Estimation of Tensile Properties of Engineering Alloys Using Indentation Technique
Date Issued
2007
Date
2007
Author(s)
Cheng, Shao-Chiu
DOI
zh-TW
Abstract
Mechanical equipments in the Industry often endure from various depredation mechanism, resulting in cracks and fractures. Therefore, it is necessary to test the solidity of mechanical properties of structures and its residual life. In order to test the subjects, we have to know the relevant mechanical properties of material first. The data of structure solidity and residual life can’t be obtained from theoretical calculation. They are often collected by doing destructive or non-destructive examinations. Although destructive examinations can offer more detail than non-destructive ones, the drawbacks of destructive without affecting the solidity of the whole structure. Thus, these samples must be small enough to avoid damages on the structure, which makes developing small specimen technology crucial and necessary.
This research includes performing Ball Indentation Test on machines from several classifications of testing materials, increasing feasibility of wide range of materials, comparing the data from Ball Indentation Test to general mechanical examinations, and obtaining the mechanical properties of the unknown materials by applying appropriate experimental formulas. This research mainly focuses on materials like carbon-steel, Ti-alloy, Al-alloy and the metal of powder metallurgy. In addition, material factor and true-stress/true plastic strain curve mentioned in literatures are discussed.
Therefore, the design of the Indentation Test machine has several advantages, such as smaller size of samplings and elimination of the surface process of material. Most importantly, we can shorten/decrease the time of experiment. In conclusion, Ball Indentation Test is potential, simple, and suitable for on-site measurement of non-fractural/destructive examination.
Subjects
壓痕法
拉伸曲線
機械性質
非破壞性檢測
降服強度
拉伸性質
Indentation test
patial unloading
Tensile property
in-situ measurement
Non-destructive testing
yield strength
Type
thesis
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