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볼트 체결부 해석 방법론 최적화를 통한 체결 주요인자 영향성 연구
이준하(Joon Ha Lee),조종래(Jong Rae Cho),조희욱(Hee Wook Cho),강주연(Joo Youn Kang),김문성(Moon Sung Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In order for promotion the fastening robustness on early stage of development for all joints of automobile, optimization of FEA methodology of bolted joint should be needed. This paper describes the process of developing optimization of all kinds of FEA methodology for bolted joint and the result and comparison of each methodology on a representative joint design. In addition to FEA optimization, various key factors on joint tightening are quantitatively studied by utilizing this optimized FEA methodology.
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Experimental investigation of novel pre-tightened teeth connection technique for composite tube
Fei Li,Qilin Zhao,Haosen Chen,Longxing Xu 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.2
A new composite tube connection method called the pre-tightened teeth connection technique is proposed to improve the composite tube connection efficiency. This paper first introduces the manufacturing process of the proposed technique. It then outlines how the mechanical properties of this technology were tested using four test groups. The factors that influence the load-bearing capacity and damage model of the connection were analyzed, and finally, the transfer load mechanism was investigated. The following conclusions can be obtained from the research results. (1) The new technique improves the compressive connection efficiency by a maximum of 79%, with the efficiency exceeding that of adhesive connections of the same thickness. (2) Changing the depth of teeth results in two types of damage: local compressive damage and shear damage. The bearing capacity can be improved by increasing the depth, length, and number of teeth as well as the pretightening force. (3) The capacity of the technique to transfer high loads is a result of both the relatively high interlaminar shear strength of the pultruded composite and the interlaminar shear strength increase provided by the pre-tightening force. The proposed technique shows favorable mechanical properties, and therefore, it can be extensively applied in the engineering field.
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통화 긴축기 가계부채 경로를 통한 실물경제 반응 분석: 한-미 간 가계부채의 구조적 상이성을 중심으로
최남진 국제지역학회 2024 국제지역연구 Vol.28 No.1
After the global financial crisis, major countries recognized the risk of household debt and managed it. On the other hand, in Korea, household debt has steadily increased. Recently, it has been raised that the interest rate hike due to high inflation, combined with the household debt problem, may lead to a contraction of the real economy. Accordingly, this study analyzed how the shock of interest rate hikes during a period of monetary tightening constrains the real economy through the household debt channel. Empirical analysis was conducted on the premise of structural differences between Korean and American household debt. For analysis, a six-variable SVAR model based on economic theory was set up. Through this, the dynamic response of each variable to the shock of interest rate increase was confirmed. As a result of the analysis, both Korea and the United States showed a decrease in consumption and GDP in response to the shock of the interest rate increase. This result is consistent with economic theory, but there was a difference in the scale of decrease. In the United States, consumption and total production decreased by 0.21% and 0.28%, respectively, in response to the impact of the interest rate increase. On the other hand, Korea recorded 1.28% and 0.49%, a significant decrease compared to the United States. This means that Korea's household debt has continued to expand relative to the size of the economy since the global financial crisis. Structurally, as the proportion of variable interest rates is high, the burden of principal and interest increases significantly when interest rates rise. This is believed to have greatly restricted consumption by reducing real income. Ultimately, it is thought that it will lead to a decrease in GDP and place a significant burden on Korea's real economy.
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박종인(Jong In Park)․,박정원(Jung Won Park)․,정민호(Minho Jung)․,허양현(Yang Hyun Huh)․,배석주(Suk Joo Bae) 한국산업경영시스템학회 2008 한국산업경영시스템학회지 Vol.31 No.4
신뢰성 평가 시험은 종종 성능 평가에 장기간의 시간이 요구되며, 전체 생산비용까지 증가시키는 문제점을 안고 있다. 스트레스를 이용한 가속수명시험은 제품의 신뢰성 고장과 밀접한 관련이 있는 고장 메커니즘의 촉진을 통해 고장에 이르는 기간을 단축함으로써 신뢰성 평가의 효율성을 도모할 수 있다. 본 연구에서는 이러한 스트레스 가속 시험에 빈도가속(Usage-Rate Acceleration) 또는 판정가속(Tightening Critical-Values) 등을 결합하여 한층 높은 가속효과를 도모하는 방법을 제안하고, 국내에서 생산되고 있는 2차 전지 제품에 대한 실제 시험 사례분석을 통해 결합된 가속방법의 효과를 실증적으로 보여주고 있다.
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