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Mechanical Properties of Polymers and Composites

TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
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TL;DR: In this paper, an improved Burgers model is developed to describe the initial and steady-state creep; furthermore, a nonlinear Newton component is added to the accelerated-creep model.

49 citations

Journal ArticleDOI
TL;DR: In this article, the Tsai-Wu, Hoffman, Hashin-Rotem failure criteria that can distinguish between the off-axis strengths in tension and compression are evaluated for the accuracy of prediction of the offaxis strength differential (SD) effect and of the failure envelopes associated with offaxis loading at different strain rates.
Abstract: A difference between off-axis tensile and compressive strengths in a unidirectional carbon/epoxy laminate is examined at 100 °C for different fiber orientations and strain rates. By comparing their predictions with experimental results, the Tsai–Wu, Hoffman, Hashin–Rotem failure criteria that can distinguish between the off-axis strengths in tension and compression are evaluated for the accuracy of prediction of the off-axis strength differential (SD) effect and of the failure envelopes associated with off-axis loading at different strain rates. It is shown that the failure envelope associated with off-axis compression is unsuccessfully predicted by these failure criteria. The comparison suggests that the SD effects in the longitudinal, transverse and shear strengths should be taken into account for accurate prediction of the off-axis failure envelope. On the basis of this experimental implication, simple modifications to the representative failure criteria are attempted in which both the normal and shear SD effects are taken into account.

48 citations

Journal ArticleDOI
TL;DR: In this article, the effect of filler contents on the microwave dielectric, mechanical, thermal and moisture absorption properties were investigated and the experimental er and tan δ values of silicone rubber-micro-alumina composites were compared with that of theoretical models.

48 citations

Journal ArticleDOI
TL;DR: In this article, the mechanical and structural properties of poly(butylene succinate) (PBS) and 2wt% organo-montmorillonite (OMMT) filled PBS nanocomposites were modified by uniaxial cold rolling.
Abstract: Polymer nanocomposites have potentially enhanced properties when the molecular orientations of the polymer chains can be controlled. In this study, the mechanical and structural properties of poly(butylene succinate) (PBS) and 2wt% organo-montmorillonite (OMMT) filled PBS nanocomposites were modified by uniaxial cold rolling. Cold rolling was carried out to different compression ratios. The mechanical properties of rolled samples were studied in both the machine direction (MD) and the transverse direction (TD). Along the MD, distinct improvements in tensile strength and elongation at break were observed. However, the tensile strength degraded along the TD. Wide angle X-ray diffraction (WAXD) and microwave molecular orientation analysis reported on the degree of molecular orientation after rolling. Fur- ther, degree of crystallinity was reduced after cold rolling.

48 citations

Journal ArticleDOI
TL;DR: In this article, the mechanical properties and gas/water permeabilities of extrudates of low density polyethylene (LDPE), wheat starch and ethylene acrylic acid (EAA) or polycaprolactone (PCL) were studied after their conditioning at various relative humidities.
Abstract: The mechanical properties and gas/water permeabilities of extrudates of low density polyethylene (LDPE), wheat starch and ethylene acrylic acid (EAA) or polycaprolactone (PCL) were studied after their conditioning at various relative humidities. Satisfactory agreement was found between the experimental values, pertaining the mechanical properties, and estimates obtained by applying several semiempirical equations. The presence of starch contents (> 30%) or PCL had an adverse effect on the mechanical properties of LDPE/starch blends, whereas EAA acted as a compatibilizer by increasing the percentage elongation of the blends. Gas permeability and water vapour transmission rate increased proportionally to the starch/PCL content in the blend. Several theoretical and semiempirical calculation were also applied for gas permeability and possible interpretations were provided for the occasionally observed deviations between the experimental and the theoretical values.

48 citations