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    Wyświetlanie 1-4 z 4
    Tytuł:
    Analytical discrete stacking sequence optimization of rectangular composite plates subjected to buckling and FPF constraints
    Autorzy:
    Muc, A.
    Chwał, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/280919.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    stacking sequence optimization
    composite plates
    buckling
    first-ply-failure
    Opis:
    A special type of new discrete design variables is introduced in order to find optimal stacking sequences for laminated structures. Using the proposed new design variables, we demonstrate how to find analytical (i.e. without any numerical optimization algorithm) optimal solutions for laminates made of plies having three different fibre orientations: 0° , ±45° , 90° . It is proved that the definition of design variables enables us to distinguish two types of optimal solutions, i.e. unimodal and bimodal ones. The form of optimal stacking sequences affects the multiplicity (bimodal problems) or uniqueness (unimodal problems) of the solutions. The decoding procedure between membrane and flexural design variables is also proposed. The results demonstrate the effectiveness, simplicity and advantages of the use of design variables, especially in the sense of the accuracy, repeatability of results and convergence of the method.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 423-436
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of buckling response of the deck panel in axial compression
    Autorzy:
    Ozguc, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/258946.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    buckling failure
    non-linear finite element analysis
    deck panel
    initial imperfection
    collapse mechanism
    Opis:
    In this work, buckling strength assessment of a deck of a double hull oil tanker is carried out using the non-linear finite element code ADVANCE ABAQUS. The comparisons are performed with the Det Norske Veritas (DNV-GL) PULS (Panel Ultimate Limit State) buckling code for the stiffened panels, DNV-GL Classification Notes (CN) No.30.1 and the DNV-GL Ship Rules. The case studied corresponds to axial compression. Two levels of imperfection tolerances are analyzed, in accordance with the specifications in the DNV-GL Instruction to Surveyors (IS) and the DNV-GL Classification Notes No. 30.1. Both “as built” and DNV–GL Rule “net” dimensions are analyzed. The strength values from ADVANCE ABAQUS and PULS are very close. DNV-GL CN 30.1 is in conservative side, but the strength differences between the “as built” and “net” dimension cases are consistent with the finite element analysis results. This paper gives a brief description of the background for the stiffened panel models used in PULS, and comparison against non-linear FE analysis, and DNV-GL Classification Society Rules. The finite element code ADVANCE ABAQUS is employed in a non-linear buckling analysis of a stiffened deck panel on a double skin tanker that is subjected to a Condition Assessment Program (CAP) hull survey. The aim of the analyses has been to validate and compare the buckling capacity estimates obtained from PULS, DNV-GL Classification Notes No.30.1 (CN 30.1) and the DNV-GL Ship Rules.
    Źródło:
    Polish Maritime Research; 2018, 4; 98-105
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silo failures: Why do they happen?
    Autorzy:
    Carson, J. W.
    Holmes, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955783.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    silo
    structural failure
    buckling
    silo design
    silo construction
    silo operation
    silo maimtenance
    Opis:
    Silos and bins fail with a frequency that is much higher than that of almost any other industrial equipment. Sometimes the failure involves only distortion or deformation that, while unsightly, does not pose a safety or occupational hazard. In other cases, failure involves complete collapse of the structure with accompanying loss of use and even loss of life. Three major causes of silo failure are identified: design errors, construction errors, and utilization errors. Numerous case histories are used to illustrate common mistakes, limits of design, and lessons learned.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 499-512
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability and failure of thin-walled composite structures with a square cross-section
    Autorzy:
    Czajka, Błażej
    Różyło, Patryk
    Dębski, Hubert
    Powiązania:
    https://bibliotekanauki.pl/articles/2097437.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    finite element method
    FEM
    post-buckling
    progressive failure analysis
    PFA
    delamination
    cohesive zone model
    CZM
    Opis:
    This paper is devoted to the analysis of the stability and load-carrying capacity of thin-walled composite profiles in compression. The specimens reflect elements made of carbon fibre reinforced laminate (CFRP). Thin-walled columns with a square cross-section were made from 4 layers of composite in 3 different combinations of layer arrangements. Advanced numerical analyses have been carried out. In the first stage of the study, a buckling analysis of the structure was performed. In further numerical simulations, two advanced models were used simultaneously: the Progressive Failure Analysis (PFA) and the Cohesive Zone Model (CZM). The results showed significant differences between the critical load values for each layer configuration. The forms of buckling and the areas of damage initiation and evolution were also dependent on the applied layup.
    Źródło:
    Applied Computer Science; 2022, 18, 2; 43--55
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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