Dropweight sample tester

Details Dropweight sample tester Dropweight sample tester

1976-09-22

1978-04-25

Gill, James J.

Measuring and testing

Surface and cutting edge testing

Roughness

73 12, G01N 330

Patent

active

040856097

ABSTRACT:
This invention provides a process and apparatus for determining the energy absorbed by a test-piece of material during its fracture. The test-piece is supported horizontally between two separated anvils, and a dropweight is released from a position above the test-piece so that the same can be struck and fractured. Means are provided for determining, by measuring a determining characteristic of the motion of the dropweight after the test-piece has been fractured, the theoretical height from which the dropweight would have had to be released in order to have that post-fracture motion if the test-piece had not been in the way. The difference between this calculated theoretical height and the actual height of release, multiplied by the weight of the dropweight, provides a measure of the energy absorbed by the test-piece during its fracture.

REFERENCES:
patent: 2778219 (1957-01-01), Wachter
patent: 3285060 (1966-11-01), Pessen
patent: 3538743 (1970-11-01), Glidden
Journal of Applied Physics, Equipment to Measure the Energy Absorption of Films at High Strain Rates, vol. 28, #3, Mar., 1957, Spangler et al.

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