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    Wyświetlanie 1-5 z 5
    Tytuł:
    Design of Honeycomb Structures Produced by Investment Casting
    Autorzy:
    Naplocha, K.
    Dmitruk, A.
    Mayer, P.
    Kaczmar, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382969.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    investment casting
    3D printing
    honeycomb design
    light structure
    odlewnie
    drukowanie 3d
    projekt plaster miodu
    plaster miodu
    lekkie konstrukcje
    Opis:
    Investment casting combined with the additive manufacturing technology enables production of the thin-walled elements, that are geometrically complex, precise and can be easy commercialized. This paper presents design of aluminium alloy honeycombs, which are characterized with light structure, internal parallel oriented channels and suitable stiffness. Based on 3D printed pattern the mould was prepared from standard ceramic material subjected subsequently to appropriate heat treatment. Into created mould cavity with intricate and susceptible structure molten AC 44200 aluminium alloy was poured under low pressure. Properly designed gating system and selected process parameters enabled to limit the shrinkage voids, porosities and misruns. Compression examination performed in two directions showed different mechanisms of cell deformation. Characteristic plateau region of stress-strain curves allowed to determine absorbed energy per unit volume, which was 485 or 402 J/mm3 depending on load direction. Elaborated technology will be applied for the production of honeycomb based elements designated for energy absorption capability.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 76-80
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dissipation of Energy in Sandwich-Structured Equestrian Helmet – Numerical Analysis Under Overload Conditions
    Autorzy:
    Bińczak, Natalia
    Kuryło, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1830790.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    head injuries
    equestrian helmet
    honeycomb
    urazy głowy
    kask jeździecki
    plaster miodu
    Opis:
    Protection of the head structures is a requirement in many sports where a person is exposed to injuries that threaten life or health. In horse riding accidents occur often, resulting in serious head injuries. The analysis of the available literature shows that the helmets used now protect human head structures in a small percentage. The aim of the research was to analyze the degree of protection of the human head using available helmet structure and a new solution for the Energy absorbing layer in helmet that absorbs Energy from impacts. The research was divided into two stages. During the first one, a simulation was performer under dynamic conditions simulating the rider’s fall and the contact of the head with ground (impact from the side). In the second stage, three structures of the absorbing layers were developed, i.e. honeycomb, auxetic, mixed with three three wall thicknesses (1 mm, 2 mm and 3 mm respectively) and two materials were used: the currently used EPS and the aluminium alloy used in the motorcycle helmet.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2021, 3, 1; 11-18
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element model updating of reinforced concrete beams with honeycomb damage
    Autorzy:
    Ismail, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/230829.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parametr uszkodzenia
    model elementów skończonych
    plaster miodu
    uaktualnienie
    moduł Younga
    damage parameter
    finite element model
    honeycombing
    updating
    Young's modulus
    Opis:
    A method of detecting honeycombing damage in a reinforced concrete beam using the finite element model updating technique was proposed. A control beam and two finite element models representing different severity of damage were constructed using available software and the defect parameters were updated. Analyses were performed on the finite element models to approximate the modal parameters. A datum and a control finite element model to match the datum test beams with honeycombs were prepared. Results from the finite element model were corrected by updating the Young’s modulus and the damage parameters. There was a loss of stiffness of 3% for one case, and a loss of 7% for another. The more severe the damage, the higher the loss of stiffness. There was no significant loss of stiffness by doubling the volume of the honeycombs.
    Źródło:
    Archives of Civil Engineering; 2012, 58, 2; 135-151
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Out-of-plane static crushing of thin-walled honeycomb structures. Numerical and experimental investigation
    Autorzy:
    Ciepielewski, Radosław
    Dybcio, Paweł
    Barnat, Wiesław
    Powiązania:
    https://bibliotekanauki.pl/articles/102078.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    honeycomb
    thin-walled structure
    static compression test
    out-of-plane compression
    FEM
    LS-DYNA
    Alucore
    plaster miodu o cienkich ściankach
    test kompresji statycznej
    kompresja pozasłoneczna
    MES
    Opis:
    Aim of presented study was to compare plateau stress in honeycomb structures under out-of-plane load calculated using Wierzbicki formula with numerical simulations validated using experimental trials. ALUBOND® Alucore honeycomb structure was examined. The results of theoretical, experimental and numerical investigation are reported. Two methods of modeling core behavior were evaluated using simulations. Full core geometry and simplified Y-shaped element were analyzed. Both approaches were compared with experimental out-of-plane compression tests. Aim of the study was to determine the influence of core geometrical parameters on obtained plateau stress value. Various foil thicknesses and cell sizes were studied numerically. The results showed, that initial and final deformation mode strongly depends on the geometry of the honeycomb structure. Force required to crush the core grew with increase of wall thickness, and decreased with increase of cell size. Calculations were performed using an implicit integration scheme implemented in the LS-DYNA software. Research showed the presence of plateau relationship between stress and geometric dimensions and structure response. Good agreement between results obtained by all methods was achieved. Basing on the results, conclusions concerning modeling honeycomb materials were drawn.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 3; 96-105
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automated Design of Honeycomb Conformal Cooling Channels for Improving Injection Molding Quality
    Autorzy:
    Luh, Yuan-Ping
    Chin, Chien-Chuan
    Iao, Hong-Wai
    Powiązania:
    https://bibliotekanauki.pl/articles/26081481.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    konformalny kanał chłodzący
    konstrukcja automatyczna
    jedna forma - wiele wnęk
    system zimnego kanału
    plaster miodu
    conformal cooling channel
    automatic constructed
    one-mold-multiple-cavities
    cold runner system
    honeycomb
    Opis:
    The study of conformal cooling channel usually has adopted two assumptions in model design: the use of (1) a hot runner system and (2) a one-mold-one-cavity design. These assumptions substantially simplify the research. However, most molds are designed using a cold runner system and multiple cavities. These two assumptions may not apply to all commercial systems; hence, a design method for honeycomb CCCs for cold runner systems and multiple cavities is proposed in this study. Specifically, an algorithm was developed to automatically design CCCs for such systems. This algorithm can be used to reduce the cooling time, improve product quality, and ensure that the system temperature is relatively homogenous in practical situations. According to the result of this study, the honeycomb CCC models were more effective at maintaining a homogeneous temperature distribution, reducing shrinkage, and reducing warpage for both parts produced from the same two-cavity mold, thus ensuring consistent part quality.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 44--57
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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