An abstract of the thesis of

Document Outline

• Pretext
  • AN ABSTRACT OF THE DESERTATION
  • Numerical Modeling and Experiments on Wood-Strand Composites
  • ACKNOWLEDGEMENTS
  • TABLE OF CONTENTS
  • LIST OF FIGURES
  • LIST OF TABLES
  • Dedication
  • Vita
• Chapter 1 - Introduction, Objective and backgound
  • 1.1. Introduction and Motivation
  • 1.2. Wood-Strand Composites
    • 1.2.1 Oriented Strand Board (OSB)
    • 1.2.2 Oriented Strand Lumber (OSL)
  • 1.3. Adhesive
    • 1.3.1 Phenol Formaldehyde (PF) Resin
    • 1.3.2 Polyvinyl Acetate (PVA, Tite Bond Original)
  • 1.4 Flow Chart of Tasks in this Research
  • 1.5 Technical Objectives of the Research
  • 1.6 Rationale and Significance
  • 1.7 Structure of the Dissertation
  • References
• Chapter 2 – Measuring the Effect of Adhesive Coverage on the Mechanical Stiffness of Glued Strands in Oriented Strand Board
  • Abstract
  • 2.1 Introduction
    • 2.1.1 Imperfect Interface
  • 2.2 Experimental
    • 2.2.1 Materials
    • 2.2.2 Methods and Procedures
    • 2.2.3 Calculation of Interfacial Properties
    • 2.2.4 Statistical Analysis of Experimental Data
  • 2.3 Results and Discussion
  • 2.4 Summary and Conclusions
  • Appendix 2.1: Processes for making double lap shear (DLS) specimen from wood strands.
  • Appendix 2.2: SEM bondline images of VTC and unmodified strands
  • References
• Chapter 3 – Numerical Simulation of Wood-Strands and Wood-Based Composites: Part 1. Effect of Glue-Line Interface and Strand Undulating on Mechanical Properties
  • Abstract
  • 3.1 Introduction
  • 3.2 Numerical Simulation by Material Point Method (MPM)
    • 3.2.1 Disadvantages of MPM
  • 3.3 Mechanical Properties of One Strand
    • 3.3.1 Compression Stress-Strain Law and Power Law
    • 3.3.2 Hill Plasticity Material (Model)
  • 3.4 Glue-Lines
    • 3.4.1 Interface of the Glue-Lines
  • 3.5. Simulation of OSB
    • 3.5.1 Model Composites
    • 3.5.2 Tension Method
    • 3.5.3 Verify the Model
  • 3.6 Results and Discussion
    • 3.6.1 Numerical Modeling of OSB
    • 3.6.2 Numerical Modeling of OSL
    • 3.6.3 Plywood – Numerical Modeling of OSB with No Gaps
    • 3.6.4 Numerical Modeling of OSB with Surface VTC Strands
    • 3.6.4.1 50% VTC by Volume
    • 3.6.4.2 20% and 40% of VTC by Weight
  • 3.7 Modeling
    • 3.7.1 Homogenized Model
  • 3.8 Summary and Conclusions
  • Appendix 3.1: Generalize interpolation material point method (GIMP) derivation
  • Appendix 3.2: Calculated mechanical property from elastic modulus
  • Appendix 3.3: Calculated mechanical property for random core
  • Appendix 3.4: Compaction Movies
  • References
• Chapter 4 – Effect of Elastic Properties in Bending of Wood-Strand Composites with Glue-Line Interface and Strands Undulating
  • Abstract
  • 4.1 Introduction
  • 4.2 MPM Simulations
    • 4.2.1. Validation of Model (Sensitivity Study)
  • 4.3 Results and Discussion
    • 4.3.1 Numerical Modeling of OSB in Bending Mode
    • 4.3.2 Plywood (OSB with No Gaps)
    • 4.3.3 Numerical Modeling of OSB with Surface Strands Loaded in Bending
  • 4.4 Laminate Beam Analysis for Bending (Symmetry Three Layers Composites Model)
  • 4.5 Summary and Conclusions
  • References
• Chapter 5 – Effect of strand length and gap spacing on Mechanical Properties of Wood Strands and Wood Based Composites
  • Abstract
  • 5.1 Introduction
  • 5.2 Literature Review
  • 5.3 Results and Discussion
  • 5.4 Shear Lag Model
  • 5.4 Summary and Conclusions
  • References
• Chapter 6 – Effect of density on mechanical properties of wood-strand composites
  • Abstract
  • 6.1 Introduction
  • 6.2 Method and Procedures
  • 6.3 Experimental Calculation of Density
  • 6.4 Simulations of Vertical Density Profile in 2D
    • 6.4.1 Commercial OSB
    • 6.4.2 VTC and Control Panels
    • 6.4.3 Effect of Compaction Rate
    • 6.4.4 Effect of Surface Layer Properties
  • 6.5 Simulations of Vertical Density Profile in 3D
    • 6.5.1 Commercial OSB
    • 6.5.2. Effects of Surface Strand Properties
  • 6.6 Homogenized Model Interpretation
    • 6.6.1 Model Derivation
    • 6.6.2 Model Interpretation
  • 6.7 Summary and Conclusions
  • Appendix
• Chapter 7 – Final Conclusions, Recommendations and Future Directions
  • 7.1 General Conclusions
  • 7.2 Tensile Properties
  • 7.3 Bending Properties
  • 7.4 VTC Tension and Bending
  • 7.5 Aspect Ratio
  • 7.6 Vertical Density Profile (VDP)
  • 7.7 Use of MPM
  • 7.8 Recommendations and Future Directions
  • References