http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Methodology for Predicting the Durability of Aged Tire Sidewall Under Actual Driving Conditions
Byungwoo Moon,Jongmin Lee,Seongrae Kim,Soo Park,Chang-Sung Seok 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.8
This article presents new rational methodology to predict the life for actual driving condition of an aged tire sidewall, and how to judge durability for fatigue life. Generally, life prediction methods in previous studies have presented simple lifetime under normal rolling state using a strain, stress, and virgin property, but this paper used an actual driving pattern, strain energy density and aged rubber property to predict accelerated test results. For this purpose, steady-state rolling analysis and fatigue test are applied to predict the durability life of tire under actual driving conditions. A finite element model of a tire which can replicate the aged tire sidewall was generated, and the driving distance of the tire was calculated using the dynamic rolling radius. The rate of acceleration, deceleration, and cruising is calculated by applying the driving patterns of peak hours of major cities where cruising time is low due to high traffic volume. This paper contains all procedure and methodology for predicting the durability of aged tire sidewall such as method to predict life, finite element analysis, and application of aging rubber.
타이어 사이드월 고무의 피로특성 및 수명예측에 관한 연구
문병우(Byungwoo Moon),김용석(Yongseok Kim),전남규(Namgyu Jun),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),홍의석(Ui Seok Hong),오민경(Min Kyeong Oh),김성래(Seong Rae Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.7
최근 수요가 급격히 증가하고 있는 고성능 UHP (Ultra High Performance)타이어의 경우 낮은 편평비로 인해 일반 타이어 보다 사이드월 고무에 가혹한 변형이 발생하게 된다. 사이드월 고무의 변형이 지속적으로 발생할 경우 피로손상이 축적되어 피로파괴 현상이 나타날 수 있다. 따라서 차량 주행 중 발생하는 안전사고 예방을 위한 사이드월 고무의 내구성능 평가가 중요한 문제로 대두되고 있다. 그러나 타이어 사이드월 고무의 내구성능에 대한 설계 기준 및 연구는 국내외적으로 잘 알려져 있지 않다. 본 연구에서는 타이어 사이드월 고무 2종에 대하여 인장시험과 피로시험을 수행하여 변형률에너지밀도를 이용한 수명예측식을 제시하였다. 또한, 저연비 타이어의 주행가능 예상거리를 도출하여 내구성능 만족여부를 검토하였다. In the case of the UHP (Ultra high performance) tire that the demand has increased rapidly, compared with the commonly used tire, severe deformation has been observed because of the low aspect ratio. When repeated deformations are applied to the sidewall rubber, accumulated fatigue damage may cause fatigue failure. Thus, the evaluation of the durability of the tire sidewall rubber has become a very important issue to prevent accidents that occur while the vehicle is running. However, the research and design criteria for the durability performance of the tire sidewall rubber hardly exist. In this study, we suggest a lifetime prediction formula using strain energy density obtained by performing tensile tests and fatigue tests on two different kinds of the tire sidewall compounds. Additionally, the applicability of our findings for low fuel consumption tires was reviewed by converting the fatigue life of the sidewall rubber into the expected mileage of the tire.
Evaluation on Fatigue Characteristics of Tire Sidewall Rubber according to Aging Temperature
( Namgyu Jun ),( Byungwoo Moon ),( Yongseok Kim ),( Jae-mean Koo ),( Chang-sung Seok ),( Ui Seok Hong ),( Min Kyeong Oh ),( Seong Rae Kim ) 한국고무학회 2017 엘라스토머 및 콤포지트 Vol.52 No.3
Ultra-high performance (UHP) tires, for which demand has recently surged, are subject to severe strain conditions due to the low aspect ratio of their sidewalls. It is important to ensure sidewall material durability, since a sudden tire sidewall breakage during vehicle operation is likely to cause a major accident. In the automotive application of rubber parts, cracking is defined as a failure because when cracks occur, the mechanical properties of rubber change. According to Mars<sup>(8)</sup>, Andre<sup>(11)</sup> et al., strain and strain energy density (SED) are mainly used as a failure parameters and the SED is generally used as a fatigue damage parameter. In this study, the fatigue life curves of sidewall rubber of tires were determined by using the SED as fatigue damage parameter while the effect of aging on fatigue life was evaluated after obtaining the SED-Nf curves according to aging condition.
Kim, Seongrae,Park, Hanseok,Moon, Byungwoo,Sung, Kideug,Koo, Jae-Mean,Seok, Chang-Sung Elsevier 2019 International journal of fatigue Vol.118 No.-
<P><B>Abstract</B></P> <P>In the tire industry, indoor accelerated life tests as regulations have been performed to ensure tire durability performances instead of outdoor field test. The finite element method has been widely used to minimize real test time and cost, but prediction method for accelerated life test had hardly been made in the past. This study presents a rational methodology to predict the tire’s failure life at the steel belt edge region due to high speed regulation test. Based on the finite element analysis and fatigue characteristic of rubber material, a method to determine exact failure time is proposed. The steady-state rolling analysis by FEM to get strain energy density range(Δ<I>SED)</I> at the steel belt edge region and fatigue test of rubber compound to obtain Δ<I>SED</I>- number of cycle (<I>N<SUB>f</SUB> </I>) curve were used. The reliability of proposed prediction method was verified by real indoor test.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New rational methodology to predict the accelerated life test. </LI> <LI> Acceptance or refusal for the regulation lifetime. </LI> <LI> Accelerated life test to shorten developing time. </LI> <LI> Procedure to predict accelerated life test. </LI> </UL> </P>
Sungho Yang,Junghan Yun,Byungwoo Moon,Soo Park,Chang-Sung Seok 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
The blade is the main component of a gas turbine and operates in a harsh hightemperature environment. Nickel-based super alloys with excellent performance at high temperatures are mainly used for blades, and inspection and replacement are performed based on the manufacturer's standards. In previous research, microstructure analysis and mechanical strength evaluation were performed for blades that were used in domestic operating environments and exceeded their service life based on the manufacturer’s standards, and the optimal rejuvenation conditions were derived. In this study, to verify the derived rejuvenation conditions for gas turbine blades, we evaluated the creep durability according to the aging time using commercial gas turbine blades of new and rejuvenated products. The size and volume fraction of ߛ' and MC decomposition that affect creep durability were measured through microstructure analysis, and the test results were evaluated.