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Activation of Carbon Fibers by KOH and Adsorption Characteristics for VOC
장진석,김인기,임굉,조성준,Jang, J.S.,Kim, I.K.,Yim, G.,Cho, S.J. Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.4
We intended to make the activated carbon fibers which could separate, remove and recover the volatile organic compounds of benzene, toluene, acetone and methanol. Changing activation temperature and time, large specific surface area and narrow pore distribution could be obtained. The activated carbon fibers have large adsorption capacity and selectivility for those organic compounds. We characterized the adsorption capability of the activated carbon fibers for benzene, toluene, acetone and methanol by BET specific surface area and pore size and micropore volume measurements. In the result of activation, the maximum value of BET specific surface area of the fibers was $1100\m^2$/g at $800^{\circ}C$ for 60 minutes and $K_2$O was reduced actively in this condition. Their average pore size was 5.8~5.9$\AA$. The activated carbon fibers prepared in this work had high adsorption rate to saturation and the selectibility for the above organic compounds. The adsorbed amount of acetone and methanol(diameter of$ 4.3\AA$ and $4.4\AA$ respectively) which are smaller than micropore diameter in size was 43~49%, which was larger value than benzene and toluene(in the same diameter as $5.9\AA$).
Prediction of interfacial behavior by mode of hybrid composite part using a cohesive zone model
J. S. Park(박준수),J. C. Ryu(류재창),J. S. Jang(장진석),J. H. Kim(김재홍),D. C. Ko(고대철) 한국소성가공학회 2021 한국소성가공학회 학술대회 논문집 Vol.2021 No.5
In recent years, the automotive industry has focused on reducing CO<sub>2</sub> emissions through the development of electric vehicles and the lightweight parts of vehicles according to the strict environmental regulations of each country. A direct method for lightweight vehicle parts is to use carbon fiber reinforced plastic(CFRP) to replace conventional metal parts or join Steel/CFRP as hybrid composite parts. Hybrid composite parts have superior specific strength, flexibility, and fatigue strength compared to the existing conventional parts. However, in the manufacturing process for these parts, interfacial failure may be occurred because of the difference in deformation characteristics, such as spring back and thermal contraction. Therefore, fractures at the interface between dissimilar materials should be predicted to manufacture the hybrid composite parts. The purpose of this study is to predict the interfacial behavior for hybrid composite parts manufactured by steel sheet and CFRP. In this study, steel sheet and CFRP were joined by epoxy resin impregnated in CFRP prepreg during the curing process. Double cantilever beam(DCB) test and end-notched flexure(ENF) test were performed to obtain various adhesion properties, such as critical energy release rate of Mode I, Mode II(G<sub>I</sub>, G<sub>II</sub>) and critical stress(σ<sub>max</sub>), respectively. Traction-separation law was used to describe the interfacial behavior between Steel/CFRP. Also, Finite element(FE) analysis with Cohesive zone model(CZM) was performed to predict adhesive failure and its results were compared with experimental ones. Finally, experimental drawing of steel/CFRP hybrid parts, such as DP980/CFRP and DP590/CFRP hybrid part is performed to investigate the interfacial behavior of steel and CFRP due to spring back. Adhesive failures at the interface of steel and CFRP observed in experimental drawing are quantitatively compared with those of FE simulation