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이장하(J.H.Lee),이명호(M.H.Rhee),신광선(K.S.Shin) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Aluminum honeycomb panels have excellent specific strength and impact energy absorption property and thus have a great potential as light-weight structural materials. In this study, aluminum honeycomb panels were fabricated from 5052 aluminum alloy core and face sheets using adhesive films. The mechanical properties of these panels were<br/> characterized using compressive and tensile tests.<br/> The compressive<br/> <br/> strengths were found to be 4.91 I\1Pa and 2.51 I\1Pa for the panels with the cell sizes of 1/8 inch and 3/16 inch, respectively. The excellent energy absorption property of the honeycomb panel was caused by<br/> repetitive buckling of the core and the cushion strength was found to be 43% - 50% of the maximum compressive strength. The bond strength between the core and face sheets was determined from the tensile tests and found to be about 170 I\1Pa regardless of the cell size.<br/>
반용융 성형된 A357 합금 성형품의 부식 및 기계적 특성에 관한 연구
김상식,이명호,이정환,유영빈,이재식,이한중 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.8
The mechanical and corrosion properties of thixoformed A357 alloys were examined with different reheating temperatures, and the results were compared with those of permanent mold cast A357 alloys. It was found that the thixoforming process significantly improved the mechanical properties (i.e., tensile elongation, impact energy and resistance to fatigue crack propagation) and the corrosion resistance of A357 alloys. A 380% increase in tensile elongation and a 120% increase in impact energy were, for example, observed with thixoforming process of A357 alloy in the as-fabricated condition, as compared to the PMC counterparts. The impact energy was extremely sensitive to reheating temperature due to the coarsening of eutectic Si particles. The resistance to fatigue crack propagation for the thixoformed alloy was also much higher than that of permanent mold cast counterpart in the as-fabricated condition. The resistance to both general corrosion and stress corrosion cracking was also greatly improved with thixoforming process. The present observations strongly suggest that the enhancement with thixoforming A357 alloy is largely associated with the size and shape of eutectic Si particles.