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남정수 ( Nam Jeong-soo ),김홍섭 ( Kim Hong-seop ),최경철 ( Choe Gyeong-cheol ),이상규 ( Lee Sang-kyu ),손민재 ( Son Min-jae ),김규용 ( Kim Gyu-yong ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
The aim of this study is to investigate the impact resistant performance of steel short fiber-reinforced cement based composites (SFRCCs) containing 1.0, 1.5, 2.0 and 3.0% volume fraction of steel short fibers subjected to high velocity impact of steel projectile (the diameter of 19.05mm and the mass of 28.13g). The gunpowder impact facility was used for impact tests, and the impact velocity was from about 350 to 700m/s. The specimens were damaged in various failure modes, which are penetration, scabbing, and perforation. Comparing with Plain specimen, SFRCCs have superior capacity on the scabbing limit, and slightly bulged in the back side under the impact velocity of 700m/s. In addition, the impact resistant performance of SFRCCs improved with increase of steel short fiber volume ratio. The fibers play an important role in controlling the local damage of SFRCCs.
폐 스테인레스강 단섬유로 강화한 알루미늄 복합분말의 자기펄스압 성형 및 소결 특성
현창용,원철현,박재순,Hyun, Chang-Yong,Won, Chul-Hyun,Park, Jae-Soon 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
Characteristics of Al-based composites with waste stainless steel short fiber, fabricated by magnetic pulsed compaction and sintering were investigated. The compacts prepared by magnetic pulsed compaction showed high relative density and homogeneous microstructure compared with that by conventional press compaction. The relative density of sintered composites at $430^{\circ}C$ for 1 h exhibited the same value with compacts and decreased with increase in STS short fiber content. The reaction between Al and STS phase was confirmed by the microstructural analysis using EDS. The sintered composites, prepared by magnetic pulsed compaction, showed increased hardness value with increasing STS fiber content. Maximum yield strength of 100 MPa and tensile strength of 232 MPa were registered in the AI-based composite with 30 vol% STS short fiber.
Narawit Hemstapat,Kazumasa Okubo,Junichiro Niwa,Mitsuyasu Iwanami 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.5
This research aimed to estimate the shear capacity of reinforced concrete short beams with steel fiber (RSF short beams) using DIC (digital image correlation). Four-point bending tests of RSF short beams with shear span ratio (a/d) of 1.0, 1.5, and 2.0 were conducted. 0.5% or 1.0% volume fraction of steel fiber was used. The distribution of minimum principal strain (Ɛ2) was obtained from DIC then the width of compressive strut was evaluated. The effects of volume fraction of steel fiber and shear span ratio were investigated. Finally, the shear capacity of RSF short beams was estimated with the help of DIC.
탄소나노튜브와 스테인레스강 단섬유를 함유한 폴리프로필렌 복합체의전기저항 및 기계적 특성
정종기(Jong Ki Jung),박기훈(Ki Hun Park),방대석(Dae Suk Bang),오명훈(Myung Hoon Oh),김봉석(Bong Seok Kim),이종근(Jong Keun Lee) 한국고분자학회 2014 폴리머 Vol.38 No.2
본 연구에서는 이축 스크류식 압출기를 이용하여 폴리프로필렌(PP)에 도전성 필러인 다중벽 탄소나노튜브(MWNT)와 스테인레스강 단섬유(SSF)를 첨가하여 복합체를 제조하였으며, 이에 대한 표면저항 및 기계적 특성을조사하였다. 표면저항을 측정한 결과 PP/MWNT에 소량의 SSF를 첨가하였을 때 더 낮은 MWNT 함량에서percolation threshold가 나타났다. 그리고 제조된 복합체에 대한 인장시험 결과 순수 PP와 비교해서 파괴점 신장률은 감소하였으나 탄성률과 강도는 증가하였다. 또한 동역학분석을 통하여 MWNT와 SSF 복합체의 저장탄성률과tan δ에 미치는 영향을 조사하였으며, SEM을 이용하여 필러들의 모폴로지 및 복합체의 파단면을 관찰하였다. Polypropylene (PP) composites containing conductive multi-walled carbon nanotube (MWNT) and stainless steel short fiber (SSF) were manufactured using a twin screw extruder and characterized their surface resistivity and mechanical properties in this work. Surface resistivity measurements showed that the percolation threshold appeared at a lower MWNT loading when a small amount of SSF was added to PP/MWNT composites. Tensile modulus and strength of the composites increased but elongation-at-break decreased greatly compared to pure PP. Also, the effects of MWNT and SSF on storage modulus and tan δ from dynamic mechanical analysis for the composites were examined, and the morphologies of fractured surface and the fillers were observed using a scanning electron microscope.