NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsDevelopment and Application of a Tool for Optimizing Composite Matrix Viscoplastic Material ParametersThis document describes a recently developed analysis tool that enhances the resident capabilities of the Micromechanics Analysis Code with the Generalized Method of Cells (MAC/GMC) and its application. MAC/GMC is a composite material and laminate analysis software package developed at NASA Glenn Research Center. The primary focus of the current effort is to provide a graphical user interface (GUI) capability that helps users optimize highly nonlinear viscoplastic constitutive law parameters by fitting experimentally observed/measured stress-strain responses under various thermo-mechanical conditions for braided composites. The tool has been developed utilizing the MATrix LABoratory (MATLAB) (The Mathworks, Inc., Natick, MA) programming language. Illustrative examples shown are for a specific braided composite system wherein the matrix viscoplastic behavior is represented by a constitutive law described by seven parameters. The tool is general enough to fit any number of experimentally observed stress-strain responses of the material. The number of parameters to be optimized, as well as the importance given to each stress-strain response, are user choice. Three different optimization algorithms are included: (1) Optimization based on gradient method, (2) Genetic algorithm (GA) based optimization and (3) Particle Swarm Optimization (PSO). The user can mix and match the three algorithms. For example, one can start optimization with either 2 or 3 and then use the optimized solution to further fine tune with approach 1. The secondary focus of this paper is to demonstrate the application of this tool to optimize/calibrate parameters for a nonlinear viscoplastic matrix to predict stress-strain curves (for constituent and composite levels) at different rates, temperatures and/or loading conditions utilizing the Generalized Method of Cells. After preliminary validation of the tool through comparison with experimental results, a detailed virtual parametric study is presented wherein the combined effects of temperature and loading rate on the predicted response of a braided composite is investigated.Document ID20180001239Acquisition SourceGlenn Research CenterDocument TypeTechnical Memorandum (TM)AuthorsMurthy, Pappu L. N.*(NASA Glenn Research Center Cleveland, OH United States)*Naghipour Ghezeljeh, Paria*(Ohio Aerospace Inst. Cleveland, OH, United States)*Bednarcyk, Brett A.*(NASA Glenn Research Center Cleveland, OH United States)*Date AcquiredFebruary 15, 2018Publication DateJanuary 1, 2018Subject CategoryComposite MaterialsComputer Programming And SoftwareReport/Patent NumberGRC-E-DAA-TN50917NASA/TM-2018-219745E-19461Funding Number(s)WBS: WBS 826611.04.03.01CONTRACT_GRANT: NNC13BA10BDistribution LimitsPublicCopyrightPublic Use Permitted.Keywordsthermo-mechanical; MATLAB; GUI-Based TooAvailable DownloadsNameType20180001239.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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