b) by keeping the drop hammer mass constant and varying the area of square cushions from 18 x 18 cm to 8 x 8 cm.
the area of the block less the area of the void) using a constant drop hammer mass.
A flash gun was mounted to project light on to the scribed face where the flash trigger was installed such that one contact was attached to the drop hammer and the other on an adjustable arm positioned vertically below the hammer contact.
After the system was set for the required bulk compression and drop height, the lights were turned off in the test room, the camera shutter opened, drop hammer released (triggering the flash at the required compression), and the camera shutter closed before reilluminating the room.
The effect of altering static loading by either changing drop hammer mass (using 15 x 15 cm samples) or varying sample areas (at constant drop hammer mass) was investigated on 5-cm-thick foam.
The surfaces in contact with the anvil and drop hammer appeared to have been restricted in movement possibly as a result of friction.
This cell, under impact conditions, was bounded by the drop hammer and anvil on the top and bottom surfaces and by four open-cell PU foam walls on the other four sides.
It was assumed that the drop hammer and the anvil prevented air flow from the top and bottom surfaces of the foam, which seems valid considering the deformation mechanisms shown above.
3, the curves generated by changing drop hammer mass were based on a sample size of 15 x 15 x 5 cm, giving an open surface area of 3 x [10.
Eumuco-Verson die-forging presses range in capacity from 700 to 8800 tons, and such presses are "the successor to the drop hammer for high-volume forging accuracy.
Steam-operated drop hammers and skilled workmen still produce top-quality forgings without aid of computer or automation.