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Abstract

A brief review is given of the early methods used for the load verification of material-testing machines. Demands for greater accuracy led to the development of elastic proving devices, followed by deadweight standards of sufficient accuracy to calibrate these devices. The methods resulting from these developments are also described. The definition of the technical unit of force is given, followed by a consideration of the minimum accuracies required of deadweight standards, proving devices and testing machines verified by proving devices. These considerations of accuracy bear particular reference to the British Standard covering the load verification of testing machines.

A deadweight standard machine and many of the more common types of proving devices are briefly described. General guidance is given of the range of loads covered and the performance which may be expected of the various types of proving devices.

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References

British Standard 1610 (Part 1:1958), Verification of Testing Machines.

British Standard 350 (Part 1:1959), Conversion Factors and Tables.

Pollard

H. V.

Hitchcock

R. G.

1954 Engineering, vol. 177, (4602), April 9th, pp. 468–9, ‘The British Five-Ton Deadweight Standard of Load’.

Phillips

C. E.

1948 Proceedings of the Seventh International Congress for Applied Mechanics, vol. 4, p. 268, ‘The British 50 ton Dead Weight Standard of Load installed at the National Physical Laboratory, Teddington.’.

Aughtie

1952 Proceedings of a Symposium held at the National Physical Laboratory on 21st and 22nd May, 1951, p. 7, ‘The Primary Load Standard. Recent Developments and Techniques in the Maintenance of Standards’ (H.M.S.O., London).

Petrenko

S. N.

1926 Trans. Am. Soc. Steel Treating, C.22, p. 420, ‘Elastic ring for verification of Brinell hardness testing machines’.

Wilson

B. L.

Tate

D. R.

Borkowski

1946 Circular of the National Bureau of Standards, C.454, ‘Proving Rings for Calibrating Testing Machines’ (U.S. Government Printing Office, Washington).

British Patent Application No. 36249/58, Ring Mounted Proving Ring.

Measurement of Load by Elastic Devices, National Physical Laboratory Notes on Applied Science No. 21, H.M.S.O., London, 1961.

Methods of Load Verification of Tension and Compression Testing Machines

Abstract

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References