Polyethylene stress-strain diagram

Fig. 23a. Stress-strain-diagram of a Polyethylene (Vestolen A 6042) film (stretching velocity 0,26 mm/s) b) Experimental (row I), synthesized (row II), and resolved (row III) bands of the CHj-rocking bands. The experimental spectra were scanned at the indicated positions (circled numbers) of the stress-strain-diagram (a).

In rigid polyethylene foam (y = 32 kg/m, cell diameter between 0.5 and 1.5 mm) the anisotropy of the macrostructure is particularly reflected by the shape of the stress-strain diagram (Fig. 14). When a load is applied normally to the foaming direction, the deformation of the material increases perceptibly. In contrast, the resistance of the structure to compressive stress applied in the direction parallel to foaming increases since unit surface area of the material contains more rigid GSE struts in the latter case than in the former. 

Young s Modulus. Young s moduli, E, for several resins are plotted vs. temperature in Fig. 7. Young s moduli were determined from stress-strain diagrams. At 4K, their values are within 10%. Therefore, the low-temperature values of E do not depend markedly on the detailed chemical structure. It must be emphasized that epoxy resins are energy-elastic and have a nearly linear stress-strain behavior to fracture at low temperatures. No rate dependence was found over several decades. This is not true for many high polymers, such as polyethylene (PE), which are not cross-linked. PE behaves viscoelastically, even at 4 K [%... 

Fig. 13a. FTIR spectra taken at 300 K during elongation of a high-density polyethyloie film with light polarized alternately parallel and perpendicular to the stretching direction b Stress-strain diagrams of high-density polyethylene measured at 300 K and 343 K...

Fig. 6.3. Dichroic ratios and stress as functions of strain and time (stretching velocity) for polyethylene for the CH2 rocking modes at 730cm (x) and 720 cm ( ). The stress-strain diagram is given by ( ). From K. Holland-Mortiz and K. van Werden, Makromol. Chem., 182 (1981), 651. (Reproduced with permission. Copyright 1981 Hiithig Wepf Verlag.)...

Stress-Strain-Time Diagrams, Including Failure Envelopes, for High-Density Polyethylenes of Different Molecular Weight... 

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