Original Article
  • Numerical Analysis of Stress, Deflection, and Fatigue Life of a PA66/Glass-Fiber Composite Applied to a Mini-Chain under Reverse-Driving Conditions with Varying Glass-Fiber Content

  • Gi-Chan Kim*, Kyu-Cheol Choi*, Yun-Ho Ko**, Jaeho Jung***†

  • * Graduate Student, Department of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea
    ** Undergraduate Research Student, School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea
    *** Professor, School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea

  • 역구동 미니 체인 구조에 적용된 PA66/유리섬유 복합재의 유리섬유 함량 변화에 따른 응력  ·  처짐  ·  피로 수명 수치해석

  • 김기찬* · 최규철* · 고윤호** · 정재호***†

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This numerical study evaluated the effect of glass-fiber (GF) content in PA66/GF composites (PA66, GF15, GF25, GF35, and GF50) on hotspot stress, deflection, and fatigue life of a mini-chain under reverse-driving conditions. A static finite element model with remote displacement and frictional contact (μ = 0.3), combined with a stress–life assessment based on literature S–N curves (Basquin fit with Goodman correction, R = 0), revealed a trade-off: increasing GF reduced deflection but increased hotspot stress and maximum contact pressure (interpreted conservatively as a wear-propensity indicator). GF50 exhibited the lowest life (potentially <106 cycles), whereas GF25 provided the most balanced performance while meeting the 106 cycle durability criterion, with GF15 regarded as a conservative option showing lower stress/contact responses.


본 연구는 역구동 조건의 미니 체인을 대상으로 PA66/유리섬유(GF) 복합재의 GF 함량(PA66, GF15, GF25, GF35, GF50)이 응력 집중, 처짐 및 피로 수명에 미치는 영향을 수치해석으로 평가하였다. 원격 변위(remote displacement)와 마찰 접촉(μ = 0.3)을 포함한 정적 유한요소해석과 문헌 기반 S–N 곡선(Basquin 피팅, Goodman 보정, R = 0)의 Stress–Life 평가 결과, GF 함량 증가는 처짐을 감소시키는 반면 핫스팟 응력과 최대 접촉압(마모 잠재지표)을 증가시키는 trade-off(상충관계)를 보였다. GF50은 가장 낮은 수명(106 cycles 미만 가능성)을 나타낸 반면, 내구 기준(106 cycles)을 만족하면서 처짐 저감 효과와 응력·접촉 지표 증가가 과도하지 않은 GF25를 가장 균형적인 후보로 정리하였다. 또한 GF15는 GF25 대비 처짐 저감 이득은 작지만 최대 등가응력과 최대 접촉압이 상대적으로 낮아 보수적 선택지로 고려될 수 있다.


Keywords: 역구동 조건(Reverse-driving conditions), 미니 체인(Mini-chain), PA66/유리섬유 복합재(PA66/Glass-fiber composite), 유한요소해석(Finite element analysis), 응력-수명 피로(Stress–life fatigue)

This Article

Correspondence to

  • Jaeho Jung

  • Professor, School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Korea

  • E-mail: jhj@cbnu.ac.kr