With this arrangement, the long axis of the test specimen will coincide with the direction of the applied pull through the center line of the grip assembly. Note 4 — Reinforcements of plastics with glass fiber offer wide opportunities for designing and producing products with markedly different responses to loading even when the basic geometry of the product is similar. Stressstrain data at several levels of temperature, humidity, time, or other variables may be needed to furnish reasonably accurate indications of the behavior of the material. It does, however, roughly describe the average rate at which most of the stress carried by the test specimen is applied and for that portion of the stress-strain curve in which principal stressing occurs. Such applications require more suitable tests, such as impact, creep, and fatigue.
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A superscript epsilon e indicates an editorial change since the last revision or reapproval. It is desirable, but not essential, that this instrument automatically record this distance or any change in it as a function of the load on the satm specimen or of the elapsed time from the start of the test, or both.
The speed of testing shall be either: This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? A number in parentheses indicates the year of last reapproval. It will frequently be necessary to 21055 this function daily.
Report the percentage elongation to two signi? For referee tests, the resolution of discrepancies must be resolved between the purchaser and the seller.
ASTM D2105 – 01(2014)
It is affected by the elasticity of the materials being tested but is fairly accurately determined by the method described.
Specimens shall be carried to failure.
Current edition approved March 1, Materials possessing a low order of ductility may not exhibit a yield point. Link to Active This link will always route to the current Active version of the standard.
This practice assumes that ast, thermogravimetry involved in the practice is proper. Materials possessing a low order of ductility may not exhibit a yield point.
NOTE 1—For the purposes of this standard, polymer does not include natural polymer. NOTE 3—It is realized that the method of preparation of a material is one of the many variables that affect the results obtained in testing a material. The evolved gas analysis performed with an STA instrument 5 is similar to that with a TGA, and so, would be covered by this practice. The test specimen shall be held in such a way that slippage relative to the grips is prevented insofar as possible.
It can, if desired, be determined more precisely by calculation from load-time data, recorded especially for the purpose during a test.
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Larger sizes may be tested if required apparatus is available. Hence, when comparative tests of materials per se are desired, the greatest 215 must be exercised to ensure that all samples are prepared in exactly the same way; similarly, for referee or comparative tests of any given series of specimens, care must be taken to secure the maximum degree of uniformity in details of preparation, treatment, and handling.
Hence, where directly comparable results are desired, all samples should be of equal thickness and outside diameter. This type of instrument is sometimes called a simultaneous thermal analyzer STA.
ASTM D E R_百度文库
21005 a constant is useful if its arbitrary nature and dependence on time, temperature, and similar factors are realized. Record the load carried by the specimen when the strain reaches 0. Precision and Bias Individual reprints single or multiple copies of this standard astmm be obtained by contacting ASTM at the above address or at phonefaxor service astm.
NOTE 4—Reinforcements of plastics with glass? No other units of measurement are included in this standard. It is not the intention of this practice to instruct the user on proper thermogravimetric techniques.
In the case of pipe for general field use, internal pressure, as well as loads in tension, compression, torsion, and flexure must be resisted to some degree. The tests cannot be considered signi? This standard has been approved for use by agencies of the Department of Defense. Hence, when comparative tests of materials per se are desired, the greatest care must be exercised to ensure that all samples are prepared in exactly the same way; similarly, for referee or comparative tests of any given series of specimens, care must be taken to secure the maximum degree of uniformity in details of preparation, treatment, and handling.