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Sökning: WFRF:(Yildiz Yunus)

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  • Yildiz, Yunus, et al. (författare)
  • COATED NANOPOROUS STRUCTURES SUBJECTED TO STRESS RELIEF ANNEALING
  • 2018
  • Ingår i: Proceeding to NSCM31.
  • Konferensbidrag (refereegranskat)abstract
    • In this study, the mechanical improvement of the platinum coated nanoporous gold is investigated by performing molecular dynamics simulations. The tensile properties of the structure is enhanced by a stress relief annealing which prevents the high stress concentration observed between the coating and the core materials. The annealing process is performed at 500K for 100ps with a heating and cooling rate of 1K/ps. After the annealing process, tensile loading is applied to the coated structure with a strain rate of 0.001ps-1. According to the result of the tensile analysis, the Young’s modulus increases from 12.2 to 15.25 GPa while the yield strength enhances from 584 to 615 MPa.
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  • Yildiz, Yunus, et al. (författare)
  • Strain Rate Effects on Tensile and Compression Behavior of Nano-crystalline Nanoporous Gold: A Molecular Dynamic Study
  • 2020
  • Ingår i: Mechanics of Materials. - : Elsevier BV. - 0167-6636. ; 143
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, strain rate effects on the tensile and compressive properties of nano-crystalline nanoporous gold (nc-NPAu) are investigated by performing molecular dynamics simulations. For this purpose, atomistic models of nc-NPAu structures with three different grain sizes are generated through a novel modeling technique based on the Voronoi tessellation method. Additionally, an adaptive common neighbor analysis (aCNA) is carried out to examine the evolution of the crystal structure. In this way, the deformation mechanisms of nc-NPAu atomistic models are thoroughly investigated. The findings point out that mechanical properties of nc-NPAu specimens such as toughness, ultimate and yield strengths grow at increasing strain rates for both tensile and compressive loadings while their elastic moduli exhibit less significant variations at different strain rates. Furthermore, the study also shows that in addition to dislocation motion, several other deformation mechanisms including grain rotation, grain boundary sliding and grain travelling are observed to be effective for nc-NPAu.
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5.
  • Glasbey, JC, et al. (författare)
  • 2021
  • swepub:Mat__t
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6.
  • 2021
  • swepub:Mat__t
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  • Resultat 1-6 av 6

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