Analysis of Factors Affecting the Service Life of a Centripetal Turbine Rotor

2017 ◽  
Vol 60 (4) ◽  
pp. 621-626
Author(s):  
V. A. Trushin
Keyword(s):  
Service Life ◽  
Turbine Rotor ◽  
Factors Affecting ◽  
Centripetal Turbine

scholarly journals Early-Age Cracking in Concrete: Causes, Consequences, Remedial Measures, and Recommendations

2018 ◽  
Vol 8 (10) ◽  
pp. 1730 ◽  
Author(s):  
Md. Safiuddin ◽  
A. Kaish ◽  
Chin-Ong Woon ◽  
Sudharshan Raman
Keyword(s):  
Service Life ◽  
Concrete Structures ◽  
Real Life ◽  
Early Age ◽  
Structural Elements ◽  
Remedial Measures ◽  
Curing Conditions ◽  
Factors Affecting ◽  
Different Types ◽  
Service Conditions

Cracking is a common problem in concrete structures in real-life service conditions. In fact, crack-free concrete structures are very rare to find in real world. Concrete can undergo early-age cracking depending on the mix composition, exposure environment, hydration rate, and curing conditions. Understanding the causes and consequences of cracking thoroughly is essential for selecting proper measures to resolve the early-age cracking problem in concrete. This paper will help to identify the major causes and consequences of the early-age cracking in concrete. Also, this paper will be useful to adopt effective remedial measures for reducing or eliminating the early-age cracking problem in concrete. Different types of early-age crack, the factors affecting the initiation and growth of early-age cracks, the causes of early-age cracking, and the modeling of early-age cracking are discussed in this paper. A number of examples for various early-age cracking problems of concrete found in different structural elements are also shown. Above all, some recommendations are given for minimizing the early-age cracking in concrete. It is hoped that the information conveyed in this paper will be beneficial to improve the service life of concrete structures. Concrete researchers and practitioners may benefit from the contents of this paper.

scholarly journals The Performance of Wood Decking after Five Years of Exposure: Verification of the Combined Effect of Wetting Ability and Durability

Forests ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 903 ◽  
Author(s):  
Miha Humar ◽  
Davor Kržišnik ◽  
Boštjan Lesar ◽  
Christian Brischke
Keyword(s):  
Service Life ◽  
Synergistic Effects ◽  
Construction Materials ◽  
Exposure Dose ◽  
Decay Rates ◽  
Water Repellent ◽  
Factors Affecting ◽  
Wetting Ability ◽  
Two Factors ◽  
Moisture Performance

Wood is one of the most important construction materials, and its use in building applications has increased in recent decades. In order to enable even more extensive and reliable use of wood, we need to understand the factors affecting wood’s service life. A new concept for characterizing the durability of wood-based materials and for predicting the service life of wood has recently been proposed, based on material-inherent protective properties, moisture performance, and the climate- and design-induced exposure dose of wooden structures. This approach was validated on the decking of a model house in Ljubljana that was constructed in October 2013. The decay and moisture content of decking elements were regularly monitored. In addition, the resistance dose DRd, as the product of the critical dose Dcrit, and two factors taking into account the wetting ability of wood (kwa) and its inherent durability (kinh), were determined in the laboratory. DRd correlated well with the decay rates of the decking of the model house. Furthermore, the positive effect of thermal modification and water-repellent treatments on the outdoor performance of the examined materials was evident, as well as the synergistic effects between moisture performance and inherent durability.

scholarly journals Prediction analysis of the degradation and the service life building components in artificial method neural network and ISO factor 15686-2

2019 ◽  
Vol 258 ◽  
pp. 03017
Author(s):  
Siti Aisyah ◽  
Akhmad Aminullah ◽  
H. Muslikh
Keyword(s):  
Neural Network ◽  
Service Life ◽  
Predictive Analysis ◽  
Calculation Formula ◽  
Factors Affecting ◽  
Life Planning ◽  
Close Relationship ◽  
Building Components ◽  
Input Variables ◽  
Building Condition

The research study reported in this paper aims to combine the Artificial Neural Networks with ISO 15686 Buildings and constructed assets - Service life planning, a framework-based approach to offering a more reliable deterioration forecasting more reliable for building. This paper discusses the existing data and develop a close relationship definition between factors affecting the condition of the service life of the building, the value of building condition and determine the level of degradation of the building component, also predicted the age of the building components in accordance with a specific time variables. Data examination conducted in this research is building condition data of student dormitory at the Universitas Gadjah Mada, the data will be used to calibrate the model of damage to consider a number of factors that influence. To help demonstrate the concept, factors affecting the decline is considered in the analysis of the design level, the level of implementation of the work, the indoor environment, the external environment, the level of care and conditions of use. Predictive analysis with artificial methods of neural network (ANN) with ISO factor input variables and factors age of the building components and the severity level of degradation of the building components (Sw) as output, this will generate a calculation formula that shows the effect of each variable input to output. Predictive analysis carried out with the reverse approach in which after calculation formula obtained by ANN method, then the next step is to find the value of the variable age of the building components according to the value of degradation that has been determined.

Research on the Electrolyte Service Life of Treating AZ91D by Micro Arc Oxidation

2011 ◽  
Vol 464 ◽  
pp. 1-4
Author(s):  
Ming Qiang Pan ◽  
Shi Chun Di ◽  
Tao Chen ◽  
Li Guo Chen ◽  
Zhen Hua Wang
Keyword(s):  
Service Life ◽  
Working Time ◽  
Active State ◽  
Critical Factors ◽  
Factors Affecting ◽  
Initial Voltage ◽  
Micro Arc Oxidation ◽  
Curve Extension ◽  
Solution Volume

With the development of micro arc oxidation and the growing maturity of the industrialization, the electrolyte service life and stability attract more and more people. In this paper, the electrolyte service life was researched. Under the same technological conditions, it was found that the critical factors affecting the electrolyte service life are the single-processing area and the electrolyte volume. With prolonging the working time of the electrolyte, the gel deposition mass in the electrolyte and the initial voltage always change. The experiment indicates that the electrolyte service life will assume the curve extension when reducing the single-processing area or increasing the solution volume. To some extent, the initial voltage and gel deposition can indicate the active state of the electrolyte, and can be considered as the sign whether the electrolyte service life becomes due.

Local Laser Bionic Blocking Experimental Study of Hot Work Mould Surface Cracks

2012 ◽  
Vol 201-202 ◽  
pp. 491-494
Author(s):  
Kui Peng Zhao ◽  
Li Jun Liu ◽  
Xue Chang Zhang ◽  
Zhi Xin Jia ◽  
Ji Qiang Li ◽  
...  
Keyword(s):  
Service Life ◽  
Economic Benefits ◽  
Surface Integral ◽  
Laser Melting ◽  
Factors Affecting ◽  
Thermal Fatigue Crack ◽  
Mould Surface ◽  
Hot Work Die ◽  
Laser Transformation Hardening ◽  
Mold Life

For the short life of hot work die in enterprise directly caused problems the waste of resources and the rising cost of production. Based on studying the biological prototype of crack-resistance of plant lamina and found that surface thermal fatigue crack is one of the main factors affecting the service life of hot work mould, it is put forward thoughts about the local bionic laser melting on mould surface to block cracks. Different from the traditional mould surface integral laser transformation hardening (LTH) technology, using laser melting simulating plant lamina to block cracks on the partial surface of mold, life of bionic strengthened die is improved within 1~1.5 times. Experiment results show that a new method is provided to improve the service life of casting mould and promoting this technology will bring significant economic benefits for the mould industry.

scholarly journals Optimizing the Microstructure and Corrosion Resistance of BDD Coating to Improve the Service Life of Ti/BDD Coated Electrode

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3188 ◽  
Author(s):  
Xin ru Lu ◽  
Ming hui Ding ◽  
Lu Zhang ◽  
Zhi liang Yang ◽  
Yao Lu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Service Life ◽  
Chemical Vapor ◽  
Structural Defects ◽  
Electrolysis Condition ◽  
Factors Affecting ◽  
Plasma Chemical Vapor Deposition ◽  
Coated Electrode ◽  
Short Service Life ◽  
Coated Electrodes

The short service life of the Ti/BDD coated electrode is the main reason that limits its practical use. In this paper, the effect of structural change on the service life was studied using Ti/BDD coated electrodes prepared with the arc plasma chemical vapor deposition (CVD) method. It was found that the microstructural defects and corrosion resistance of BDD coatings were the main factors affecting the electrode service life. By optimizing the process parameters in different deposition stages, reducing the structural defects and improving the corrosion resistance of the BDD coating were conducted successfully, which increased the service life of the Ti/BDD coated electrodes significantly. The lifetime of the Ti/BDD samples increased from 360 h to 655 h under the electrolysis condition with a current density of 0.5 A/cm2, with an increase of 82%.

Sign in / Sign up

Export Citation Format

Share Document