Now showing items 1-20 of 20

    • Automated fiber placement (AFP)--Effects of features and defects 

      Seneviratne, Waruna P.; Tomblin, John S.; Shafie, Mohamed Z.; Perera, Shenal; Smith, Garret (DEStech Publications, 2019-09)
      Automated Fiber Placement (AFP) manufacturing methods, considered to be one of the most advanced methods of composite manufacturing, are used in fabricating complex and large scale composite structures. During AFP ...
    • Automated fiber placement (AFP)—Effects of features and defects 

      Seneviratne, Waruna P.; Tomblin, John S.; Shafie, Mohamed Z.; Perera, Shenal; Smith, Garret (DEStech Publications, 2019)
      Automated Fiber Placement (AFP) manufacturing methods, considered to be one of the most advanced methods of composite manufacturing, are used in fabricating complex and large scale composite structures. During AFP ...
    • Automating structural modeling of composites enriched by X-ray micro-tomography and digital imaging data 

      Iliopoulos, Athanasios P.; Michopoulos, John G.; Steuben, John C.; Birnbaum, Andrew J.; Lua, Jim Y.; Karuppiah, Anand Vijay; Seneviratne, Waruna P.; Saathoff, Caleb (ASME, 2018)
      The manufacturing processes of Fiber Reinforced Polymers (FRPs) as composite materials are frequently prone to the creation of various types of undesired morphologies and defects. These can include layer waviness, inclusions, ...
    • A case for Tsai's Modulus, an invariant-based approach to stiffness 

      Ateiro, Albertino; Sharma, Naresh; Melo, Jose Daniel Diniz; Seneviratne, Waruna P. (Elsevier, 2020-11-15)
      For the past six years, we have been benefiting from the discovery by Tsai and Melo (2014) that the trace of the plane stress stiffness matrix (tr(Q)) of an orthotropic composite is a fundamental and powerful scaling ...
    • Composite drilling characterization and performance evaluation 

      Xiao, Jian; Pham, Dinh Chi; Lua, Jim Y.; Saathoff, Caleb; Seneviratne, Waruna P. (DEStech Publications, 2019-09)
      Hole drilling is one of the most widely used operations in order to place bolts or rivets. Drilling holes in composites leads to drilling-induced defects and damages such as delamination, burr, microcracking, swelling, ...
    • Compressive response of composite laminates with defects 

      Cui, Xiaodong; Karuppiah, Anand Vijay; Pham, Dinh Chi; Lua, Jim Y.; Saathoff, Caleb; Seneviratne, Waruna P. (American Institute of Aeronautics and Astronautics Inc, 2020-01-05)
      Defects are inevitable in the manufacture and service of composite laminates and their influence on the mechanical performance of composite laminates can be substantial. Ply waviness and delamination are two major types ...
    • Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen 

      Saseendran, Vishnu; Carlsson, Leif A.; Berggreen, Christian; Seneviratne, Waruna P. (KeAi Publishing Communications Ltd, 2020-12)
      Crack root rotation is a measure of deviation from clamped boundary conditions of region in front of the crack tip. The root rotation depends on the shear force and bending moment acting at the crack tip. Such rotation ...
    • Damage growth analysis of sandwich structures subjected to combined compression and pressure loading 

      Seneviratne, Waruna P.; Tomblin, John S.; Perera, Shenal; Varatharaj, Pirashandan (DEStech Publications, 2019-09)
      Fluid-ingression phenomena in composite sandwich structures is a concern for components employed in the aerospace industry. Poor design/material selections, impact damages, thermo-mechanical loads occurring during ...
    • Damage initiation and fracture analysis of honeycomb core single cantilever beam sandwich specimens 

      Saseendran, Vishnu; Varatharaj, Pirashandan; Perera, Shenal; Seneviratne, Waruna P. (SAGE, 2020-04-27)
      Fracture testing and analysis of aerospace grade honeycomb core sandwich constructions using a single cantilever beam test methodology is presented here. Influence of various parameters such as facesheet thickness, core ...
    • Damage mechanisms in tapered composite structures under static and fatigue loading 

      Rao, Prabhakar M.; Gurvich, Mark R.; Palliyaguru, Upul R.; Seneviratne, Waruna P. (DEStech Publications, 2019-09)
      In this work an integrated computational/experimental approach was developed to validate the predictive capabilities of State-of-the-Art (SoA) Progressive Damage Analysis (PDA) methods and tools. Specifically, a tapered ...
    • Defects characterization and evaluation of their effects on compressive failure of composite components 

      Cui, Xiaodong; Pham, Dinh Chi; Karuppiah, Anand Vijay; Lua, Jim Y.; Saathoff, Caleb; Seneviratne, Waruna P. (DEStech Publications, 2019-09)
      In the design and certification of composite structural components for aircrafts, compression and combined compression and shear loading cases have to be considered. Various forms of defects such as ply waviness, delamination ...
    • Defects characterization, damage mapping, and property evaluation of composites 

      Lua, Jim Y.; Sadeghirad, Alireza; Cui, Xiaodong; Karuppiah, Anand Vijay; Saathoff, Caleb; Seneviratne, Waruna P. (DEStech Publications Inc., 2018)
      The presence of voids in the composite laminates can reduce the mechanical properties in composites and these voids can become precursors in the activation of other failure modes such as delamination. Knowing the volume ...
    • An engineering approach to analyze damage initiation modes in tapered composite structures 

      Rao, Prabhakar M.; Palliyaguru, Upul R.; Gurvish, Mark R.; Seneviratne, Waruna P. (DEStech Publications Inc., 2018)
      In this work an engineering approach is demonstrated for analyzing damage initiation modes in tapered composite structures. The analysis methodology includes simulation of the non-linear static response of tapered composite ...
    • Injection repair for restoration of composite properties 

      Seneviratne, Waruna P.; Saathoff, Brandon L.; Palliyaguru, Upul R.; Hayes, B.S.; Dixon, D.G. (SAMPE, 2019-03)
      Resin injection is a less intrusive method of repair and does not require near the post processing of other composite repair methods. However, until recently this method of repair has not allowed the restoration of the ...
    • Material state monitoring using embedded sensors for validating models for detecting process-induced damages in polymer composites 

      Seneviratne, Waruna P.; Tomblin, John S.; Liyanage, Shakya S.; Shah, Hemal B. (DEStech Publications Inc., 2018)
      Composite material cure recipes are based on manufacturer-recommended cure cycle inputs, which are developed as a result of various stochastic cure kinetics models during the development of resin formulation. The time, ...
    • Multi-scale characterization of an adhesive bondline with fabrication induced defects 

      Fang, Eugene; Lua, Jim Y.; Zhang, Yongjie Jessica; Lai, Yicong; Seneviratne, Waruna P. (DEStech Publications, Inc., 2015)
      A multiscale characterization of an adhesive bondline is performed to investigate the fabrication defects dependent failure mechanisms of an I-beam under four point bending. To obtain a realistic representative volume of ...
    • Numerical studies on buckling and post-buckling behavior of stiffened curved composite panel with repairs 

      Seneviratne, Waruna P.; Saseendran, Vishnu; Perera, Shenal; Saathoff, Brandon L.; Rubesinghe, Dhanachandra L.; Tomblin, John S. (DEStech Publications, 2019-09)
      Composite stiffened panels are widely employed in the aircraft industry. In particular, curved panels stiffened with hat-stringers are utilized in fuselages. The panels comprise of very thin skin to which stringers are ...
    • Progressive damage and failure prediction of interlaminar tensile specimen with initial fabrication induced defects 

      Cui, Xiaodong; Karuppiah, Anand Vijay; Pham, Dinh Chi; Lua, Jim Y.; Saathoff, Caleb; Seneviratne, Waruna P. (DEStech Publications Inc., 2018)
      An automatic solution process to evaluate the effects of fabrication induced defects in composite components is developed. The framework of this approach includes defects extraction from the X-ray computed tomography (CT) ...
    • Progressive damage mechanisms in thick 3D composites structures under static and fatigue loading 

      Rao, Prabhakar M.; Gurvich, Mark R.; Waas, Nalinda W.; Palliyaguru, Upul R.; Seneviratne, Waruna P. (DEStech Publications, 2020-09)
      The objective of this work is to demonstrate validation of predictive capabilities capturing both damage initiation and growth under static and fatigue loading in geometrically complex three-dimensional (3D) composite ...
    • SIMULIA Abaqus simulations to predict compression-after-impact behavior 

      Krishnan, Arun; Perera, Shenal; Seneviratne, Waruna P. (DEStech Publications, 2019-09)
      Fiber-reinforced composites are receiving increased attention due to their superior mechanical properties compared to traditional materials. Since composites are made of multiple components, their failure mechanisms are ...