Ultra-high molecular weight polyethylene (UHMWPE) woven fabrics have been shown to possess a high strength-to-weight ratio, low density, high-energy absorption, and abrasion-resistant properties. When subjected dynamic impact, the primary failure mode of UHMWPE fabric is yarn pullout, which results from poor inter-yarn friction between weft warp yarns. This work investigates potential use zinc ...

We combine molecular dynamics simulations of deformation at the submicron scale with a simple continuum fracture mechanics model for the onset of crack propagation to calculate the macroscopic fracture energy of amorphous glassy polymers. Key ingredients in this multiscale approach are the elastic properties of polymer crazes and the stress at which craze fibrils fail through chain pullout or s...

the increasing world demand for fish cannot be met by capture fisheries. aquaculture production is increasing and nowadays cage culture has an important role in meeting the world’s fish demand. the design of the physical structure of a cage is determined by the oceanographic conditions of the culture site. each design is site-specific and knowledge of the topography, wind force and direction, p...

in this paper, we investigated the necessity and effects of optimal control methods in the stability and performance of a micro-grid that operates in islanded mode. the micro-gird is consisted of a combine heat and power (chp), a capacitor bank (cb), photovoltaic panel (pv) as power generation sources. in addition, battery and the building electricity and thermal load are placed on the load sid...

modeling and wrench feasible workspace analysis of a spatial cable suspended robots is presented. a six-cable spatial cable robot is used the same as stewart robots. due to slow motion of the robot we suppose the motion as pseudostatic and kinetostatic modeling is performed. various workspaces are defined and the results of simulation are presented on the basis of various workspaces and applied...

This study presents the results from centrifuge modeling experiments performed to understand effects of temperature changes on vertical pullout capacity scale-model torpedo piles embedded in soft clay layers. The model pile is a pointed stainless-steel cylinder with fins at top, installed by self-weight base layer using stepper motor. An internal electrical resistance heater was used control te...

Understanding mechanical interactions at the root-soil interface is essential to predict erosion of vegetated slopes. Recently, shear strength vegetatedil under changing hydraulic conditions has been measured and modeled; however, interfaces have not investigated conditions. This paper proposes (1) a novel pullout apparatus measure suction, (2) Mohr-Coulomb-Vilar (MCV) model interfaces, (3) num...

To obtain a tensile strain-hardening behavior by using the ordinary polypropylene (PP) fiber, micromechanical model recommends increase of fiber low interfacial bond with an cementitious matrix. It was predicted that alkali-activated slag (AAS) composite high drying shrinkage performance would affect interface frictional during pullout.