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박홍래,이정민,성완,김원백,최종술 ( Hong Lae Park,Jeong Min Lee,Wan Sung,Won Beak Kim,Chong Sool Choi ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.4
The high strain-rate dynamic plastic behavior of Fe-X%Mn alloys was investigated. The strain rate did not have an effect when tested under quasi-static strain rates(2×10^(-3)/sec and 2×10^(-1)/sec). However, the true stress increased at all strain levels when the strain rate increased to 6×10³/sec. Based on the experimental results, an constitution equation to calculate the dynamic strength for strain rates over 10⁴/sec was determined. The Fe-5%Mn alloy containing athermal α` martensite initially did not show work hardening. The work hardening increased with Mn content showing a maximum at 20% Mn. The high work hardening of Fe-20%Mn and Fe-30%Mn alloys appears to be closely related not only to the initial amounts of E martensite but to the strain induced transformation (γ→ε and ε→α`) occurring during each stages of deformation.
신현호,김철수,김창욱,장순남,성완,장동환,강석원,최석홍,Shin, Hyun-Ho,Kim, Chool-Soo,Kim, Chang-Wook,Chang, Soon-Nam,Sung, Wan,Chang, Dong-Hwan,Kang, Suk-Won,Choi, Suk-Hong 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.1
Mullitization in a multicomponent oxide system(alumina-kaolin-quartz-feldspar-talc) was studied as a function of sintering temperature from 1200 to 1500$^{\circ}C$ based upon a quantitative X-ray diffraction analysis. In the present study mullite grew as wiskers and its formation reaction showed characteristic there stages as follows In the first stage(1255-1295$^{\circ}C$) an appreciable mullitization(nucleation) occurred while corun-dum dissolution into glass (increasing glass content ) limited the rate of the reaction. At 1295-1335$^{\circ}C$ (second state) the reaction was significantly enhanced with a considerable glass consumption and with no appreciable change in corundum content. Finally (above 1335$^{\circ}C$) the reaction rate was attenuated re-markably with an apparent decrease in glass consumption rate. The impingement of mullite whiskers by oth-er whiskers and crystals was speculated to cause mullite growth in thickness direction with a slow growth rate resulting in the diminished reaction rate in the final stage.
김화중(H.J.Kim),최창(C.Choi),성완(Y.Sung),강기주(K.J.Kang) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
<br/> <br/> Mechanical behavior of a plate under mine explosion is explored using dynamic finite element analysis and the results are compared with experimental ones. For this dynamic analysis, we use a constitutive equation in which the strain rate effect is taken into acount. The mine blast energy transmitted to the plate is evaluated using semi-emperical approaches. The energy is assumed to be fully converted into kinetic energy of the plate, and then the initial velocity at every point of the plate is evaluated, which is used as the initial loading condition of the dynamic finite element calculation to estimate deformation of the plate. In comparison with the experimental results the estimation shows reasonable agreement. The effect of various boundary conditions are also examined.<br/>