• Title/Summary/Keyword: Von mises stress

Search Result 534, Processing Time 0.029 seconds

한국형 고속전철의 답면제동에 의한 차륜의 응력분포에 관한 연구 (A Study on Stress Distribution of Korean High Speed Train Wheel at Tread Braking)

  • 권범진;정흥채;김호경
    • 한국철도학회논문집
    • /
    • 제5권3호
    • /
    • pp.167-173
    • /
    • 2002
  • The influence of thermal stress at tread breaking in Korean High Speed Train wheel was investigated using the coupled thermal-mechanical analysis technique. The mechanical load or wheel-rail contract load and braking load were considered during FEM analysis. During the stop braking, the effect of mechanical stress on the combined stress is relatively larger than that of thermal stress in the rim of wheel. However, the effect of thermal stress is relatively larger than that of mechanical stress in the plate of wheel. When 300% of the block force was applied, the maximum von Mises stress of 61.0 MPa was found at the outside plate around 400 mm far away from the wheel center.

다구찌 기법을 이용한 자동차 페달 암의 형상 최적설계 (Shape Optimal Design of an Automotive Pedal Arm Using the Taguchi Method)

  • 이부윤;이현우
    • 한국정밀공학회지
    • /
    • 제24권3호
    • /
    • pp.76-83
    • /
    • 2007
  • The Taguchi method is applied to obtain the optimal design of an automotive pedal arm in consideration of the stiffness test specification. Design parameters are defined to describe shape of the pedal arm. Volume, maximum Von-Mises stress and maximum displacement of the pedal arm are established as the smaller-the-better characteristics. Optimal parameters are determined on the basis of the analyzed level averages of the characteristics.

유한요소 해석방법을 이용한 스텐트와 혈관, Plaque의 상호작용에 관한 연구 (Finite Element Analysis of Stent Expansion Considering Stent, Artery and Plaque Interaction)

  • 김성민;박성윤
    • 한국정밀공학회지
    • /
    • 제23권10호
    • /
    • pp.121-125
    • /
    • 2006
  • In this paper, results are presented by nonlinear finite element simulations in order to analy the interactions between the stent and artery or plaque. Maximum of von Mises stress was calculated in the contacting areas between the stent and the artery. The simulated results show that the distal end of stent, which tilts after expansion, may injure the artery wall. In conclusion, this study may help designing new stents.

한국형 고속전철 관절장치의 구조해석 (Finite Element Analysis of the Gangway of a Korea High Speed Train)

  • 노규석;이상록;강재윤
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2001년도 춘계학술대회 논문집
    • /
    • pp.222-229
    • /
    • 2001
  • This paper aims to verify the static strength of a KHST gangway structure including fixed ring and carrying ring according to tile load cases in the defined specification. The structure has been analyzed by the finite element method. Calculation carried out in tile fields of linearity and small deformation. The admissible limit is tile yield strength for the available materials. The analysis results show that Von-Mises stress at some locations of the structure is a little beyond the admissible limit. These results are successfully reflected on the adjusted design.

  • PDF

자동차용 공기압축기의 구조해석 (Structure Analysis of Vehicle Air Compressor)

  • 원종진;이종선;흥석주;이현곤
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 1999년도 춘계학술대회 논문집
    • /
    • pp.45-50
    • /
    • 1999
  • The object of this study is structure analysis of vehicle air compressor. Structure analysis is compose to nodal solution and element solution using ANSYS code. Then analysis is partition to head part, cylinder and piston part of vehicle air compressor. Stress and strain results are satisfy to Von Mises yield criterion.

  • PDF

원형공을 가진 보의 응력분포와 소성역 전파거동에 관한 연구 (A study on the stress distribution and plastic area propagation in the beams with a circular hole)

  • 김희철;왕지석;이경호
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제9권3호
    • /
    • pp.225-239
    • /
    • 1985
  • The beams with a circular hole are often used for constructing structures. The center of the circular hole is normally located in neutral axis and the stress state around the hole due to bending moment is trivial. But the stress level around the hole due to shear force is expected to be significant especially in the case of beams made of shape steels. In this paper, the stress distributions around the circular hole of beams were presented. Using polar coordinates and generallized stress function, the formulas of stress components were derived. The aspects of plastic area propagations based on von Mises yield criteria were also shown graphically. In order to verify the formulas presented in this paper, a beam of I-shape steel with a circular hole was made and the strains around the hole were measured under various loading conditions. The experimental results were proved to coincide fairly well with the calculated values.

  • PDF

임플랜트-지대주의 연결방법에 따른 임플랜트 보철의 유한요소 응력분석 (FINITE ELEMENT STRESS ANALYSIS OF IMPLANT PROSTHESIS ACCORDING TO CONNECTION TYPES OF IMPLANT-ABUTMENT)

  • 허진경;계기성;정재헌
    • 대한치과보철학회지
    • /
    • 제43권4호
    • /
    • pp.544-561
    • /
    • 2005
  • Purpose : This study was to assess the loading distributing characteristics of implant systems with internal connection or external connection under vertical and inclined loading using finite element analysis. Materials and methods : Two finite element models were designed according to type of internal connection or external connection The crown for mandibular first molar was made using cemented abutment. Each three-dimensional finite element model was created with the physical properties of the implant and surrounding bone This study simulated loads of 200N at the central fossa in a vertical direction (loading condition A), 200N at the centric cusp tip in a 15$^{\circ}$ inward inclined direction (loading condition B), or 200N at the centric cusp tip in a 30$^{\circ}$ outward inclined direction (loading condition C) respectively. Von Mises stresses were recorded and compared in the supporting bone, fixture, abutment and abutment screw. Results : 1. In comparison with the whole stress or the model 1 and model 2, the stress pattern was shown through th contact of the abutment and the implant fixture in the model 1, while the stress pattern was shown through the abutment screw mainly in the model 2. 2. Without regard to the loading condition, greater stress was taken at the cortical bone, and lower stress was taken at the cancellous bone. The stress taken at the cortical bone was greater at the model 1 than at the model 2, but the stress taken at the cortical bone was much less than the stress taken at the abutment, the implant fixture, and the abutment screw in case of both model 1 and model 2. 3. Without regard to the loading condition, the stress pattern of the abutment was greater at the model 1 than at the model 2. 4. In comparison with the stress distribution of model 1 and model 2, the maximum stress was taken at the abutment in the model 1. while the maximum stress was taken at the abutment screw in the model 2. 5. The magnitude of the maximum stress taken at the supporting bone, the implant fixture, the abutment, and the abutment screw was greater in the order of loading condition A, B and C. Conclusion : The stress distribution pattern of the internal connection system was mostly distributed widely to the lower part along the inner surface of the implant fixture contacting the abutment core through its contact portion because of the intimate contact of the abutment and the implant fixture and so the less stress was taken at the abutment screw, while the abutment screw can be the weakest portion clinically because the greater stress was taken at the abutment screw in case of the external connection system, and therefore the further clinical study about this problem is needed.

타원형 및 토리-구형 압력용기도옴의 두께 최적화설계 (Optimal Thickness Design of Ellipsoidal and Tori-Spherical Pressure Vessel Domes)

  • 이영신;김영완;조원만
    • 대한기계학회논문집
    • /
    • 제18권3호
    • /
    • pp.707-715
    • /
    • 1994
  • This study presents thickness optimization for the pressure vessel domes subject to internal pressure and axial force simultaneously. The considered typical pressure vessel domes are ellipsoidal and tori-spherical domes with skirt and nozzle part. These pressure vessel domes under loading have higher stress concentration on geometric discontinuity parts. Therefore, thickness optimization of axi-symmetric pressure vessel domes is essentially concerned on minimizing this stress concentration. The objective function is minimization of weight of pressure vessel dome. The design variable is thickness of dome and cylinder. Considered constraint is Von Mises equivalent stress. In the optimization procedure, ANSYS code is used. The equivalent and hoop stress of original shape domes are compared with those of optimal shape domes. And optimal thicknesses for pressure vessel domes are presented.