Rail test

Guide Rail Tests, 1967-1968, Dept, of Highways of Ontario, Report No. RR157, Mar. 1970. 

Modified rail test See Torque strength Disk shear in compression Bond strength in compressive shear... 

ASTM D4027-98 Standard practice for measuring shear properties of structural adhesives by the modified-rail test. 

Measuring Shear Properties of Structural Adhesives by the Modified-Rail Test, Practice for (D 4027) ... 

Measuring Sttength and Shear Modulus of Nonrigid Adhesives by the Thick Adherend Tensile Lap Specimen, Practice for (D 3983) Measuring Shear Properties of Structural Adhesives by the Modified-Rail Test, Practice for (D 4027)... 

Properties of Structural Adhesives by the Modified-Rail Test. 

The procedure approved by Gosstandart may have status of state standard, for example, GOST Non-destructive Testing. Ultrasonic Testing of rails , where types of devices, probes, procedure of the instrument adjustment are specified. Such kind of procedure may be used on site. 

GOST 18576-85 Non-destructive Testing. Ultrasonic Testing of rails... 

Because the ore quaUty is variable, large open-pit mining areas are first identified by general exploration specific mining strips are later identified by further exploration and testing. Surface mining methods are used. The overburden is drilled, blasted, and removed, and the waste from a given strip is dumped into a previously worked-out strip. After removal of the overburden, the exposed caUche is drilled, blasted, and loaded into 80-metric ton tmcks that dehver the ore to a transfer rail station for transportation to the plants. 

Another test protocol is that specified by the International Safe Transit Association (ISTA), East Lansing, Michigan. This also simulates transportation and handhng conditions. Transportation companies—truck, rail—accept ISTA test results and will transport packages bearing the ISTA marks. 

J. M. itney, D. L. Stansbarger, and H. B. Howell, Analysis of the Rail Shear Test - Applications and Limitations, Journal of Composite Materials, January 1971, pp. 24-34. 

Rail continuity bonds and negative feeders should be regularly inspected and tested, and the insulation to earth of the third rail or overhead catenary wires and the running (return) rails maintained satisfactorily. Track maintenance should include the renewal of sleepers and rail bedding material if necessary. 

In the testing of demolition expls, eg, those intended for the destruction of rails, various charges can be detonated against an exptl rail until the minimum amount of charge required is established... 

Tests showed that above a critical volume, bulk containers of trichloronitromethane can be shocked into detonation. Containers below 700 kg content will now be the maximum size as against rail-tanks previously used. 

In general, most converters are tested on the bench with the electronic load set to constant current (CC mode). True, that s not benign, nor as malignant as it gets. But the implied expectation is that converters should at least work in CC mode. They should, in particular, have no startup issues with this type of load profile. But even that may not be the end of the story Some loads can also vary with time. For example, an incandescent bulb has a resistive profile, but its cold resistance is much lower than its hot resistance. That s why most bulbs fail towards the end of their natural lifetime just when you throw the wall switch to its ON position. And if the converter is powering a system board characterized by sudden variations in its instantaneous supply current demand, that can cause severe problems to the converter, too. The best known example of this is an AC-DC power supply inside a computer. The 12V rail goes to the hard disk, which can suddenly demand very high currents as it spins up, and then lapse back equally suddenly into a lower current mode. 

A full functional wet test of the deluge system is normally accomplished. This test ensures coverage and density patterns are being achieved. A calculated collection pan can be provided during the testing to confirm the density rate per minute. The mechanism to activate the deluge should be tested under conditions that will simulate as real as can be reasonably obtained. Where equipment to be protected is not normally in place, i.e., ships, trucks or rail cars, the test should not be conducted until they are in their normal position during operations. 

Apart from the short beam shear test, which measures the interlaminar shear properties, many different specimen geometry and loading configurations are available in the literature for the translaminar or in-plane strength measurements. These include the losipescu shear test, the 45°]5 tensile test, the [10°] off-axis tensile test, the rail-shear tests, the cross-beam sandwich test and the thin-walled tube torsion test. Since the state of shear stress in the test areas of the specimens is seldom pure or uniform in most of these techniques, the results obtained are likely to be inconsistent. In addition to the above shear tests, the transverse tension test is another simple popular method to assess the bond quality of bulk composites. Some of these methods are more widely used than others due to their simplicity in specimen preparation and data reduction methodology. 

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