Dynamic properties of polyurea-milled glass composites Part I: Experimental characterization

Nantasetphong, Wiroj; Jia, Zhanzhan; Amirkhizi, Alireza V.; Nemat‐Nasser, Sia

doi:10.1016/j.mechmat.2016.04.005

Cited by 30 publications

(14 citation statements)

References 18 publications

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“…The long‐term durability and integrity of the fiber reinforced polymer composites is highly important as they exhibit time–temperature‐dependent degradation in modulus and strength primarily due to the viscoelastic nature of the polymer matrix . Therefore, the analysis of time‐dependent plastic deformation (i.e., creep and recovery properties) with varied temperature is highly essential for the use of composites in long‐term structural applications, particularly with varied environmental temperatures . Constant application of load for a prolonged period on polymers might result in stretching and reorientation of polymer chains, eventually leading to failure of the polymer matrix .…”

Section: Introductionmentioning

confidence: 99%

Creep performance of CNT reinforced glass fiber/epoxy composites: Roles of temperature and stress

Nomula

Rathore

Ray

et al. 2019

J of Applied Polymer Sci

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Carbon nanotubes (CNTs) have been emerged as a potential nanofiller to reinforce polymeric materials to improve their mechanical properties, like strength and modulus. However, time‐dependent deformation of such materials under a constant load and elevated temperature is a matter of concern for long‐term durability of these materials. The present article primarily demonstrates the effects of creep temperature and stress on the reinforcement efficiency of CNT in a glass fiber/epoxy (GE) composite. Two types of materials were investigated in this study—GE which was used as a control material, as well as CNT embedded GE composite. To elucidate the impact of CNT on the long‐term durability of GE composite, creep tests have been performed at different temperatures (50, 80, and 110 °C) under bending loading. As applied stress has also significant contribution toward the elevated creep deformation of materials, creep tests have also been carried out under different stresses (5, 10, and 40 MPa). The strength of the CNT‐GE composite exhibited 8.7 and 18.3% higher than that of control GE composite under tensile and bending load, respectively. Results suggest CNT reinforcement to be beneficial for low temperature applications, both in terms of creep strain and strain rate. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47674.

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Section: Introductionmentioning

confidence: 99%

Creep performance of CNT reinforced glass fiber/epoxy composites: Roles of temperature and stress

Nomula

Rathore

Ray

et al. 2019

J of Applied Polymer Sci

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“…When the temperature is below T g , the relationship between the shift factor and temperature is given by the Arrhenius equation [ 37 ], which is defined using the following expression:

where E a is the activation energy, T is the (absolute) temperature, and R the thermodynamic constant.…”

Section: Methodsmentioning

confidence: 99%

Estimation of Tensile Modulus of a Thermoplastic Material from Dynamic Mechanical Analysis: Application to Polyamide 66

et al. 2022

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The mechanical properties of thermoplastic materials depend on temperature and strain rate. This study examined the development of a procedure to predict tensile moduli at different strain rates and temperatures, using experimental data from three-point-bending dynamic mechanical analysis (DMA). The method integrated different classical concepts of rheology to establish a closed formulation that will allow researchers save an important amount of time. Furthermore, it implied a significant decrease in the number of tests when compared to the commonly used procedure with a universal testing machine (UTM). The method was validated by means of a prediction of tensile moduli of polyamide PA66 in the linear elastic range, over a temperature range that included the glass-transition temperature. The method was applicable to thermo-rheologically simple materials under the hypotheses of isotropy, homogeneity, small deformations, and linear viscoelasticity. This method could be applicable to other thermoplastic materials, although it must be tested using these other materials to determine to what extent it can be applied reliably.

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“…The initial guess for α f (P o ) was obtained using equations 11 and 12, with the assumption that parameter B is 1. Constants c 1 and c 2 were measured and recorded elsewhere [26]. They are shown in Table 1.…”

Section: Applicationsmentioning

confidence: 99%

Constitutive modeling and experimental calibration of pressure effect for polyurea based on free volume concept

Nantasetphong

Amirkhizi

Nemat‐Nasser

2016

Polymer

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The combined effect of pressure and temperature on the mechanical behavior of polyurea is characterized and integrated into a constitutive model based on Williams-Landel-Ferry (WLF) equation. An increase in pressure is related to a decrease in temperature, both pressure and temperature affecting the polymer's molecular free volume and thereby introducing a pressure-dependent term into the WLF equation. The model is derived based on Fillers and Tschoegl's original work, regarding the free volume as a state variable. The model provides a closed-form expression for the time scale shift factor for equivalent temperature in terms of temperature and pressure and its threedimensional surface representation. The prediction of the present model agrees well with pressure shift factor data obtained from confined compression tests of polyurea, reported elsewhere, confirming our constitutive model and its experimental calibration procedure. A simplified model of the pressure effect is also developed which yields good approximate results.

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Dynamic properties of polyurea-milled glass composites Part I: Experimental characterization

Cited by 30 publications

References 18 publications

Creep performance of CNT reinforced glass fiber/epoxy composites: Roles of temperature and stress

Creep performance of CNT reinforced glass fiber/epoxy composites: Roles of temperature and stress

Estimation of Tensile Modulus of a Thermoplastic Material from Dynamic Mechanical Analysis: Application to Polyamide 66

Constitutive modeling and experimental calibration of pressure effect for polyurea based on free volume concept

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