• Title/Summary/Keyword: Bonding property

Search Result 22, Processing Time 1.424 seconds

Study on the Bonding Property and Strength Evaluation in Bonding Interface Joints of Dissimilar Material using Response Surface Analysis (반응표면법을 이용한 이종재질의 접합 계면부 강도평가 및 접합특성에 관한 연구)

  • Lee, Seung-Hyun;Choi, Seong-Dae;Kim, Gi-Man;Lee, Jong-Hyung
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.8 no.2
    • /
    • pp.76-82
    • /
    • 2009
  • In this papers, Study on the Bonding property and Strength Evaluation in Bonding interface Joints of Dissimilar material using DOE. We found optimal condition that uses experimental design method (Response Surface Analysis, DOE) used temperature, pressure, time on experiment factor. And we could get bonding condition and strength that break and crack do not happen in mechanical processing about united dissimilar material. And progress 3 point bending tests and verified result.

  • PDF

Engineering Property of Basalt Fiber as a Reinforcing Fiber (보강 섬유로서 현무암 섬유의 공학적 특성)

  • Choi, Jeong-Il;Jang, Yu-Hyun;Lee, Jae-Won;Lee, Bang-Yeon
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.3 no.1
    • /
    • pp.84-89
    • /
    • 2015
  • Basalt fiber has many advantages as a reinforcing fiber such as high tensile strength and similar density to concrete. This study investigated the bonding property and the effect of fiber orientation on tensile strength of basalt fiber. Single fiber pullout tests for basalt and polyvinyl alcohol (PVA) fibers were performed to evaluate the bonding property between basalt fiber and mortar. And then tensile strength of basalt, PVA, and polyethylene (PE) fibers according to fiber orientation were measured. From the test results, it was exhibited that the chemical bond, frictional bond, and slip-hardening coefficient of basalt fiber were 1.88, 1.03, 0.24 times of PVA fibers, respectively. And the strength reduction coefficient of basalt fiber was 9 times of PVA fiber and 3 times of PE fiber.

Effect of Pull-out Property by Shape and Mechanical Property of Reinforcing Fiber on the Flexural Behavior of Concrete (보강섬유의 형상과 물성에 따른 인발특성이 콘크리트의 휨거동에 미치는 영향)

  • Kim, Hong-Seop;Nam, Jeong-Soo;Kim, Jung-Hyun;Han, Sang-Hyu;Kim, Gyu-Yong
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.18 no.5
    • /
    • pp.41-50
    • /
    • 2014
  • This study evaluated the bonding property of fiber and flexural behavior of fiber reinforced concrete. Amorphous steel fiber, hooked steel fiber and polyamide fiber was used for evaluation of bonding property and flexural behavior. As a result, the hooked steel fiber was pulled out from matrix when peak stress. However amorphous steel fiber occurred shear failure because bonding strength between fiber and matrix was higher than tensile strength of fiber. Polyamide fibers occurred significantly displacement to peak stress because of elongation of fiber. After that peak stress, fiber was cut off. Amorphous steel fiber reinforced concrete had a greater maximum flexural load compared with hooked steel fiber reinforced concrete because bonding performance between fiber and matrix was high and mixed population of fiber was many. However flexural stress was rapidly reduced in load-deflection curve because of shear failure of fiber. Flexural stress of hooked steel fiber reinforced concrete was slowly reduced because fiber was pulled out from the matrix. In the case of polyamide fiber reinforced concrete, flexural stress was rapidly lowered because of elongation of fiber. However flexural stress was increased again because of bonding property between polyamide fiber and matrix. The pull-out properties of the fiber and matrix has effect on the deformation capacity and flexural strength of fiber reinforced concrete.

Spectroscopic Properties and Ligand Field Analysis of cis-Dinitrato(1,4,8,11-tetraazacyclotetradecane)chromium(III) Nitrate

  • 최종하
    • Bulletin of the Korean Chemical Society
    • /
    • v.18 no.8
    • /
    • pp.819-823
    • /
    • 1997
  • The luminescence and photoexcitation spectra of cis-[Cr(cyclam)(NO3)2]NO3·½ H2O (cyclam=1,4,8,11-tetraazacyclotetradecane) taken at 77 K are reported. The infrared and visible spectra at room-temperature are also measured. The vibrational intervals of the electronic ground state are extracted from the far-infrared and emission spectra. The ten electronic bands due to spin-allowed and spin-forbidden transitions are assigned. With observed transitions, a ligand field analysis has been performed to determine the bonding property of nitrate group in the chromium(Ⅲ) complex. According to the results, it is found that nitrate ligand has weak σ- and π-donor properties toward chromium(Ⅲ).

Bond Strength between Steel and Concrete with Different Diameters in the Same Corrosion Rate (직경별 부식 철근과 콘크리트 간의 부착강도에 관한 연구)

  • Du, Rujun;Jang, Indong;Lee, HyeRin;Yi, Chongku
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2020.11a
    • /
    • pp.190-191
    • /
    • 2020
  • The bonding of steel bar to concrete is closely related to the roughness and corrosion degree of steel bar surface. The accelerated corrosion of concrete specimens with different reinforcement diameters was carried out in this test. Through the pullout test of the corroded concrete specimens, the relationship between the bond stress and the displacement of the corroded concrete specimens under the corresponding corrosion degree was obtained. The bond stress of reinforced concrete with different size and corrosion degree are compared and analyzed to find out the influence of corrosion on the bonding property of reinforced concrete.

  • PDF

Bonding Property of Silicon Wafer Pairs with Annealing Method (열처리 방법에 따른 실리콘 기판쌍의 접합 특성)

  • 민홍석;이상현;송오성;주영창
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.16 no.5
    • /
    • pp.365-371
    • /
    • 2003
  • We prepared silicon on insulator(SOI) wafer pairs of Si/1800${\AA}$ -SiO$_2$ ∥ 1800${\AA}$ -SiO$_2$/Si using water direct bonding method. Wafer pairs bonded at room-temperature were annealed by a normal furnace system or a fast linear annealing(FLA) equipment, and the micro-structure of bonding interfaces for each annealing method was investigated. Upper wafer of bonded pairs was polished to be 50 $\mu\textrm{m}$ by chemical mechanical polishing(CMP) process to confirm the real application. Defects and bonding area of bonded water pairs were observed by optical images. Electrical and mechanical properties were characterized by measuring leakage current for sweeping to 120 V, and by observing the change of wafer curvature with annealing process, respectively. FLA process was superior to normal furnace process in aspects of bonding area, I-V property, and stress generation.

Cold Roll Bonding of (Ag-10% Ni)/Cu Clad Metals ((Ag-10 % Ni)/Cu 접점재의 냉간압연접합)

  • 김종헌;김성일;박상용
    • Transactions of Materials Processing
    • /
    • v.6 no.2
    • /
    • pp.136-144
    • /
    • 1997
  • (Ag-10%Ni)/Cu clad metals for electric contact switch were fabricated by cold-roll bonding process. 2 or 3 passes of cold-rolling was carried out for each process to investigate the effect of the rolling passes on the bonding property. The effect of the annealing temperature of copper before the cold-roll bonding on the bond strength was also studied. The specimen bonded with copper annealed below 30$0^{\circ}C$ before roll bonding showed good bond strength. This is because high stored energy in copper promoted the short range diffusion and the grain refinement of copper by the static recrystallization increased the degree of the interfacial coherency. The maximum peel strength of clad metals bonded with Cu annealed below 30$0^{\circ}C$ was 120N.

  • PDF

Characteristics of Cladding Process with High Viscosity Mixing Powder Using $CO_2$ Laser ($CO_2$ 레이저를 이용한 고점성 혼합분말의 클래딩 가공 특성)

  • 이영곤;전병철;오동수;서병권;김재도
    • Proceedings of the KWS Conference
    • /
    • 2000.10a
    • /
    • pp.256-259
    • /
    • 2000
  • High viscosity mixing powder is a very useful material for laser cladding. This material has a high viscosity so that it can be sticked to substrate. Therefore, Laser cladding can be performed on a curved or slope surface. Laser cladding can be easily performed with the material instead of wire that is difficult to be manufactured in some case. In this experiment, it was used a high viscosity mixing powder which consists of a high temperature flux and a bronze powder. And AC2B alloy material was used as a substrate. Flux prevents the clad layer from being oxidized and increases bonding property between substrate and cladding material. It makes possible to laser cladding at low level energy.

  • PDF

A Study on Bond Properties of Plymer Cement Mortar (폴리머시멘트모르터의 부착특성에 관한 연구)

  • Park, Kyung-Sang;Lee, Woong-Jong;Chae, Jae-Hong;Lee, Jong-Ryul;Choi, Long
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1999.04a
    • /
    • pp.203-208
    • /
    • 1999
  • The purpose of this study is to examine the bond properties of polymer cement mortar. Generally, cement mortar using polymer has been used that recovering the deteriorative concrete structure performance. In this case, it is very important problem to become a monolithic construction by bonding property. In this study, it is evaluated with other properties that adhesion strength between polymer cement mortar and concrete substrate. And polymer cement mortar was compared with plain cement mortar by scanning electron microscope.

  • PDF

Repair and Retrofit System of Concrete Structures using Fiber Glass and Epoxy Composite Sheets, Improved Through Utilization of Silica fume and Mechanical Saturator (실리카흄과 현장기계함침을 이용한 유리섬유 복합재(CAF)의 콘크리트 구조물 보수보강공법)

  • 유용하;권성준
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2000.10a
    • /
    • pp.785-792
    • /
    • 2000
  • Repair and retrofit system of concrete structures has been developed from conventional reinforced concrete overlaying, steel plate bonding and recently to fiber composite systems. Research and study on carbon, aramid, and glass fiber composite system has been actively carried out from all over the world Glass fiber composite is proved to be competitive technically and enconomically, among fiber composite system. CAF system is a system developed locally using all domestic materal, glass fabric and epoxy, and improved in shear bonding property by utilizing silica fume mixed with epoxy. All the tests on material properties, structural behavior, constructiveness at site and quality control procedure proved to be most appropriate system so far developed. Futher research work is and will be under progress for utilization of this system which will be applied to more adverse situation.

  • PDF