• Title/Summary/Keyword: face element

Search Result 457, Processing Time 0.026 seconds

Prediction of Cutting Temperature in Flank Face at High Speed Steel in Orthogonal Turning (2차원 선삭시 고속도강 공구의 플랭크면 절삭온도 예측)

  • Jun, Tae-Ok;Bae, Choon--Eak
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.20 no.1
    • /
    • pp.222-231
    • /
    • 1996
  • Temperature distribution on the flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junciton imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with igh speed steel. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.

A Study on Prediction of Cutting Temperature in Flank Face ar High Speed Steel (고속도강공구의 플랭크면 절삭온도 예측에 관한 연구)

  • 전태옥;배춘익
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.19 no.1
    • /
    • pp.45-53
    • /
    • 1995
  • Temperature distribution on flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with high speed steel. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.

  • PDF

Burr Prediction via Finite Element Method and Burr Formation Characteristics in Metal Cutting Process (유한요소법을 이용한 절삭가공 Burr 예측과 생성특성 연구)

  • Hwang, Joon;Hwang, Duk-Chul;Woo, Chang-Gi;Yang, Kea-joon
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2001.04a
    • /
    • pp.1000-1003
    • /
    • 2001
  • This paper presents the numerical analysis and experimental verification to know the metal cutting burr formation mechanism in face milling operation. Finite element method are applied to predict the 2-D burr formation process prediction. Face milling process are adjusted to analyze the characteristics of burr shapes according to various cutting conditions. The cutting parameters were investigated with cutting speed, feed rate, depth of cut. Through the experiments various burr types are classified according to its shape and properties.

  • PDF

The Property of Formative Factor Influencing Preference on Robot's Design (로봇디자인에 대한 선호 반응에 영향을 미치는 조형요소의 특성)

  • Jeong, Jeong-Pil;Heo, Seong-Cheol
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
    • /
    • 2008.10a
    • /
    • pp.38-41
    • /
    • 2008
  • This study's basic intention is to analyze property of combination relations of formative element composing robot' s face based on a result of preference response on robot's design. Also, in order to improve preference from the analysis result, the study intended to inquire into possibilities of suggesting design guideline. For the above, photographs of 27 robots' faces were selected as a experimental stimuli, and experiments on preference response and association response were performed. As a result, various properties such as robots' form of eyes having greater influences than facial structure, etc. Based on the result, each formative element's property that could have positive influence preference response on robot's face could be drawn and basic design guideline could also be suggested.

  • PDF

Analytical behavior of longitudinal face dowels based on an innovative interpretation of the ground response curve method

  • Rahimpour, Nima;Omran, Morteza MohammadAlinejad;Moghaddam, Amir Bazrafshan
    • Geomechanics and Engineering
    • /
    • v.30 no.4
    • /
    • pp.363-372
    • /
    • 2022
  • One of the most frequent issues in tunnel excavation is the collapse of rock blocks and the dropping of rock fragments from the tunnel face. The tunnel face can be reinforced using a number of techniques. One of the most popular and affordable solutions is the use of face longitudinal dowels, which has benefits including high strength, flexibility, and ease of cutting. In order to examine the reinforced face, this work shows the longitudinal deformation profile and ground response curve for a tunnel face. This approach is based on assumptions made during the analysis phase of problem solving. By knowing the tunnel face response and dowel behavior, the interaction of two elements can be solved. The rock element equation derived from the rock bolt method is combined with the dowel differential equation to solve the reinforced ground response curve (GRC). With a straightforward and accurate analytical equation, the new differential equation produces the reinforced displacement of the tunnel face at each stage of excavation. With simple equations and a less involved computational process, this approach offers quick and accurate solutions. The FLAC3D simulation has been compared with the suggested analytical approach. A logical error is apparent from the discrepancies between the two solutions. Each component of the equation's effect has also been described.

Seepage Face and Reliability Indexes of Anisotropic Homogenous Dam at Steady State Condition (비등방 균질 댐의 정상상태에서의 침투면과 신뢰성지수)

  • Mahmood, Khalid;Kim, Jin-Man
    • Journal of the Korean Geotechnical Society
    • /
    • v.28 no.4
    • /
    • pp.35-42
    • /
    • 2012
  • This paper evaluates the effect of anisotropic conductivity on the seepage face and reliability index of an homogeneous dam with and without toe drain. The analysis are conducted under steady state saturated-unsaturated seepage condition using finite element method. Various anisotropic conductivity ratios were interpreted under such conditions as the vertical conductivity is reduced while the horizon conductivity is fixed. The shear strength of soil is defined by the modified Mohr-Coulomb failure criterion. The analysis results demonstrate that the length of seepage face and reliability index at the downstream and upstream of the dam increase with an increasing anisotropic ratio. These results of the seepage face and reliability index, however, depend on the total head difference between the upstream slope and downstream toe. The difference in seepage face and reliability index is attributed to the different equipotential head with different anisotropic ratios of the dam material.

A FINITE ELEMENT AND STRAIN GAUGE ANALYSIS ON THE DISPLACEMENT OF CRANIOFACIAL COMPLEX WITH CERVICAL HEADGEAR (경부고정(頸部固定) headgear 사용시(使用時) 안면두개골(顔面頭蓋骨)의 변위(變位)에 관(關)한 장력계측법(張力計測法) 및 유한요소법적(有限要素法的) 연구(硏究))

  • Kim, Hyun-Soon;Nahm, Dong-Seok
    • The korean journal of orthodontics
    • /
    • v.17 no.2
    • /
    • pp.185-200
    • /
    • 1987
  • This paper was undertaken to observe the displacement of craniofacial complex with cervical headgear and to compare narrowing or widening effect of palate by use of contraction or expansion face-bow, respectively. The 3-dimensional finite element method(FEM) was used for a mathematical model composed of 597 nodes and 790 elements and an electrical resistance strain gauge investigation was performed to validate the finite element model. The outer bow of cervical headgear was adjusted to be placed below the occlusal plane by $25^{\circ}$ and met the midsagittal plane by $40^{\circ}$, and was loaded 1kg on each right and left hook toward posterior direction. The results were as follows 1. Generally, the maxillary teeth and facial bone were displaced in posterior, medial and downward direction. 2. It was the maxillary 2nd bicuspid that moved bodily. 3. The craniofacial complex rotated in a clockwise direction around the rotating axis which lay from the most posterior and lowest point connecting nasal crest of maxillary bone and vomer, progressively toward a more posterior, lateral and upward direction, anterior and upper area of pterygomaxillary fissure, base of medial pterygoid plate and laterally to the contact area of zygomatic arch with squamous part of temporal bone. 4. No contraction effect was observed by contraction face-bow when compared to the standard face-bow. 5. In case of expansion face-bow, the areas of maxillary 2nd bicuspid, molars and palate were expanded remarkably.

  • PDF

A Study on the Root Fillet Stress Analysis of Helical Gear due to Helix Angle and Face Width (헬리컬기어에서 나선각과 치폭의 변화에 따른 이뿌리응력에 관한 연구)

  • Han, An-Su;Hong, Min-Sung;Cho, Jin
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.16 no.4
    • /
    • pp.45-50
    • /
    • 2007
  • In this paper, the FEM(Finite Element Method) has been applied to understand the geometrical characteristics and to analyze the stress of a helical gear. The helical gear is simulated and analyzed by adding many thin spur gear with helix angles and twist angles. Helical gears with different helix angle and face width have been studied. The results show that the root fillet stress is increased proportionally to helix angle and face width. Namely, as the face width increases, root fillet stress decreases, and as helix angle gets bigger, root fillet stress increases.

Effect of Tunnel Advance Rate on the Seepage Forces Acting on the Tunnel Face (터널굴진율이 막장에서의 침투력에 미치는 영향에 관한 연구)

  • 남석우;이인모
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2002.10a
    • /
    • pp.327-333
    • /
    • 2002
  • In this study, the effect of tunnel advance rate on the seepage forces acting on the tunnel face was studied. The finite element program to analyze the groundwater flow around a tunnel with the consideration of tunnel advance rate was developed. Using the program, the parametric study for the effect of the tunnel advance rate and hydraulic characteristics of the ground on the seepage forces acting on the tunnel face was studied. From this study, it was concluded that the tunnel advance rate must be taken into consideration as an additional parameter to assess the seepage forces at the tunnel face and a rational design methodology for the assessment of support pressures required for maintaining the stability of the tunnel face was suggested for underwater tunnels.

  • PDF

Evaluation of seismic criteria of built-up special concentrically braced frames

  • Izadi, Amin;Aghakouchak, Ali A.
    • Steel and Composite Structures
    • /
    • v.29 no.1
    • /
    • pp.23-37
    • /
    • 2018
  • In this paper, seismic provisions related to built-up special concentrically braced frames (BSCBFs) are investigated under cyclic loading using non-linear finite element analysis of a single-bay single-story frame. These braces, which contain double angle and double channel brace sections, are considered in two types of single diagonal and X-braced frames. The results of this study show that current seismic provisions such as observing the 0.4 ratio for slenderness ratio of individual elements between stitch connectors are conservative in BSCBFs, and can be increased according to the type of braces. Furthermore, such increments will lead to decreasing or remaining the current middle protected zone requirements of each BSCBFs. Failure results of BSCBFs, which are related to the plastic equivalent strain growth of members and ductility capacity of the models, show that the behaviors of double channel back-to-back diagonal braces are more desirable than those of similar face-to-face ones. Also, for double angle diagonal braces, results show that the failure of back-to-back BSCBFs occurs faster in comparison with face-to-face similar braces. In X-braced frames, cyclic and failure behaviors of built-up face-to-face models are more desirable than similar back-to-back braces in general.