Crimson Publishers-Mechanical Engineering

Numerical Modeling of Nano Bundle and Nano Rope-Reinforced Polymer Mechanical Properties by Seyed Hossein Mamanpush*, Zohre Matin Ghahfarokhi and Hossein Golestanian in Crimson Publishers: Journal of Mechanical Engineering Carbon nanotubes (CNTs) demonstrate unusually high stiffness, strength and resilience, and are ideal reinforcing materials for polymer-based nanocomposites. Van der Waals interactions between the nanotubes often result in formation of nanotube bundles and/or ropes. Determination of mechanical properties of the nano bundle and nano rope-based nanocomposites is difficult due to the complicated geometries of the reinforcement structures. However, to better utilize nanocomposites, it is crucial to determine mechanical properties of nanocomposites in their real form as much as possible. In this paper, the elasticity theory for anisotropic body and continuum modeling are used to determine effective mechanical properties of bundle and nanorope-based nanocomposite...

Effects of Carbon Nanotube Dispersion on the Material Properties of Polymer Matrix Composites by Azadeh Tavousi Tabatabaei, Seyed Hossein Mamanpush* and Bahareh Tavousi Tabatabaei in Crimson Publishers:  International Journal of Mechanical Engineering Carbon nanotubes (CNTs) constitute a prominent example of structural nanomaterials , with many potential applications due to their unique mechanical properties. Substantial improvements in mechanical properties of polymers have been attained through the addition of small amounts of carbon nanotubes. The way in which CNTs are distributed inside the matrix can be divided into two main categories namely: aligned and randomly distributed. Modeling of carbon nanotube dispersion in the polymer matrix is an important step for understanding the characteristics of composites. For modeling CNTs dispersion in the polymer, a numerical homogenization technique based on the finite element method (FEM) is used. https://crimsonpublishe...

Compression Behavior of Pa-12 Pipes Under Large Displacements by De Almeida LS, de Oliveira TA, Maurício MHP and d’Almeida JRM* in Crimson Publishers: Materials science Polyamide (PA) pipes are being increasingly employed in fluid distribution networks . Most of these pipes is used in underground networks, where overloads can cause large deflections. Excessive displacement can lead to product failure and can cause surface cracks and leakage of the fluid being transported. This condition can be maximized if the pipe is aged due to effects of the environment or of the fluid itself. In this work, the effect of aging PA pipe segments by their exposure to hot water is presented and discussed. The deformation characteristics of the material before and after aging are evaluated. The results indicate plasticization of the pipes due to exposure to hot water, and, thus, the loads required to cause a specific degree of compression, characterized by reduction of the pipe’s diameter, a...