Temper rolling or skin pass rolling is one of cold rolling processes composed of a horizontal pass cold rolling mill stand. In this process, the thick strip is subjected to very light reduction (0.5–4%) in thickness in the presence of high friction amplitudes. One of the basic parameters of strip rolling processes is temper rolling force. A new rolling force model has been proposed for temper r...

The current work aims to develop an approximation of the slice a Minkowski sum finite number ellipsoids, sliced up by arbitrarily oriented plane in Euclidean space R3 that, best author’s knowledge, has not been addressed yet. This actual is closed form explicit parametric equation case that passing through zones surface with high curvatures, namely “corners”. An alternative computational algori...

In [6], Murray Marshall proved that every f∈R[X,Y] non-negative on the strip [0,1]×R can be written as f=σ0+σ1X(1−X) with σ0,σ1 sums of squares in R[X,Y]. this work, we present a few results concerning representation particular cases. First, under assumption degY⁡f≤2, by characterizing extreme rays suitable cone, obtain degree bound for each term. Then, consider case f positive and non-vanishin...

Strain gauges are widely applied to measure mechanical deformation of structures and specimens. While metallic foil gauges usually have a gauge factor slightly over 2, single crystalline silicon demonstrates intrinsic gauge factors as high as 200. Although silicon is an intrinsically stiff and brittle material, flexible and even stretchable strain gauges have been achieved by integrating thin s...

An efficient analytical model is described which predicts the value of compressive strain below which buckle-driven propagation of delaminations in aerospace composites will not occur. An extension of this efficient strip model which accounts for propagation transverse to the direction of applied compression is derived. In order to provide validation for the strip model a number of laminates we...

Abstract In the present paper, fundamental frequency optimization of symmetrically laminated composite plates is studied using the combination of Elitist-Genetic algorithm (E-GA) and finite strip method (FSM). The design variables are the number of layers, the fiber orientation angles, edge conditions and plate length/width ratios. The classical laminated plate theory is used to calculate the n...

ABSTRACT The majority of concrete buildings in the regions of high seismicity in Iran do not meet seismic code requirement, and many of these buildings are vulnerable in severe earthquakes. Concerns for seismic strengthening of concrete grew considerably in the recent years, and has been accelerated since the Bam earthquake 2004. This paper presents the results of experimental and analytical st...

Sandwich construction is widely accepted as a method of construction especially in the aircraft industry. It is a type of stressed skin construction formed by bonding two thin faces to a thick core, the faces resist all of the applied edge loads and provide all or nearly all of the required rigidities, the core spaces the faces to increase cross section moment of inertia about common neutral ax...

Given a finite set of circles of different sizes we study the Strip Packing Problem (SPP) as well as the Knapsack Problem (KP). The SPP asks for a placement of all circles (without overlap) within a rectangular strip of fixed width so that the variable length of the strip is minimized. The KP requires packing of a subset of the circles in a rectangle of fixed dimensions so that the wasted area ...

The survival probability of a particle diffusing in the two dimensional domain x > 0 near a " windy cliff " at x = 0 is investigated. The particle dies upon reaching the edge of the cliff. In addition to diffusion , the particle is influenced by a steady " wind shear " with velocity v(x, y) = v sign(y) ˆ x, i. e., no average bias either toward or away from the cliff. For this semi-infinite syst...