• Title/Summary/Keyword: material evaluation

Search Result 5,388, Processing Time 0.035 seconds

Non-Destructive Evaluation for Material of Thermal Barrier Coatings (단열 코팅재료의 비파괴 평가기법)

  • Lee Chul-Ku;Kim Tae-Hyung
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.14 no.1
    • /
    • pp.44-51
    • /
    • 2005
  • Material degradation is a multibillion-dollar problem which affects all the industries amongst others. The last decades have seen the development of newer and more effective techniques such as Focused-ion beam(FIB), Transmission electron microscopy(TEM), Secondary-ion mass spectroscopy(SIMS), auger electron spectroscopy(AES), X-ray Photoelectron spectroscopy(XPS) , Electrochemical impedance spectroscopy(EIS), Photo- stimulated luminescence spectroscopy(PSLS), etc. to study various forms of material degradation. These techniques are now used routinely to obtain information on the chemical state, depth profiling, composition, stress state, etc. to understand the degradation behavior. This paper describes the use of these techniques specifically applied to materials degradation and failure analysis.

Study on Optimization of Dissimilar Friction Welding of Nuclear Power Plant Materials and Its Real Time AE Evaluation (원자력 발전소용 이종재 마찰용접의 최적화와 AE에 의한 실시간 평가에 관한 연구)

  • 권상우;오세규;유인종;황성필;공유식
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2000.10a
    • /
    • pp.42-46
    • /
    • 2000
  • In this paper, joints of Cu-1Cr-0.1Zr alloy to STS316L were performed by friction welding method. Cu-1Cr-0.1Zr alloy is attractive candidate as nuclear power plant material and exibit the best combination of high sts good electrical and thermal conductivity of any copper alloy examined. The stainless steel is a structural material who alloy acts as a heat sink material for the surface heat flux in the first wall. So, in this paper, not only the develop optimizing of friction welding with more reliability and more applicabililty but also the development of in-process rear quility(such as strength and toughness) evaluation technique by acoustic emission for friction welding of such nuclear component of Cu-1Cr-0.1Zr alloy to STS316L steel were performed.

  • PDF

Finite Element Analysis and Evaluation of Rubber Spring for Railway Vehicle (철도차량용 고무스프링 특성해석 및 평가)

  • Woo, Chang-Su;Kim, Wan-Doo;Choi, Byung-Ik;Park, Hyun-Sung;Kim, Kyung-Sik
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.33 no.8
    • /
    • pp.773-778
    • /
    • 2009
  • Chevron rubber springs are used in primary suspensions for rail vehicle. Chevron rubber spring have function which reduce vibration and noise, support load carried in operation of rail vehicle. Prediction and evaluation of characteristics are very important in design procedure to assure the safety and reliability of the rubber spring. The computer simulation using the nonlinear finite element analysis program executed to predict and evaluate the load capacity and stiffness for the chevron spring. The non-linear properties of rubber which are described as strain energy functions are important parameters. These are determined by material tests which are uniaxial tension, equi-biaxial tension and shear test. The appropriate shape and material properties are proposed to adjust the required characteristics of rubber springs in the three modes of flexibility.

A Numerical Approach to Indentation Techniques for Thin-film Property Evaluation (박막 물성평가 압입시험의 수치접근법)

  • Lee, Jin-Haeng;Yu, Han-Suk;Lee, Hyung-Yil
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.31 no.3 s.258
    • /
    • pp.313-321
    • /
    • 2007
  • In this work, the prior indentation theory for a bulk material is extended to an indentation theory for evaluation of thin-film material properties. We first select the optimal data acquisition location, where the strain gradient is the least and the effect of friction is negligible. A new numerical approach to the thin-film indentation technique is then proposed by examining the finite element solutions at the optimal point. With this new approach, from the load-depth curve, we obtain the values of Young's modulus, yield strength, strain-hardening exponent. The average errors of those values are less than 3, 5, 8% respectively.

An Assessment on Environment Friendliness of National Park Facilities in Korea (국립공원 시설의 친환경성 평가)

  • 오구균;권태호;정승준
    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.28 no.4
    • /
    • pp.44-53
    • /
    • 2000
  • The purpose of this paper is to evaluate environmental friendliness for facilities of national park to improve naturalness of national park. We have evaluated environmental friendliness of the facilities in Chirisan national park in terms of resource conservation and environmental integration, which are consisted of 9 and 8 evaluation indicators, respectively. Environmental friendliness of the small facilities was not good due to not using locally obtained materials and natural material, and that of large and complex facilities was bad in the field of excessive damage during construction, inadequate maintenance, use of natural material, locally obtained material, environmental integration with surroundings. In evaluating environmental attributes, new facilities is better than the older ones. The small facilities appeared to be worse than those of the complex, and the large facilities are the worst in terms of environmental friendliness. In general, environmental friendliness turned out to be lower in the light of the facilities in the clustered area than those of the facilities of the other area. In the future, It is required that criteria for evaluating environmental friendliness of natural park facilities is established.

  • PDF

DEVELOPMENT AND VALIDATION OF A NUCLEAR FUEL CYCLE ANALYSIS TOOL: A FUTURE CODE

  • Kim, S.K.;Ko, W.I.;Lee, Yoon Hee
    • Nuclear Engineering and Technology
    • /
    • v.45 no.5
    • /
    • pp.665-674
    • /
    • 2013
  • This paper presents the development and validation methods of the FUTURE (FUel cycle analysis Tool for nUcleaR Energy) code, which was developed for a dynamic material flow evaluation and economic analysis of the nuclear fuel cycle. This code enables an evaluation of a nuclear material flow and its economy for diverse nuclear fuel cycles based on a predictable scenario. The most notable virtue of this FUTURE code, which was developed using C# and MICROSOFT SQL DBMS, is that a program user can design a nuclear fuel cycle process easily using a standard process on the canvas screen through a drag-and-drop method. From the user's point of view, this code is very easy to use thanks to its high flexibility. In addition, the new code also enables the maintenance of data integrity by constructing a database environment of the results of the nuclear fuel cycle analyses.

A Study on the Fire Safety Performance of Interior Surface Materials in a Building (건축물의 실내건축 재료에 관한 화재안전성 연구)

  • Seo, Su-Eun;Shin, Seung-Woo
    • Proceedings of the Safety Management and Science Conference
    • /
    • 2013.11a
    • /
    • pp.275-290
    • /
    • 2013
  • The main cause of building fire fatalities occur in the combustible material heat, smoke and toxic gases are. Building interior decoration, etc., especially as much of the harmful substances generated during combustion, and, used in domestic architecture wallpaper, ceiling, and other plastics, built-in foam insulation also analyzed recognition of fire hazards approach to test the conkalrorimiteo test, choedaeyeolbangchulryul through, chongbal heat, mass loss rate, generates carbon monoxide gas hazard ratio tests, analysis and evaluation rigid foam index testing the toxicity of hazardous material generated by performing a gas clean up and assess the material test results, the minimum order to provide data to quantify the risk of fire. Ensure fire safety of building materials, composite materials in order to test the various risk factors could be considered organic to the introduction of testing and evaluation is needed urgently.

  • PDF

A Study on the Reinforcement Corrosion Evaluation of Repair Material and Method for Reinforced Concrete Structure by Long Term Exposure Experiment (장기폭로실험에 의한 철근콘크리트구조물 보수재료$\cdot$공법의 철근부식특성 평가)

  • Kim Young Sun;Lee Eui-Bae;Kim Young Duck;Cho Bong Suk;Kim Jae Hwan;Kim Moo Han
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2005.05b
    • /
    • pp.197-200
    • /
    • 2005
  • In this study, for the establishment of the performance evaluation methods and the quality control standards of durability recovery method, the quantitative exposure data by long term exposure test under the coast is accumulated and analyzed Investigating and evaluating the result of exposure test at 30 month of exposure age under the coastal environment, carbonation and salt damage are not happened at all but the difference in electric potential are found. Therefore, it is considered that the reinforcement corrosion at replacement with repair material are caused by active-passive corrosion macrocells.

  • PDF

Waterproofing Material Evaluation Method based on Stress Dispersion Analysis due to Displacement in Railway Bridges (철도교량에 거동발생 시 응력분포 분석에 따른 적정 방수재료 선정을 위한 평가 방법)

  • Oh, Kyu-Hwan;An, Ki-Won;Kim, Soo-Yeon;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2021.05a
    • /
    • pp.59-60
    • /
    • 2021
  • To measure the effect of the stress-strain dispersion across the installed waterproofing layer on the concrete surface, a strain gauge was attached to the gap between the waterproofing layer and the concrete structure at specified points of upper, center and bottom of the load-displacement simulation specimen, and the peak stress-strain at the displacement interface were measured and compared with stress-strain at other areas to analyze each material types' stress-strain dispersion ratio properties. Based on the results of the testing, it was shown that materials with high load-displacement resistance performance accordingly had high stress-strain dispersion ratio results, and the materials from highest performance to lowest performance were; CAS, SAS, PUC and CSC.

  • PDF

Performance evaluation of cement-zero ECO pile-filling material utilizing recycled resource (순환자원을 활용한 Cement Zero형 ECO 파일채움재의 성능평가)

  • Song, Sang Hwon;Yoon, Seong Jin;Lee, Young Won;Eum, Hyun Mi;Mun, Kyoung Ju;Ko, Hyoung Woo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2013.11a
    • /
    • pp.8-10
    • /
    • 2013
  • Inorganic binding material was made by recycled resource and its applicability as pile-filling material was examined. The result was that the material had same liquidity with the liquidity of OPC and high reactivity with site soil. According to dynamic/static loading tests by site test-construction, the inorganic binding material met both design bearing capacity and settlement. Since the inorganic binding material showed same or better performance than OPC, the utilization possibility of the inorganic binding material made of recycled resource as pile-filling material was verified.

  • PDF