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Kink band is a typical phenomenon in longitudinal compression of composites. Numerical simulations considering fiber misalignment and plastic matrix with ductile damage have been built to study the formation of kink band. The matrix was simulated by using the extended Drucker-Prager constitutive model. Then random fiber strength distribution and stiffness reduction were considered to simulate the...
Torsional buckling and failure of carbon fiber/epoxy resin composite thin-walled tubes (CTWTs) were tested and analyzed, and the effects of torsional buckling on the material failure and failure loads were simulated by finite element method. In order to enhance the torsional bearing capacity of CTWTs, the buckling/failure of the tubes filled with polymer foam were further simulated by ABAQUS. Numerous...
The calculation of thermal stresses of insulating glass units is based on the pressure distribution of the insulating layer, which was rarely researched. This paper studies on the pressure distribution under different factors and the results show that factors such as the thickness of glass plates and insulating layers, the temperature difference between two sides of glass plates and the width of glass...
The identification procedure for nonlinear control system of shield machine tunneling is proposed by using neural network. Based on nonlinear constitutive model of soil and mass conservation law, the difference equation of nonlinear discrete system is deduced. Bp neural network is applied for an identifier to estimate model parameters of time varying control system. The numerical simulation shows...
Recently, percutaneous aortic valve (PAV) replacement has been investigated as an endovascular alternative for the treatment of aortic stenosis. Percutaneous valve intervention requires a thorough material characterization of the human aortic root and ascending aorta for successful PAV deployment and function. Recent PAV clinical trials have been conducted on animal models under the assumption that...
In this study, we investigated the mechanical properties of porcine aortic sinus using a three-dimensional marker measuring technique called the direct linear transformation (DLT) method. By recording pressure-inflation tests of five porcine aortic roots with the use of two cameras simultaneously, we were able to obtain stress and strain responses of aortic sinus upon applied luminal pressures and...
Inonotus Obliquus is a medicinal mushroom that is widely used in folk medicine in Russia, North Europe and China. The objective of this study was to evaluate the antioxidant and hypolipidemic capacities of Inonotus Obliquus polysaccharides(IOP). In vivo, the hyperlipidemic rats, induced by high-fat diet, were provided 100, 200, 500 mg/kg day of IOP for 8 weeks to evaluate their expected hypolipidemic...
According to the complicated working condition and heavy load properties of wind turbine transmission system, an analysis is performed considering bearing clearance and thermo-mechanical coupling. Taking a high-speed gear pair in a MW-class wind turbine transmission system as an example, the contact and bending of the gear pair are analyzed by using FEM (Finite Element Method). The analysis results...
The mechanical parameters of conditioned earth in the head chamber of shield machine are determined for computing response of conditioned earth with the speed change of screw conveyor. The relationship between the strain and the accumulating amount of earth is proposed based on Duncan and Chang's model. The relationship between the increment of earth pressure and the angular velocity of screw conveyor...
Recently the influence of accommodation coefficient, which determines the behaviors of the reflected molecules at the boundary walls, was studied a lot for exploring the flying characteristics of head-disk interface. However, all of the researches are based on the slider with unique accommodation coefficient. In this paper, the different correction models of Reynolds equation, the free molecular gas...
Durability allocation is an important part of durability design in mechanical system. Whether durability allocation is reasonable or not directly impacts the pertinence and validity of maintenance. When designing durability, lifetime data of components is necessary. The way to obtain lifetime is normally through test which takes so long and cost so much so that it cannot be adopted at initial stage...
This 3-point bending device is intended to provide the user with a novel tool used to obtain material property information for biological tissues. Specifically, the device is intended to provide the user with the stress-strain relationship of the tested tissue in the low-strain region (Lt5% strain) and provide the location of the neutral axis. The stress-strain relationship is useful because it allows...
Computational fluid simulations were developed for a generic blood-interfacing implantable device. The simulations were analyzed to determine hemodynamic behavior within the device, including velocity profiles, the magnitude of shear stress, and pressure drop. By monitoring 100 streamlines, the total blood damage induced by the device was estimated and compared to that observed for a bioprosthetic...
Edge-to-edge repair (ETER) technique alters mitral valve inflow in the diastolic phase and thus the stress distribution on each leaflet, especially the area near sutured edges. In the present study, we performed finite element simulations of ETER mitral valve during the diastolic phase under different pressures. We conducted planar biaxial mechanical testing to obtain the material properties of native...
In this paper, computer modelling techniques are used to analyse the effects of globtops on the reliability of aluminium wirebonds in power electronics modules under cyclic thermal-mechanical loading conditions. The sensitivity of the wirehond reliability to the changes of the geometric and the material property parameters of wirebond globtop are evaluated and the optimal combination of the Young's...
A numerical modelling method for the analysis of solder joint damage and crack propagation has been described in this paper. The method is based on the disturbed state concept. Under cyclic thermal-mechanical loading conditions, the level of damage that occurs in solder joints is assumed to be a simple monotonic scalar function of the accumulated equivalent plastic strain. The increase of damage leads...
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