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Doudican Dissertation 20130715.pdf (11.81 MB)

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Modeling Repair of Fiber Reinforced Polymer Composites Employing a Stress-Based Constitutive Theory and Strain Energy-Based Progressive Damage and Failure Theory

Doudican, Bradley M
http://rave.ohiolink.edu/etdc/view?acc_num=osu1373926827

Abstract Details

2013, Doctor of Philosophy, Ohio State University, Civil Engineering.
Material system selection for primary structures requires a decision matrix that evaluates not only the initial design but also the full lifecycle economy. The ability to economically repair structural components over time may control initial design decisions, especially for structures tat are routinely repaired such as aircraft components. Composite materials in their virgin condition often provide substantial mechanical and environmental advantages over metals. However, the repair of composite materials has historically been more costly, time-consuming, and mechanically conservative than metallic repair, and thus is a barrier in the continued advancement of their use. The state of the art of composite repair analysis and substantiation in practice is often limited to simplified and conservative methodologies. While these methods of analysis may be acceptable for secondary or tertiary composite structures, the advancement in analysis of repair for primary composite structures must advance in order for composite materials to become a material system of choice. The state of the art of composite repair analysis and substantiation in published theory has advanced to include displacement-based, nonlinear, and fully three-dimensional finite element models; however, these current models also include geometric, loading, and material model simplifications and limitations that inhibit their general application. Given these limitations, the effective and optimal use of composite materials for primary structures over their complete lifecycle, fully developing the capabilities of their advantages over other material systems, is limited. The research herein documents the development of a composite repair model to advance the state of the art by addressing some of the limitations found in the current literature. A constitutive formulation based on a stress-based laminated plate theory was implemented through a finite element numerical solution algorithm to model the stress and displacement behavior of the composite laminate and coupled with a strain energy based progressive damage and failure theory. Further, the progressive damage and failure theory is deployed through a user subroutine for the Abaqus commercial finite element package for the analysis of progressive damage and failure of unidirectional fiber or woven fabric lamina. The model more accurately predict composite laminate constitutive response for both elastic and progressive damage modes, including the free edge effects and more complicated stress fields through a repair zone. A demonstration of the model’s predictive capabilities is provided by comparison to closed- and open-form analytical solutions, other numerical studies, and experimental data for lap joints and scarf repaired specimens. The findings from this research can be employed to both substantiate composite repair analyses and to predict the ultimate response of repaired components. Tangential benefits will include the development of improved constitutive modeling and progressive damage and failure modeling capabilities that will permit their deployment through powerful proprietary software platforms such as Abaqus, and the demonstration of the strengths and weaknesses of the composite modeling methods incorporated in current proprietary software codes.
William Wolfe (Advisor)
Tarunjit Butalia (Advisor)
Ethan Kubatko (Committee Member)
Gregory Schoeppner (Committee Member)
Dean Foster (Committee Member)
514 p.
Aerospace Engineering; Civil Engineering; Mechanical Engineering; Mechanics
Composite repair, stress based plate theory, progressive damage and failure, scarf repair, finite element analysis of composite materials

Recommended Citations

Citations

  • Doudican, B. M. (2013). Modeling Repair of Fiber Reinforced Polymer Composites Employing a Stress-Based Constitutive Theory and Strain Energy-Based Progressive Damage and Failure Theory [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1373926827

    APA Style (7th edition)

  • Doudican, Bradley. Modeling Repair of Fiber Reinforced Polymer Composites Employing a Stress-Based Constitutive Theory and Strain Energy-Based Progressive Damage and Failure Theory. 2013. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1373926827.

    MLA Style (8th edition)

  • Doudican, Bradley. "Modeling Repair of Fiber Reinforced Polymer Composites Employing a Stress-Based Constitutive Theory and Strain Energy-Based Progressive Damage and Failure Theory." Doctoral dissertation, Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1373926827

    Chicago Manual of Style (17th edition)

osu1373926827
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© 2013, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.