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Gurvich, Mark R.; Dibenedetto, A. T.; Pegoretti, Alessandro

doi:10.1023/a:1018603118573

Cited by 65 publications

(22 citation statements)

References 1 publication

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“…Strain at break values were corrected to account for the compliance of the measuring system. Weibull shape, a, and scale, p, parameters (36) were determined on the basis of an iterative procedure proposed by Gurvich et aL (38). The average strength Fh(L) at an arbitrary length L may then be estimated as:…”

Section: Materials Characterizationmentioning

confidence: 99%

“…As a consequence, aiming at predicting the efficiency of the shear stress transfer process for many poly meric matrices their viscoelastic behavior has to be taken into account. Nevertheless, little experimental work exists on the effect of temperature (5,12,(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48) and strain rate (43,48) on the interfacial shear stress transfer process and on ISS. The purpose of this study is to investigate the effect of temperature and strain rate on the interfacial shear stress transmission efficiency and on the interfacial shear strength in nylon-6/E-glass fibers model composites.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial stress transfer in nylon‐6/E‐Glass microcomposites: Effect of temperature and strain rate

2000

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In this study, the interfacial properties between E-glass fibers with different commercial sizings have been investigated on model composites with a nylon-6 matrix.In particular, the fiber critical length was measured by means of the single-fiber fragmentation test over a wide range of temperatures (from 25 to 175°C) and strain rates (from 0.008 to 4 min-l). The general trend observed is that the fiber critical aspect ratio increases as the temperature increases and it decreases as strain rate is increased. The fiber critical aspect ratio for unsized fibers resulted to be reasonably well linearly related to the square root of the fiber to matrix modulus ratio. This results is in accordance with the Cox's shear-lag theoretical model and the Termonia's numerical simulations. Sized fibers display an higher deviation from the theoretical prevision probably because of the presence of interphases whose properties are different from the bulk matrix. A s a consequence, the interfacial shear strength values resulted to be dependent on the fiber sizing. In particular, the fibers coated with an epoxy sizing showed a superior thermal stability of the fiber matrix-interface with respect to the unsized or nylon compatible sized fibers.

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Section: Materials Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interfacial stress transfer in nylon‐6/E‐Glass microcomposites: Effect of temperature and strain rate

2000

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“…The Wpdf is left-skewed (skewness < 0) if b > 3. 26. The dependence of skewness on the values of shape parameter (b) for the decomposition process of sodium bicarbonate under nitrogen atmosphere is presented in Figure 6.…”

Section: Resultsmentioning

confidence: 99%

Determination of Density Distribution Functions of the Apparent Activation Energies for Nonisothermal Decomposition Process of Sodium Bicarbonate Using the Weibull Probability Function

Janković

2007

Metall Mater Trans B

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The procedure for the determination of density distribution functions of the apparent activation energies (ddfE a s), for the nonisothermal decomposition process of sodium bicarbonate under a nitrogen atmosphere was established. It was found that the experimental integral and differential conversion curves at different heating rates can be successfully described by the nonisothermal Weibull distribution function (Wdf), in wide range of the degree of conversion (a = 0.15 to 0.98). It was established that the Weibull distribution parameters (b and g) show the different dependences on the heating rate of the system (v h ). It was found that the rate equation, expressed through the Weibull (nonisothermal) probability density function (Wpdf), can be used for the description of the sodium bicarbonate decomposition process under dynamic conditions. It was also established that the skewness of the Wpdf shows negative values and increases with an increase in the heating rate, but stays below the zero point. By applying the model independent (Friedman) method, the complex dependence of apparent activation energy (E a ) on the degree of conversion (a) was established. It was shown that in the conversion range of 0.25 £ a £ 0.95, the E a is practically constant (95.4 kJmol -1 ). It was concluded that the calculated ddfE a s are dependent on the heating rate of the system. The heating rate has the influence on the skewness of the Wpdfs, but does not change the reaction profile of the considered decomposition process. The complex dependence between the kinetic parameters (A and E a ) for the considered decomposition process was established. The evaluated ddfE a s show that the investigated decomposition process follows the same reaction mechanism, i.e., the twoparameter Sˇesta´k-Berggren (SB) reaction model. Also, it was concluded that such behavior leads to the complex dependence of E a on the degree of conversion (a), and this dependence is a natural consequence of the existence of the distribution of E a .

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“…Tests have to be made at several gauge lengths before drawing any conclusion. Nevertheless some disadvantages of this approach have been pointed out in a recent paper by Gurvich et al (1997). The average value of a sample size is taken into account, and not all experimental points.…”

Section: On the Extrapolation Up To Several Gauge Lengthsmentioning

confidence: 99%

Extrapolation techniques at short gauge lengths based on the weakest link concept for fibres exhibiting multiple failure modes

Zinck

Pays²,

Rezakhanlou³

et al. 1999

Philosophical Magazine A

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Cited by 65 publications

References 1 publication

Interfacial stress transfer in nylon‐6/E‐Glass microcomposites: Effect of temperature and strain rate

Interfacial stress transfer in nylon‐6/E‐Glass microcomposites: Effect of temperature and strain rate

Determination of Density Distribution Functions of the Apparent Activation Energies for Nonisothermal Decomposition Process of Sodium Bicarbonate Using the Weibull Probability Function

Extrapolation techniques at short gauge lengths based on the weakest link concept for fibres exhibiting multiple failure modes

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