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유리섬유강화 폴리카보네이트의 응력이완과 점탄성거동Stress Relaxation and Viscoelastic Behavior of Polycarbonate Reinforced with Glass Fiber

Other Titles
Stress Relaxation and Viscoelastic Behavior of Polycarbonate Reinforced with Glass Fiber
Authors
Jang, Seung-SooSakong, JaeChoi, Wan-kyuKim, Tae-Won
Issue Date
Sep-2019
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Keywords
Stress Relaxation; Polycarbonate; Glass Fiber Composite; Shear Lag Model; Viscoelastic Behavior
Citation
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A, v.43, no.9, pp.611 - 623
Indexed
SCOPUS
KCI
Journal Title
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A
Volume
43
Number
9
Start Page
611
End Page
623
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/12583
DOI
10.3795/KSME-A.2019.43.9.611
ISSN
1226-4873
Abstract
유리섬유강화 폴리카보네이트는 기존 폴리카보네이트에 비하여 강도, 강성 및 피로수명 특성이 향상됨에 따라 다양한 기계소재로 활용되고 있다. 이와 관련하여 재료 강도뿐만 아니라 고분자기반 복합재료에서 나타나는 점탄성변형에 따른 시간 의존적 거동 분석이 필수적으로 요구된다. 본 논문은 유리섬유 강화 폴리카보네이트가 장시간 하중에 노출되었을 때 나타나는 물성 변화 연구와 관련하여 섬유 함량과 변형률속도 변화에 따른 응력이완을 고찰하였다. 유리섬유의 함량이 각각 10%, 20% 및 30%로 사출 제작된 시편에 다양한 변형률속도를 적용한 응력이완 시험을 수행하였으며, 이를 기반으로 탄성과 점성의 영향이 함께 고려된 generalized Maxwell 모델을 제시하였다. 또한 전단지연 모델을 바탕으로 섬유 함량에 따른 응력이완계수를 예측하였으며, 시험값과 최대 오차율 2.02% 미만이 됨을 확인하였다. 아울러 변형률속도에 따른 응력이완 시험 결과로부터 변형률속도민감계수를 계산하였으며, 이를 통해 섬유 함량과 변형률속도가 반영된 응력이완계수 예측모델을 구성하고 최종적으로 점성계수를 도출하였다. 초기 응력이완 구간의 점성특성과 관련된 1차 점성계수는 상대적으로 많은 섬유 함량에서 높은 값을 보였으며, 응력이완 전반의 점성특성을 나타내는 2차 점성계수는 섬유 함량 증가에 따라 작은 값이 나타남을 알 수 있었다. The glass-fiber-reinforced-polycarbonate is utilized in various materials for better strength, stiffness, and fatigue life characteristics than pure polycarbonate. In this regard, it is essential to analyze not only the material strength but also the time-dependent behavior associated with viscoelastic deformation in the polymer matrix composite materials. In this paper, the stress relaxation of glass-fiber-reinforced-polycarbonate was studied according to the fiber weight fraction and strain rate to analyze the changes in material properties due to long-time load exposure. Stress relaxation tests with various strain rates were conducted on specimens having 10, 20, and 30 weight fractions of glass fiber. Based on the results, the Generalized Maxwell model was presented considering the effect of elasticity and viscosity. Moreover, based on the shear lag model, the relaxation modulus was predicted according to the fiber weight fraction, and the maximum error between the prediction and test results was found to be less than 2.02. In addition, the coefficients of strain rate sensitivity were calculated from the stress relaxation test according to the strain rate, and then the relaxation modulus prediction model was proposed based on the fiber weight fraction as well as the strain rate. Finally, the viscosity was derived from the proposed relaxation modulus prediction model. The primary viscosity, associated with the viscosity characteristics of initial stress relaxation region, slightly increased with the fiber weight fraction. The secondary viscosity, related with the viscosity characteristics of the overall region, decreased as the fiber weight fraction increased.
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