Method for Uncertainty Determination of Hardness Testing

2002 ◽  
Vol 44 (3) ◽  
pp. 64-71
Author(s):  
Thomas Polzin ◽  
Dieter Schwenk
Keyword(s):  
Hardness Testing ◽  
Uncertainty Determination

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.

Instrumented Indentation Test

2011 ◽  
pp. 167-233
Author(s):  
C. Ullner
Keyword(s):  
Indentation Test ◽  
Indentation Load ◽  
True Stress ◽  
Test Method ◽  
Indentation Hardness ◽  
Instrumented Indentation ◽  
Hardness Testing ◽  
Scope Of Application ◽  
Instrumented Indentation Test

Abstract Instrumented indentation hardness testing significantly expands on the capabilities of traditional hardness testing. It employs high-resolution instrumentation to continuously control and monitor the loads and displacements of an indenter as it is driven into and withdrawn from a material. The scope of application comprises displacements even smaller than 200 nm (nano range) and forces even up to 30 kN . Mechanical properties are derived from the indentation load-displacement data obtained in simple tests. The chapter presents the elements of contact mechanics that are important for the application of the instrumented indentation test. The test method according to the international standard (ISO 14577) is discussed, and this information is supplemented by information about the testing technique and some example applications. The chapter concludes with a discussion on the extensions of the standard that are expected in the future (estimation of the measurement uncertainty and procedures for the determination of true stress-strain curves).

scholarly journals Quantitative uncertainty determination of phase retrieval in RABBITT

2021 ◽  
Author(s):  
Hans Jakob Woerner ◽  
Meng Han ◽  
Saijoscha Heck ◽  
Jia-Bao Ji
Keyword(s):  
Phase Retrieval ◽  
Uncertainty Determination
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