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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Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. A change in heating rate will affect the glass transition temperature result; the standard heating rate is the best available compromise for comparing DMA Tg results of dry and wet laminates.

D Terminology for Plastics: The span-to-depth ratio, ply orientation, awtm ply stacking sequence of a specimen with respect to the testing? This standard is subject to revision xstm any time by the responsible technical committee and must be reviewed every?

A span-to-thickness ratio greater than ten is recommended. A new or spare specimen shall be prepared from the same material package and tested to replace any specimens rejected per this paragraph. Other materials, such as neat resin, may require non-standard deviations from this test method to achieve meaningful results.

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Measure the specimen length to 0.

ASTM D用DMA测试Tg_百度文库

In general, for a given material, a higher testing frequency produces a higher DMA Adtm value than this standard, while use of the resonance mode will yield a different DMA Tg that may be either higher or lower than the standard. Sampling and Test Specimens 8.

Work Item s – proposed revisions of this standard. Examples are shown in this appendix to provide graphical illustrations of how to select the two tangent lines. Instrumentation manufacturer recommendations should be followed. D — 07? For example, a linear plot scale will result in a lower value of DMA Tg.

See Appendix X1 for additional guidelines to draw tangent lines. The two tangent lines are intersected, and temperature corresponding to this intersection point is recorded as the DMA Tg. NOTE 2—Guides EEand E contain data reporting recommendations for asfm materials and composite materials mechanical testing.

A meaningful comparison of data requires that the specimen con?

ASTM D7028 – 07(2015)

Current edition approved Dec. It is ideal because the glass transition is clearly displayed. 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.

The second tangent line Line B, Fig. It is possible that more than one transition exists, but this should be con? The same conditions shall be used for both calibration and testing runs. Weigh the specimen to the nearest milligram 0. ASTM E Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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Laminate edges or other irregularities created in the laminate by mold or bagging techniques should be avoided. For comparison purposes the peak temperature of the tangent delta curve Tt is identi?

If the two tangent lines are constructed from temperatures too close to the transition, the intersection is depicted as shown in Fig. Mount the specimen in dual cantilever mode or three-point bending mode. 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.

Record any visual anomalies observed.

The equipment must be calibrated in the same loading mode as will be used for testing, either dual cantilever or three-point bending. Typically the thermocouple should be as close to the sample as possible.