한국산업융합학회 논문집 (Journal of the Korean Society of Industry Convergence)

  • 제23권1호
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  • Pages.73-81
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  • 2020
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  • 1226-833X(pISSN)
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  • 2765-5415(eISSN)
한국산업융합학회 (The Korean Society of Industry Convergence)
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자동차 에어 브레이크 스프링 고정용 SCM435 볼트의 파손 해석

Failure Analysis of SCM435 Bolt for Fixing Automotive Air Brake Spring

  • 윤서현 (부경대학교 마린융합디자인협동, 대학원) ;
  • 김민헌 (부경대학교 마린융합디자인협동, 대학원) ;
  • 남기우 (부경대학교 재료공학과)
  • Yun, Seo-Hyun (Interdisciplinary Program of Marine Convergence Design, Pukyong National University) ;
  • Kim, Min-Heon (Interdisciplinary Program of Marine Convergence Design, Pukyong National University) ;
  • Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong National University)
  • 투고 : 2019.12.29
  • 심사 : 2020.02.07
  • 발행 : 2020.02.28
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초록

This study analyzed the causes of failure of SCM435 bolts that fix the springs of automobile air brakes that have been fractured during use. The cause of failure was analyzed using SEM, EDS, metallogical microscope and Vickers hardness tester. In the fracture, the ratchet mark began at the outer boundary of crack origin, and the grains at crack origin were found to have clear intergranular corrosion. One SCM435 bolt was subjected to a stress of 398 MPa, it's a stress of about 80% of the fatigue limit. As a result of such a large applied stress, cracks occurred at the corrosion origin and were fractured. In order to prevent the SCM435 bolt from fracture, it is necessary to use the correct composition, the accuracy of heat treatment, preventing damage by external impact, preventing corrosion of the damage part by moisture, and introduction a compressive residual stress by peening.

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