• 한국정밀공학회지
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• 제14권12호
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• pp.135-142
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• 1997

New approach to determine thd design of automotive tire profile was introduced. In this study, design technology for tire profile was combined with a finite element method to improve high speed durability. Static and dynamic behavior analysis of new concept tire was compared with conventional tire profile. To obtain the improved tire performance, appropriate design values, ie. design methodology, section profile selection, material properties, are needed.

• 한국자동차공학회논문집
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• 제18권1호
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• pp.8-13
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• 2010

Many vehicles have significantly under-inflated tires, primarily because drivers infrequently check their vehicles' tire pressure. When a tire is used while significantly under-inflated, its sidewalls flex more and the tire temperature increases, increasing stress and the risk of failure. In this study we evaluated tire safety and economical efficiency at various inflation pressure. For tire safety we performed FMVSS indoor durability test, measurement of rolling tire temperature, braking performance at dry/wet road condition, and rolling resistance test for economical efficiency. Results show that low pressure decreases tire durability of both speed-increase condition and load-increase condition. Heat temperature of rolling tire increases as pressure decreases and significantly under-inflated tires cause increase of vehicle's stopping distance at wet road condition. Also Under-inflation increases the rolling resistance of a tire and, correspondingly, decreases vehicle's fuel economy.

• 대한기계학회논문집A
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• 제29권6호
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• pp.804-808
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• 2005

A pneumatic tire is made up of many flexible filaments of high modulus cord of natural textile, synthetic polymer, glass fiber, or fine hard drawn steel embedded in and bonded to a matrix of low modulus polymetric material. Adhesion property of these materials is very important in tire durability safety because belt-leaving-belt tread separation reduces the ability of a driver to control a vehicle, whether or not the separation is accompanied by a loss of air. In this study adhesion test of carcass-belt-tread is conducted on material properties of 5 PCR tire model, which are on sale in domestic market and analyzed adhesion properties. For those tire models FMVSS 109 indoor high speed durability test is conducted to analyze the correlation between adhesion force and high speed performance of tires and found the correlation between the two test results.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.378-383
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• 2001

In order to improve automobile maneuverability and tire durability, it is very important for one to determine a suitable sidewall contour producing the ideal tension and strain-energy distributions. In order to determine such a sidewall contour, one must apply multi-objective optimization technique. The optimization problem of tire carcass contour involves several objective functions. Hence, we execute the tire contour optimization for improving the maneuverability and the tire durability using satisficing trade-off method. And, the tire optimization also requires long cup time for the sensitivity analysis. In order to resolve this numerical difficulty, we apply neural network algorithm.

• 대한기계학회논문집A
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• 제25권10호
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• pp.1636-1643
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• 2001

Automobile maneuverability and tire durability are significantly influenced by the sidewall tire contour. In order to improve these tire performances, it is very important far one to determine a sidewall contour producing the ideal tension and strain-energy distributions. However, these requirements can nut be simultaneously achieved by conventional non-interactive multi-objective optimization methods based on mathematical programming, because these exhibit the conflicting behavior each other, with respect lo the sidewall contour. Therefore, we execute the tire contour optimization fur improving the maneuverability and the tire durability using satisficing trade-off method.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.896-900
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• 1996

New approach to determine the optimal design of automotive tire profile was introduced. In this study, optimal design technology was combined with a finite element method. Through tire profile optimization, tire profile was obtained and its profile improved high speed durability and maneuverability Static and dynamic behavior analysis of new concepted tire was compared with conventional tire profile. Optimal design methodology will provide much informations to improve various tire performances.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.525-530
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• 2004

In this paper, the optimum design of tire sidewall contour consisted of double plies for improving automobile maneuverability and tire durability is considered and a GUI program is developed for the purpose of the practical design. Each improvement of maneuverability and durability depends on the cord tension and strain energy distribution of tire sidewall. Satisfing trade-off method, which requires the judgment of aspiration levels, is used for the multi-objective optimization problem. Also, this paper presents the application to the practical sidewall contour design with the GUI program developed using visual Fortran.

• 한국농공학회논문집
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• 제58권1호
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• pp.19-26
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• 2016

This study was performed to evaluate the strength and durability properties of modified epoxy composites with waste tire chip, recycled coarse aggregate, filler and modified epoxy to improve elongation and elasticity of epoxy. Additionally, for comparing to modified epoxy and unsaturated polyester resin as a binder, unsaturated polyester resin composites were developed in the same condition. The mix proportions were determined to satisfy the requirement for the workability and slump according to aggregate size and binder content. Tests for the compressive and flexural strength, freezing and thawing and durability for 20 % sulfuric solution were performed. The compressive and flexural strength of modified epoxy composites were in the range of 34.9~61.6 MPa and 10.2~18.3 MPa at the curing 7 days, respectively. Also, the compressive and flexural strength of unsaturated polyester resin composites were in the range of 44.2~77.8 MPa and 11.3~20.8 MPa at the curing 7 days, respectively. After 300 cycles of freezing and thawing, weight decrease ratio and durability factor of modified epoxy composites were in the range of 0.8~1.9 % and 95~98, respectively. Accordingly, modified epoxy composites will greatly improve the durability of concrete.

• 접착 및 계면
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• 제4권1호
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• pp.28-34
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• 2003

강철 타이어 코드의 접착력 향상을 위하여 아세틸렌 플라즈마 중합 코팅, 아르곤 에칭+아세틸렌 플라즈마 중합 코팅, 그리고 아르곤 에칭+담채를 이용한 아세틸렌 플라즈마 중합 코팅을 실시하였으며, 접착력은 TCAT시편으로 측정하였다. 플라즈마 중합 코팅된 타이어 코드의 내구성을 고찰하기 위하여 제 1 단계로 아세틸렌 플라즈마 중합 코팅된 타이어코드를 상온에서 1, 3, 5, 10, 15일 동안 방치한 후 TCAT 시편을 제조하여 접착력변화를 측정하였으며, 제 2 단계로는 플라즈마 중합 코팅된 코드로 TCAT 시편을 제조한 후 증류수, 10% NaCl 수용액에서 또는 $100^{\circ}C$ 오븐에서 1, 2, 3, 4주간 노화시키면서 접착력 변화를 측정하였다. SEM/EDX을 이용하여 코드의 파괴표면을 분석하였으며, 황동코팅과 비교 분석하였다. 아르곤 에칭+담채를 이용한 아세틸렌 플라즈마 중합으로 코팅된 강철 타이어 코드의 접착력은 황동코팅된 시편의 접착력과 거의 같은 수준이었다. 타이어 코드의 상온 노화시험에서 황동코팅된 시편이 아세틸렌 플라즈마 중합 코팅된 시편에 비하여 우수 내구성을 보여주었으나, TCAT 시편의 노화에서는 아세틸렌 플라즈마 중합 코팅이 황동코팅에 비하여 우수하거나 비슷한 결과를 보였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집A
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• pp.716-721
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• 2001

The present study describes the experimental method to measure the strain of tire. In this study. the strain distributions of tire with air pressure and vertical load were measured at the bead filler edge region and on the carcass cord using strain gauges and the results were compared with indoor bead durability test results. The strain amplitude of carcass cord near the rim check line of tire is one of the main factors that affects bead durability characteristic.