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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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. If the testing is part of a designed experiment, other sampling techniques may be used if described in the test plan. Strains of less than 0.
Weigh the specimen to the nearest milligram 0. A non-standard DMA Tg de? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? D Terminology for Plastics: 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.
Before the transition the storage modulus continues to slope downward and after the transition the storage modulus continues to slope downward. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. For comparison purposes the peak temperature of the tangent delta curve Tt is identi?
ASTM D7028 – 07(2015)
The same heating rate shall be used for all samples whose results are to be compared. Specimen absolute size is not?
The temperature calibration points must span the DMA Tg result.
The temperature at which a signi? The two tangent lines are intersected, and temperature corresponding to this intersection point is recorded as the DMA Tg.
The second tangent line Line B, Fig. Typically the thermocouple should be as close to the sample as possible. 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.
Determination and Report of Procedures. For some types of dynamic mechanical analyzers, a purge gas? This could indicate that aastm sample was taken from a defective portion of the laminate. Link to Active This link will always route to the current Active version of the standard.
Therefore, it is recommended that the test specimens should be weighed before and after DMA Tg testing to quantify the moisture change in the specimen resulting from the DMA Tg test. Referenced Documents purchase separately D70288 documents listed below are referenced within the subject standard but are not provided as part of the standard. Measure the specimen length to 0. A non-standard specimen con?
Record any visual anomalies observed. In awtm, 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 a different DMA Tg that may be either higher or lower than the standard.
Weigh the specimen after the test to awtm nearest milligram 0. The span-to-depth ratio, ply orientation, and ply stacking sequence of a specimen with respect to the testing?
Depending on the analyzer, typical specimen size can range from 56 6 4 3 12 6 1 3 2. Interpretation of Results Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The DMA Tg is determined to be the intersection of two tangent lines from the x7028 modulus by this test method.
Any deviations from this heating rate shall astk noted in the report and the result shall be reported as non-standard. Historical Version s – view previous versions of standard. Sampling and Test Specimens 8. 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 conditions shall be used for both calibration and ashm runs. A new or spare specimen shall be prepared from the same material package and tested to replace any specimens rejected per this paragraph.