Rotating drum test

This drop test is sometimes run in conjunction with the rotating-drum test, which. may also be considered as a kind of drop test. In this test a drum 14ft in dram, which cairies inside plates or baffles, rotates at 1 rpm. A packing item, such as a box, is placed inside the drum and, as the drum rotates, the item is raised by baffles and then dropped to the bottom of the drum. After each series of 24 falls, the item.is removed and subjected to one fall from a height of 4ft in the drop-test apparatus. These procedures... 

Rolling ball and rotating drum tests, in which the substrate runs on the surface of the adhesive. The measured quantity is the distance traveled or the imposed force, respectively. 

In an attempt to test the surface renewal theory of gas absorption, Danckwerts and Kennedy measured the transient rate of absorption of carbon dioxide into various solutions by means of a rotating drum which carried a film of liquid through the gas. Results so obtained were compared with those for absorption in a packed column and it was shown that exposure times of at least one second were required to give a strict comparison this was longer than could be obtained with the rotating drum. Roberts and Danckwerts therefore used a wetted-wall column to extend the times of contact up to 1.3 s. The column was carefully designed to eliminate entry and exit effects and the formation of ripples. The experimental results and conclusions are reported by Danckwerts, Kennedy, and Roberts110 who showed that they could be used, on the basis of the penetration theory model, to predict the performance of a packed column to within about 10 per cent. 

Drums, rotary (rotating) for testing packing of ammo 5 D1560... 

A loose abrasive powder can be used to impinge on the rubber rather in the manner of a shot blasting machine, or tumbled with the rubber test pieces in a rotating drum. These are logical ways to simulate the action of sand or similar abradants impinging on the rubber in service, as may be the case with conveyor belts or tank linings, but this type of test is not very common. 

The DIN method is given in ISO 464954. The principle of the machine is illustrated in Figure 11.5 a disc test piece in a suitable holder is traversed across a rotating drum covered with a sheet of the abradant, which is why it is also called the rotary drum abrader. In this way, there is a relatively large area of abradant, each part of which is passed over in turn by the test piece, so that wear of the abradant is uniform and relatively slow. In the standard method there is no provision for changing conditions from those specified, other than a lower force for soft rubbers, but it would be possible to use other abradant cloths or papers and to vary the force on the test piece. The degree of slip is 100% and it would be inconvenient to test in the presence of a lubricant. Although not versatile, the method is very convenient and rapid and well suited to quality control. 

In addition, the rotary-platform, double-head abrader is specified for coated fabrics58 and the NBS abrader for shoe soles and heels59. The NBS abrader uses rotating drums with abrasive paper wrapped around them onto which the test pieces are pressed by means of levers and weights, but there is no provision for traversing the test piece across the abradant as in the DIN machine. 

Tiffany, "Physical Testing of Explosives, USBurMines Bull 346 (1931), 60-2 (Detailed description of Mettegang Chronograph) 18)W. Friederich, SS 26, 221-22(1931) (Rotating Drum Chronograph for detg deton vels of expls) 18a)Marshall 3, (1932) 143 46 (Detn of deton vels of expls by Condenser Sound Wave and Photographic methods) 19)T. 

Fig. 9 Descriptive drawing of a rotating drum avalanche test device. This device is commercially available as the TSI Aero-Flow automated powder flowability analyzer. The top pictures the device. The progress of powder avalanche shows the position of the powder in the drum as the drum is rotated and the lower voltage output shows the output of the device during each drum rotation. (From Ref. °. )...

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