• Journal of the Korean Society of Propulsion Engineers
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• v.20 no.4
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• pp.34-39
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• 2016

Arrhenius kinetic constants, the activation energy and the pre-exponential factor, of energetic material $BKNO_3$ are estimated using Differential Scanning Calorimetry (DSC). Different from the conventional way, the activation energy was estimated more precisely through DSC aging trial, and the consumed fraction by heat was calculated by comparing the integration of heat flow. We suggested the condition of accelerated aging test for the energetic material $BKNO_3$ and reconsidered the meaning of the thermal accelerated aging.

• Proceedings of the Korean Nuclear Society Conference
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• 2001.10a
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• pp.333.1-333
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• 2001

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.5
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• pp.505-511
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• 2014

The EPDM(ethylene-propylene diene monomer) rubbers used for manufacturing engine radiator hoses can be degraded by locally generated electrical stress in addition to thermal and mechanical stresses. This study presents an accelerated life prediction of the EPDM rubber under electrochemical stresses using the Arrhenius formula under various aging temperatures($60^{\circ}C$, $80^{\circ}C$, and $100^{\circ}C$). The modified life prediction formula considers the relationship between the gradient($E_a/R$) and the Arrhenius constant(C). The effects of tensile strain(5%, 10%) on the life of these rubbers were investigated. The aging temperature influences EPDM rubber life, and tensile strain was predicted. It was confirmed that the modified life prediction was within the data deviation level of the test.

• Journal of Digital Convergence
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• v.19 no.6
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• pp.113-132
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• 2021

This study is a new evaluation using the Arrhenius equation, which is known as the chemical reaction rate estimation equation, to evaluate the intrinsic and extrinsic value elements of patents as a model. The performance of the evaluation model was superior to the SVM, Logistic reg. and ANN models that were used as patent evaluation models in prior studies. In addition, there was a strong correlation between the predicted lifespan of the patent and the actual lifespan of the patent. These evaluation models may be used for evaluation purposes only, or if an evaluation is required, including a commercialization entity or technical characteristics.

• Transactions of the Korean Society of Mechanical Engineers
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• v.14 no.6
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• pp.1552-1560
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• 1990

A general form of the mathematical function in the fatigue crack growth rate law for CT specimens was determined by means of the dimensional analysis at elevated temperatures. The experimental results can be rigorously described by the combination of rate theory and fracture mechanics. The rate theory approach extends the scope of fracture mechanics through the consideration of the temperature. The fatigue crack growth rates are represented by the Arrhenius type equation. This equation explains fairly well the experimental data for Cr-Mo-V rotor steel and A517-F steel in the comparatively wide temperature regions as affected with the temperature and the stress intensity factor range interaction.

• Elastomers and Composites
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• v.37 no.2
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• pp.107-114
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• 2002

This paper discusses the accelerated heat aging tests were carried out to predict the useful life of EPDM isolating rubber components of ventilation fan motor for clean room. 20% compression set results changes as the threshold are used for assessment of the useful life and the time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot. The useful life at variable temperatures and activation energy are obtained from the Arrhenius relationship. An accelerated test program to assess useful life can be represented an appreciable investment in time was designed. We also considered the effect of antioxidant agents.

• Journal of Korean Society for Quality Management
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• v.25 no.3
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• pp.1-10
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• 1997

In the context of accelerated life tests, procedures are given for estimating the parameters in the modified Arrhenius model and for estimating mean life at a given future stress level. The conditional confidence intervals are obtained by conditioning on ancillary statistics and pivotal quantity. Using the data of Tobias and Trindada(1986), we illustrate conditional confidence interval for parameters under use condition in the modified Arrhenius model.

• Proceedings of the Korean Reliability Society Conference
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• 2000.11a
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• pp.235-241
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• 2000

가스기기 안전장치 및 조리기구에 중요한 안전장치인 Gas Sensor를 가속시험을 이용하여 신뢰성을 분석하였다. 시험을 실시한 결과 GAS SENSOR의 Heater는 인가전압에 따른 특성 변화가 아레니우스 모델과 어링모델이 잘 일치함을 보여주었다. 즉, Heater선의 전압은 발열온도에 비례하고 있음을 알 수 있었다. 이번 실험을 통하여 STRESS에 비례적으로 특성이 변하는 제품은 설계단계에서 수명에 영향을 주는 잠재적 취약부를 단시간에 효과적으로 끌어내어 개선할 수 있는 기술임을 입증하였으나 다양한 STRESS의 복합적인 인자에 의하여 변화되는 특성을 분석하여 실질적으로 현장실무에 활용을 위해서는 많은 기술적 보안이 필요할 것으로 판단된다.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1391-1393
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• 2008

In this paper, the long-term reliability for 1.25G transceiver in use of high speed optical access network is investigated. High temperature storage tests and accelerated life tests are used to long-term reliability. Accelerated aging test have been during 3,000 hour of the three accelerated aging conditions by caused high temperature stress. Mean life is assumed to follow the Arrhenius relationship and analysis from the failure data obtained in the accelerated aging conditions.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1445-1447
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• 2003

산업공장에서 저압케이블이 지중에 집중 매설되어 있는 경우 운전전류에 의한 케이블 도체온도가 도체허용온도를 초과할 수 있다. 또한 절연재질의 활성화 에너지와 환경온도로 표현되는 아레니우스 모델의 환경온도 대신 운전전류에 의해 계산된 도체온도를 사용하여 케이블의 수명을 예측하여 보았다.