A Theoretical Formula for Calculating Vickers Hardness Number for Spherical Surfaces / Eine theoretische Formel für die Berechnung der Vickershärte bei sphärischen Oberflächen

1989 ◽  
Vol 26 (1) ◽  
pp. 35-40
Author(s):  
Zou Xue-Zhi
Keyword(s):  
Vickers Hardness ◽  
Theoretical Formula ◽  
Vickers Hardness Number ◽  
Hardness Number ◽  
Spherical Surfaces

Contact Rigidity at Tool Shank of Turning Tools

1987 ◽  
Vol 109 (2) ◽  
pp. 169-172 ◽  
Author(s):  
E. Marui ◽  
S. Ema ◽  
S. Kato
Keyword(s):  
Experimental Investigation ◽  
Contact Area ◽  
Vickers Hardness ◽  
Flexural Rigidity ◽  
Vickers Hardness Number ◽  
Empirical Expressions ◽  
Contact Rigidity ◽  
Hardness Number ◽  
Tool Shank

This paper presents an experimental investigation of the contact rigidity between a turning tool shank and tool post. The contact rigidity is influenced by the flexural rigidity of tool shank, contact area in the tool shank and the Vickers hardness number of the shank material. The effects of these parameters on the contact rigidity are estimated by simple empirical expressions.

Microstructural Characterization and Properties of Sn-Ag-Cu (SAC) Compound Induced by Zn Alloying

2017 ◽  
Vol 16 ◽  
pp. 33-36 ◽  
Author(s):  
Stewart M. Go Roa ◽  
Eduardo Magdaluyo Jr. ◽  
Wojciech Gierlotka
Keyword(s):  
Structural Analysis ◽  
Vickers Hardness ◽  
Microstructural Characterization ◽  
Minimal Amount ◽  
Microstructural Properties ◽  
Constant Composition ◽  
Vickers Hardness Number ◽  
Hardness Number ◽  
Fine Microstructure

The microstructural properties and intermetallic (IMC) formation of Sn-Ag-Cu (SAC) through varying amounts of zinc were examined in this study while having tin held at constant composition. Samples were prepared and heated in a furnace for 168 hours to achieve complete solidification and homogenization. Results showed relatively fine microstructure primarily containing Sn dendrites, eutectic, and pro-eutectic phases. Microstructures for each alloy was similar for which majority of them formed copper-based IMCs and Sn dendrites. The alloy (0.7Sn-0.15Ag-0.1Cu-0.05Zn) containing minimal amount of zinc with high amount of Ag resulted to high Vickers hardness number. Structural analysis showed that these group of alloys composed mainly of β-Sn, Cu6Sn5, and Ag3Sn.

scholarly journals Evaluation of Vickers Hardness Number of Al-Si Alloy Under Heat Treated Conditions

2021 ◽  
Vol 10 (6) ◽  
pp. 222-227
Author(s):  
Jayasheel Kumar K A ◽  
◽  
C M Ramesha ◽  
Keyword(s):  
Heat Treatment ◽  
Vickers Hardness ◽  
Precipitation Hardening ◽  
Heat Treatment Condition ◽  
Vickers Hardness Number ◽  
Hardness Tester ◽  
Hardness Number ◽  
Heat Treated ◽  
Hardness Property ◽  
Property Assessment

The paper deal with the hardness property assessment of various Al-Si alloys under heat treated conditions. The tested specimens have the compositions of Si with percentages such as 12 18 and 24. The fabrication of the selected composition is carried out by melting the material to the melting temperature of around 800°C. The material is subjected to solutionised heat treatment for 3 hours at 500°C, 520°C and 535°C and quenched in water. Further aging is carried out at 155°C for 2 hours, 5 hours and 8 hours respectively for 500°C, 520°C and 535°C of solution heat treatment condition. The hardness property is evaluated using Vickers Hardness tester as per the standards of ASTM- E92. Thorough comparison of Vickers hardness number is performed among the as- cast and various heat treated environment. Desirable properties of alloy are observed at 520°C solutionised heat treatment & 5 hours of precipitation hardening at 155°C for 18% of Silicon composition. The hardness value decreases due to the increase in percentage of silicon and the values are observed.

Effects of gamma radiation on poly(methyl methacrylate)/single-wall nanotube composites

2002 ◽  
Vol 17 (10) ◽  
pp. 2507-2513 ◽  
Author(s):  
P. A. O'Rourke Muisener ◽  
L. Clayton ◽  
J. D'Angelo ◽  
J. P. Harmon ◽  
A. K. Sikder ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Vickers Hardness ◽  
Radiation Effects ◽  
Pure Pmma ◽  
Vickers Hardness Number ◽  
Poly Methyl Methacrylate ◽  
Hardness Number ◽  
The Matrix ◽  
Nanotube Composites

Single-wall carbon nanotube (SWNT)/poly(methyl methacrylate) (PMMA) composites were fabricated and exposed to ionizing radiation for a total dose of 5.9 Mrads. Neat nanotube paper and pure PMMA were also exposed for comparison, and nonirradiated samples served as controls. A concentration of 0.26 wt% SWNT increased the glass transition temperature (Tg), the Vickers hardness number, and modulus of the matrix. Irradiation of the composite did not significantly change the Tg, the Vickers hardness number, or the modulus; however, the real and imaginary parts of the complex permittivity increased after irradiation. The dielectric properties were found to be more labile to radiation effects than mechanical properties.

Vickers Microhardness Dependence Load and Determining of Tensile Strength of HQ 705 Steel from Microhardness Curves

2016 ◽  
Vol 842 ◽  
pp. 43-52 ◽  
Author(s):  
Viktor Malau ◽  
Latif Arifudin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Alloy Steel ◽  
Vickers Hardness ◽  
Vickers Microhardness ◽  
Hardness Test ◽  
Indentation Load ◽  
Holding Time ◽  
Raw Material ◽  
Vickers Hardness Number

Vickers microindentation hardness test has been applied for a long time to determine the mechanical properties of a small volume of samples. The procedure of this hardness test consists of using a constant load on a rigid indenter and measuring the dimensions of the indenter residual impression (indentation imprint) on the surface of the sample tested after loading and unloading. The objective of this research is to characterize the mechanical properties and material constants of HQ (High Quality) 705 alloy steel mainly its VHN (Vickers Hardness Number) and tensile strength before and after quenching and tempering heat treatments. The characterization is based on Vickers microhardness dependence load curves.Quenching treatment was performed in a furnace by heating the samples at austenite temperature of 850 o C with holding time of two hours and then the samples were rapidly cooled in oil bath. Tempering processes were conducted by heating again the quenching samples to temperatures of 150, 200, 250, 300, 350, 400, 450, 500, 550 and 600 o C with holding time of two hours for each sample. Finally, all samples were slowly cooled in atmospheric temperature. The mechanical properties of samples were characterized by using Vickers microhardness dependence load curves.The results show that VHN (Vickers Hardness Number) depends on indentation load and VHN increases with increment of load for indentation load lower than 5 N. VHN is almost constant for indentation load greater than 5 N. The raw material (without heat treatment) has the VHN and tensile strength of 3413 MPa and 1050.61 MPa respectively and the quenched samples have the VHN and tensile strength of 5407 and 1861 MPa respectively. The Vickers hardness and tensile strength decrease with the increment of tempering temperatures. The higher tempering temperature produces lower hardness and tensile strength. The raw material tensile strength of 1058.8 MPa obtained by tensile test is comparable to its tensile strength of 1050.61 MPa obtained by Vickers indentation. This result indicates that Vickers microindentation is valid to use for evaluating the tensile strength of HQ 705 alloy steel.

scholarly journals Structure, Composition, and Mechanical Properties of Australian Orthodontic Wires

2009 ◽  
Vol 79 (1) ◽  
pp. 97-101 ◽  
Author(s):  
Brian M. Pelsue ◽  
Spiros Zinelis ◽  
T. Gerard Bradley ◽  
David W. Berzins ◽  
Theodore Eliades ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Vickers Hardness ◽  
Modulus Of Elasticity ◽  
Sem Analysis ◽  
Orthodontic Wires ◽  
Vickers Hardness Number ◽  
X Ray ◽  
Level Of Significance ◽  
Lower Tensile Strength

Abstract Objective: To investigate the surface morphology, structure, elemental composition, and key mechanical properties of various sizes and tempers of Australian wires. Materials and Methods: Three types of Australian wire were used: 0.016″ regular, 0.018″ regular+, and 0.018″ special+ (A.J. Wilcock, Whittlesea, Victoria, Australia). Each type of wire was subjected to scanning electron microscopy (SEM) analysis, x-ray energy dispersive spectroscopy (EDS) investigation, Vickers hardness testing, and tensile testing. The modulus of elasticity and ultimate tensile strength were determined. Hardness, modulus, and strength data were analyzed with one-way analysis of variance (ANOVA) and Tukey testing at the .05 level of significance. Results: All three types of Australian wire were found to possess considerably rough surfaces with striations, irregularities, and excessive porosity. All three wire types had high levels of carbon and a similar hardness, which ranged within 600 VHN (Vickers hardness number), and a similar modulus of elasticity (173 to 177 GPa). The 0.018″ special+ had a significantly lower tensile strength (1632 MPa) than the 0.016″ regular and the 0.018″ regular+ wire (2100 MPa). Conclusions: Australian wires did not show variation implied by the size or temper of the wires.

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