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비선형 열팽창 특성을 고려한 이종 접합 복합재의 열변형 해석
김정범(Jeong-Beom Kim),김홍일(Hong-Il Kim),전호찬(Ho-Chan Jeon) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.10
큰 온도 변화를 받는 이종 접합 복합재는 재료의 서로 다른 열팽창 특성으로 인해 열에 의한 형상 왜곡이 발생되기 쉽다. 성형 과정에서 이종 접합 복합재 구조물의 제작 공정 중의 형상 왜곡 현상을 고려하기 위해서 구성하는 각각의 복합재료들에 대한 열팽창 특성 분석이 우선적으로 요구된다. 본 논문에서는 Carbon/Epoxy와 Silica/Phenolic의 이종접합 복합재료 시편의 열변형 특성을 측정하기 위해 디지털 영상 상관 기법(DIC)을 활용하였다. 이종 접합 복합재 시편의 열변형에 대해 수치 해석을 수행하였고 이를 실험 결과와 비교하였다. 수치해석을 통한 예측 결과는 실험을 통하여 입증되었다. The co-bonded dissimilar composite under a wide range of temperature change shows thermal distortion due to the differences in thermal expansion characteristics of the composite materials. Analysis of the thermal expansion characteristics of each composite is required for the design of co-bonded dissimilar composite structure with considering the shape distortion during the manufacturing process. In this work, digital image correlation (DIC) technique is introduced for measuring the thermal distortion characteristics of co-bonded dissimilar composite specimen, carbon/epoxy and silica/phenolic. The thermal distortion of co-bonded dissimilar composite specimen is numerically estimated and compared with the experiments. The estimated results is successfully validated using the measured results.
이세환(Se-Hwan Lee),이대은(Dae-Oen Lee),박근수(Keun-Soo Park),전호찬(Ho-Chan Jeon),김성태(Seong-Tae Kim),박정웅(Jeong-Ung Park) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.6
Deformation that occurs during girth welding and seam welding of large-diameter STS304 thin plate structure changes the shape of the structure and affects the manufacturing of the next process. In order to control this deformation, the welding deformation generated during girth and seam laser welding was controlled by generating the relationship between the neutral axis and the welding position and initial tensile stress by the tensile force method. The deformation that occurs during girth welding is caused by angular distortion, and the amount of the deformation is affected by the neutral axis and the position of the weld. By changing the position of the welding part, welding deformation by up to 50% has been reduced. Deformation generated during seam welding caused by angular distortion and longitudinal bending deformation created an initial tensile residual stress in the weld, and the deformation was controlled by minimizing the constraint by welding heat stress generated during welding. At this time, when the magnitude of the initial tensile stress due to the external load increased to 50% of the yield stress of the base metal, the final deformation appeared close to zero.