Analysis of hypersonic flow using three dimensional navier-stokes equations

Date

2016

Author

Özgün, Muharrem

Metadata

Show full item record

Item Usage Stats

248
views

0
downloads

Metallic materials in aerospace structures are exposed to impact type loads depending on their usage area. High strain rate material characterization of metallic materials is very crucial to properly prepare finite element models to be used in impact loading situations. Johnson-Cook material model is a suitable material model to represent the behaviour of metallic materials at high strain rates. In the present thesis study, parameters of the Johnson-Cook material model for Al 7075-T651 are determined utilizing the tensile test data in quasi-static loading condition and impact test data for impact loading condition. High strain rate material characterization of the metallic material is performed by the modified Taylor impact test and velocity interferometry. Modified Taylor impact test system and how the free surface velocity measurement by the velocity interferometry-VISAR is utilized for the determination of the strain rate constant of the Johnson-Cook material model are described in detail. Experimentally determined material constants are verified by simulating the modified Taylor impact test in Autodyn and comparing the experimentally and numerically determined free surface velocities.

Subject Keywords

Aerodynamics, Hypersonic., Computational fluid dynamics., Ballistic missile, Artificial satellites

URI

http://etd.lib.metu.edu.tr/upload/12620430/index.pdf
https://hdl.handle.net/11511/26002

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Material characterization at high strain rates using modified taylor impact test and velocity interferometry Kesemen, Latif; Kayran, Altan; Department of Aerospace Engineering (2016) Metallic materials in aerospace structures are exposed to impact type loads depending on their usage area. High strain rate material characterization of metallic materials is very crucial to properly prepare finite element models to be used in impact loading situations. Johnson-Cook material model is a suitable material model to represent the behaviour of metallic materials at high strain rates. In the present thesis study, parameters of the Johnson-Cook material model for Al 7075-T651 are determined utiliz...
Computational Investigation of the 3-D effects on Dynamic Fracture of Curved Composite Laminates Tamer Tahir, Ata; Çöker, Demirkan (2018-09-07) Composite materials are used more and more in aerospace, commercial and industrial applications due to high specific stiffness, strength and damage tolerance capability. The main advantage of composite materials, it allows the stiffness and strength of the material to change with direction of loading. Hence tailoring structıres to meet load requirements reduces weight and allows designer to optimize structure. Considering all these advantages, primary and secondary structural elements of recent commercial a...
Coupling of a multibody simulation tool for the analysis of rotary systems with a panel based flow solver and a navier-stokes flow solver Soğancı, Semih; Kayran, Altan; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2018) In rotorcraft design, aeroelastic effects on the main rotor blades play a critical role in the accurate estimation of the external loading acting on the structure. The external loading is mainly due to the aerodynamic loads and the inertial loads on the main rotor blades. High aspect ratio blades largely deform in flapping direction on top of rigid body flapping, and due to the rigid and elastic flapping motion, the airloads acting on the blades change continuously. Hence, the rotor blade loads analysis sho...
MECHANICAL PROPERTIES OF REPAIRED CARBON FIBER REINFORCED POLYMER COMPOSITES Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10) Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...
Investigation of wear behavior of aged and non-aged SiC-reinforced AlSi7Mg2 metal matrix composites in dry sliding conditions ÇELİK, YAHYA HIŞMAN; Demir, Mehmet Emin; KILIÇKAP, EROL; Kalkanlı, Ali (Springer Science and Business Media LLC, 2020-01-01) Metal matrix composites (MMCs) with their splendid mechanical properties have been specifically designed for use in fields such as aerospace and aviation. The presence of hard ceramic particles in MMC increases the hardness of the matrix product and decreases its coefficient of friction. Therefore, the wear resistance is improved. Moreover, the mechanical properties of these composite materials can be improved by applying heat treatments. In this study, AlSi7Mg2 MMCs with 15 wt% SiC reinforcement were produ...

Citation Formats

M. Özgün, “Analysis of hypersonic flow using three dimensional navier-stokes equations,” M.S. - Master of Science, Middle East Technical University, 2016.