OBJECTIVE Rod-screw fixation systems are widely used for spinal instrumentation. Although many biomechanical studies on rod-screw systems have been carried out, but the effects of rod contouring on the construct strength is still not very well defined in the literature. This work examines the mechanical impact of straight, 20° kyphotic, and 20° lordotic rod contouring on rod-screw fixation syst...

Existence of cracks in industrial structures is one of the important causes of their failure, especially when they are subjected to important axial compressive forces that might lead to buckling. Therefore, it must be considered in stress analysis and designing and loading of such structures. In this paper, the buckling and post-buckling behaviors of stainless-steel cracked plates under axial c...

Collapse by buckling a quite common phenomenon in sheets under pressure. When these structures caused by defects such as corrosion and cracks the time of the occurrence of this phenomenon is sensitive and critical load to be significantly reduced. Therefore, in this article sheet of aluminum Al 1200 by cracks in a part of the sheet will be considered. Left angle on the critical buckling load ef...

An intriguing aspect of torsion, especially for chemists, is the fact that, unlike stretching, bending, shear, uniaxial, radial or isotropic compression, expansion etc, torsion is the only mode of deformation that is intrinsically chiral. Hence, torsion can turn achiral objects into chiral ones, and it can discriminate between chiral enantiomorphs turning them diastereomorphous. Beside this uni...

Wet friction clutches play a critical role in vehicles equipped with automatic transmissions. It is unavoidable that they progressively degrade and eventually break down while the vehicles are under operational condition. To avoid unexpected failures, a proper condition monitoring tool extended with a lifetime prediction method should be implemented. In order to achieve this, appropriate parame...

Abstract High-voltage transmission tower-line systems in coastal areas are often affected by strong winds, which leads to structural damage the towers. Detailed analysis of mechanism towers is very useful ensure safety and stability power system. This paper examines mechanical properties cross-insulator structure under horizontal wind load, then load-carrying capacity deformation performance we...

If patient-specific finite element models of the spine could be developed, they would offer enormous opportunities in the diagnosis and management of back problems. Several generic models have been developed in the past, but there has been very little detailed examination of the sensitivity of these models' characteristics to the input parameters. This relationship must be thoroughly understood...

High aspect ratio wing (HARW) structures will deform greatly under aerodynamic loads, and changes in the stiffness have a great impact on flutter characteristics of such wings. Based this, this paper presents an effective method to determine effect HARWs. calculation theory mechanical profile thin-walled structures, torsional bending are obtained through calculation. We use fluid-structure coup...