Test chip specimen

The crazing effect can be indirectly determined by testing chip impact resistance of specimens which crack either because of weathering or environmental stress cracking. ... 

The chip impact test is somewhat similar to the Izod impact test. The specimen can be tested using standard Izod pendulum tester. The chip impact test requires the use of a pendulum hammer type of device and a specimen holding fixture. The test specimens are usually 1 in. long x 1/2 in. wide and 0.065 in. thick. The specimens can be prepared either by injection or compression molding or by simply cutting them from a sheet. 

The dimension of the wood-chip concrete specimens was 100x 100x400mm. The three pieces of specimens were made for each test, and the test result was given by the mean of them. 

The suitability of chip form for sub-flooring and flooring applications was also thought worthy of consideration. In this case resistance to impact is of prime importance, for this reason test specimens, as shown in Figure 5, were prepared and impact tests were carried out. 

The OPUS system has dry reagents impregnated in a coated multilayer film chip encased within a plastic bar coded test module. No external or supplementary reagents are required. A serum or plasma specimen is applied to the test module by the instrument and the fluorescence intensity from the module is measured after an assay-specific time interval. 

The pendulum impact test employs a pendulum type of hammer. It is carried out in four ways Izod, Charpy, Chip and Tensile. The apparatus used for the pendulum test consists of a heavy base with a vice for clamping the specimen and a pendulum hammer swinging at a sample. The machine base must be kept on a rigid platform to prevent vibrational energy losses. 

The chip impact test is carried out in a similar way to the Izod test but without a notch. The test specimen is usually 25.4 mm long, 12.7 mm wide, and 1.65 mm thick. The tests are carried out using ASTM D4508 [79]. Because the test involves an un-notched sample, it reflects material toughness rather than the notch sensitivity measured for the Izod and Charpy tests. 

In Germany, the rate of intergranulsu- attack in this solution has been greatly increased by Rocha [75] since 1950. He added zinc dust to precipitate metallic copper and later simply embedded the stainless steel specimens in metallic copper chips or shot. This has the effect of changing the corrosion potential of the test specimen in the less noble direction to that of the metallic copper and thereby reducing the testing time from 200 to less than 48 h. 

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