• Title/Summary/Keyword: cross section shape

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A Study on the 3-D CNC Cutting Planning and Simulation by Z-Map Model (Z-Map 모델을 이용한 3차원 CNC 가공계획 및 절삭시뮬레이션에 관한 연구)

  • 송수용;김석일
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.683-688
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    • 1994
  • Recently, the Z-Map model has been used widely to represent the three dimensional geometric shape and to achieve the cross-section and point evaluation of the shape. In this paper, the CNC cutting planning and simulation modules for product with three dimensional geometric shape are realized based on the Z-Map model. The realized system has the various capabilities related to the automatic generation of tool path for the rough and finish cutting processes, the automatic elimination of overcut, the automatic generation of CNC program for a machining center and the cutting simulation. Especially, the overcut-free tool path is obtained by using the CL Z-Map models which are composed of the offset surfaces of the geometric shape of product.

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A study on the 3-D CNC cutting planning and simulation by Z-Map model (Z-Map모델을 이용한 3차원 CNC가공계획 및 절삭시뮬레이션에 관한 연구)

  • Song, Soo-Yong;Kim, Seok-Il
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.5
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    • pp.115-121
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    • 1996
  • Recently, the Z-Map model has been used widely to represent the three dimensional geometric shape and to achieve the cross-section and point evaluation of the shape. In this paper, the CNC cutting planning and simulation modules for product with three dimensional geometric shape are realized based on the Z-Map model. The realized system has the various capabilities related to the automatic generation of tool path for the rough and finish cutting processes, the automatic elimination of overcut, the automatic generation of CNC program for a machining center and the cutting simulation. Especially, the overcut-free tool path is obtained by using the CL Z-Map models which are composed of the offset surfaces of the geometric shape of product.

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Finite element modelling and design of partially encased composite columns

  • Chicoine, Thierry;Tremblay, Robert;Massicotte, Bruno
    • Steel and Composite Structures
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    • v.2 no.3
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    • pp.171-194
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    • 2002
  • In this paper, the behaviour of axially loaded partially encased composite columns made with light welded H steel shapes is examined using ABAQUS finite element modelling. The results of the numerical simulations are compared to the response observed in previous experimental studies on that column system. The steel shape of the specimens has transverse links attached to the flanges to improve its local buckling capacity and concrete is poured between the flanges only. The test specimens included 14 stubcolumns with a square cross section ranging from 300 mm to 600 mm in depth. The transverse link spacing varied from 0.5 to 1 times the depth and the width-to-thickness ratio of the flanges ranged from 23 to 35. The numerical model accounted for nonlinear stress-strain behaviour of materials, residual stresses in the steel shape, initial local imperfections of the flanges, and allowed for large rotations in the solution. A Riks displacement controlled strategy was used to carry out the analysis. Plastic analyses on the composite models reproduced accurately the capacity of the specimens, the failure mode, the axial strain at peak load, the transverse stresses in the web, and the axial stresses in the transverse links. The influence of applying a typical construction loading sequence could also be reproduced numerically. A design equation is proposed to determine the axial capacity of this type of column.

Structural Performance of Y Type Plate Connection between Circular CFT Column and H Shape Steel Beam (Y형 플레이트를 적용한 원형 CFT 기둥-H형강 보 접합부의 구조성능)

  • Jo, Hyun-Kook;Choi, Chang-Sik
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.6
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    • pp.112-118
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    • 2015
  • These days, there are lots of skyscrapers being constructed in downtown areas. However, it requires columns which have a way heavier load. and far more extensive cross sections of column as well. Therefore, it is hard to lay the foundation in downtown areas. This being the case, composite columns such as CFT column are primarily being used. However, CFT column is occurred of difficult beam-column connection development and lower performance since CFT column is closed cross-section. Especially, the result of the study concerning development of connection details with CFT column and exterior diaphragms are very low in current state. In this study, through developing CFT column-H shape steel beam applicating Y shape plate, set width and depth of Y shape plate which affect structural performance of connection details applicating Y shape plate as main variables, and evaluate structural performance through experiments. And also, design Y shape plate used at experiments as setting allowable stress for tension suggested at design criteria lower than axial force of tension side flange connected Y shape plate, through shape of destruction, verify the structural safety and performance of Y shape plate.

Three-dimensional evaluation of the relationship between nasopharyngeal airway shape and adenoid size in children

  • Oh, Kyung-Min;Kim, Min-Ah;Youn, Jong-Kuk;Cho, Hyung-Jun;Park, Yang-Ho
    • The korean journal of orthodontics
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    • v.43 no.4
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    • pp.160-167
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    • 2013
  • Objective: To evaluate the shapes and sizes of nasopharyngeal airways by using cone-beam computed tomography and to assess the relationship between nasopharyngeal airway shape and adenoid hypertrophy in children. Methods: Linear and cross-sectional measurements on frontal and sagittal cross-sections containing the most enlarged adenoids and nasopharyngeal airway volumes were obtained from cone-beam computed tomography scans of 64 healthy children ($11.0{\pm}1.8$ years), and the interrelationships of these measurements were evaluated. Results: On the basis of frontal section images, the subjects' nasopharyngeal airways were divided into the following 2 types: the broad and long type and the narrow and flat type. The nasopharyngeal airway sizes and volumes were smaller in subjects with narrow and flat airways than in those with broad and long airways (p < 0.01). Children who showed high adenoid-nasopharyngeal ratios on sagittal imaging, indicating moderate to severe adenoid hypertrophy, had the narrow and flat type nasopharyngeal airway (p < 0.01). Conclusions: Cone-beam computed tomography is a clinically simple, reliable, and noninvasive tool that can simultaneously visualize the entire structure and a cross section of the nasopharyngeal airway and help in measurement of adenoid size as well as airway volume in children with adenoid hypertrophy.

A Comparative Analysis of Existing Channel-Type Lining Board and New-Type lining Board Models (기존 채널형 복공판과 새로운 복공판 모델에 관한 비교분석 연구)

  • Kim Doo-Hwan;Kim Young-Sei
    • Journal of the Korean Society of Safety
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    • v.19 no.3 s.67
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    • pp.78-83
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    • 2004
  • The channel-type lining board that partial welded on many partition frames is used to normal servicing lining board type. On this study is to investigate existing channel-type lining board's capacity by using the static loading test. From this study, to develop new-type lining board which reflect well cross section area and sectional modulus of existing channel-type lining board. Six types FEM model are adopted. The accumulated test results of stress conditions and deflections by section shapes will be used to analyzed the relation between the capacity and the section shape. With the comparing the results of static loading test and FEM analysis.

Dynamic Response Analysis of Open Section Structures with Warping Restraint Conditions and Impact Load Durations

  • Chun, Dong-Joon
    • International Journal of Advanced Culture Technology
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    • v.8 no.2
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    • pp.159-164
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    • 2020
  • The response analysis of frame structure with open section beams considering warping conditions and short duration load have been performed. When a beam of frame structure is subjected under torsional moment, the cross section will deform a warping as well as twist. For some thin-walled sections warping will be large, and accompanying warping restraint will induce axial and shear stresses and reduce the twist of beam which stiffens the beam in torsion. Because of impact or blast loads, the wave propagation effects become increasingly important as load duration decreases. This paper presents that a warping restraint in finite element model effects the behavior of beam deformation, dynamic mode shape and response analysis. The computer modelling of frame is discussed in linear beam element model and linear thin shell element model, also presents a correlation between computer predicted and actual experimental results for static deflection, natural frequencies and mode shapes of frame. A method to estimate the number of normal modes that are important is discussed.

Shape Design of Initial Section for Non-circular Shaped Mold Spring (비원형 단면을 갖는 금형스프링의 단면설계)

  • Lee, Hyoungwook;Choi, Hwaryong
    • Journal of Institute of Convergence Technology
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    • v.1 no.1
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    • pp.24-28
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    • 2011
  • The purposes of this study are predictions of the changes in the section geometry and determination of the initial cross section so that opposite side in height direction is exactly parallel after coiling process. Finite element analysis is carried out for the calculation of the sectional changes for mold spring item. Analysis results reveal that the slope of the top and bottom sides varies in the range of 5 to 8 degrees and the amount depends on the dimension of the outer diameter. The slopes of the sides should be defined first among design variables.

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Analysis of composite girders with hybrid GFRP hat-shape sections and concrete slab

  • Alizadeh, Elham;Dehestani, Mehdi
    • Structural Engineering and Mechanics
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    • v.54 no.6
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    • pp.1135-1152
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    • 2015
  • Most of current bridge decks are made of reinforced concrete and often deteriorate at a relatively rapid rate in operational environments. The quick deterioration of the deck often impacts other critical components of the bridge. Another disadvantage of the concrete deck is its high weight in long-span bridges. Therefore, it is essential to examine new materials and innovative designs using hybrid system consisting conventional materials such as concrete and steel with FRP plates which is also known as composite deck. Since these decks are relatively new, so it would be useful to evaluate their performances in more details. The present study is dedicated to Hat-Shape composite girder with concrete slab. The structural performance of girder was evaluated with nonlinear finite element method by using ABAQUS and numerical results have been compared with experimental results of other researches. After ensuring the validity of numerical modeling of composite deck, parametric studies have been conducted; such as investigating the effects of constituent properties by changing the compressive strength of concrete slab and Elasticity modulus of GFRP materials. The efficacy of the GFRP box girders has been studied by changing GFRP material to steel and aluminum. In addition, the effect of Cross-Sectional Configuration has been evaluated. It was found that the behavior of this type of composite girders can be studied with numerical methods without carrying out costly experiments. The material properties can be modified to improve ultimate load capacity of the composite girder. strength-to-weight ratio of the girder increased by changing the GFRP material to aluminum and ultimate load capacity enhanced by deformation of composite girder cross-section.

Comparison of Elderly Male's Bodice Pattern -focused on 70's and 80's

  • Cha, Su-Joung
    • Journal of the Korea Society of Computer and Information
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    • v.25 no.6
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    • pp.143-154
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    • 2020
  • In this study, four types of bodice patterns of elderly males in their 70s and 80s were made, and appearance evaluation was conducted through 3D simulation. For objective evaluation, airgap, cross section, color distribution, etc. were analyzed to compare differences between patterns. The pattern shape of bodice for elderly males was a pattern without darts except for the L pattern. As a result of appearance evaluation for 3D simulation, the elderly males' pattern was found to have a significant difference among the patterns on the front, side, and back items, and the H pattern was analyzed as the best pattern in all items except the armhole shape on the side. As a result of evaluating the airgap, color distribution, and cross-section, the most suitable pattern for the elderly male's body type was analyzed as the H pattern. Based on the H pattern, it is thought that the development of a pattern suitable for the upper body shape of elderly male should be made.