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Introduction Non-destructive testing (NDT) of materials are commonly performed to identify, characterize, assess voids, defects and damage in materials [1].
The amount of energy lost through absorption depends upon the elastic properties of the material being tested [16] while loss due to scattering in materials also depends on the ratio of grain size and wavelength [6].
Moreover, it is possible due to the close association of the ultrasonic waves with the elastic and inelastic properties of the materials [17].
Hussain, Structural Studies of Lithium Boro Tellurite Glasses doped with Praseodymium and Samarium Oxides, Materials Research Bulletin 47 (2012) 3489-3494
Dongri, Ultrasonic NDE Techniques for Impact Damage Inspection on CFRP Laminates, Journal of Materials Science Research 1(1) (2012) 2-16

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With the advancement of science and technology, the precision of processing mechanical parts is increasingly high demand, the increasing number of small diameter deep hole parts, which puts forward higher requirements of deep hole processing equipment and Gun-Drill sharpening devices.
With the wearing and tearing of gun drill in the process of machining, especially the processing of stainless steel and heat resistant alloy material products, the consumption is high, processing quality is poor, cutting tool is worn,when the wear reaches the dulling standard, the tool should be grinded immediately.But due to the grinding device production haven't been widely used in current domestic market,the relevant process is still not known, and the gun drill price relatively expensive,one gun drill is in two thousand yuan of above, if the problem of good tool resharpening cannot be solved,the processing costs would be an inevitable impact.Therefore, the design of gun drill grinding device is imminent.
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(12) Metallic materials, however, are not ideally plastic, but show certain hardening.
Acknowledgement The kind support of the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic and the Slovak Academy of Sciences under the VEGA 2/0098/14 grant project is highly appreciated.
Semrád, Fatigue and Buckling Strength Analysis of the Wing Hinge in the Creo Simulation Environment, Journal of Mechanics Engineering and Automation. 4 (2013) 247-250
Rasmussen, Full–range stress–strain curves for stainless steel alloys, Journal of Constructional Steel Research 59 (2003) 47–61
Novotný, Numerical Analysis of the Influence of Material Model on Response of Compressed Imperfect Thin-Walled Channel, Applied Mechanics and Materials. 611 (2014) 188-193

Materials and methods Materials.
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Xi., Preparation of PLA/Nano-ZnO Composites, Advanced Materials Research, 476–478 (2012)1901- 1904
Melting behavior and cold crystallization, Journal of Applied Polymer Science 112 (2009) 3149-3156
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Preparation and characterization, Journal of Applied Polymer Science 112 (2009) 1688-1694
IOP Conference Series.: Material Science Engineering 461(2018) 1-6