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      Local Finite Element Refinement for Accurate Dynamic Stress via Modal Information Only

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          Abstract

          Accurate stress responses are the basics for failure analysis of aerospace structures, but they still can be challenging in numerical simulations for dynamic systems. This work exploits the stress mode shapes (SMSs) in local finite element (FE) refinement for the purpose of accurate dynamic stress estimation. Toward structural FE modeling, identification of critical locations via predominant SMSs is theoretically demonstrated. To pursue more accurate dynamic stress, a strategy for local FE refinement is proposed by using the information from stress modal analysis. The strategy involves a two-step procedure. First, modal participation factors (MPFs) are used to extract the predominant modes. Second, retained SMSs are evaluated for the local remeshing. Numerical simulations of a representative thin plate with geometric details were conducted. The SMSs were investigated in detail. Together with MPFs, SMSs can help to localize the dangerous stresses and then refine the local meshes to accurately calculate stress responses. By taking full advantage of numerically obtained SMSs, local structural FE modeling can be applied in a straightforward way with high efficiency. Results indicate that SMSs can reveal the underlying mechanism that governs the overall dynamic stress response.

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                Author and article information

                Journal
                aiaaj
                AIAA Journal
                AIAA Journal
                American Institute of Aeronautics and Astronautics
                1533-385X
                08 June 2020
                August 2020
                : 58
                : 8
                : 3593-3606
                Affiliations
                Nanjing University of Aeronautics and Astronautics , 211100 Nanjing, People’s Republic of China
                Author notes
                [*]

                Assistant Professor, College of Civil Aviation; 29 Jiangjun Ave.; yzhou@ 123456nuaa.edu.cn .

                Article
                J058947 J058947
                10.2514/1.J058947
                d0805239-6d19-45d1-90d8-754bbc5bfe66
                Copyright © 2020 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-385X to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.
                History
                : 10 August 2019
                : 11 March 2020
                : 26 March 2020
                Page count
                Figures: 15, Tables: 2
                Categories
                Regular Articles
                p2270, Materials and Structural Mechanics
                p2235, Structures, Design and Test
                p2263, Fluid Dynamics
                p2187, Computing, Information, and Communication
                p2291, Thermophysics and Heat Transfer
                p6062, Signal Processing
                p2057, Finite Element Method
                p3361, Failure Analysis
                p3264, Mechanical Properties
                p6343, Dynamic Analysis
                p3282, Computational Fluid Dynamics
                p1980, Structural Dynamics and Characterization
                p3304, Numerical Analysis
                p6220, Fatigue (Materials)
                p2668, Stress-Strain Analysis

                Engineering,Physics,Mechanical engineering,Space Physics
                frequency domain,dynamic displacement,numerical simulations,vibration fatigue,frequency response function,Poisson's ratio,stiffness matrix,vibration-fatigue,stress distributions,modal analysis,stress distribution,computational structural dynamics,Mechanical properties,structural damage,Numerical simulations,structural dynamics,stress concentrations,elastic modulus,stress concentration,Rayleigh-Ritz method,failure analysis,power spectral density,numerical model,damping matrix,Young's modulus,frequency-domain,numerical models,PSD

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