• Title, Summary, Keyword: Crush Analysis

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Crush Strength Analysis of a Spacer Grid for PWR Nuclear Fuel Considering Mechanical Properties in Weld Zone (용접부 기계적 물성치를 고려한 경수로 핵연료 지지격자의 충격해석)

  • Song, Kee-Nam;Lee, Sang-Hoon
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.8 no.2
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    • pp.7-13
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    • 2012
  • A spacer grid which is one of the most important structural components in a pressurized water reactor fuel is an interconnected array of slotted grid straps, welded at the intersections to form an egg-crate structure. The spacer grid is required to not only protect fuel rods stably but also have sufficient lateral crush strength for the sake of enabling shut-down of the nuclear reactor during abnormal operating environments. Then, the lateral crush strength of the spacer grid is closely related with welding quality of the spacer grid. Previous research on the crush strength analysis of the spacer grid had been performed using only parent material properties. In this study, to investigate the effect on the crush strength of the spacer grid when used mechanical properties in weld zone instead of parent material properties, crush strength analysis considering mechanical properties in weld zone obtained from the instrumented indentation technique was performed and compared the results with the previous research.

Study of Crush Strength of Aluminum Honeycomb for Shock Absorber of Lunar Lander (달착륙선 충격흡수장치용 알루미늄 허니콤의 Crush Strength에 관한 연구)

  • Kim, Shin;Lee, Hyuk-Hee;Kim, Hyun-Duk;Park, Jung-Sun;Im, Jae-Hyuk;Hwang, Do-Soon
    • Journal of Aerospace System Engineering
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    • v.4 no.3
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    • pp.1-5
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    • 2010
  • Understanding the crushing behaviour of aluminum honeycombs under dynamic loading is useful for crash simulations of vehicles and for design of impacting energy absorbers. In the study of honeycomb crushing under quasi-static, dynamic loading, the most important parameter is crush strength. Crush strength is indicated to energy absorption characteristic of aluminum honeycomb. In this study, Using Finite Element Analysis carried out crush strength of hexagonal aluminum honeycomb then the results was compared with Quasi-static test. Consequently, Crush strength is different in quasi-static loading and dynamic loading about 16%.

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Dynamic Crush Strength Analysis of a Spacer Grid Assembly for a LWR Nuclear Fuel Assembly(II) (경수로 핵연료 지지격자의 동적 좌굴강도 해석(II))

  • Song, Kee-Nam;Lee, S.B.
    • Proceedings of the KSME Conference
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    • pp.590-592
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    • 2008
  • A spacer grid is one of the most important structural components in a LWR nuclear fuel assembly. The primary considerations are to provide a Zircaloy spacer grid with crush strength sufficient to resist design basis loads, without significantly increasing pressure drop across the reactor core. In this study, the dynamic crush strength analysis and test are carried out for the specimens of a spacer grid assembly.

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CRUSH BEHAVIOR OF METALLIC FOAMS FOR PASSENGER CAR DESIGN

  • Cheon, S.S.;Meguid, S.A.
    • International Journal of Automotive Technology
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    • v.5 no.1
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    • pp.47-53
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    • 2004
  • In this paper, a modified and representative unit cell model was employed to study the crush behaviour of a closed cell metallic foam. The unit cell which captures the main geometrical features of the metallic foam considered was used to simulate crush behaviour in metallic foams. Both analytical using limit analysis and numerical using the finite element method were used to study the collapse behaviour of the cell. The analytical crushing stress of the foam was compared with FE results and was found to be in good agreement.

Energy Absorption of Collision Post Based on North American CFR Regulations for Railway Vehicles (철도차량의 북미 CFR 법규에 대한 충돌 기둥에너지 흡수에 관한 연구)

  • Kim, Seung-Tech;Jeong, Ji-Ho;Choi, Jeong-Yong;Woo, Kwan-Je
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.8
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    • pp.935-943
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    • 2012
  • In accidents involving the collision of railway vehicles, there is a risk that structural members might penetrate the cab frame of the railway vehicle in the space in which the driver or passengers are seated. To reduce this risk, worldwide, studies on the collision of railway vehicles are underway. In North America, the Code of Federal Regulations (CFR) was revised in 2010 to include crush criteria for a collision and the corner post in an end frame. In this study, a crush analysis and crush test for a collision post and a crash analysis for a rigid cylinder were performed according to the CFR. The analysis and test results were compared and reviewed. This study aims to determine the usefulness of crush analysis for developing various end frames, and to understand the crush and crash characteristics and review the accuracy of the analysis.

Crush Analysis of Tilting Train Express M-Car Initial Design (한국형 고속틸팅차량 구동차 설계초안의 충돌압괴특성 분석)

  • Jung Hyun-Seung;Koo Jeong-Seo;Kwon Tae-soo
    • Proceedings of the KSR Conference
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    • pp.738-743
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    • 2004
  • In this paper, the crush characteristic of the tilting train express M-car was estimated under a head-on collision scenario. The car body was divided into three parts - front, middle, and rear. For each part, crush-force relation was evaluated numerically using LS-DYNA 3-diementional shell element analysis. This result will be used for one-dimensional collision analysis of the full train rake.

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Experimental Study on Side Impact Characteristics for Automotives Door Module (자동차용 도어 모듈의 측면 충돌특성에 관한 실험적 연구)

  • Jeon, S.J.;Kim, M.H.;Lee, G.B.;Lee, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.318-318
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    • 2009
  • The door stiffness is one of the important factors side impact. Generally, the researches have been conducted on the assembled door module. This study is to analysis the side impact characteristics for automotives door module. The impact characteristics have been determined by door module side impact test machine. To determine the initial, intermediate and peak crush resistances use the plot of load versus displacement and obtain the integral of the applied load with respect to the crush distances specified below for each door tested. The initial crush resistance is the average force required to deform the door through the initial 6 inches of crush. The intermediate crush resistance is the average force required to deform the door through the initial 12 inches of crush. The peak crush resistance will be directly obtained from the plot of load versus displacement since it is the largest force required to deform the door through the entire 18 inches crush distance. The data are used to determine if a specific vehicle or item of automotives equipment meets the minimum performance requirements of the subject Federal Motor Vehicle Safety Standard(FMVSS). FMVSS Static 214, Side impact protection, specifies performance requirements for protection of occupants in side impact crashes.

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Roof Crush Analysis Technique Using Simple Model with Plastic Hinge Concepts (소성 힌지를 갖는 단순 보 모델을 이용한 루프 붕괴 해석 기술)

  • 강성종
    • Transactions of the Korean Society of Automotive Engineers
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    • v.4 no.6
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    • pp.216-222
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    • 1996
  • This paper presents a computational technique to predict roof crush resistance in early design stage of passenger car development. This technique use a simple F.E. model with nonlinear spring elements which represent plastic hinge behavior at weak areas. By assuming actual sections as equivalent simple sections, maximum bending moments which weak areas in major members can stand are theoretically calculated. Results from prediction of roof crush resistance are correlated well with test results.

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The energy absorption behavior of square tube by F.E.M (유한요소법에 의한 사각형 튜브의 충돌에너지 흡수거동 II)

  • 강대민;윤명균;황종관
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.181-188
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    • 2000
  • This paper describes the energy absorption of a square tube under axi compression by using the finite element method. The overall deformations and lo buckling modes of tube was discussed by "plastic hinge concep Force-displacement function was plotted to show various state that depended or time. Also, mean crush load was expressed as a type of section geometry a material property using dimensional analysis. To verify the energy absorption and the effects of dimensions, The standards Wt used as related density and specific energy, mean crushing load and the resL were discussed by the relation between crush load and deformation, the relati between related density and specific energy, the relation between crush load a mean crush load, the relation between mean crush load and specific energy.ergy.

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The Dynamic Mean Crush Load of Thin-walled Square Tubes (박판 정4각튜브의 동적 평균압괴하중)

  • 김천욱;한병기;원종진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.5
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    • pp.119-127
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    • 1998
  • Assuming that the static loaded square tube and the dynamic loaded one have no difference in their characteristics of the crush distance, the theoretical mean dynamic crush load was calculated with respect to the impact speed considering the strain rate sensitivity of the material. The ratio of dynamic to static mean crush load was predicted with previous results. The theoretical analysis was compared with the experimental results of aluminum square tubes axially loaded dynamically.

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