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This article addresses (3D) flow of Carreau liquid in the presence of nanomaterials induced by a nonlinearly extendable surface. A nonlinear extendable surface generates the flow. Heat and mass transport via convective process is considered. The novel characteristics in regard to Brownian dispersion and thermophoresis are retained. The variation in partial differential framework to nonlinear ordinary...
This paper presents a study about injectors, where the radial injector was evaluated. This type of injector was chosen because only a small amount of information on it was found. Thus, the radial injector will be compared with other two types of injectors, the orifice plate and the swirl, in terms of parameters, such as discharge coefficient (Cd), regression rate r, and specific impulse (Isp). In...
Lithium-ion-based secondary battery packs are emerging as an alternative power source and are being increasingly used in electric vehicles, hybrid or plug-in hybrid electric vehicles. Typically, a standard automotive battery pack consists of hundreds, even thousands, of individual cells which are connected in series and/or parallel to deliver the required power and capacity. There is an increasing...
In order to research the spherical spiral groove hybrid gas bearings, the Realizable k − ε turbulence model of gas film was established based on FLUENT. The simulation calculation method of 6-degrees of freedom passive grid was used, which can simulate the lubrication characteristics of the gas film transient flow field accurately. And the gas film pressure distribution and dynamic characteristic...
In this article, failure analysis was examined in four-cylinder light-duty truck diesel engine crankshaft. The failure happened in service after 95,000 km of operation by fatigue crack growth which was initiated from a surface defect on the second crankpin from the crankpin–web fillet. For such objective, standard specimens were cut off from the crankshaft and examined to evaluate the mechanical properties...
Cable shovels are one of the most widely used machines in open-pit mining industry. Precise estimation of payload can effectively avoid overload and underload for each dump, significantly improve the working performance of cable shovels and reduce the maintenance costs of haul trucks. In this research, an algorithm based on static analysis for payload online estimation was established, which took...
The scientific career of Vicente Lopes Jr at UNESP—Ilha Solteira—spanned three decades in which he worked on new applications of smart structures in structural health monitoring and active vibration control. Prof. Lopes Jr. was one of the pioneers in Brazil for using smart materials and intelligent structures, having supervised several students during his career. This article is a tribute, due to...
This paper presents a novel system of evaluating the block quality in order to obtain the optimal block. Two algorithms for an automatic optimal block decomposition for complex geometries with arbitrary profiles based on genetic algorithm theory are proposed. One is serial optimization, which decomposes the domain according to a certain sequence. The other is global optimization, performed by optimizing...
Reducing the deformation of the transport bracket was the basic means to improve the mate precision between the large tonnage round bar and the bracket. The finite element model of the bracket was established and the actual loading conditions of the bracket for transporting the large tonnage round bar were analyzed by ABAQUS. The deformation and the weak areas of the bracket were investigated by the...
The present study focuses on the drilling processes and its parameters of titanium–titanium boride composites which are optimized using Taguchi technique. The titanium–titanium boride composites aiming 20% and 40% of titanium boride (by volume) is processed through three different powder metallurgical techniques such as, spark plasma sintering, hot isostatic pressing and vacuum sintering, respectively...
Some studies have been developed to demonstrate that welded plates have their natural frequencies reduced when comparing them to non-welded similar plates, which is caused by welding residual stress. This phenomenon can be used to develop a new welding residual stress detection method. This new method, analyzing the plate vibrational responses, would have the advantage of being nondestructive, when...
A novel magnetorheological (MR) hydrostatic guideway system for control of machining vibration is proposed. After the analysis of the relationship between correlation parameters and working variables, a computational fluid dynamics (CFD) model is presented. With this model incorporated into the commercial code FLUENT, a numerical study on performance parameters of MR hydrostatic guideway system is...
In today’s world, microstructures have a wide range of applications in the field of biomedical devices, aerospace engineering, MEMS device elements, etc. In the recent years, reverse micro-electro-discharge machining (R-µEDM) has evolved from µEDM that has become one of the promising technologies to fabricate precise components and microstructures of various shapes with high aspect ratio. In this...
The present paper aims at exploring numerical and exact analytical procedures for evaluating the shear stress and tangential displacement in variable thickness rotating disks having angular accelerations solid or annular and density alterations along their radius. Galerkin method, a subset of weighted residual techniques, is applied for the numerical part. The procedure reduces a continuous equilibrium...
The most important goals pursued by the automotive industry for a long time are the quality and the delivery time. In order to ensure that such premises are fulfilled, it is necessary that these companies have machines with fast production cycles and versatile layouts, able to adapt to the production of a large number of different parts. At the same time, for some production lines to spend the shortest...
Over the years, sinking electrical discharge machining has become one of the most important production technologies to manufacture very accurate three-dimensional complex components on any electrically conductive material. This article reports a literature review on the diversity of conventional and non-conventional materials that are used or have potential to be used as EDM electrodes. In addition,...
The present article emphasizes on reducing the edge chipping and taper during rotary ultrasonic drilling of one of the most demanded ceramic glasses “BK-7.” Statistical tools of design of experiments and backing plate were adopted as two distinct approaches to curb the chipping damage. Central composite design has been conjugated with desirability function for framing the design matrix. This investigation...
In the present article, an appraisement is made to investigate the effects of gravity and initial stress in a fiber-reinforced, anisotropic, thermoelastic half-space with diffusion. The enuciation is applied to generalized thermoelasticity based on Lord–Shulman (L–S) theory. Solutions are obtained in the frequency domain, by using a standard mathematical technique. The physical quantities are established...
In linear elastic fracture mechanics (LEFM), several models under constant amplitude loading describe the propagation of a crack, and these models are formulated by an initial value problem (IVP). However, for most applications, it is not possible to obtain exact numerical solutions for IVP due to the mathematical formulation of the stress intensity factor. From this, approximate numerical solutions...
Springback is a geometrical defect that occurs due to the removal of the bending force acting on the component the end of the forming process. In the present study, springback behavior of Ti-Grade 2 sheets is studied by finite element method and experimentation. The process parameters considered are punch radius, die opening and sheet thickness. Based on Taguchi (L9) Orthogonal array, the simulation...
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