A shear punch test is a very useful small specimen test method for evaluating the mechanical properties of in-service components, in view of the requirements of small size sample material. Typically disks of nominal size 10 mm diameter, having a thickness of 0.5 mm or less is used to extract the tensile properties through measurement of load-displacement responses. This paper presents the results of shear punch tests on pressure vessel steels and its correlation with yield stress and ultimate tensile stress obtained using ASTM standard specimens. Small punch test is similar to shear punch test, except that the indenter is spherical in shape, and as a consequence the material under the punch will be subjected to biaxial state of stress. The tensile response of materials derived by small punch test is correlated with standard tensile tests. Copyright © 2012 by ASME.

Raghu V. Prakash

Department of Mechanical Engineering

LOAD-DISPLACEMENT RESPONSE

PRESSURE VESSEL STEELS

SHEAR-PUNCH TESTS

SMALL PUNCH TEST

Small size samples

STATE OF STRESS

TENSILE RESPONSE

ULTIMATE TENSILE STRESS

Mechanical engineering

Mechanical properties

Tensile testing

Testing

Pressure vessels

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Correlation of Tensile Properties of Pressure Vessel Steels by Shear Punch and Small Punch Test Methods

ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

Fatigue properties of materials is an important input while estimating the residual life of critical components. Fatigue data (stress vs. cycles or strain vs. cycles or fatigue crack growth rate data) are used to predict the residual life. One of the shortcomings of this method is that it relies on data generated from virgin material or surveilance coupons which have been exposed to the harsh environment over a period of time. Often the quantity of material available for fatigue data is small and being probabilistic in nature, fatigue data requires multiple specimens to be tested at any given stress/strain levels. This has prompted us to develop test procedures to determine the fatigue data of materials from small volume of material. In this paper, we present the results of cyclic ball indentation test method as well as cyclic small punch test method that is used to generate the fatigue data at different stress levels. There are several fine details relating to these test technique - viz., establishing a equivalent damage criteria for failure life with standard LCF/HCF test specimens. Apart from this, several variables that influence the testing process needs to be considered. This paper briefly reviews the viability of using miniature specimen test techniques, particularly cyclic ball indentation and cyclic small punch testing for extracting the fatigue data, based on the author's previous work. It is shown that, both the test techniques are capable of detecting and quantifying the prior fatigue damage in the materials. Copyright © 2015 by ASME.

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

Evaluation of fatigue data through miniature specimen test techniques

Small specimen testing has become popular in the recent times, due to the need for material property evaluation using limited volume samples available from processing techniques, scoop extraction of materials. There are several methods of direct and in-direct mechanical property evaluation such as: automated ball indentation, miniature tensile testing, small punch testing, shear punch testing and miniature specimen impact testing. Most of these techniques provide a correlation with standard specimen test data through empirical relationships. This paper summarizes work done at the author's Institution during the last decade on small specimen testing, with specific reference to spherical ball indentation (both static as well as cyclic indentation), shear punch and small punch testing on a number of metallic materials. Specific examples of how the material degradation due to prior damage (plastic deformation, fatigue, creep) are discussed. Copyright © 2014 by ASME.

A decade of experience with small specimen testing to evaluate mechanical properties of materials

Journal of Nuclear Materials

Tensile–shear correlations obtained from shear punch test technique using a modified experimental approach

Materials Science and Engineering: A

Evaluation of mechanical properties using shear–punch testing

Metallurgical Transactions A

Review of small specimen test techniques for irradiation testing

Shear punch tests for mechanical property measurements in TEM disc-sized specimens

The development of a miniaturized disk bend test for the determination of postirradiation mechanical properties

Correlation of tensile properties of pressure vessel steels by shear punch and small punch test methods

Journal	ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Open Access	No