• Title/Summary/Keyword: 프레팅마멸

Search Result 47, Processing Time 0.022 seconds

Experimental Analysis of Fretting Wear Behaviors in Elastic Deformable Contacts (탄성변형 접촉에서 프레팅 마멸거동의 실험적 분석)

  • Lee, Young-Ho;Kim, Hyung-Kyu
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.1
    • /
    • pp.49-54
    • /
    • 2010
  • Fretting wear behavior under elastic deformable contacts was experimentally examined by using a simulated dual cooled fuel rod and its supporting structure. As this fuel rod has larger outer diameter than the typical solid rod to accommodate sufficient internal flow, new supporting structure geometries should be designed and their reliabilities (i.e. vibration characteristics, fretting wear resistance, etc.) are also examined with both analytical and experimental methods. In this study, the supporting structure characteristics and fretting wear behaviors are analyzed and examined by using one of the supporting structure candidates which has an embossing shape. The supporting structure characteristics were examined by using a specially designed test rig and their results were compared with that of analytical method. Based on the test results, the relationship between the supporting structure characteristics and their fretting wear behaviors was discussed in detail.

Fretting Wear Test of Inconel 690 Tubes Employing Piezoelectric Actuator (압전 구동기를 이용한 인코넬 690 튜브의 프레팅 마멸시험)

  • Chung, Il-Sup;Lee, Myung-Ho;Park, Ki-Hong;Lee, Jung-Hoon;Kwon, Jae-Do
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.26 no.2
    • /
    • pp.101-108
    • /
    • 2009
  • A fretting wear test rig for dry ambient condition, which employs a piezoelectric actuator, has been developed. It is driven and loaded in a very simple manner with acceptable experimental accuracy. By using the rig, Inconel 690 tube has been tested under the normal load of 10 and 15N with sliding amplitude of less than $100{\mu}m$ during $10^6$cycles. The wear resistance of the material has been characterized in terms of the wear coefficient based on the work rate model. SEM micrographs show the complex structures of the scars, which consist of risen peaks, plate-type thin layers and locally exposed bare surfaces. The cracks spread over the layers give clue to the fretting wear mechanism of the material.

Measurement of Wear and Friction Coefficients for the Prediction of Fretting Wear (프레팅 마멸계수 및 마찰계수 측정에 관한 연구)

  • Cho, Yong Joo;Kim, Tae Wan
    • Tribology and Lubricants
    • /
    • v.28 no.3
    • /
    • pp.124-129
    • /
    • 2012
  • The prediction of fretting wear is a significant issue for the design of contacting mechanical components such as flexible couplings and splines, jointed structures and so on. In our earlier study, we developed a numerical model to predict the fretting wear using boundary element method. The developed algorithm needs experimental fretting wear coefficients and friction coefficients between two moving materials to get more reliable results. In this study, therefore, we demonstrated the measurement method of the fretting wear coefficients and friction coefficients using disk on plate tribometer with piazo actuator and gap sensor. For four different material combinations, the fretting wear coefficients and friction coefficients are acquired through the fretting wear experiment and the analysis of the measured values. Thess results are useful to predict the quantative fretting wear rate in the developed algorithm.

Development of Algorithm for Predicting Fretting Wear (프레팅 마멸 예측을 위한 알고리즘 개발)

  • Cho, Yong-Joo;Kim, Tae-Wan
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.35 no.9
    • /
    • pp.983-989
    • /
    • 2011
  • A numerical algorithm for predicting fretting wear was developed using the boundary element method (BEM). A contact analysis was performed numerically using the relation between the elastic displacement and uniformly distributed loading of a rectangular patch on a semi-infinite solid. Geometrical updating based on nodal wear depths was performed. The wear depths were computed using the Archard's equation for sliding wear. In order to investigate the efficiency of BEM for predicting fretting wear, a problem involving a two-dimensional cylinder on a flat contact was analyzed, comparing it with the simulation model proposed by McColl et al. that was based on the finite element method. The developed method was then applied to the analysis of a spherical contact and it was shown that the developed simulation technique could efficiently predict fretting wear. Moreover, the effect of a step cycle on the solution obtained by the developed method was investigated.

Improvement of Slip Displacement Evaluation for the Analysis of Tube Fretting Wear (튜브 프레팅마멸 분석을 위한 미끄럼변위 해석방법 개선)

  • Song, Ju-Sun;Kim, Hyung-Kyu;Lee, Young-Ho;Kim, Jae-Hoon
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.67-72
    • /
    • 2004
  • Fundamentally, slip displacement should be known to solve the problem related to the fretting wear. For this, methods for measuring the slip displacement range in the contact surface of the tube and the supports were introduced and analyzed in this study. Also the increment of the slip displacement during a cycle was calculated using the revised formulas. As a result, the slip displacement newly evaluated was much higher ($7{\sim}50$ times) than that previously evaluated especially in the case of the gap existence. This enables to explain the severe wear found when there was a gap between the tube and the supports.

  • PDF