Now showing items 21-40 of 43

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Evaluation of ls-dyna mat162 for modeling composite fastener joints for high rates of loading 

      Kona Ravi, Aswini; Bhasin, Akhil; Gomez, Leandro; Olivares, Gerardo; Gomez, Adrian; Keshavanarayana, Suresh R.; Pang, Jenna K.; Molitor, Matthew; Rassaian, Mostafa (American Institute of Aeronautics and Astronautics Inc., 2019-01)
      In the present work, the behavior of composite-fastener joints in bearing failure at dynamic stroke rates of 500 in/s, 300 in/s and 100 in/s has been evaluated through progressive damage analysis (PDA) material model in ...
    • Refill friction stir spot welding of surface-treated aerospace aluminum alloys with faying-surface sealant 

      Boldsaikhan, Enkhsaikhan; Fukada, Shintaro; Fujimoto, Mitsuo; Kamimuki, Kenichi; Okada, Hideki (Elsevier, 2019-06)
      Refill friction stir spot welding (RFSSW) is a derivative of friction stir spot welding (FSSW). Unlike conventional FSSW, it does not leave behind an exit hole in the workpiece. Kawasaki Heavy Industries (KHI) developed a ...
    • Crashworthiness by analysis: verifying FEA modeling capabilities by accident reconstruction 

      Zinzuwadia, Chandresh M.; Olivares, Gerardo; Ly, Hoa T.; Gomez Valbuena, Luis M. (ASCE, 2018-11-15)
      A finite element (FE) model of a generic single-aisle narrow body transport aircraft was used for computational crash analysis to compare simulated deformations to those observed in the Turkish Airline Flight 1951 crash ...
    • 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 ...
    • Learning robotic grasping strategy based on natural-language object descriptions 

      Rao, Bharath; Krishnan, Krishna K.; He, Hongsheng (IEEE, 2018-10)
      Given the description of an object's physical attributes, humans can determine a proper strategy and grasp an object. This paper proposes an approach to determine grasping strategy for an anthropomorphic robotic hand simply ...
    • Automated scanning techniques using UR5 

      Lopez-Hawa, Homar; VanPelt, Alexander; Emmanuel, Suveen; Yihun, Yimesker S. (Hindawi, 2019-02-03)
      This study seeks to advance technologies pertaining to integration of low-cost collaborative robots to perform scanning operations where moderate accuracy is needed. Part inspection is an almost universal aspect of ...
    • High rate testing of composite fastener joints with and without clamp-up 

      Gomez, Adrian; Keshavanarayana, Suresh R.; Castillo, Luis D.; Kona Ravi, Aswini; Bhasin, Akhil; Pang, Jenna K.; Molitor, Matthew; Rassaian, Mostafa (DEStech Publications Inc., 2018)
      The NASA Advanced Composites Consortium (ACC) High Energy Dynamic Impact (HEDI) group has been investigating experimentally the effects of testing speed and fastener clamp-up on the behavior of single lap shear composite ...
    • 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 ...
    • 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, ...
    • 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 ...
    • 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) ...
    • 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, ...
    • Chapter 39 -- Updating composite materials handbook-17 volume 5— ceramic matrix composites 

      Douglas Kiser, J.; David, Kaia E.; Davies, Curtis; Missri-Andrulonis, Rachael; Ashforth, Cindy (Wiley, 2018)
      This chapter discusses the updated version of CMH‐17 Volume 5—Ceramic Matrix Composites handbook released in 2002, which provides a more comprehensive overview of current Ceramic Matrix Composites (CMC) technology. Emphasis ...
    • Refill Friction Stir Spot Joining for aerospace aluminum alloys 

      Boldsaikhan, Enkhsaikhan; Fukada, Shintaro; Fujimoto, Mitsuo; Kamimuki, Kenichi; Okada, Hideki; Duncan, Brent; Bui, Phuonghanh; Yeshiambel, Michael; Brown, Brian M.; Handyside, Alan Bruce (Springer, 2017)
      Refill Friction Stir Spot Joining (RFSJ) developed by Kawasaki Heavy Industries (KHI) is a derivative technology of friction stir spot welding for joining aerospace aluminum alloys. The aerospace aluminum alloys were ...
    • 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 ...
    • ACG MTM45-1: Material Model Development Final Project Wrap-Up 

      Shahkarami, A.; Van Ee, D. (Wichita State University. National Institute for Aviation Research, 2009-11-15)
      National Center for Advanced Material Performance document prepared by: A. Shahkarami and D. Van Ee. Reviewed by: D. Van Ee Approved: A.Poursartip. Date: November 15th, 2009 Version: 1.0