Methods for superficial hardness test (Rockwell method) and for verification of superficial hardness testing machines (Rockwell method)

2015 ◽  
Keyword(s):  
Hardness Test ◽  
Hardness Testing

scholarly journals Thermoset Polymer Splicing Study Using a variation of welding

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Adi Prastyo Utomo ◽  
Prantasi Harmi Tjahjanti
Keyword(s):  
Hardness Test ◽  
Test Sample ◽  
Test Method ◽  
Polymer Materials ◽  
Hardness Testing ◽  
Hot Gas ◽  
Thermoset Polymer ◽  
Materials Used ◽  
Thickness Variations ◽  
Plastic Welding

There is not much plastic welding currently done and not much research has been done on plastic welding. The purpose of this study was to study the use of welding variations used to join the thermoset polymer material. The thermoset polymer materials used are acrylic, melamine and bakelit with the test sample measuring 80mm in length, 30mm in width and 3mm in thickness. Variations in welding are used using hot gas welding, electric soldering and gas torches. The test method is carried out after welding to determine the porosity of the weld using a penetrant liquid. Hardness testing was also carried out. The best welding results are shown on acrylic material using electric solder, showing that the amount of porosity is the least, and has the highest hardness test.

scholarly journals Rockwell Hardness Testing of Pure Nickel Collimators for BNCT Application

2019 ◽  
Vol 36 (1) ◽  
pp. 23-27
Author(s):  
Erasmus Prakasita ◽  
Yohanes Sardjono ◽  
Budi Setyahandana
Keyword(s):  
Centrifugal Casting ◽  
Hardness Test ◽  
Hardness Testing ◽  
Hardness Number ◽  
Boron Neutron Capture ◽  
Material Hardness ◽  
Before And After ◽  
The Difference ◽  
Almost All

In this study, Rockwell and Brinell hardness testing was used to examine material hardness. These methods were chosen because they are easy to carry out, relatively inexpensive, and almost all sizes and shapes can be tested, in which nickel hardness before and after centrifugal casting are identified and compared. These tests enable the determination of the hardness numbers of nickel collimators using for boron neutron capture therapy. The samples were five nickel plates with a dimension of 4.5 × 4.5 cm and five collimators. The collimators were cylindrical and made using centrifugal casting. The basic principle of the hardness test was to apply loading on the object being tested. The Rockwell test was used to assess the material's hardness from the difference of indentation depth, while the Brinell test was used to determine the hardness from the diameter of indentation. From the results of this test, the hardness number of nickel before centrifugal casting is 168.53 BHN or 86.13 HRB, while the hardness number after centrifugal casting is 115.68 BHN or 64.84 HRB. It can therefore be concluded that centrifugal casting decreased nickel hardness.

Analysis of Load-Displacement Curves of Ceramics Measured with Low-Load Vickers Hardness Test: Indentation Size Effect

2011 ◽  
Vol 492 ◽  
pp. 9-13
Author(s):  
Bei Xu ◽  
Jiang Hong Gong
Keyword(s):  
Size Effect ◽  
Vickers Hardness ◽  
Indentation Size Effect ◽  
Hardness Test ◽  
Hardness Testing ◽  
Indentation Size ◽  
Nanoindentation Testing ◽  
Low Load ◽  
Load Displacement ◽  
Vickers Hardness Test

The load-displacement curves for a series of ceramic and glass samples were recorded continuously during the low-load Vickers hardness testing. Then the hardnesses of all samples were determined by analyzing the unloading curves. It was found that all the test materials exhibit indentation size effect (ISE) similar to that observed in nanoindentation testing. The applicability of the proportional specimen resistance (PSR) model and the modified PSR model was then examined using the measured indentation data.

Comparison of Hardness and Microstructure of Cast Wheel and Spoke Wheel Rims of Motorcycles Made of Aluminum Alloy Alloy

2021 ◽  
Vol 892 ◽  
pp. 81-88
Author(s):  
Husaini ◽  
Ali Nurdin ◽  
Abdillah Sofian ◽  
Nuzan Rizki Muhammad
Keyword(s):  
Aluminum Alloy ◽  
Manufacturing Process ◽  
Mechanical Characteristics ◽  
Hardness Test ◽  
Hardness Testing ◽  
Average Hardness ◽  
Vehicle System ◽  
Compressive Loads ◽  
The Difference ◽  
Main Components

The rim is one of the main components in a motorized vehicle system, both two and three wheels. Rim loads when used are dynamic and often even shock. This study aims to study the mechanical characteristics, especially the hardness properties of spoke wheel rims and cast wheel rims made of aluminum alloy used in motorcycles and compare the results. Hardness testing is carried out on the spoke wheel and cast wheel specimens, using the Rockwell method with an identifier of 1/16 ball and a spectrometer used for both microstructure observations. The result of the average hardness test for the spoke wheel is HRB 99.3, while for the cast wheel is HRB 76.5. From the hardness test, it can be concluded that the hardness of the spoke wheel type is higher than the cast wheel type due to the difference in the manufacturing process. Cast wheel rims can withstand a load of 3 tons (30000 N) and the value of rim tension that can be accepted until the fracture is 45.84 MPa. Meanwhile, spoke wheel rims have the ability to withstand smaller compressive loads than cast wheel rims, which are 2 tonnes (20000 N) and the rims can accept the stress of 66.04 MPa until they break.

Hardness and microstructure investigation of steel rod ST 42 coated by chrome steel using wire arc spray coating

2018 ◽  
Vol 2 (90) ◽  
pp. 69-76
Author(s):  
P. Puspitasari ◽  
A. Yudhistantra ◽  
A.S. Haryono ◽  
J.W. Dika ◽  
M. Achyarsyah ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Particle Temperature ◽  
Spray Coating ◽  
Hardness Test ◽  
Test Method ◽  
Wire Arc Spray ◽  
Low Carbon ◽  
Hardness Testing ◽  
Chrome Steel ◽  
Arc Spray

Purpose: This research aimed to examine the hardness, surface roughness and microstucture in the Steel Rod ST 42 coated by chrome steel using wire arc spray coating with variations in spraying current of 140, 155, 170 and 180 Ampere. Design/methodology/approach: There was 12 specimens consisting of 3 specimens for each variation of the electric current coating. The specimens were cut to 30 mm in length and 27 mm in diameter; as many as 4 x 3 pieces, each specimen was cut to a size of 30 mm and put on a lathe to be drilled 1 mm deep. The hardness testing employed the Brinell hardness test method. The hardness testing process was followed by microstructure observation and SEM-EDAX testing. Findings: The highest hardness was 110.77 HRB by coated at 155 A and it contained many reinforcing inclusions and larger Cr. The lowest current of 140 A had many porosity holes and partially-melted particles, causing Cr grains did not attach perfectly. The current with 170 A had few inclusions and hence a decrease in hardness and at 180 A consisted of a low carbon content and evenly distributed inclusions and Cr and relatively large grain size, and thus the hardness rose. Research limitations/implications: The material of steel rod ST 42 coated by chrome steel. Practical implications: The variation of current should be prepared wisely in term because it will effect the hardness, surface roughness and microstucture. This research can be improved by varying the voltage, gas pressure, particle velocity, particle temperature, and molten wire width. Originality/value: Simple route of making steel rod ST 42 coated by chrome steel using wire arc spray coating and also the investigation of hardness, surface roughness and microstucture in steel rod ST 42 coated by chrome as the result.

scholarly journals Calibration Of Vickers Hardness Test PT.Tenaris Seamless Pipe Indonesia Jaya Cilegon Using Standar Blok

2020 ◽  
Vol 64 (3) ◽  
pp. 81-87
Author(s):  
Dodi Dodi Sofyan Arief ◽  
◽  
Muftil Badri ◽  
M Dalil ◽  
Agus Reforiandi ◽  
...  
Keyword(s):  
Vickers Hardness ◽  
Testing Machine ◽  
Hardness Test ◽  
International Standards ◽  
Measuring Instruments ◽  
Test Machine ◽  
Hardness Testing ◽  
Diamond Pyramid ◽  
Vickers Hardness Test

A calibration is an activity to determine the conventional validity of the appointment value of measuring instruments and measuring materials by comparing them to standard measurements that are traceable to national and international standards for measurement units and or international and certified reference materials. The calibration is generally a process of adjusting the output or indication of a measurement device to match the magnitude of the standard used in certain accuracy. The purpose of this paper is to find out the vickers hardness test calibration whether the machine running normally or there is a problem with the device. A case study was conducted in PT. Tenaris SPIJ, Cilegon, Indonesia. A vickers hardness testing in the case study has its own reference standard, namely ISO 6507-2: 2018 Metal material - Hardness Test Verification and Calibration of the test machine. The vickers hardness test equipment is a machine to conduct tests using a diamond pyramid with a plane angle of 136°, by means of an emphasis by an indentor that results in a trace or indentation on the surface of the test object. The vickers hardness testing is abbreviated as HV or HVN and also known as Diamond Pyramid Hardness Test (DPH). Result of calibration in the case study was found the repeatability value on vickers hardness testing machine of 32 HV 10 and the error value of ±3%.

scholarly journals Uncertainty calculations and calibration of metal hardness testing equipment

2019 ◽  
Author(s):  
S. Kaan Gürel ◽  
İ.Ahmet Yüksel ◽  
T .Oytun Kılınç
Keyword(s):  
Hardness Test ◽  
Test System ◽  
Vital Role ◽  
National Metrology Institute ◽  
Ground Vehicles ◽  
Hardness Testing ◽  
Hardness Tests ◽  
Calibration Methods ◽  
Accredited Laboratory ◽  
Metal Hardness

Hardness tests have vital role for industries such as aerospace, ground vehicles and energy. In these industries, companies do not have only their internal processes but also sub-contractors. Therefore, for acceptance tests, hardness testing becomes so convenient way in order to confirm conformance of incoming materials to the facility. Additionally, there are also critical test limits that comes from technology transfer projects. In these type of projects, specification limits can be very narrow and design of parts may not be changed and quality (non-conformance) decisions may not be taken as rework or used as. In case of probable failure, material parts could cause catastrophic results in mentioned industries. In this study, hardness test capability of a Vickers Hardness Machine is investigated by use of direct and indirect calibration methods. Uncertainty calculations are made for Vickers test system. While making calibration of hardness test machines, the parts which are components of hardness scales shall be also calibrated / verified. These components must be in necessary tolerances related to EN/ISO specifications. After that, calibration of these hardness test machines are made by use of hardness reference blocks that are produced and calibrated by national metrology institute or an accredited laboratory.

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