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손동일,소상우,최동혁,김대일 한국복합재료학회 2019 Composites research Vol.32 No.5
As demand of light weight in the automotive industry has increased, the cowl cross member has been investigated using various methods to change the material. Conventionally, a cowl cross member has been made of steel and aluminum, but recently researchers tested multi-material such as aluminum and plastic. We studied a new model of the cowl cross member made of composite and non ferrous materials. For products with a high degree of freedom in design, generally, the method of topology optimization is advantageous and for the partial bracket part of the cowl cross member had a degree of freedom in the design, a topology optimization is appropriate. Considering the characteristics of the cowl cross members, we need research to minimize the weight while having the performance of noise, vibration and harshness(NVH). Taking the mounting status of the product into consideration, we used an assembly model to optimize the cowl cross member. But this method took too much time so we considered simple cowl cross member assemble conditions using the direct matrix input method(DMI) with the Craig-Bampton Nodal Method. This method is capable of considering the status of the assembly without assembling the model, which reduced the solving time and increased the accuracy comparison with a cowl cross member without DMI.
강구조물에 대한 현장에서의 비파괴적 인장물성 평가 기술 개발
손동일 ( Son Dongil ),최열 ( Choi Yeol ),장재일 ( Jang Jae-il ),권동일 ( Kwon Dongil ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
A newly developed Advanced Indentation System (AIS), which is a portable and nondestructive system for evaluating tensile properties, was used to measure stress-strain behavior of steel structure. For all test materials and conditions, the AIS-derived results were in good agreement with those from conventional standard test method. Furthermore, the nondestructive AIS test results rigorously indicated the various levels of degradation of materials. Examples of the test results are given and potential applications of the AIS to assess the integrity of aging structures are briefly discussed.