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Physics Based Multiscale Composite Analysis in Abaqus-Cae

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Physics Based Multiscale Composite Analysis in Abaqus-Cae

 

One of the challenges with the design and analysis of composite materials is the difficulty in identifying, isolating, and modeling the interrelated mechanisms contributing to material nonlinearity and failure. Mechanisms like fiber-matrix debonding and defect-induced stress concentrations can greatly affect the behavior of a composite part, but are often ignored or blurred during analysis. As a result of this blurring, engineers have an incomplete picture of their part’s behavior which often leads to overdesign and/or unexpected behavior in service. The goal of this study was to investigate a composite laminate structure made of unidirectional composite materials. Specifically the study focused on how characteristics at the material microstructure level (like matrix viscoelastic strength) change the overall response of a structure. A novel finite-element-based multiscale analysis framework, developed by MultiMechanics, was used to analyze the behavior inducing variables at multiple spatial scales within a laminate part.  Emphasis was placed on using ex-situ constituent properties to define the composite system and the corresponding structural response. This differs from most composite analysis tools which require extensive destructive testing of composite coupons in order to define the requisite material cards. The approach described in this paper required only the identification of mechanical properties for the bulk constituents (e.g. Fiber properties, Matrix properties). Further, only properties that could be obtained from simple physical tests was used and no reverse engineering was employed. This is important because destructive testing of composite specimens is often a prohibitively expensive step for composite-part designers, leading to overdesign or a lack of adoption. The results of both the microstructural analysis and analysis of a laminate part correlated well with experimental data. These results are promising in that they indicate that accurate micromechanical modeling at the constituent scale is a feasible method for performing physics-based composite analysis.  Future studies will investigate different composite types (woven, chopped fiber, etc.) and different loading scenarios to determine if the methodology from this study translates.

 

Authors: Andy MacKrell, Flavio Souza, Leandro Castro

 

Conference: CAMX 2016 – Anaheim

 

SKU/Code: TP16-0120

 

Pages: 16

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