Dynamic Mechanical Analysis part 11 pps

... tells us the maximum total force and the maximum from the dynamic stress–strain run tells us the maximum dynamic force. Then, we pick a dynamic force strong enough to give us a strain between 2–12 ... specimens as in the static stress–strain experiment above, run a dynamic stress scan using tension control set to 110 % and a dynamic ramp rate of 95 mN/min. Compare the results with...

Ngày tải lên: 05/08/2014, 09:19

... only plot dynamic stress vs. dynamic strain, but also get E¢, E≤, E*, tan d, h*, and other dynamic properties for each cycle. This allows us to plot those properties as a function of dynamic stress ... in Figure 4.11a. Note that the important dimensions are the same as ©1999 CRC Press LLC FIGURE 4.15 Results from dynamic stress–strain curves showing (a) the relationship between dyn...

Ngày tải lên: 05/08/2014, 09:19

... but they are normally too weak or too broad for determination by these methods. DMA, Dielectric Analysis (DEA), and similar techniques are usually required. 19 Some authors have also called ... T b compared to the T g for a high-impact and low-impact nylon. It has been shown, particularly in cured thermosets, that increased freedom of movement in side chains increases the...

Ngày tải lên: 05/08/2014, 09:19

... Measurement of Viscoelastic Properties by Dynamic Mechanical Analysis, Masters thesis, Univer- sity of Texas at Austin, 1994. R. Hagan, Polymer Testing, 13, 113 , 1994. 3. S. Goodkowski and B. Twombly, ... Chapter 7. Sometimes the polymer is added as a binder to an inorganic material, like the magnetic particles used to make the magnetic coating on a videotape. This is then coated on a...

Ngày tải lên: 05/08/2014, 09:19

... This is also done with thin films and adhesive coatings. A sample cure profile for a commercial two -part epoxy resin is shown in Figure 6.6. From this scan, we can determine the minimum viscosity ... gives the viscosities of common materials. As we shall see below, the post-cure is often a vital part of the curing process. The cure profile is both a good predictor of performance as well as a...

Ngày tải lên: 05/08/2014, 09:19

... sufficient flow under pressure at low frequency to fill the pores of the material to obtain a good mechanical bond. When the laminate is later subjected to peel, we want the material to be very elastic ... method and added to the data collected by frequency scans. However, as creep is not the same as dynamic tests, sometimes the data are not even similar GN¢== ÆÆ Æ () () ()wwggyg wg g 2 0 1...

Ngày tải lên: 05/08/2014, 09:19