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Development 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 ID
20180001239
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Murthy, 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 Acquired
February 15, 2018
Publication Date
January 1, 2018
Subject Category
Composite Materials
Computer Programming And Software
Report/Patent Number
GRC-E-DAA-TN50917
NASA/TM-2018-219745
E-19461
Funding Number(s)
WBS: WBS 826611.04.03.01
CONTRACT_GRANT: NNC13BA10B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
thermo-mechanical; MATLAB; GUI-Based Too
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