Objective To establish a three-dimensional (3D) finite element (FE) model of ankylosing spondylitis (AS) kyphosis that is a digital platform for further studies. Methods A 30-year-old man with AS kyphosis underwent computed tomography transverse scanning from T1 to the sacrococcyx. The images were imported into Mimics® 17.0 software to establish a 3D model of the posterior spine, which was then...

Shot peening applies a residual compressive stress field (RCSF) on the surface of parts. It also shifts “crack nucleation sites” to sub-surface locations. A nondestructive method of measuring the stresses, Sin2ψ was utilized here and the stress values introduced to Ansys software. For this purpose, uniform stress in all directions was applied on the con rod. Loading on the rod in Ansys had thre...

in this paper the critical strain energy release rate for t300/913 carbon-epoxy laminated composites has been studied using ansys finite element software based on virtual crack closure technique ( vcct ). compact tension ( ct ) specimen has been used for numerical analyses and the geometrical dimensions have been extracted from the existing references. the results obtained from the finite eleme...

This paper presents the numerical modeling of a plate structure containing bonded piezoelectric material. Hamilton’s principle is employed to derive the finite element equations using the mechanical energy of the structure and the electrical energy of the piezoelectric material. Then, a numerical model is developed based on Kirchhoff’s plate theory. A computational program is implemented for an...

In spite that three-quarters of the Earth's surface is covered by water, the shortage of freshwater supply is posing a great threat to human survival. Therefore, seawater desalination has been considered a useful method to produce freshwater, and their use has increased significantly over the past two decades. This paper presented a mathematical model for the transient laminar flow in the seawa...

As a key part of the power machine, unmanned aerial vehicle (UAV) impeller is widely used in aerospace field, and it plays a very important role in the national defense industry. Impeller in the work of higher speed, centrifugal force and aerodynamic force effect on the impeller at the same time, so that the impeller is easy to failure, a serious impact on the use of performance and life of the...

In this paper, a fully coupled vibro-acoustic finite element model (FEM) is developed to characterize the structural and acoustic coupling of a flexible thin shell by a cylinder-like cavity. The combined integral-modal approach is used to handle the acoustic pressure inside the cavity. Based on the modal proposed, the impact excitation effect on the vibro-acoustic behavior of the coupled system...