Mechanical properties of polymers and composites-Nielsen Episode 3 potx
Mechanical properties of polymers and composites-Nielsen Episode 3 potx
... ( _38 ). (39 ). ( 4 1 ) . and( 43) are still applicable
except that k is generally assumed to be empirical constant (51.96.101.102).
Equation ( 43) has been used many limes for the Tg value of copolymers. ... value of Tg for infinite molecular weight, in the
22 Chapter 1
value of plnsticized polymers is then given by (51.96)'
Equation ( 4 1 ) becomes equation (38 ) if K = 1...
Mechanical properties of polymers and composites-Nielsen Episode 1 doc
... Strength and Tearing 30 7
A. Nature of impact tesfs 30 7
B. Effect of notched 30 8
C. Effects of temperature 31 0
D. Effects of orientation 31 3:
E. Other factors effecting impacr stren|th HI
Mechanical ... all of the major mechanical properties of polymers:
l_ Molecular weight
2.
Cross-linking and branching
3.
Crystallinity and crystal morphology
4.
C...
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 4 pdf
... 7 63 (1982).
32 . R. M. Fuoss. J. -4m. Chem. Soc, 63, 36 9, 37 8 (1941).
33 . T. H. Sutherland and B. L. Funt. J. Polymer Sci., II, 177 (19 53) .
34 . H. Thurn and F. Wuerstlin. Kolloid Z., 145, 133 ... Intersaence, New York.
1948.
3. J I), Ferry. Viscoelastic properties of Polymers, 3rd ed., Wiley. New York,
1980.
4. I , n, Nielsen. Mechanical Properties of Polymers...
Mechanical properties of polymers and composites-Nielsen Episode 5 doc
... out of phase with the strain. Since
the in-phase component is exactly analogous to thaj of a spring, and the
out -of- phase component to that of a viscous response, the ratio of the
Figure 3 Vibrating ... directions (25 -30 ), by simulta-
neous axial stretching and internal pressurization of tubes (31 -34 ), or by
simultaneously stretching and twisting tubes or rods (althoug...
Mechanical properties of polymers and composites-Nielsen Episode 6 doc
... weight and molecular weight distribution, degree of cross-linking,
and of Plasticization. For two-phase and multiphase systems such as semi-
crystalline polymers and polymer blends, morphology and ... 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....
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
... relaxation of a Maxwell model (linear scales), T = 1 s.
3
Creep and Stress Relaxation
I. INTRODUCTION
Creep and stress-relaxation tests measure the dimensional stability of a
material, and because ... used.
When the stresses and strains become large and the stress-strain curve
becomes nonlinear, simple descriptions of the response and interconversions
between creep and r...
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 ... prominent plateau near
this long plateau is characteristic of very high-molecular-wcight
78 Chapter 3
Creep and Stress Relaxation 75
( 23, 24):
where K and n arc constant...
Mechanical properties of polymers and composites-Nielsen Episode 10 ppsx
... amorphous polymers.
should be proportional
may be related to the
. For brittle polymers, the value of
to
onset of crazing.
Equations (32 ) and (33 ) imply that factorizability holds and that an
applied ... chain,]
In general, the two sections of the curve in Figure 13 can be represented
by an equation of the form ( 134 - 138 ,28)
Creep and Stress Relaxation 83
and Halpin...
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