Now showing items 68-87 of 158

  • Failure mechanisms and energy dissipation in composite off-axis tension specimens with open holes 

    Kolachalama, Annapurna (2007-05)
    Predicting failure of fabric composite laminates in the presence of flaws such as cracks and stress raisers has been an important research problem for the last two decades. Most of the existing models for predicating notched ...
  • Fatigue life determination of a damage-tolerant composite airframe 

    Seneviratne, Waruna Prasanna (Wichita State University, 2008-12)
    The methodology proposed in this research extends the current full-scale test approach based on the life factor and the load enhancement factor, and provides information necessary to define inspection intervals for composite ...
  • Fatigue life estimation of notched aluminum sheet specimens subjected to periodic tensile overloads 

    Caiado, Floyd (Wichita State University, 2010-08)
    Structural elements are subjected to variable amplitude/spectrum fatigue loading where tensile overloads and compressive underloads may occur randomly. Depending on the magnitude of these loads, localized plastic deformation ...
  • Fatigue life estimation of notched aluminum sheet specimens subjected to periodic tensile overloads 

    Caiado, Floyd (Wichita State University. Graduate School, 2010-04-23)
    The objective of this study was to determine the applicability of an approach to predict the number of cycles of fatigue loading of a structure to failure.In the present investigation, notched structural elementswere ...
  • Feasibility of morphing aircraft propeller blades 

    Dorfling, Johann (Wichita State University, 2014-07)
    The aim of this study is to assess the feasibility of variable geometry aircraft propeller blades, the main focus being on the aerodynamic performance. A number of objectives are established to reach this goal, with the ...
  • Finite element and analytical models for load transfer calculations for structures utilizing metal and composites with large CTE differences 

    Meka, Uday Sankar (2007-05)
    Large composite structures have been increasingly used in the aviation industry. In order to achieve higher fuel efficiency, the use of light-weight, high-strength composite materials, such as carbon/epoxy, needs to be ...
  • Finite element application for strength analysis of scarf-patch-repaired composite laminates 

    Chou, Shih-Pin (2006-12)
    The composite scarf joint configuration was utilized to simulate scarf-patch-repaired composite panels. An adhesive bonded scarf (tapered) joint was selected due to less peeling and shear stress over the bondline than with ...
  • Finite element modeling of single shear fastener joint specimens: a study of clamp-up, friction and plasticity effects 

    Ghods, Farzad (Wichita State University, 2011-12)
    A three dimensional solid finite element model was assembled to investigate the influence of parameters such as friction coefficient, fastener preload and material plasticity on the structural response of Hi-Lok bolted ...
  • Flight environment of the propellers on commuter aircraft 

    Dorfling, Johann (Wichita State University, 2008-12)
    Data obtained from digital flight data recorders installed on a fleet of 27 Beech 1900Ds are used to assess the actual operational environment of propellers on commuter aircraft. The data consists of 910 complete flights ...
  • Flight loads monitoring of USFS aerial supervision modules 

    Kliment, Linda K.; Rokhsaz, Kamran; Menon, Alok; Nelson, John; Terning, Brett; Weinstein, Edward M. (American Institute for Aeronautics and Astronautics, Inc., 2014-01-17)
    The USFS has collected flight data on Beechcraft King Airs which are being used as Aerial Supervision Modules. Data from seven aircraft is presented. The missions are separated into four flight phases: climb, cruise, ...
  • Flight loads spectra of two business jets 

    Rokhsaz, Kamran; Kliment, Linda K.; Weinstein, Edward M. (American Institute for Aeronautics and Astronautics, Inc., 2014-01-17)
    Operational flight loads have been analyzed from two business jets, a Global 5000 and a Global Express XRS. It is shown that due to the differing nature of their missions, both airframes were subjected to nearly the same ...
  • Fracture mechanics of sandwich structures 

    Denning, Shawn Patrick (Wichita State University, 2013-05)
    Over the past few decades both the demand for knowledge as well an increase in the application of composite materials has boomed. This has led to an intensive focus by the research community to gather information and ...
  • Generalization of the collision cone approach for motion safety in 3-D environments 

    Chakravarthy, Animesh; Ghose, Debasish (Springer, 2012-02)
    Avoidance of collision between moving objects in a 3-D environment is fundamental to the problem of planning safe trajectories in dynamic environments. This problem appears in several diverse fields including robotics, air ...
  • High-order incompressible Navier-stokes equations solver for blood flow 

    Khurshid, Hassan (Wichita State University, 2012-07)
    A high-order finite difference solver was written to solve the incompressible Navier-Stokes (NS) equations and was applied to analyze the blood flow. First, a computer code was written to solve incompressible Navier- Stokes ...
  • A hybrid scheme for the numerical simulation of shock/discontinuity problems 

    Mahmoudnejad, Niloufar; Hoffmann, Klaus A. (Taylor & Francis, 2011)
    To address accuracy issues for direct numerical simulation, a hybrid scheme based on the weighted compact scheme (WCS) and weighted essentially non-oscillatory (WENO) scheme is developed. The new hybrid method incorporates ...
  • Ice particle trajectory simulation 

    Suares, Ian Greg (Wichita State University, 2005-12)
    Large ice particles shed from an airframe can cause damage to downstream aerodynamic surfaces and aft mounted engines. A simulation tool was developed to compute the trajectories of shed ice particles and determine the ...
  • Kinetics of prepreg epoxy resin curing for aircraft body repair 

    Dahanayake, Jayangika (Wichita State University. Graduate School, 2014-04-25)
    Curing is the cross-linking of polymer chains, which results in toughening of polymer material and it is widely used in bonded composite repair for aerospace components. The main objective of this project is to analyze ...
  • Load rate effects on Interlaminar fracture toughness of composite materials 

    Nandakumar, Pratap Nuggehalli; Keshavanarayana, Suresh R. (Wichita State University. Graduate School, 2009-05-01)
    The energy dissipation due to the failure of composites is of particular interest for crash applications involving dynamic loading. Separation of layers or delamination which can occur in opening (mode-I) is one of the key ...
  • Load rate effects on the crush response of laminated corrugated beams 

    Tan, Kian Yip; Fazal Elyas, Sana (Wichita State University. Graduate School, 2010-04-23)
    This experimental study addresses the progressive crushing responses of laminated corrugated beams fabricated using Newport NB321/7781 E-glass prepreg material. Stacking sequences of [0]n and [45]n where n=4,8 and 12 have ...
  • Local bending containment in impact damaged sandwich panels 

    Ghimire, Mohan (Wichita State University. Graduate School., 2007-04-27)
    A repair technique involving the containment of local bending of sandwich facesheet by strategically filling honeycomb core cells has been explored to improve the damage tolerance of impact damaged sandwich panels. The ...