By Kevin P. Menard
ISBN-10: 1420053124
ISBN-13: 9781420053128
Dynamic mechanical research (DMA) has left the area of the rheologist and has turn into a frequent instrument within the analytical laboratory. despite the fact that, info at the use of this crucial instrument remains to be scattered between quite a number books and articles. beginners within the box need to dig via thermal research, rheology, and fabrics texts simply to locate the fundamentals.
Updated with new fabric, improved sensible factors, and new functions, Dynamic Mechanical research, moment version maintains to offer chemists, engineers, and fabrics scientists a kick off point for utilising DMA to their person fields. It imparts a transparent knowing of ways DMA works, its merits, and attainable barriers. extra subject matters comprise stress/strain, facts dealing with, experimental expertise, attempt equipment, and information research.
One of the one references devoted to DMA, this obtainable and easy-to-read consultant gathers the main pertinent info on hand in this vital technique.
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Extra info for Dynamic mechanical analysis : a practical introduction
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11 shows the change that results from small mismeasurements of the sample. This drawing is based on a real problem we saw when a die was cut to the English system equivalent of a metric die by a machine shop. Use of the new die caused a shift in modulus values. Since everyone assumed both were the same diameter, several days of production were lost until someone actually measured the sample size. Corrected for the new diameter, the moduli now matched. Similarly, small changes in a three-point bending bar shift the modulus, too.
2 Creep testing involves loading a sample with a set weight and watching the strain change over time. Recovery tests look at how the material relaxes once the load is removed. The tests can be done separately but are most useful together. Stress relaxation is the inverse of creep: a sample is pulled to a set length, held there, and the force it generates is measured. 1. In the following sections we will discuss the creep–recovery and stress relaxation tests as well as their applications. This will give us an introduction to how polymers relax and recover.
Malkin and A. Isayev, Rheology, ChemTech Publishing, Toronto, 2006. 24. The following discussion was extracted from several books. The best summaries are found in L. , Marcel Dekker, New York, 1994. C. Rohn, Analytical Polymer Rheology, Hanser-Gardner, New York, 1995. R. , Structure Property Relationships in Polymers, Plenum Press, New York, 1984. D. , Elsevier, New York, 1990. indd 36 4/28/08 2:46:06 PM 3 Creep–Recovery Rheology Basic and Stress Relaxation The next area we will review before moving on to dynamic testing is creep, recovery, and stress relaxation testing.
Dynamic mechanical analysis : a practical introduction by Kevin P. Menard
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