Small Punch Testing - The Transition from a Code of Practice to a European Testing Standard

2017 ◽  
Vol 734 ◽  
pp. 3-22 ◽  
Author(s):  
Karel Matocha ◽  
Roger Hurst
Keyword(s):  
Mechanical Properties ◽  
Test Method ◽  
Metallic Materials ◽  
Small Punch Test ◽  
Test Technique ◽  
Small Punch ◽  
Code Of Practice ◽  
Punch Test ◽  
Early Results ◽  
Miniature Testing

The development and practical use of the Small Punch test technique for the evaluation of mechanical properties of metallic materials in Europe resulted in the publication of the CEN document CWA 15627 Small Punch Test Method for Metallic Materials in 2007. The evaluation of the actual mechanical properties of metallic materials from the results of such tests according to CWA 15627 were presented at the first three International conferences SSTT "Determination of Mechanical Properties by Small Punch and other Miniature Testing Techniques" held in Ostrava (2010, 2012) and Castle Seggau in Austria (2014). In the present paper the motivation and the steps taken to lead to the setting up of a working group and programme facilitating the transformation of CWA 15627 Small Punch Test Method for Metallic Materials into an EN standard are summarized along with early results of the programme.

Determination of Mechanical Properties of Metallic Materials from Very Small Volumes by Means of Small Punch Test

2017 ◽  
Vol 741 ◽  
pp. 116-121
Author(s):  
Petr Dymáček ◽  
Ferdinand Dobeš ◽  
Luboš Kloc
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Metallic Materials ◽  
Small Punch Test ◽  
Test Setup ◽  
Small Punch ◽  
Punch Test ◽  
Static Fracture

The paper summarizes capabilities of the small punch tests on miniature disc specimens from metallic materials. Results obtained by small punch tests can be correlated with mechanical properties determined by conventional or other miniature tests. Three basic types of small punch test setup: i) static/fracture, ii) creep and iii) stress relaxation are described and the basic quantities that can be obtained are shown. Relations for an assessment of conventional mechanical properties from quantities obtained by small punch test are presented.

Computational Simulation of Small Punch Test

2012 ◽  
Vol 232 ◽  
pp. 497-501
Author(s):  
Jindřich Petruška ◽  
Jiří Hůlka ◽  
Kubik Petr
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Computational Simulation ◽  
Testing Procedure ◽  
Penetration Test ◽  
Small Punch Test ◽  
Small Punch ◽  
Code Of Practice ◽  
Punch Test ◽  
Basic Evaluation

The paper deals with numerical simulation of Small Punch Test (SPT). SPT is a penetration test used to determine basic mechanical properties from a tiny piece of material. The testing procedure drew a great interest in the last decade, nevertheless there are no generally accepted standards for this type of testing until now. “Code of Practice” was created as a consequence of the CEN Workshop 2007, recommending both geometry, experiment performance and its basic evaluation. To obtain other mechanical properties like flow curve, yield stress, ductility and ultimate strength, it is necessary to realize a numerical simulation of the test to identify the mentioned material parameters. As the SPT results are generally influenced by many other parameters besides material behaviour, we try to quantify their relevance to make the material identification more rigorous.

scholarly journals A Renaissance in the Use of the Small Punch Testing Technique

2015 ◽  
Author(s):  
Roger C. Hurst ◽  
Karel Matocha
Keyword(s):  
Industrial Applications ◽  
Test Method ◽  
Research Progress ◽  
Small Punch Test ◽  
Test Technique ◽  
Small Punch ◽  
Punch Test ◽  
Test Methodology ◽  
Plant Remains ◽  
Testing Techniques

The underlying purpose of this paper is to evaluate whether the CEN CWA 15627 “Small Punch Test Method for Metallic Materials” first published in 2006 has indeed succeeded in providing a stimulus for a wider implementation of the small punch test technique in industrial applications throughout Europe and indeed worldwide. A wealth of research progress has been apparent, as strongly evidenced in three dedicated SSTT (Small Specimen Testing Techniques) conferences held in Europe over the last five years, but also in the wider literature. In particular it is important to mention the recent publication of a Japanese standard and the announcement of parallel progress in China. The present paper concentrates on progress within Europe from the launch of the Code to the present day. In particular attention is focused on the need for industrial acceptance of the test methodology and methods for evaluating the results. Some scepticism still seems to prevail within sectors of the conventional power generation industry, an industry which can potentially benefit most from successful remanent lifetime extension tools of which small punch testing can be considered as a prime candidate. In spite of this, it is demonstrated that a major proportion of the Small Punch testing research of the last decade has been carried out on power plant steels. Meanwhile it is shown that there is evidence that the original remit of the methodology in assessing the integrity of irradiated nuclear plant remains active, new interest is developing for aerospace and next generation nuclear applications enhancing further the credibility of the Code.

Estimation of the mechanical properties of metallic materials by means of the small punch test

2014 ◽  
Vol 582 ◽  
pp. 708-717 ◽  
Author(s):  
T.E. García ◽  
C. Rodríguez ◽  
F.J. Belzunce ◽  
C. Suárez
Keyword(s):  
Mechanical Properties ◽  
Metallic Materials ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Application of Small Punch Test to Evaluate Tensile Properties of SA213T22 Grade Boiler Steel

2015 ◽  
Vol 830-831 ◽  
pp. 191-194
Author(s):  
M. Venkateswara Rao
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Properties ◽  
Test Methods ◽  
Uniaxial Tensile ◽  
Test Results ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Aging Phenomena

Conventional tensile test methods are used for service exposed high temperature boiler tubes to evaluate the deterioration in mechanical properties such as tensile strength, yield strength and percentage elongation. The mechanical properties are required to be evaluated periodically as the boiler components undergo material degradation due to aging phenomena. The aging phenomena occurs due to continuous exposure of tubes to high temperature & pressure steam prevailing inside the tubes and high temperature exposure to corrosive combustible gases from the external surfaces within the boiler.A recent developed new technique called small punch testing has been used to evaluate the tensile properties of SA 213T22 grade steel predominantly exists in super-heater and re-heater sections of boiler. The small punch tests have been carried out on the miniature disk shaped specimens of diameter of 8.0 mm and 0.5 mm thickness extracted from both the new and service exposed tubes. Conventional uniaxial tensile tests on standard specimens from the same tube material have also been performed for comparison. The service exposed tubes showed considerable loss in mechanical properties in both the conventional and small punch test results. Correlations of tensile properties have been obtained based on the comparative analysis of both small punch and uniaxial tensile test results. Further, the study showed that an appropriate empirical relation could be generated for new and service exposed materials between both the techniques. Conventional test methods require large quantity of material removal for test samples from in-service components whereas small punch test method needs only a miniature sample extraction. This small punch test technique could also be extended to evaluate the thicker section boiler components such as pipelines and headers in the boiler as a part of remaining life assessment study. Also this technique could be a useful tool to any metallic component where large quantity of sample removal may be difficult or may not be feasible.

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