Mechanical properties property correlations

A number of attempts were made to correlate Js with E, H, and [65]. Js generally tends to increase with H, and K., but no satisfactory correlation was foimd with any one of these three mechanical properties. Therefore, correl-... 

The phase morphology of the blends determines the mechanical properties. These correlations, which will be described in the following sections, have been investigated in different ways. 

Using the statistical software SPSS to analyze the relationship between mineral relative contents and the mechanical properties. The correlation indexes are shown in Table 6. 

Aghjeh R. Masoud, Khonakdar A. Hossein, and Seyed H. Jafari. Application of mean-field theory in PP/EVA blends by focnsing on dynamic mechanical properties in correlation with miscibility analysis. Compos. B. Eng. 79 (2015) 74—82. 

A model was developed to estimate properties of polymer composites which have voids of various sizes (large and small). Such voids are typically found between fiber tows (macrovoids) and inside the fiber tows (microvoids) in composites produced by liquid molding. The presence of these voids does prevent the matrix from adhering to the fiber which reduces the composite s mechanical performance. Larger voids do not seem to afiect performance as much as smaller voids do. In practice, the volume of voids in normal production is within 5% of the total volume of the composite. At 5% void volume, the mechanical strength of composite can be reduced by as much as 30%. This is considered a substantial imperfection but it is found in practice. The model developed predicts values of mechanical properties which correlate with void volume. In another application, magnetic resonance imaging helped to determine voids in solid rocket propellants and liners similar to those used in space shuttle. The voids were found to be in close proximity to the filler particles. 

NONDESTRUCTIVE MAGNETIC METHID OF INSPECTION OF THE MECHANICAL PROPERTIES OF CAST STEELS. 1. CONSTRUCTION OF CORRELATION MODELS and II. PRACTICAL APPLICATION OF CORRELATION... 

R. W. Cahn, Correlation of local order with mechanical properties, in "Local Atomic Arrangements... 

A wide range of nitroxidcs and derived alkoxyamincs has now been explored for application in NMP. Experimental work and theoretical studies have been carried out to establish structure-property correlations and provide further understanding of the kinetics and mechanism. Important parameters are the value of the activation-deactivation equilibrium constant K and the values of kaa and (Scheme 9.17), the combination disproportionation ratio for the reaction of the nilroxide with Ihe propagating radical (Section 9.3.6.3) and the intrinsic stability of the nitroxide and the alkoxyamine under the polymerization conditions (Section 9.3.6.4). The values of K, k3Cl and ktieact are influenced by several factors.11-1 "7-"9 ... 

Polycarbonate (PC) serves as a convenient example for both, the direct determination of the distribution of correlation times and the close connection of localized motions and mechanical properties. This material shows a pronounced P-relaxation in the glassy state, but the nature of the corresponding motional mechanism was not clear 76 80> before the advent of advanced NMR techniques. Meanwhile it has been shown both from 2H NMR 17) and later from 13C NMRSI) that only the phenyl groups exhibit major mobility, consisting in 180° flips augmented by substantial small angle fluctuations about the same axis, reaching an rms amplitude of 35° at 380 K, for details see Ref. 17). 

These include cold drawn, high pressure oriented chain-extended, solid slate extruded, die-drawn, and injection moulded polymers. Correlation of hardness to macroscopic properties is also examined. In summary, microhardness is shown to be a useful complementary technique of polymer characterization providing information on microscopic mechanical properties. 

Different characteristics of solvents seriously affect the sol-gel reaction in solution. This in turn influences the physico-mechanical properties of the resultant rubber-silica hybrid composites. Bandyopadhyay et al. [34,35] have carried out extensive research on stmcture-property correlation in sol-gel-derived rubber-sihca hybrid nanocomposites in different solvents with both chemically interactive (ENR) and noninteractive (ACM) mbber matrices. Figure 3.12 demonstrates the morphology of representative ACM-sihca and ENR-sihca hybrid composites prepared from various solvents. In all the instances, the concentration of TEOS (45 wt%), TEOS/H2O mole ratio (1 2), pH (1.5), and the gelling temperature (ambient condition) were kept unchanged. 

Hayash C.I., Shipley N., and Lewis R., Hypotheses that correlate the sequence, structure, and mechanical properties of spider silk proteins, Int. J. Biol. Macromol., 24, 271, 1999. 

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