Mechanical properties of polymers and composites-Nielsen Episode 5 doc
Mechanical properties of polymers and composites-Nielsen Episode 5 doc
... all directions. Unoriented amorphous
polymers and annealed glasses are examples of such materials. They have
only one of each of the three kinds of moduli, and since the moduli are
interrelated, ... density of the material making up the beam of total
mass m, P the period of the oscillation, f
H
the frequency of the vibrations
in hertz or cycles per second, and / the r...
Mechanical properties of polymers and composites-Nielsen Episode 1 doc
... tests:
Rigid polymers 249
E. Effect of temperature 253
F. Rale of testing and the failure envelope 256
G. Effect of hydrostatic pressure 2t?3
H. Effect of molecular weight and branching 2 65
I. Effect of ... Engineering Moduli and
Tensor Moduli and Tensor Compliances for
Anisotropic Methods 52 4
V. On Rubberlike Elasticity 52 8
VI. List of Symbols 53 3
Index 54 5...
Mechanical properties of polymers and composites-Nielsen Episode 2 pot
... bewildering number of mechanical tests and testing instru-
m
ents. Most of these tests are very specialized and have not been officially
recognized as standardized tests. Some of these tests, however, ... variety of
units are used in reporting values of mechanical tests. Stresses, moduli of
elasticity, and other properties are given in such units as MK.S (SI), cgs,...
Mechanical properties of polymers and composites-Nielsen Episode 3 potx
... unsymmetrical polymers. Thus syndiotactic and
isoitactic poly( methyl methacrylate) have Tg values of 1 15 and 45 C
respectively.
The flexibility and cohesive energy density or polarity of each ... empirical constant of
Mechanieal Tests and Polymer Transitions 15 Other Tests
There are many other type's of mechanical tests in common use. One of
the most impor...
Mechanical properties of polymers and composites-Nielsen Episode 4 pdf
... 1 351 (1966).
23. ASTM Standards, 31, 1099 (1969). ASTM STP 463. 249 (1970).
24. ASTM Standards D648 -56 , D /53 5-65T, and D1637-61, American Society for
Testing and Materials, Philadelphia.
25. ... Testing and Materials. Phil-
adelphia.
17. I). Telfair and U. K. Nason, Mod. Plastics, 20, 85 (July 194.1).
15. D. R. Morey. Iml. EnR. Chem 37. 255 (19 45) .
W. ASTM Standards D...
Mechanical properties of polymers and composites-Nielsen Episode 6 doc
... comparisons of the responses of a set of polymers (7,16 ,54 -56 ).
These frequency/time response curves serve to delineate the effects of
changes in backbone structure (i.e., the type of polymer ... weight and molecular weight distribution, degree of cross-linking,
and of Plasticization. For two-phase and multiphase systems such as semi-
crystalline polymers and poly...
Mechanical properties of polymers and composites-Nielsen Episode 7 pdf
... effect of any change in £
()jr
Copolymers and plasticized materials often show another effect—a
broadening of the transition region with a decrease in the slope of the
modulus curve in the region of ... plateau.
Plasticizers and Copolymerization also shift the glass transition responses
of the amorphous phase of crystalline polymers. In addition, the degree
of Crystallinity...
Mechanical properties of polymers and composites-Nielsen Episode 8 docx
... 1(K) s and then the load was removed for the
recovery experiment.
Figures 5 and h show how the shape of the creep curve is modified by
changes in the constants of the model. The values of the ... amount of viscous creep, and in curve 111, viscous flow is a
prominent part of the total creep. The same data were used in Figures 5
and 6, but notice the dramatic, change in th...
Mechanical properties of polymers and composites-Nielsen Episode 9 doc
... amorphous polymers is
or. less accurately, using the average value of Au from many polymers, of
4.S x H) ' K \
is the difference between the liquid and glassy volumetric expansion
coefficients and ... approach.
A. Strain Dependence of Stress Relaxation
lor elastomers, Tobolsky (6), Thirion and Chasset (5) , and Guth et ai.
(56 ) have all reported qualitative conclusions...
Mechanical properties of polymers and composites-Nielsen Episode 10 ppsx
... of 0.980. Reid (80,81) has
suggested that for rigid amorphous polymers.
should be proportional
may be related to the
. For brittle polymers, the value of
to
onset of crazing.
Equations (32) and ... independence of strain and time,
for SBR (up to very large strains) and a polyurethanc rubber, llavsky and
Prins (60) and co-workers have presented similar explicit results for...
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