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    Predictive Micro- and Meso-Mechanics Damage Models for Continuous Fiber-Reinforced Thermoplastic Composites

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    DithoPulungan_PhD_Dissertation_2019.pdf
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    Description:
    thesis - Ditho
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    Type
    Dissertation
    Authors
    Pulungan, Ditho Ardiansyah cc
    Advisors
    Lubineau, Gilles cc
    Committee members
    Moran, Brian cc
    Santamarina, Carlos cc
    Gonzalez, Carlos
    Yaldiz, Recep
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2019-11
    Embargo End Date
    2020-12-01
    Permanent link to this record
    http://hdl.handle.net/10754/660428
    
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    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation will become available to the public after the expiration of the embargo on 2020-12-01.
    Abstract
    Environmental issues enforce transportation sectors to limit their carbon dioxide emissions in various ways. Automotive manufacturers attempt to reduce carbon dioxide emission by seeking various strategies, e.g., increasing aerodynamic efficiency, using more fuel-efficient engines, reducing friction and wear of transmission systems, and, most importantly, by using lightweight materials and structures. This dissertation is a contribution toward a lightweight design of structures by proposing numerical models suitable for damage prediction of thermoplastic composite materials. In this dissertation, predictive damage models for two different length scales, namely micromechanics, and mesomechanics, were proposed. Micromechanics is used to predict the nonlinear damage behavior of elementary thermoplastic composite ply, while the mesomechanics is used to predict the failure behavior of thermoplastic composite laminates (test coupon or plate scale). For the micromechanics, a representative volume element (RVE) of such materials was rigorously determined using a geometrical two-point probability function and the eigenvalue stabilization of homogenized elastic tensor obtained by Hill-Mandel kinematic homogenization. We proposed a viscoelastic viscoplastic model for the polypropylene matrix to extend the capability of the micromechanics model in predicting the damage behavior of the composite ply at higher rates. At the mesoscale, we improved the classical mesomechanics damage modeling in the off-axis direction by introducing the confinement effect. The pragmatic approach consists of separating the progressive damage into two parts, namely “diffuse damage regime” and “transverse-cracking regime”, were described by two distinct damage parameters. We also enriched the mesomechanics model by proposing a viscoelastic and viscoplastic model to account for the rate-dependent behavior of the thermoplastic composites. We showed that the predictions given by the proposed micromechanics and mesomechanics models were in excellent agreement with the experimental results in terms of the global stress-strain curves, including the linear and nonlinear portion of the response and also the failure point, making it useful virtual testing tools for the design of thermoplastic composites.
    Citation
    Pulungan, D. A. (2019). Predictive Micro- and Meso-Mechanics Damage Models for Continuous Fiber-Reinforced Thermoplastic Composites. KAUST Research Repository. https://doi.org/10.25781/KAUST-DJ9Q9
    DOI
    10.25781/KAUST-DJ9Q9
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-DJ9Q9
    Scopus Count
    Collections
    Dissertations; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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