ASTM D7028 PDF

Add Attachments to Content Item ‘ASTM D Glass Transition Temperature ( DMA Tg) of Polymer Matrix Composites by Dynamic Mechanical Analysis (DMA) . ASTM D Glass Transition Temperature (DMA Tg) of Polymer ASTM D has become a widely used test standard in many companies due to. ASTM D用DMA测试Tg_能源/化工_工程科技_专业资料。Designation: D – 07?1 Standard Test Method for Glass Transition.

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For some types of dynamic mechanical analyzers, a purge gas? Terminology D de?

Determination and Report of Procedures. Measure the specimen length to 0. The equipment must be calibrated in the same loading mode as will be used for testing, either dual cantilever aztm three-point bending. Sampling and Test Specimens 8.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

In this example the transition is less clear than the thermogram of Fig. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. On the other hand, if the two tangent lines are constructed at temperatures too far away from the transition, the intersection is depicted in Fig. It is standard that one of the major? A number in parentheses indicates the year of last reapproval. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Any deviations from this heating rate shall be noted in the report and the result shall be reported as non-standard.

For comparison purposes the peak temperature of the tangent delta curve Tt is identi? Record any visual anomalies observed. D Terminology for Plastics: The second tangent line Line B, Fig.

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The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only. If a non-standard frequency, or the resonance mode, is used, the non-standard approach shall be described in the report and the test result recorded as non-standard.

ASTM D用DMA测试Tg_百度文库

A meaningful comparison of data requires that the specimen con? See Appendix X1 for additional guidelines to draw tangent lines. D Practice for Plastics: The span-to-depth ratio, ply orientation, and ply stacking sequence of a specimen with respect to the testing?

Historical Version s – view previous versions of standard. The DMA Tg value is frequently used to indicate the upper use temperature of composite materials, as well as for quality control of composite materials. Weigh the specimen to the nearest milligram 0. The maximum time between cure lamination and testing shall be 30 days, after which, prior to testing, specimens shall be oven-dried in accordance with It is widely known that heat transfer limitations are more pronounced in DMA apparatus compared to other thermal analysis techniques, such as differential scanning calorimetry DSC and thermomechanical analysis TMA.

A new or spare specimen shall be prepared from the same material package and tested to replace any specimens rejected per this paragraph. It is possible that more than one transition exists, but this should be con? If a different heating rate is used it shall be described in the report and the result recorded as nonstandard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

The same heating rate shall be used for all samples whose results are to be compared.

A non-standard specimen con? For example, a linear plot scale will result in a lower value of DMA Tg.

ASTM D7028 – 07(2015)

A span-to-thickness ratio greater than ten is recommended. This could indicate that the sample was taken from a defective portion of the laminate.

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It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Any deviations from the standard orientation shall be reported and the test results noted as non-standard.

Interpretation of Results Ast edges or other irregularities created in the laminate by mold or bagging d702 should be avoided. Work Item s – proposed revisions of this standard. Test Method E speci? In general, for a given material, a higher testing frequency produces a higher DMA Tg value than this standard, while use of the resonance mode will yield astk different DMA Tg that may be either higher or lower than the standard.

The temperature at which a signi? Table 1 presents the precision statistics generated from this study as de?

Typically the thermocouple should be as close to the sample as possible. If another equipment type or loading mode is used the non-standard approach shall be described in the report and the test result recorded as non-standard.

The peak temperature of the tangent delta curve Tt is identi? This temperature is designated as TB. The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only. Precision and Bias 4 ASTM E These averages allow a relative comparison of the repeatability asm laboratory precision and aetm between laboratory precision of the DMA Tg test parameters. NOTE 2—Guides EEand E contain data reporting recommendations for composite materials and composite materials mechanical testing.

The same conditions shall be used for both calibration and testing asym.