Factors Affecting the Measurement of Strain
| Autor: | L. L. Best |
|---|---|
| Rok vydání: | 1954 |
| Předmět: | |
| Zdroj: | Rubber Chemistry and Technology. 27:223-233 |
| ISSN: | 1943-4804 0035-9475 |
| Popis: | 1. Although alteration of the mixing, vulcanizing, and testing cycle for the measurement of strain does affect the physical properties of the final vulcanizate, a high degree of correlation can be obtained between the results of the rapid test and the normal test. The rapid test, which will not consume any more man-hours than the normal test, can be fitted in to the normal daily procedure with little loss of testing capacity, and provides satisfactory data in a period of three hours for thirty-two test-specimens, whereas more than two days are needed by the normal standard procedure. 2. The mixing, curing, and testing error associated with the measurement by the rapid method is less than that obtained with the normal test method. 3. The rapid method can be used for predicting the results which would be obtained by many physical tests carried out by standard procedures and would, therefore, be generally useful for control measurements in industrial concerns. 4. Isothermal conditioning of the compounded stock after mixing does not appear to reduce the error associated with the rapid test, but does alter the relation between the rapid and normal tests. 5. Immersion of test-specimens in cold water after vulcanization does not improve reproducibility or alter the value of the strain measurement. 6. Molded strain specimens are liable to vary in respect of cross-sectional area. Such variations can produce considerable errors in strain measurements, particularly with rubbers of high strain or low modulus characteristics. A simple method for the correction of these errors is advanced which increases the reproducibility of the strain test. |
| Databáze: | OpenAIRE |
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