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가스분무법으로 제조한 MPP 분말코어의 자기적 특성에 미치는 열처리 효과
김구현(G. H. Kim),노태환(T. H. Noh),김광윤(K. Y. Kim),정인범(I. B. Jeong),최광보(G. B. Choi) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.4
The effects of heat-treatment with magnetic or non-magnetic field on magnetic properties of gas-atomized MPP dust cores subjected to various cooling processes after annealing were investigated. Upon magnetic-field annealing, ac permeability and core loss decreased with the increase of cooling rate, which were attributed to the generation of inhomogeneous internal stress and anomalous eddy current loss, respectively. It was not observed the formation of ordered phase and the related change in magnetic properties at the cooling stage for MPP dust cores. In MPP alloys, magnetic anisotropy was easily induced through the directional order, and permeability and core loss were changed under the conditions of low cooling rate and magnetic annealing.
SiC 휘스카 강화 알루미늄 복합재의 인장 거동에 대한 3 차원 유한요소법 해석
이동녕,오규환,정인범 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.12
Three dimensional finite element analysis was employed using the elasto-plastic model with work hardening characteristics to study the tensile behaviour of unidirectional short fiber composite. The internal stress and matrix yielding behaviour were studied and stress-strain curve of composite was predicted. Matrix yielding was greatly influenced by the presence of non-axisymmetrical part of matrix. There was the region of no yielding near fiber end even for higher applied stress than matrix tensile strength, which was associated with high triaxial stress state in that region. Load transfer through fiber end surface should not be ignored for the short fiber composite, because matrix fracture can be largely affected by load transfer through the fiber end. The predicted tensile strength of composite was obtained by the fracture criterion, when maximum effective stress of the matrix reaches tensile strength of matrix, composite material are fractured. The predicted tensile strengths of composite with various volume fraction and aspect ratio were in good agreement with experimental results.