Size Effect on the Modulus of Rupture in Automotive Ceramic Monolithic Substrate using Optimization and Response Surface Method

Baek, Su‐Jin; Shin, Soon-Gi; Joo, Won-Sik; Cho, Seok-Swoo

doi:10.3795/ksme-a.2006.30.11.1392

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Engine speed (rpm) 1000 1800 2700 3600 4500 5400 axial modulus of rupture (MOR), a ring-off crack forms within the catalyst substrate surface [7,12]. This ring-off crack tends to propagate inward because the catalyst substrate undergoes a repetitive thermal cycle.…”

Section: Thermal Stress Analysismentioning

confidence: 99%

“…Also, the ceramic catalysts need to have a tight thermal durability in order to perform their role of purifying the exhaust gases at high temperatures [3][4][5]. Since 1990, the Korean exhaust emissions regulations have demanded vehicles have a 5 year (80,000 km) durability, and in 2000 this requirement was raised to a 10 year (160,000 km) durability [6,7]. In particular, the catalyst and electronic control units and their related parts must have a 7 year (120,000 km) durability.…”

Section: Introductionmentioning

confidence: 99%

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Thermal design criteria for long-term durability of ceramic catalyst substrates

Baek

Cho

2011

J Mech Sci Technol

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The automotive industry has traditionally used ceramic honeycomb substrates as catalyst carriers. The long-term durability of a passenger car's converter is assessed by examining the thermal stresses resulting from the temperature variations experienced under various driving conditions. These thermal stresses constitute the majority of the total stress that the ceramic catalyst substrate experiences while in service. The radial and axial temperature distributions were measured, and the thermal stress was calculated by using the thermal expansion coefficient according to the measured temperature. The threshold stress was determined from the fatigue constant, the required lifetime and the duration of the short term strength tests. The radial temperature variation was higher than the axial temperature variation, and the axial stress was higher than the radial stress because the thermal stress is dependent on the elastic modulus. The radial and axial stresses exist below the threshold thermal stress over the entire engine speed range.

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Section: Thermal Stress Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal design criteria for long-term durability of ceramic catalyst substrates

Baek

Cho

2011

J Mech Sci Technol

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“…레이저보조가공에 고 속가공을 적용하기 위해서는 주축이 정•동적으로 안정되어야 하므로 주축의 정•동적 특성을 개선하 여 안정적인 설계가 필요하다. (12) Baek 등 (13) 과 Lim 등 (14) 은 반응표면법을 이용하 여 코제라이트 세라믹 모노리스 담체(cordierite ceramic substrate)의 파단계수에 대한 회귀모델을 추정하는 연구와 5 축 임펠러(impeller) 정삭 가공 의 최적화에 관한 연구를 각각 수행하였다. 기존 연구 (7~10) 에서는 설계변수로 베어링 간격과 축직경 및 베어링 강성 등을 고려하였으나, 본 연 구에서는 주축 특성에 영향을 미치는 여러 가지 인자 중에서 축 길이, 내부 직경, 베어링 간격, 내 장형 모터(built-in motor)에서 축을 지지하고 있는 Composite Desirability = 1.00…”

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Static and Dynamic Analysis and Optimization Design of 40,000-rpm High-Speed Spindle for Machine Tools

Kim¹,

Lee²,

Choi³

2013

Transactions of the Korean Society of Mechanical Engineers A

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The spindle is the main component in machine tools. The static and dynamic characteristics of the spindle directly affect the machining accuracy of workpieces. The characteristics of the spindle depend on the shaft size, bearing span, built-in motor location, and so on. Therefore, the appropriate selection of these parameters is important to improve the spindle characteristics. This paper presents the analysis of the static and dynamic characteristics and optimization design of a 40,000-rpm high-speed spindle. Statistical analysis for optimization and finite element analysis were performed. This study uses the response surface method to optimize the objective function and design factors. The targets are the natural frequency and displacement. The design factors are the shaft length, shaft diameter, bearing span, and motor location. The optimized design provides better results than the initial model, and these results are expected to improve the static and dynamic characteristics of the spindle.

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“…Coefficient of thermal expansion (℃) 6×10 -7 1.76×10 -6 2.6×10 -6 3.25×10 -6 3.75×10 -6 4.16×10 -6 Thermal conductivity  (W/m ) ℃ 1.7 2.7 3.4 4.0 4. . (3,7,18) MOR 1.0x10 -6 1.5x10 -6 2.0x10 -6 2.5x10 -6 3.0x10 -6 3.5x10 -6 Intercept=1/48bD 2.0x10 -8 3.0x10 -8 4.0x10 1.5x10 -7 2.0x10 -7…”

mentioning

confidence: 99%