Now showing items 1-20 of 151

    • Alternate method for determining yield strength of polymer additive manufacturing 

      Park, Chul Y.; Rupel, Keith E.; Henry, Chelsey E.; Malik, Kevin F.; Ghose, Sayata; Palliyaguru, Upul R. (ASTM International, 2020-09-01)
      Additive manufacturing (AM) technology offers potential cost savings, production efficiencies, and unique design features that cannot be easily achieved through traditional manufacturing. However, it is known that the final ...
    • Regional CubeSat constellation design to monitor hurricanes 

      Chadalavada, Pardhasai; Dutta, Atri (IEEE, 2021-11-13)
      State-of-the-art weather forecasting systems depend on a variety of data collected by airborne, orbiting, and ground sensors. Regional CubeSat constellations have the potential to improve hurricane forecasting by collecting ...
    • Low-frequency noise control using layered granular aerogel and limp porous media 

      Xue, Yutong; Dasyam, Amrutha; Bolton, J. Stuart; Sharma, Bhisham N. (Institute of Noise Control Engineering, 2021-08-01)
      The acoustic absorption of granular aerogel layers with a granule sizes in the range of 2 to 40 μm is dominated by narrow-banded, high absorption regions in the low-frequency range and by reduced absorption values at higher ...
    • 3D printed multifunctional low-frequency sound absorbers 

      Johnston, William; Kankanamalage, Pulitha G.; Sharma, Bhisham N. (Institute of Noise Control Engineering, 2021-08-01)
      Cellular porous materials are an attractive choice for lightweight structural design. However, though their open porous architecture is ideally suited for multifunctional applications, their use is typically limited by the ...
    • Coupled analysis of low-velocity impact damage and compression after impact strength of composite laminates 

      Borkowski, Luke B.; Kumar, Rajesh S.Dinesh; Palliyaguru, Upul R. (American Society of Civil Engineers, 2021-09)
      A coupled analysis of impact damage and compression-after-impact (CAI) strength of laminated composite plates was conducted using efficient analytical and semianalytical models with the goal of demonstrating and validating ...
    • In-plane shear response of a composite hexagonal honeycomb core under large deformation – A numerical and experimental study 

      Shahverdi Moghaddam, Hooman; Keshavanarayana, Suresh R.; Ivanov, Dmitry S.; Yang, Chihdar Charles; Horner, Allison L. (Elsevier, 2021-07-15)
      In the present work, experimental shear tests using a custom-built picture-frame shear fixture have been conducted to investigate the in-plane pure-shear response of an HRP-C fiberglass/phenolic hexagonal honeycomb core ...
    • Additive manufacturing of fibrous sound absorbers 

      Johnston, William; Sharma, Bhisham (Elsevier, 2021-05-01)
      We investigate the possibility of additively manufacturing fibrous sound absorbers using fused deposition modeling. Two methods for 3D printing fibers are proposed. The fiber bridging method involves extruding the filament ...
    • Predictive maintenance on aircraft and applications with digital twin 

      Heim, Sam; Clemens, Jason R.; Steck, James E.; Basic, Christopher; Timmons, David; Zwiener, Kourtney (IEEE, 2021-03-19)
      The concept of predictive maintenance in aiding the manufacturing and operation of equipment is moving several industries forward, allowing for a more detailed description and justification of maintenance routines. This ...
    • Acoustic absorption properties of granular silica aerogels 

      Dasyam, Amrutha; Khaleel, Ola; Sharma, Bhisham N. (Institute of Noise Control Engineering, 2020-10-12)
      Aerogels are a class of synthetic materials derived using supercritical drying to extract the liquid component of a gel and replacing it with a gas. This process results in the formation of an ultra-lightweight nanoporous ...
    • Anisotropic hyperelastic constitutive modeling of in-plane finite deformation responses of commercial composite hexagonal honeycombs 

      Shahverdi Moghaddam, Hooman; Keshavanarayana, Suresh R.; Yang, Chihdar Charles; Horner, Allison L. (SAGE Publications, 2021-02-18)
      This research presents the adaptation of an anisotropic hyperelastic constitutive model for predicting the experimentally observed in-plane, orthotropic, bi-modular and nonlinear-elastic responses of a commercial adhesively ...
    • A comparison of the two and four microphone methods for deriving the characteristic acoustic properties of porous materials 

      Lomte, Amulya; Wojciechowski, Brittany; Sharma, Bhisham (Institute of Noise Control Engineering, 2020-10-12)
      The characteristic acoustic impedance and wave number of a porous material can be derived using either a two microphone or a four microphone impedance tube setup. For the four microphone method, these complex properties ...
    • Real-time adaptive optimal prediction of safe control spaces and augmented-reality head-up displays towards aircraft loss-of-control mitigation 

      Rafi, Melvin; Steck, James E.; Chakravarthy, Animesh (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      Predictive systems capable of alerting pilots to impending entry into a loss-of-control event have potential to improve safety in flight. Towards this end, the General Aviation Flight Lab at Wichita State University has ...
    • High-fidelity response prediction and failure evaluation of tapered composite components under multiaxial loading 

      Xiao, Jian; Liu, Phillip; Pham, Dinh Chi; Cui, Xiaodong; Lua, Jim Y.; Perera, Shenal; Saathoff, Caleb (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      This paper presents an accurate and efficient modeling approach for high-fidelity 3D stress prediction and failure initiation and propagation modeling of tapered composite flexbeams with multiple ply drops subjected to ...
    • Preliminary flight loads analysis of MD-87 as a heavy airtanker 

      Rokhsaz, Kamran; Kliment, Linda K.; Nelson, John A. (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      Results of analyzing in-flight recorded data from a fleet of five MD-87 airtankers flown in support of the United States Forest Service aerial firefighting operations are reported. Data has been available from two different ...
    • Exploratory study of C-130 flight loads in forest service operation 

      Kliment, Linda K.; Rokhsaz, Kamran; Ali, Syed J.; Nelson, John A. (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      Operational load factors for C-130 airtankers flown in support of the United States Forest Service firefighting efforts are presented. In total, the results are based on 1,454 flights, with 792 hours of flight time. The ...
    • Experimental and numerical failure analyses of composite cruciform under biaxial static and cyclic loading 

      Pham, Dinh Chi; Xiao, Jian; Lua, Jim Y.; Perera, Shenal; Saathoff, Caleb (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      The characterization and prediction of multiaxial fatigue of composite structures have become a very important topic since aircraft composite structures and their repaired bonded structures are unavoidably subjected to ...
    • Piloted simulator evaluations of an adaptive loss-of-control avoidance prediction architecture and augmented-reality pilot advisory display 

      Rafi, Melvin; Schmitz, Justin; Menon, Alok N.; Ross, Robert H.; Qamar, Abbas; Steck, James E.; Chakravarthy, Animesh (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      Loss-of-control in-flight has consistently been the primary contributor to air accidents worldwide. Towards mitigating aircraft loss-of-control, the General Aviation Flight Lab at Wichita State University has developed an ...
    • A brief survey of vortex models 

      Kuenn, Aaron Douglas; Kliment, Linda K. (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      Some of the many models for vortices are presented. The goal of this article is to provide the reader a brief overview of the available models and present some comparisons of the models for character, utility, and accuracy. ...
    • Life of composites under variable-amplitude fatigue using ST method 

      Seneviratne, Waruna P.; Tomblin, John S. (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      The primary goal in a damage-tolerance certification program is to avoid catastrophic failure due to fatigue, corrosion, or accidental damage throughout the operational life of the aircraft. The damage-tolerance philosophy ...
    • Exploratory study of c-130 usage in forest service operation 

      Kliment, Linda K.; Rokhsaz, Kamran; Ali, Syed J.; Nelson, John A. (American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)
      Ground-air-ground usage results are presented for two EC-103Q and two L-382G aircraft being used in support of USFS in fighting forest fires. The results are based on flights containing retardant drops as well as ferry and ...