kevlar is one of the fbers which is used in heavy industrial productions such as, shipping, military and weaving for reinforcement of composites. initial polymer of kevlar or poly(para-phenylene terephthalamide) is an oriented liquid crystal polymer. existence of aromatic group in the main chain leads to formation of rigid-rod molecules in the polymer, high strength and high modulus in it is fb...

We newly introduce lift force into the aerodynamics of dust grains in a protoplanetary disk. Although many authors have investigated the effects of the drag force, gravitational force, and electric force on the dust grains, the lift force has never been considered as a force exerted on dust grains in a gas disk. We show in this paper that the dust grains can be continuously spinning as a result...

Abstract A case study on a rectangular post-tensioned concrete beam end block with 3-dimensional analysis is presented in this paper. ANSYS software used to model the end-block of specimen i.e., beam. An actual anchorage plate, widely construction modeled two different approaches, and concentrated jacking force applied same area. performed which modeling approaches are plate. For both plates, r...

A bimodular material is a kind of that presents two elastic moduli in tension and compression. In classical thermoelasticity, however, the rarely considered due to its complexity analysis. fact, almost all materials will present, more or less, characteristics, some cases, mechanical properties cannot be fully utilized simply by ignoring characteristics. this study, thermal stress problem curved...

In the practice of electrostatically actuated micro devices; the electrostatic force is implemented by sequentially actuated piecewise-electrodes which result in a traveling distributed electrostatic force. However; such force was modeled as a traveling concentrated electrostatic force in literatures. This article; for the first time; presents an analytical study on the stiffness variation of m...