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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Examples are shown in this appendix to provide graphical illustrations of how to select the two tangent lines. See Appendix X1 for additional guidelines to draw tangent lines. A span-to-thickness ratio greater than ten is recommended. 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 The equipment must be calibrated in the same loading mode as will be used for testing, either dual cantilever or three-point bending.

It is standard that one of the major?

Any deviations from this heating rate shall be noted in the report and the result shall be reported as non-standard. A meaningful comparison of data requires that the specimen con? Before the transition the storage modulus is relatively constant, the sigmoidal change during transition is clear, and after the transition the storage modulus is relatively constant.

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

It is ideal because the glass transition is clearly displayed. Work Item s – proposed revisions of this standard.

ASTM D用DMA测试Tg_百度文库

Measure the specimen length to 0. In this example the transition is less clear than the thermogram of Fig. Precision and Bias 4 The temperature at which a signi? The materials listed in Table 1 are de? D Practice for Plastics: The span-to-depth ratio, ply orientation, and ply stacking sequence of a specimen with respect to the testing? These averages allow a relative comparison of the repeatability within laboratory precision and reproducibility between laboratory precision of the DMA Tg test parameters.

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If the two tangent lines are constructed from temperatures too close to the transition, the intersection is depicted as shown in Fig. Record any visual anomalies observed. 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 possible that more than one transition exists, but this should be con? ASTM E Instrumentation manufacturer recommendations should be followed.

A non-standard DMA Tg de? Other materials, such as neat resin, may require non-standard deviations from this test method to achieve meaningful results.

This temperature is designated as TB. The second tangent line Line B, Fig. NOTE 2—Guides EEand E contain data reporting recommendations for composite materials and composite materials mechanical testing. Strains of less than 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Other materials, such as neat resin, may require non-standard deviations from this test method to achieve meaningful results. For example, a linear plot scale will result in a lower value of DMA Tg.

A number in parentheses indicates the year of last reapproval. Test Method E speci? This could indicate that the sample was taken from a defective portion of the laminate. If a non-standard d70228, or the resonance mode, is used, the non-standard approach shall be described in the report and the test result recorded as non-standard.

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ASTM D7028 – 07(2015)

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. Summary of Test Method 4. Terminology D de?

A non-standard specimen con? Allow the oven to cool before removing the specimen. This temperature is designated as TA. 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.

Laminate edges or other irregularities created in the laminate by mold or bagging techniques should be avoided. The peak temperature of the tangent delta curve Tt is identi? 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. Generally, the specimen should be centered between the clamp faces and be parallel to the base of the instrument.

D — 07? Link to Active This link will always route to the current Active version of the standard. Opposite surfaces must be essentially parallel and intersecting surfaces perpendicular. Determination and Report of Procedures. 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.