill. This study was performed to develop a relationship between the service life of a building and building components, and their impact on environmental performance. Twelve building combinations were modelled by considering two types of roof frames, two types of wall and three types of footings. A reference building of a 50-year service life was used in comparisons. Firstly, the service life of the building and building components and the replacement intervals of building components during active service life were estimated. The environmental life cycle assessment (ELCA) was carried out for all the buildings and results are presented on a yearly basis in order to study the impact of service life. The region-specific impact categories of cumulative energy demand, greenhouse gas emissions, water consumption and land use are used to assess the environmental performance of buildings. The analysis shows that the environmental performance of buildings is affected by the service life of a building and the replacement intervals of building components.

APA, Harvard, Vancouver, ISO, and other styles

10

Talon, A., D. Boissier, and J. Lair. "Service-life assessment of building components: application of evidence theory." Canadian Journal of Civil Engineering 35, no. 3 (March 2008): 287–300. http://dx.doi.org/10.1139/l07-109.

Full text

Abstract:

This paper deals with the assessment of the service life of in-service building components subjected to known environmental and usage conditions. This assessment is complex because of two primary features. First, the assessment has to be carried within a multiscale context: a geometric scale that ranges from the material or elemental to building scale; a range in the complexity of the degradation (phenomena that varies from a single phenomenon to the consideration of several degradation scenarios); a range of possible performance requirements, from one function to several; and consideration, as well, to the time over which the process is carried out that may span from the design stage to that of management and repair. Second, this assessment must also take into consideration the availability and features of service-life data that by nature is heterogeneous, imprecise, uncertain, and incomplete. In this context, a comprehensive methodology is developed using all available data on service life derived from existing methods of service-life assessment of materials, elements or building components. Such data may, for example, be extracted from fundamental studies on durability, accelerated short-term exposure tests, statistical methods, factorial methods, feedback from practice, or expert opinion or other sources. The main stages of this methodology are: (i) identification of all possible degradation scenarios provided by failure mode and effects analysis (FMEA); (ii) collection of all available service-life data (SL-data) associated with these degradation scenarios, transformation of this data into a fuzzy-set format, and assessment of its quality; (iii) processing of unification of data and aggregation of data; and (iv) assessment of the service life of building components. The case study of a window unit allows for: (i) service-life assessment of a building component to be processed by unification of data and aggregation of data and (ii) a conclusion to be deduced.

APA, Harvard, Vancouver, ISO, and other styles

11

Verma, Sanjeev Kumar, Sudhir Singh Bhadauria, and Saleem Akhtar. "Probabilistic Evaluation of Service Life for Reinforced Concrete Structures." Chinese Journal of Engineering 2014 (February 18, 2014): 1–8. http://dx.doi.org/10.1155/2014/648438.

Full text

Abstract:

Degradation of performance and deterioration of different components of reinforced concrete (RC) structures increase with the age of structure. This deterioration of reinforced component depends on several parameters. However, modeling service life of RC structure by considering all the parameters is a difficult job, as most of the parameters are uncertain in nature. Probabilistic models account well for the uncertainties in the parameters responsible for deterioration of RC structures. This paper presents a review of several recent service life models developed using probability based concepts.

APA, Harvard, Vancouver, ISO, and other styles

12

Shohet, Igal M., and Monica Paciuk. "Service life prediction of exterior cladding components under standard conditions." Construction Management and Economics 22, no. 10 (December 2004): 1081–90. http://dx.doi.org/10.1080/0144619042000213274.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Shohet, Igal M., and Monica Paciuk. "Service life prediction of exterior cladding components under failure conditions." Construction Management and Economics 24, no. 2 (February 2006): 131–48. http://dx.doi.org/10.1080/01446190500184535.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Aldajah, Saud Hamad, Mohammad Mazedul Kabir, and Mohammad Y. Al-Haik. "Accelerated Creep Life Assessment of In-Service Power Plant Components." MATEC Web of Conferences 293 (2019): 03001. http://dx.doi.org/10.1051/matecconf/201929303001.

Full text

Abstract:

Structural metals used in plant components are subject to aging from a combination of fatigue, creep, and corrosion. Exposure to elevated temperatures promotes creep. Aged metals lose toughness, or the ability to absorb energy at stress above the yield point and cannot endure an occasional high load without fracturing. Creep is one of the most critical factors for determining the structural integrity of components. The main objective of the current study is to assess the remaining creep life of various 20-year old power plant engineering components such as the high temperature fasteners. Due to time constraints, the approach followed in this study was to utilize the accelerated high temperature creep testing in addition to Scanning Electron Microscopy (SEM) analysis to assess the remaining life of 4 different samples. The accelerated high temperature creep tests were conducted at a stress level of 61 MPa and at a temperature of 1000°C for samples Sample 1 (original), Sample 2, Sample 3 and Sample 4; these samples were collected from different parts of the power plant. SEM analysis was carried out for all the samples. The results of the accelerated high temperature tests were compared to similar materials’ theoretical creep data using Larson Miller curve. The Larson Miller actual creep lives of the tested samples were much higher than the experimental ones, which suggest that the samples are critically aged. SEM analysis on the other hand, showed that all samples have high percentage of creep voids

APA, Harvard, Vancouver, ISO, and other styles

15

Kaming, Peter F., Desi Maryani, and Michael Boenardi. "Service life planning for electronics, mechanical and electrical components of a hotel building." MATEC Web of Conferences 195 (2018): 06010. http://dx.doi.org/10.1051/matecconf/201819506010.

Full text

Abstract:

A hotel building in Yogyakarta was studied for its service life planning of electronic, electrical, and mechanical components the building. The study aims to assess the service life of hotel buildings including its electronics, mechanical and electrical components, and estimating the service life of each of the components. Data was collected from practitioners working in building maintenance office of several hotels in Yogyakarta. The Data was carefully analysed using descriptive statistics. This paper discusses the approaches and application of the availability of reference service life and service period data can be collected and applied in life cycle costing. The results of service-life data for periodical maintenance and replacement for various electronics, both mechanical and electrical parts are also presented for life cycle planning.

APA, Harvard, Vancouver, ISO, and other styles

16

Kim, Hyo-Jin, and Jae-Jin Jung. "Model of Grain Deformation Method for Evaluation of Creep Life in In-Service Components." Journal of Engineering Materials and Technology 122, no. 1 (July 9, 1999): 56–59. http://dx.doi.org/10.1115/1.482765.

Full text

Abstract:

The creep life can be evaluated by the degree of grain deformation since the grains of Cr-Mo base material deform in the direction of stress. The grain deformation method using image-processing technique is developed for life assessment of in-service high temperature components. The new assessment model for the method is presented to apply to in-service components and is verified by interrupted creep test for ex-serviced material of 1Cr-0.5Mo steel. The proposed model, which is irrespective of stress direction, is to evaluate mean of the absolute deviation for the measured aspect ratios of the grains sections. [S0094-4289(00)00801-X]

APA, Harvard, Vancouver, ISO, and other styles

17

Simonen, Fredric A., and Stephen R. Gosselin. "Life Prediction and Monitoring of Nuclear Power Plant Components for Service-Related Degradation." Journal of Pressure Vessel Technology 123, no. 1 (October 23, 2000): 58–64. http://dx.doi.org/10.1115/1.1344237.

Full text

Abstract:

This paper describes industry programs to manage structural degradation and to justify continued operation of nuclear components when unexpected degradation has been encountered due to design materials and/or operational problems. Other issues have been related to operation of components beyond their original design life in cases where there is no evidence of fatigue crack initiation or other forms of structural degradation. Data from plant operating experience have been applied in combination with inservice inspections and degradation management programs to ensure that the degradation mechanisms do not adversely impact plant safety. Probabilistic fracture mechanics calculations are presented to demonstrate how component failure probabilities can be managed through augmented inservice inspection programs.

APA, Harvard, Vancouver, ISO, and other styles

18

Kim, Hyo-Jin. "Assessment of creep life fraction for in-service high-temperature components." Engineering Failure Analysis 12, no. 4 (August 2005): 578–85. http://dx.doi.org/10.1016/j.engfailanal.2004.09.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Fathoni, U., C. O. Rohayu, and C. M. Zakaria. "Environmental zoning for service life prediction of building components in Malaysia." IOP Conference Series: Earth and Environmental Science 16 (June 17, 2013): 012087. http://dx.doi.org/10.1088/1755-1315/16/1/012087.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Isakaev, E. Kh, V. B. Mordynskii, A. S. Tyuftyaev, Yu M. Avilkin, and V. A. Katarzhis. "Increasing the service life of rapidly wearing components of mud pumps." Welding International 26, no. 1 (January 2012): 40–44. http://dx.doi.org/10.1080/09507116.2011.592711.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Zaichenko, Yu A., A. Yu Mamykina, and A. N. Ferapontov. "Increasing the service life of railway engineering components by induction surfacing." Welding International 28, no. 3 (July 15, 2013): 248–50. http://dx.doi.org/10.1080/09507116.2013.796677.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Filonov, A. V., A. V. Kryukov, and M. I. Galimov. "Enhancing a service life of torch components for MIG/MAG welding." IOP Conference Series: Materials Science and Engineering 142 (August 2016): 012004. http://dx.doi.org/10.1088/1757-899x/142/1/012004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Masters, Larry W., and Erik Brandt. "Systematic methodology for service life prediction of building materials and components." Materials and Structures 22, no. 5 (September 1989): 385–92. http://dx.doi.org/10.1007/bf02472509.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Carlsson, B., K. Möller, M. Köhl, M. Heck, S. Brunold, U. Frei, J. C. Marechal, and G. Jorgensen. "The applicability of accelerated life testing for assessment of service life of solar thermal components." Solar Energy Materials and Solar Cells 84, no. 1-4 (October 2004): 255–74. http://dx.doi.org/10.1016/j.solmat.2004.01.046.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Denkena, B., P. Kuhlemann, B. Breidenstein, M. Keitel, and N. Vogel. "Influence of Turn-Rolling on the Residual Stresses and Microstructure of C45E and the Effects on Fatigue Life under Cyclic Loading." HTM Journal of Heat Treatment and Materials 76, no. 3 (June 1, 2021): 195–204. http://dx.doi.org/10.1515/htm-2021-0003.

Full text

Abstract:

Abstract The microstructure and the residual stress state have a significant influence on the service life of the component. The deep rolling process already enables a significant increase in the strength and service life of highly stressed components. By using the hybrid manufacturing process of turn rolling, the edge zone properties can be influenced to such an extent that the service life is further increased compared to conventional deep rolling. In addition to a change in the residual stress state, the use of the turning process temperature also leads to a significant grain refinement in the edge zone area, which has a positive effect on the component service life. This modification of the edge zone can be significantly influenced by the machining speed.

APA, Harvard, Vancouver, ISO, and other styles

26

Kumar, R. "Fatigue Life Estimation for Internal Threads in Class 1 Components." Journal of Pressure Vessel Technology 120, no. 1 (February 1, 1998): 81–85. http://dx.doi.org/10.1115/1.2841890.

Full text

Abstract:

Heat exchangers, steam generators, and other pressure vessels in nuclear power plants are equipped with bolted closures for the purpose of in-service inspection and maintenance. The ASME Boiler and Pressure Vessel Code specifies that all Class 1 components meet the fatigue life requirements for level A and B service conditions. In the case of bolted closures, it is often found that the bolt/stud is the most critical part. In many situations, the bolts fail to meet the fatigue requirements for the design life of the equipment. In such cases, the bolts can be replaced after certain duration based upon their fatigue life. However, the mating threads in the flange (which is an integral part of the vessel) are still a concern. While the replacement of the bolts is relatively easy and inexpensive, the corrective action (e.g., replacement or repair) for the flange is usually difficult and expensive, or impossible. Hence, it is important to have a reasonable estimate of the fatigue life of internal threads to alleviate or minimize the concern. In this paper, a simplified approach is presented for this purpose. Considering various bolt sizes, commonly used thread series, and typical Class 1 component materials, it is shown that the fatigue life of the internal threads is about three times the fatigue life of the bolt threads. This conclusion greatly reduces or eliminates the concern for in-service replacement or repair of the components with internal threads.

APA, Harvard, Vancouver, ISO, and other styles

27

Rudbeck, Claus. "Service life of building envelope components: making it operational in economical assessment." Construction and Building Materials 16, no. 2 (March 2002): 83–89. http://dx.doi.org/10.1016/s0950-0618(02)00003-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Loli, A., C. Bertolin, and L. Kotova. "Service life prediction of building components in the times of climate change." IOP Conference Series: Materials Science and Engineering 949 (November 11, 2020): 012048. http://dx.doi.org/10.1088/1757-899x/949/1/012048.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Ozaltun, H., M. H. H. Shen, T. George, and C. Cross. "An Energy Based Fatigue Life Prediction Framework for In-Service Structural Components." Experimental Mechanics 51, no. 5 (May 25, 2010): 707–18. http://dx.doi.org/10.1007/s11340-010-9365-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Romsaiyud, Walisa, and Wichian Premchaiswadi. "Adaptive Multi-Services System for Maternal and Child Health Care on Mobile Application (AM-Care)." International Journal of Healthcare Information Systems and Informatics 5, no. 3 (July 2010): 27–43. http://dx.doi.org/10.4018/jhisi.2010070103.

Full text

Abstract:

Addressing efforts towards the improvement of maternal and child health management can often prove to be problematic in context to successfully obtaining healthcare and medical treatment information from health care professionals. In this regard, the authors propose an adaptive multi-service system that contains fully integrated health care services, medical treatment services, and maternal and child health management. The system utilized both web-based and mobile technology for implementing the application. A practical framework for generating individual maternal and child health care is also presented from data repositories and fully integrated functional health care services to support an improved quality of life for both mother and children. The application, namely AM-Care, consists of the three main components, i.e., Control Centre Component, Web-based Components, and Mobile Components. Also, AM-Care has the important add-on features such as emergency services and warning services.

APA, Harvard, Vancouver, ISO, and other styles

31

IDZIASZEK, Zdzisław. "An Ordnance Reliability and Life Model for the Estimation of the Component Kits in Preventive Replacement in Terms of Production and Operating Costs." Problems of Mechatronics Armament Aviation Safety Engineering 10, no. 2 (June 30, 2019): 103–29. http://dx.doi.org/10.5604/01.3001.0013.2119.

Full text

Abstract:

This paper presents an outline of a method of optimising the service life of aircraft guns at the stage of design engineering and retrofitting. The essence of this method is a selection of service lives and quantities of preventively replaced components and the service parts of non-reconditionable components resulting in an overall reduction of gun production and operating costs (including the costs of replacement parts stocks) with an improvement of the service life of the whole gun assembly. The method assumes that the service lives to be selected must meet a criterion of predefined reliability, maximum service availability when installed aboard a combat platform (i.e. an aircraft) and the minimum time to re-use. It is pointed out that in the design engineering of preventive component replacement and the assessment of the gun selection, a criterion of total gun cost reduction shall apply; the total gun cost is construed as the cost of production/purchase and maintenance applicable to the operating mode (with the costs and time to provide replacement parts). The total gun cost should be decisive in the definition of service lives and the number of components in preventive replacement. To analyse and select the service life and the MTBR (Mean Time Between Replacements), examples of reliability and life models of guns were developed in reference to the applicable operating standards and changes in total costs. This was followed by a demonstration of an innovative model of mapping gun (production/purchase and operating) costs with a complex number plane. The method presented herein facilitates analysing and assessing the feasibility for improvement of a gun’s availability in combat field and training operations.

APA, Harvard, Vancouver, ISO, and other styles

32

Babris, Kristaps, Oksana Nikiforova, and Uldis Sukovskis. "Brief Overview of Modelling Methods, Life-Cycle and Application Domains of Cyber-Physical Systems." Applied Computer Systems 24, no. 1 (May 1, 2019): 1–8. http://dx.doi.org/10.2478/acss-2019-0001.

Full text

Abstract:

Abstract Cyber-Physical Systems (CPSs) are systems that connect the physical world with the virtual world of information processing. They consist of various components that work together to create some global behaviour. These components include software systems, communication technologies and sensors, executive mechanisms that interact with the real world, often including embedded technologies. One CPS may include a variety of components from different manufacturers or service providers, often without even knowing that their products and services are integrated with others as a result of CPS. This paper systematises information about CPS modelling methods and domains and presents the CPS modelling cycle – from abstraction to architecture and from concept to realisation.

APA, Harvard, Vancouver, ISO, and other styles

33

Arvanitis, S. T., Y. B. Symko, and R. N. Tadros. "Multiaxial Life Prediction System for Turbine Components." Journal of Engineering for Gas Turbines and Power 109, no. 1 (January 1, 1987): 107–14. http://dx.doi.org/10.1115/1.3239997.

Full text

Abstract:

The objective of this paper is to present a complete three-dimensional life prediction system which was developed for turbine engine components. It will deal primarily with turbine blades and vanes which are subjected to hostile thermal and combustion environments under load which creates cyclic and/or steady multiaxial stress and strain fields. All of the above factors combined are detrimental to the service life of these components and need very careful consideration at the design stage. The developed multiaxial system for a mission includes evaluation of transient metal temperatures, corresponding elastic and inelastic strains, creep strains, and subsequently creep/fatigue lives. The calculations are performed using the ductility exhaustion method. The maximum principal normal strain ranges used in the life analysis are found by a developed procedure for a multiaxial system. The concept is based on analyzing all of the time steps computed in the mission, in order to develop the maximum principal normal strain range whose direction and magnitude is strictly a function of the component geometry and mission loading. The mission creep is then developed by maximizing a cumulative creep function. Directional consistency is maintained in accumulating creep/fatigue damage with respect to the incurred multiaxial stress and strain fields. Also the most damaging mission modes (creep or fatigue) will be separated. Further development in the model includes the capability of analytically obtaining the fatigue curve for any ratio R of minimum to maximum strain using baseline fatigue material properties (R = −1.0). Application of the model to an actual uncooled vane correlates well with test rig development experience.

APA, Harvard, Vancouver, ISO, and other styles

34

Cunha, F. J., M. T. Dahmer, and M. K. Chyu. "Thermal-Mechanical Life Prediction System for Anisotropic Turbine Components." Journal of Turbomachinery 128, no. 2 (February 1, 2005): 240–50. http://dx.doi.org/10.1115/1.2137740.

Full text

Abstract:

Modern gas turbine engines provide large amounts of thrust and withstand severe thermal-mechanical conditions during the load and mission operations characterized by cyclic transients and long dwell times. All these operational factors can be detrimental to the service life of turbine components and need careful consideration. Engine components subject to the harshest environments are turbine high-pressure vanes and rotating blades. Therefore, it is necessary to develop a turbine component three-dimensional life prediction system, which accounts for mission transients, anisotropic material properties, and multi-axial, thermal-mechanical, strain, and stress fields. This paper presents a complete life prediction approach for either commercial missions or more complex military missions, which includes evaluation of component transient metal temperatures, resolved maximum shear stresses and strains, and subsequent component life capability for fatigue and creep damage. The procedure is based on considering all of the time steps in the mission profile by developing a series of extreme points that envelop every point in the mission. Creep damage is factored into the component capability by debiting thermal-mechanical accumulated cycles using the traditional Miner’s rule for accumulated fatigue and creep damage. Application of this methodology is illustrated to the design of the NASA Energy Efficient Engine (E3) high pressure turbine blade with operational load shakedown leading to stress relaxation on the external hot surfaces and potential state of overstress in the inner cold rib regions of the airfoil.

APA, Harvard, Vancouver, ISO, and other styles

35

Držka, Milan. "Analysis of Effects Influencing Protruding Building Components." Advanced Materials Research 855 (December 2013): 11–14. http://dx.doi.org/10.4028/www.scientific.net/amr.855.11.

Full text

Abstract:

The article deals with analysis of effects influencing projected constructional buildings (i.e. balconies) during their service life. The stress is laid on chemical factors having impact on carbonization and corrosion of main bars in reinforced concrete structural systems of balconies.

APA, Harvard, Vancouver, ISO, and other styles

36

Park, Soyeon, Yonghan Ahn, and Sanghyo Lee. "Analyzing the Finishing Works Service Life Pattern of Public Housing in South Korea by Probabilistic Approach." Sustainability 10, no. 12 (November 28, 2018): 4469. http://dx.doi.org/10.3390/su10124469.

Full text

Abstract:

Over recent decades, it has become essential to establish preventive long-term maintenance plans for public housing developments. Also, deterministic maintenance strategies have been increasingly replaced by those based on reliability and risk, which are probabilistic. Efforts to obtain optimized long-term maintenance plans have included management of service life and prediction of service lifetime. Accordingly, the present research develops a system for various finishing works of public housing and analyzes the service life pattern of each component using a probabilistic approach. For the analysis, this research analyzed 46,201 South Korean public housing maintenance records from the last 21 years and determined the maintenance frequency distribution. The purpose of the research is to suggest efficient long-term maintenance plans using the analyzed results of service life patterns. Results from the analysis showed that each component has a different service life pattern that can be applied to establish the service lifetime and decision making for floating maintenance. Since the interaction between finishing works is affected due to various components and parameters, the results are useful to reduce the uncertainty and risk of deterministic maintenance plans. The meaning of this research is to analyze the service life pattern using a probabilistic approach and recommend how to establish an efficient maintenance system.

APA, Harvard, Vancouver, ISO, and other styles

37

Geras'kin, V. V., S. L. Baldaev, A. F. Puzryakov, and L. Kh Baldaev. "Increasing the service life of components by gas thermal spraying of nanostructured materials." Welding International 25, no. 3 (March 2011): 221–23. http://dx.doi.org/10.1080/09507116.2010.540876.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Senchenkov, I. K., O. P. Chervinko, I. A. Ryabtsev, and A. A. Babinets. "Determination of the service life of hardfaced components under thermal and cyclic loading." Welding International 28, no. 1 (August 19, 2013): 80–84. http://dx.doi.org/10.1080/09507116.2013.796661.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Martinella, R. "Selection and application of wear-resistant materials to increase service life of components." Ceramics International 19, no. 6 (January 1993): 375–89. http://dx.doi.org/10.1016/0272-8842(93)90027-o.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Brischke, Christian, Linda Meyer, Thomas Bornemann, Maik Bilstein, Boris Lauenstein, Janna-Marcia Lück, and Christian Wulf. "Service life of timber components: prognosis based on 3 years high-frequency monitoring." European Journal of Wood and Wood Products 71, no. 1 (October 26, 2012): 79–90. http://dx.doi.org/10.1007/s00107-012-0640-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Roux, Paul, Christine Passerieux, and Marie-Josée Fleury. "Mediation analysis of severity of needs, service performance and outcomes for patients with mental disorders." British Journal of Psychiatry 209, no. 6 (December 2016): 511–16. http://dx.doi.org/10.1192/bjp.bp.116.184010.

Full text

Abstract:

BackgroundNeeds and service performance assessment are key components in improving recovery among individuals with mental disorders.AimsTo test the role of service performance as a mediating factor between severity of patients' needs and outcomes.MethodA total of 339 adults with mental disorders were interviewed. A mediation analysis between severity of needs, service performance (adequacy of help, continuity of care and recovery orientation of services) and outcomes (personal recovery and quality of life) was carried out using structural equation modelling.ResultsThe structural equation model provided a good fit with the data. An increase in needs was associated with lower service performance and worse outcomes, whereas higher service performance was associated with better outcomes. Service performance partially mediated the effect of patient needs on outcomes.ConclusionsPoorer service performance has a negative impact on outcomes for patients with the highest needs. Ensuring more efficient services for patients with high needs may help improve their recovery and quality of life.

APA, Harvard, Vancouver, ISO, and other styles

42

Okechukwu, C., O. A. Dahunsi, P. K. Oke, I. O. Oladele, and M. Dauda. "Review on hardfacing as method of improving the service life of critical components subjected to wear in service." Nigerian Journal of Technology 36, no. 4 (January 15, 2018): 1095. http://dx.doi.org/10.4314/njt.v36i4.15.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Kashi, Sima, Mandy De Souza, Salwan Al-Assafi, and Russell Varley. "Understanding the Effects of In-Service Temperature and Functional Fluid on the Ageing of Silicone Rubber." Polymers 11, no. 3 (February 26, 2019): 388. http://dx.doi.org/10.3390/polym11030388.

Full text

Abstract:

With an organic/inorganic hybrid nature, silicone elastomers are amongst the most versatile engineering materials, exploited in a wide range of applications either as end-products or in manufacturing processes. In many industrial machines, silicone components are exposed to in-service conditions, such as high or low temperatures, contact with functional fluids, mechanical loading, and deformations, which can adversely affect these components and reduce their lifespan, leading to machine failure in turn. The present study investigates the behaviour of a silicone component of a manufacturing equipment and the variations in the part’s properties due to in-service conditions (temperature, exposure to heat transfer fluid, and mechanical deformation) to develop a monitoring tool. An experimental design was employed to study the main and the interaction effects of temperature (22 °C, 180 °C), medium (air, synthetic heat transfer fluid), and strain (0%, 200%) on the silicone component’s properties. Results showed that while the chemistry of the component remains intact, its thermal and in particular mechanical properties are largely influenced by the in-service conditions. Consequently, leading to a physical rather than a chemical failure of the component and limiting its service life. Statistical analysis revealed that high temperature and the exposure to the heat transfer fluid have the most sever effects. Moreover, these two manufacturing parameters were found to have a significant interaction with one another, whose effect cannot not be neglected.

APA, Harvard, Vancouver, ISO, and other styles

44

Cluff, Kevin, and Donald Barker. "Tailoring Temperature/Humidity Life Tests with In-Service Environment Data." Journal of the IEST 41, no. 4 (July 19, 1998): 36–42. http://dx.doi.org/10.17764/jiet.41.4.y051528h6r20j646.

Full text

Abstract:

Humidity combined with temperature and voltage is considered a major failure stimulus in electronic components, printed wiring boards, and assemblies. Accelerated temperature/humidity tests are commonly used to evaluate the moisture resistance of electronics, but these are rarely linked to the application environment. This work proposes a methodology to determine realistic tests based on measured usage environments. Plastic encapsulated microcircuits in the commercial airplane environment will be used to demonstrate the approach.

APA, Harvard, Vancouver, ISO, and other styles

45

Schneider, Jannik Alexander, Johanna Wurst, Ines Gruetzmann, Iryna Mozgova, and Roland Lachmayer. "IMPLEMENTATION OF MAINTENANCE STRATEGIES IN THE LIFE CYCLE COSTING OF PRODUCT-SERVICE SYSTEMS." Proceedings of the Design Society 1 (July 27, 2021): 1827–36. http://dx.doi.org/10.1017/pds.2021.444.

Full text

Abstract:

AbstractEstimating the costs of products during development to design a cost efficent product is a well established process. But in the case of Product-Service Systems estimating the costs of the individual product is not sufficent. Instead it is necessary to calculate the cost incured over the entire life cycle of the product. Because with Product-Service Systems the majority of costs is not incurred during manufacturing of the product but instead during the operation. One of the major cost components accruing during the operation of the product are the maintennace costs. Therefore, current life cycle costing models show the impoact of component design on the maintennace cost of the Product-Service System. But they do not show how different maintennace strategies that can have an impact on the overall life cycle costs of the Product-Service System. Thus, this paper shows a method for the implementation of different maintennace strategies into life cycle costing and applies it in an industrial use case.

APA, Harvard, Vancouver, ISO, and other styles

46

Tapping, R. L., Y. C. Lu, D. S. Mancey, and Z. H. Walker. "Assessing Long-Term Performance of CANDU® Out-of-Core Materials." AECL Nuclear Review 1, no. 1 (June 1, 2012): 5–11. http://dx.doi.org/10.12943/anr.2012.00002.

Full text

Abstract:

As so-called second-generation power reactors are approaching the end of their original design lives, assessments are being made to determine the feasibility and economics of extending plant life. Although components exposed to neutron and gamma irradiation are often those of most concern in terms of in-service ageing and continued fitness for service, ageing of out-of-core components can also limit the possibility of extended service life beyond design life. In CANDU® reactors, life extension decisions occur when the Zr-2.5Nb pressure tubes reach end of life, typically after about 25 years of service for the first CANDU-6 units. At the time of pressure tube replacements, the remaining life predictions for several other major components or systems provide the information required to determine life extension feasibility. Several CANDU reactors are currently being refurbished, with others planned, and experience to date shows that the steam generators, heat transport system piping and various balance of plant piping systems are typically those requiring careful assessment to ensure successful refurbishment. In this paper, we discuss AECL R&D that is oriented towards providing the chemistry and materials inputs required to assess current condition and predict future ageing of CANDU reactor out-of-core components and systems, and in particular steam generators (Alloy 800 tubing and carbon steel internals), feeder pipes and related heat transport system piping (carbon steel flow accelerated corrosion, feeder cracking). Systems and components that may impact future life will also be discussed, along with the related R&D, and this includes balance of plant system piping (feedwater piping and buried piping), cables and concrete structures.

APA, Harvard, Vancouver, ISO, and other styles

47

Voronov, A. N. "Algorithm for evaluating agricultural machinery component service life." Machinery and Equipment for Rural Area, no. 6 (June 26, 2020): 40–44. http://dx.doi.org/10.33267/2072-9642-2020-6-40-44.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Xuebin Zhao, linfeng Zhao, and Boyd Louis. "Analysis on Service Life of Hot-end Components of Gas Turbine Using Equivalent Operation." International Journal of Advancements in Computing Technology 5, no. 4 (February 28, 2013): 975–80. http://dx.doi.org/10.4156/ijact.vol5.issue4.118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Safonov, G. P., P. V. Vorob’ev, A. M. Sorokin, and A. V. Buldakov. "Extending the service life of insulation systems through the use of chemically active components." Russian Electrical Engineering 78, no. 3 (March 2007): 156–60. http://dx.doi.org/10.3103/s1068371207030121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Haque, Md Nazmul, Irtija Alam, and Atif Aninda Rahman. "Assessment of Ecosystem Services and Disservices in Urban Environment Using Multispectral Image Analysis and Geospatial Mapping." MIST INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY 9 (June 27, 2021): 55–65. http://dx.doi.org/10.47981/j.mijst.09(01)2021.284(55-65).

Full text

Abstract:

Ecosystem service and disservice components have a great impact on the environment as well as on urban life. The aim of the research is to assess the impact of ecosystem services and disservices by tracking the change over a span of 15 years (2005-2020) using satellite image analysis. It was conducted in wards 23 and 29 of Khulna City Corporation (KCC), an area adjacent to the river. The overall work breakdown has been rounded up in a methodological framework which cleaved into two parts focusing on ecosystem services, disservices and multispectral image analysis steps. Multispectral image analysis has been done using Normalized Difference Vegetation Index (NDVI) and Normalized Difference Build-up Index (NDBI). On the other hand, geospatial analysis has been done using Digital Elevation Model (DEM), Service Area Analysis (SAV) and other mapping tool including Geographic Information System (GIS) to show the changed impact of both ecosystem components. The study areas attain provisioning, habitat, cultural and regulatory service components and the disservice elements have been sorted out according to sources. Comparative study showed increase in the buildup area; vegetation coverage because of increasing vegetation, cultivation and gardening practices; good weather and water circulation condition and water body conservation which has significant positive impact on the area. The disservice component like poor drainage condition and solid waste management system and risky infrastructures have negative impact, need to address for the betterment of residence and environment.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!