A Study on the Ball Indentation Test for Linear Hardening Metals

2017 ◽  
Author(s):  
Tairui Zhang ◽  
Weiqiang Wang ◽  
Aiju Li
Keyword(s):  
Elastic Modulus ◽  
Indentation Test ◽  
Austenitic Stainless Steels ◽  
Empirical Method ◽  
Average Error ◽  
Uniaxial Tensile ◽  
Linear Hardening ◽  
Hardening Behavior ◽  
Ball Indentation ◽  
Ball Indentation Test

In this work, a numerical analysis based on the linear hardening model and ball indentation test was proposed to determine the properties of materials such as austenitic stainless steels that obey linear hardening behavior. Experiments on 304 and 321 austenitic stainless steel showed that the numerical method provides yield and tensile strength values with a maximum error of less than 5% and the hardening behavior identical with uniaxial tensile tests, while the average error for yield strength was more than 30% with the empirical method. The reasons why the empirical method produces larger errors for non-power law materials were analyzed in detail. The elastic modulus calculation method was also re-investigated, and the model based on re-loading showed much bigger equivalent contact diameters and provided more accurate elastic modulus values in a simple way.

Ball-indentation test technique for evaluating thermal and creep damage of modified 9Cr-1Mo steel

2010 ◽  
Vol 63 (2-3) ◽  
pp. 431-436 ◽  
Author(s):  
V. Karthik ◽  
K. Laha ◽  
K. S. Chandravathi ◽  
P. Parameswaran ◽  
K. V. Kasiviswanathan ◽  
...  
Keyword(s):  
Indentation Test ◽  
Creep Damage ◽  
Test Technique ◽  
Ball Indentation ◽  
Ball Indentation Test

Evaluation of Local Tensile Properties of Bi-Metallic Weld Joints by Small Tensile and Ball Indentation Tests

2007 ◽  
Vol 353-358 ◽  
pp. 2073-2076
Author(s):  
Jin Won Kim ◽  
Jong Sun Park ◽  
Jong Sung Kim ◽  
Tae Eun Jin
Keyword(s):  
Weld Metal ◽  
Tensile Properties ◽  
Ferritic Steel ◽  
Indentation Test ◽  
Ultimate Tensile Stress ◽  
Base Metals ◽  
Weld Joints ◽  
Ball Indentation ◽  
Indentation Tests ◽  
Ball Indentation Test

This study performed tensile test using small-size flat specimen and ball indentation test at room temperature to characterize the local tensile properties of bi-metallic weld joints. The weld specimens used were fabricated by joining between SA508 Gr.3 ferritic steel and Type 316 stainless steel with Alloy 82 buttering on the ferritic steel side and Alloy 82/182 weld metal. The test results showed that yield stress (YS) of weld metal was slightly higher than that of Type 316 and smaller than that of SA508 Gr.3, and ultimate tensile stress (UTS) of weld metal was similar as those of Type 316 and SA508 Gr.3 base metals. Also, the values of YS and UTS of buttering layer (Alloy 82) were nearly same as those of weld metal. Heat-affected-zones (HAZs) showed higher YS and UTS values compared to their base metals. Especially, the strengths of SA508 Gr.3 were significantly higher than those of surrounding materials. Also, it was known that the ball indentation test reasonably measured the local YS and UTS of bi-metallic weld joints.

In-Situ Damage Evaluation Using Ball Indentation Test Method

2010 ◽  
Author(s):  
Raghu V. Prakash
Keyword(s):  
True Strain ◽  
Base Material ◽  
Indentation Test ◽  
Test Method ◽  
Fatigue Properties ◽  
Invasive Test ◽  
Ball Indentation ◽  
Loading And Unloading ◽  
Ball Indentation Test

Automated ball indentation is a semi-invasive test method that is gaining importance as a field test method in the recent times. Based on the few cycles of loading and unloading, and corresponding load, deflection characteristics, it is possible to estimate the true stress-true strain information of a material. In the present work, ball indentation has been used to evaluate the static and fatigue properties of base material as well as material subjected to different types of damage, such as fatigue, weldment etc. The tensile properties and fatigue properties were found to be affected by the prior damage history.

Testing Techniques for Mechanical Characterization of Nanostructured Materials

2003 ◽  
Vol 791 ◽  
Author(s):  
Carl C. Koch ◽  
Ronald O. Scattergood ◽  
K. Linga Murty ◽  
Ramesh K. Guduru ◽  
Gopinath Trichy ◽  
...  
Keyword(s):  
Indentation Test ◽  
Small Sample ◽  
Small Samples ◽  
Punch Test ◽  
Ball Indentation ◽  
Shear Punch Test ◽  
Testing Techniques ◽  
Ball Indentation Test ◽  
Small Sample Sizes

ABSTRACTTesting methods are reviewed that can be applied to the small sample sizes which result from many of the processing routes for preparation of nanocrystalline materials. These include the measurement of elastic properties on small samples; hardness, with emphasis on nanoindentation methods; the miniaturized disk bend test (MDBT); the automated ball indentation test (ABI); the shear punch test; and the use of subsize compression and tensile samples.

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