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Buckling Strength Analysis of Stiffened Panels of Ship Structures Using Non-linear FEM

摘要第5-6页
ABSTRACT第6页
CHAPTER 1 INTRODUCTION第10-17页
    1.1 Stiffened Plate and Panels第10页
    1.2 Use of Stiffened Panels In Engineering Structures第10-12页
    1.3 Buckling And Ultimate Strength第12-13页
        1.3.1 Buckling第12页
        1.3.2 Buckling in Stiffened panels of Ships第12-13页
    1.4 Buckling Strength Analysis Techniques第13-14页
        1.4.1 Analytical Methods第14页
        1.4.2 Experimental Tests第14页
        1.4.3 Empirical Approaches第14页
        1.4.4 Nonlinear Finite Element Methods第14页
        1.4.5 Idealized Structural Unit Method (ISUM)第14页
    1.5 Historical Background第14-15页
    1.6 Objectives and Scope of Current Work第15-16页
    1.7 Organization Of The Thesis Report第16-17页
CHAPTER 2 STIFFENED PLATE AND PANEL ANALYSIS TECHNIQUES第17-24页
    2.1 Introduction第17页
    2.2 Buckling Analysis of Stiffened Panels第17-19页
        2.2.1 Plates And Stiffened Panels in offshore structures第17页
        2.2.2 Structural Buckling第17-19页
    2.3 Different Analysis Techniques第19-24页
        2.3.1 Analytical method第19-21页
        2.3.2 Rules laid down by classification societies第21页
        2.3.3 Finite element Analysis (FEA)第21-22页
        2.3.4 Types of Finite Element Analysis第22-23页
        2.3.5 Idealized Structural Unit Method (ISUM)第23-24页
CHAPTER 3 THEORETICAL BACKGROUND OF BUCKLING STRENGTH EVALUATION第24-43页
    3.1 Introduction第24页
    3.2 Description of the Chosen Panel第24-26页
        3.2.1 Geometrical properties第25-26页
        3.2.2 Material Properties第26页
        3.2.3 Loading conditions第26页
    3.3 Theoretical And Empirical Formulations For Buckling Strength Evaluation of plate panel第26-30页
        3.3.1 Plate Dimensions第27页
        3.3.2 Plate Loading conditions第27页
        3.3.3 Boundary Conditions第27-28页
        3.3.4 Elastic buckling of plate under single type of load第28页
        3.3.5 Elastic buckling of plate under two load components (Biaxial compression)第28-29页
        3.3.6 Lateral pressure loading in addition to biaxial compression第29-30页
        3.3.7 Elastic-plastic Buckling of plates第30页
    3.4 Plate panel Buckling strength Parameters第30-31页
    3.5 Theoretical And Empirical Formulations For Buckling Strength Evaluation of Stiffened Panel第31-33页
        3.5.1 Stiffened Panel Loading conditions第31页
        3.5.2 Boundary Conditions for panel第31页
        3.5.3 Elastic buckling of Panel under Longitudinal Axial compressive load第31页
        3.5.4 Elastic Local Buckling of Plate第31页
        3.5.5 Elastic Local Buckling of Stiffener Web第31-33页
        3.5.6 Elastic Local Buckling of Stiffener Flange第33页
    3.6 Buckling Analysis Using FEM Techniques第33页
    3.7 Buckling Analysis Using ANSYS第33-35页
        3.7.1 GUI Method第34页
        3.7.2 Using APDL第34-35页
    3.8 Linear Buckling Analysis第35-39页
        3.8.1 Procedure to perform the Linear Buckling analysis in ANSYS第35-39页
    3.9 Non-Linear Buckling Analysis第39-43页
        3.9.1 Procedure to perform the Non-Linear Buckling analysis in ANSYS第39-43页
CHAPTER 4 LINEAR AND NONLINEAR BUCKLING ANALYSIS & RESULTS第43-67页
    4.1 Introduction第43页
    4.2 Specifications of the Stiffened Panel and Plate Panel第43-44页
    4.3 Initial Imperfections第44-46页
    4.4 Linear (Eigenvalue) analysis of Plate Panel:第46-49页
        4.4.1 Pre-processing第46-48页
        4.4.2 Solution Phase第48页
        4.4.3 Post-Processing第48-49页
    4.5 Nonlinear analysis of Plate Panel第49页
    4.6 Generation of imperfections for nonlinear analysis第49-50页
    4.7 Running the Nonlinear Buckling Analysis第50-52页
    4.8 Buckling strength under longitudinal stress with lateral pressure第52-56页
        4.8.1 Buckling strength of plate panel under biaxial loading第53-56页
    4.9 Linear (Eigenvalue) analysis of stiffened Panel第56-64页
        4.9.1 Finite Element Model Details第57-64页
    4.10 Discussion on Results第64-67页
CHAPTER 5 DEVELOPMENT OF ISUM UNIT第67-86页
    5.1 The background第67页
        5.1.1 Types of Nonlinearities第67页
    5.2 Idealized structural unit method (ISUM)第67-68页
    5.3 Modelling strategies for steel plated structures using ISUM第68-69页
    5.4 Procedure for development of ISUM units第69-70页
    5.5 Development of the ISUM rectangular plate unit for analysis of ultimate strength第70页
    5.6 Theoretical background第70-71页
    5.7 Strain-displacement relationship第71-73页
    5.8 The Elastic tangent stiffness matrix [K]E第73页
    5.9 Total lagrangian approach第73-75页
    5.10 The Updated Lagrangian Approach第75-76页
    5.11 Formulation For the ISUM Unit第76-85页
        5.11.1 Shape Function第76-77页
        5.11.2 Derivation of strain-displacement matrix Bp and Bb第77-83页
        5.11.3 Solution of the Nonlinear set of equations:第83-85页
    5.12 Discussion on Improvement of Element第85-86页
CONCLUDING REMARKS AND FUTURE RECOMMENDATIONS第86-88页
    Concluding Remarks第86页
    Recommendations for Future Work第86-88页
REFERENCES第88-92页
ACKNOWLEDGEMENTS第92页

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