• Title, Summary, Keyword: mechanical jointing method

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Connection Behavior of FRP Box Member of Connection Method (연결방법에 따른 FRP 박스 부재의 연결거동 특성)

  • Jang, Hwa-Sup;Kim, Ho-Sun;Kwak, Kae-Hwan
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.23 no.5
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    • pp.455-463
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    • 2010
  • This is a basic experimental study to apply FRP modular box member to a variety of construction structures exposed to flexural strength, such as a slab and a girder. Tests were conducted under various conditions in order to analyze jointing performance features of the developed FRP modular box member as a large section. For the methods of jointing FRP modular box member, chemical connection, mechanical connection, and a combination of both were used to test both vertical and horizontal jointing. As a result of the test, using urethane+two bolts+sheets was the most efficient method of connecting FRP modular box member, and confirmed the efficient behavior by a finite element analysis.

Development of Engineered Wood using Mechanical Jointing Methods with Large Elements (대형요소의 기계적 접합법을 이용한 공학목재 개발)

  • Park, Joo-Saeng;Shim, Kug-Bo;Kim, Kwang-Mo;Park, Moon-Jae;Cho, Sung-Taig;Kim, Wae-Jung
    • Journal of Korea Foresty Energy
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    • v.25 no.2
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    • pp.34-41
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    • 2006
  • In this study, new engineered woods, which can be used as structural members, are developed using three different mechanical jointing methods with large elements produced from logs in a high yield. Flitches of relatively large cross-section are produced from small or medium diameter logs, and are joined with steel bolts, wood dowesl and steel lag bolts. Static bending tests are performed for these three types of built-up beams. Built-up beams joined with steel bolts show $514kgf/cm^2$ for MOR and $129,000kgf/cm^2$ for MOE, which are close to those of typical structural glulams. In case that wood dowels and steel lag bolts are used, elements are isolated as load increases and resists the applied load individually. Therefore, built-up beams joined with wood dowels or steel lag bolts show almost half of steel bolts for both MOE and MOR. From the results of this study, it was indicated that bending properties of engineered woods manufactured using mechanical jointing methods with large elements are influenced mainly by jointing performance between each elements.

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Study on the Development of the Displacement and Strain Distribution Measurement Algorithm to the Open Hole Tension Test by Using the Digital Image Correlation (이미지 상관법을 이용한 원공 인장 시편 변위 및 변형율 측정을 위한 알고리즘 개발에 관한 연구)

  • Choi, In Young;Kang, Young June;Hong, Kyung Min;Lee, Hak Seong;Kim, Seong Jong
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.2
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    • pp.121-128
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    • 2016
  • The mechanical jointing method is very important in the machine parts and structure. They are used by the bolts and rivet because it is very convenient to replace the parts and the structure. However, the mechanical jointing methods using the bolt and rivet needed the open hole. The machine parts life cycle is reduced because this open hole created the stress concentration. Therefore, the measurement methods are needed to evaluate phenomenon of the stress concentration. This paper discusses the development of the measurement algorithm using the digital image correlation methods to measure the strain distribution of the open hole. To implement the measurement algorithm using the DIC, the LabVIEW 2010 programming tool was used. To measure the strain distribution of the open hole, the tensile specimens having an open hole are made by using the aluminum 6061-T6. To secure the reliability of measurement result using the DIC, the DIC measurement results and FEM analysis results were compared.

An Experimental Study on Connection System of FRP Modular Box Member (FRP 모듈형 박스 부재의 연결 시스템에 관한 실험적 연구)

  • Kwak, Kae-Hwan;Jang, Hwa-Sup;Yang, Dong-Woon;Kim, Ho-Sun
    • Journal of The Korean Society of Agricultural Engineers
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    • v.51 no.4
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    • pp.29-36
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    • 2009
  • This is a basic experimental study to apply FRP modular box member to a variety of construction structures exposed to flexural strength, such as a slab and a girder. Applying FRP modular box member to a real structure requires a large section. FRP box member was made into modular systems. Tests were conducted under various conditions in order to analyze jointing performance of the developed FRP modular box member as a large section. For the methods of jointing FRP modular box member, synthetic resins connection, mechanical connection, and a combination of both were used to test both length and breadth connection. As a result of the test, using urethane + two bolts + sheets was the most efficient method of connecting FRP modular box member. It is expected that the proposed joint system in this study will contribute to the increase of failure load and synthesis behavior of FRP modular box member.

Electro-mechanical properties of lap-jointed Bi-2223 tapes (Bi-2223테이프 겹치기 접합부(Lap-Joint)의 전기-기계적 특성)

  • Dizon, John Ryan C.;Dedicatoria, Marlon;Park, Sung-Taek;Jung, Yun-Chul;Shin, Hyung-Seop
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.285-286
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    • 2008
  • In practical applications of HTS tapes for electric devices such as coils and power cables, the jointing of HTS tapes is needed. In magnet applications superconducting joints are needed to achieve very low resistance at the joint, but for power device applications, a slightly higher joint resistance may be acceptable. In this study, an economical joint with good mechanical and electrical integrity could be achieved for Bi-2223 tapes which can be applicable to electric power applications. A lap joint method has been used. The joint resistance and strength of the jointed Bi2223 tapes have been evaluated. Electro-mechanical properties of the joint sample under tension have been examined and compared with the case of the single tapes.

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A Study on the Optimal Conditions of friction Welding for JLF & STS304 Using AE Technique (AE기법을 이용한 JLF/STS304이종재료의 최적 마찰용접조건에 관한 연구)

  • Yoon, Han-Ki;Lee, Sang-Pill;Kong, Yu-Sik;Lee, Jin-Kyung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.23 no.2
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    • pp.148-155
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    • 2003
  • Japanese low activation terrific steel(JLF) is a good material for the parts of heat exchanger such as blanket and diverter. At first, JLF was developed as a candidate for structural materials in nuclear fusion applications. However, the development of the jointing technique of JLF steel to other materials is important for wide applications of this material to the industry fields. Recently the jointing technologies including diffusion bonding, brazing, roll bonding, explosive bonding and hot iso-static pressing have been studied for the heterogeneous materials of JLF-1 steel(Fe-9Cr-2W-V-Ta) and stainless steel(STS304). Friction welding is one of the most popular welding methods for two different kinds of materials. In this paper, the JLF-1 steel was jointed to SIS304 by friction welding method and the optimal conditions of the friction welding discussed. Acoustic emission was used as a nondestructive technique to evaluate the weld quality in processing.

Adhesion between the Nylon Cylinder and Steel Shaft by Expansion Fit and Induction Heating (나일론 실린더와 강축의 열박음과 유도가열에 의한 접합의 연구)

  • Choi Sin-Jin;Kang Suk-Choon
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.2
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    • pp.139-147
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    • 2005
  • The lubricant impregnated MC nylon has good frictional properties, but its mechanical strength is inferior to steel for the mechanical elements. For the tribological application Nylon as gears, sliding bearings, cam and etc, the steel shafts are fitted in pre-heated nylon cylinder by a process of interference expansion fit and bonded by induction heating method. The joint shear strength of the two materials was measured by a universal test machine. From the study, the adhesive shear strength between these two materials was affected by the factors of the interference between nylon and steel, the size of nylon cylinder, knurl of steel shaft and inducting heating conditions. The most effective jointing conditions were analyzed and decided for the practical application in the industry.

A Study on the Evaluation of Tensile Performance According to Pareral Jointing Methods of the Sheet Membrane Waterproofing System (방수시트의 평행접합방법에 따른 인장성능 평가연구)

  • Lee Jeoung-Yun;Oh Mi-Hyun;Kwak Kyu-Sung;Oh Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • v.y2004m10
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    • pp.39-44
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    • 2004
  • A heat and room temperature construction method of asphalt have been mainly applying to rooftop waterproofing in concrete structure, and the rest construction method are sheet, membrane and mortar waterproofing construction method. In particular, joint method in sheet waterproof method is as overlap joint which on being reinforced with fiber and tape, have been applying for job site to mechanical fix using protection disk and anchorage and metal ironwork on the end of sheet. These construction method cause cutting off joint of sheet as behavior of structure according to repairs of sheet itself and thermal conduct, outdoor air environment. In conclusion, we analyzed and examined the application of various sheets and piece ashes about superior 'I' joint which divide from one and the other sheet and progressed about joint construction method of fixing method for overlap.

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The influence of residual stress on the engineering behaviour of rock (잔류응력이 암석의 공학적 거동에 끼치는 영향)

  • 박형동
    • Tunnel and Underground Space
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    • v.5 no.4
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    • pp.363-375
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    • 1995
  • Critical literature review in this study revealed that there can be a significant influence of the residual stress on the engineering properties of rock. The review also showed that few number of research works on the quantification of the influence was attributed to the limitation of the two classical measurement techniques, viz, X-ray diffraction and mechanical relaxation method. In this study, a new way of approach was sought based on the assumption that residual stress up to the failure. A series of hoop tests conducted onthe samples from the limb of Carboniferous Limestone in Clevedon, England, revealed that (i) there is no preferential orientations of microcracks and minerals which have been widely believed as the main source of the strength anisotropy of rock; (ii) the anisotropy of the tensile strength of the limestone results from the influence of the residual stress; (iii) since jointing commenced within the fold, residual stored strain energy has been released preferentially in the direction perpendicular to the major joints(o$^{\circ}$ and 90$^{\circ}$); (ⅳ) during the hoop test making it much easier to create tensile fracture in these directons, viz 45$^{\circ}$ and 135$^{\circ}$)was released during the hoop test making it much easier to create tensile fracture in these directions, viz 45$^{\circ}$and 135$^{\circ}$;(v) the direction in which the stored strain energy may be presumed to be the least, required the greatest work to cause failure.

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A study on the welding performance of korean automatic gas pressure welding machine by external appearance investigation (외관검사를 통한 한국형 철근자동가스압접기의 압접성능 연구)

  • Seo, Deok-Seok
    • Journal of the Korea Institute of Building Construction
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    • v.8 no.6
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    • pp.161-166
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    • 2008
  • This study is focused on the welding performance of automatic gas pressure welding machine adapted to korean construction site by external appearance investigation. As gas pressure welding is more economical and has good performances compared with other steel bar jointing methods, as arc welding and mechanical joint etc, in Japan, the gas pressure welding is one of the typical connection of steel reinforcement when connecting the D29 and thicker steel bars, But in Korea, gas pressure welding joint method is not widely used caused by the shortage of skilled workers. so to activate the gas pressure welding in Korea, the automatic gas pressure welding machine is developed. In this study, the welding performances of gas pressure welding joint samples using korean automatic gas pressure welding machine are measured by external appearance investigation - blown diameters, blown length, welding face disagreement, central axis eccentric ratio, bending, sag and crack. The results of welding performances on the gas pressure welding joint samples show that samples are satisfied with the standard value regulated in KS D 0244 and JIS Z 3120.