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Evaluation of Thermal Shock Damage of Metal Matrix Composite Using Ultasonics

초음파를 이용한 금속기지 복합재료의 열충격 손상 평가

  • 강문필 (부산대하교 대학원) ;
  • 이민래 (부산대하교 기계기술연구소) ;
  • 이준현 (부산대하교 기계공학부)
  • Published : 2005.11.01

Abstract

Metal matrix composites(MMCs) have been rapidly becoming one of the strongest candidates for structural materials fur many high temperature application. However, among the various high temperature environments in which metal matrix composites was applied, thermal shock is known to cause significant degradation in most MMC system. Due to the appreciable difference in coefficient of thermal expansion(CTE) between reinforcement and metal matrix, internal stresses are generated following temperature changes. Infernal stresses affect degradation of mechanical properties of MMC by causing microscopic damage in interface and matrix during thermal cycling. Therefore, the nondestructive evaluation on thermal shock damage behavior of SiC/A16061 composite has been carried out using ultrasonics. For this study, SiC fiber reinforced metal matrix composite specimens fabricated by a squeeze casting technique were thermally cycled in the temperature range 298$\~$673 K up to 1000cyc1es. Three point bending test was conducted to investigate the efffct of thermal shock damage on mechanical properties. The relationship between thermal shock damage behavior and the propagation characteristics of surface wave and SH-ultrasonic wave was discussed by considering the result of SEM observation of fracture surface.

Keywords

Metal Matrix Composit;Thermal Shock;Ultrasonics;Surface Wave;SH-Wave

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