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Considering the influence of material original flaw, combining with Finite element analysis results and linear elastic fracture mechanics methods, the thesis gave a certain type of casting crane girder for example to analyze its fatigue life including the designing, remaining and service life based on fracture mechanics and the design principle of disrepair-security. It offers more reliable theoretical...
A numerical analysis on the portal of two parallel tunnels is carried out, to learn about the effect on the staggered space of two tunnels to the liner stress of tunnel's portal. Thirty numerical models have been founded for analysis base on the different of staggered space of the two parallel tunnels. The results show that: if the clear distance and the separated mileage make change, the extreme...
The numerical simulation on welding process of simple structure in the paper, there are many problems have been handed. for example moving heat, latent heat of phase change and characteristic parameters of materials reduce nonlinear analysis and improve the efficiency by indirect method to calculate constructive field. ANSYS software was applied to analyze temperature field and stress field of welding...
Transducer is the main product which the giant magnetostrictive material applied for and Terfenol-D rod is the core component of the giant magnetostrictive transducer. Using ANSYS software analyzed the radial distribution rules of internal magnetic field intensity on Terfenol-D rod in high-frequency driven, which provided the theoretical guidance for reasonable and effective application of magnetostrictive...
The expression of radiate power and bandwidth are presented by using the aquivalent circuit model of the longitudinal vibration transducer. At first, the design variable and its constraint condition are exerted based on the design and environment in which the transducer is used. The optimization mathematical model of Tonpilz transducer is built up. Design variables of the resonance frenquency of 30kHz...
In the last half a century, the complexity of electronic systems has undergone a sustainable rapid development stage following the Moore's law: the density of integrated circuits (ICs) was doubled every two years. As a result, electronic devices become more miniaturized in space and contain more power in unit volume. Electronic package has to deal with highly increased I/Os with fine soldering pitch...
Infrared thermography has become increasingly important for non-destructive testing to detect internal defections, involving delaminations, cracks and voids. In this paper, the principle of infrared thermography is presented briefly. And a finite element approach is proposed to simulate the process of infrared thermography nondestructive testing about QFN packages. By changing with the length and...
Finite element analysis technology is an effective approach to research on mechanics performance of rubber component, but it is difficult to estabLish accurate finite element analysis model. Uncertainty of rubber parameter make theoretical analysis impossible quantitative. Rubber parameter of single metal floating face seals are gained accurately by adapting the theoretical analysis and tests, which...
The wireless temperature sensor could be widely used in on-line temperature monitoring of electrical equipment. In order to power wireless sensor and be isolated with high voltage, two novel kinds of micro generators excited by stray energy in electrical equipment are proposed. The vibration generator and temperature gradient generator could harvest mechanical vibration energy and heat energy in the...
The normal force characteristics of single-sided linear induction motor is analyzed using multilayer theory and finite element method (FEM). It is found that the magnetic permeability of back iron affects the analysis results obviously. In this article the equivalent magnetic energy method is used to correct the permeability of back iron in multi-layer approach. As the simulated object, the normal...
The vertical cavity surface emitting laser (VCSEL) is a very unique semiconductor laser diode since it operates in low current and can be tested during the fabrication process. Therefore, VCSEL is more preferable than the conventional edge-emitting laser diode for certain applications. However, the cavity design of a single-transversal-mode VCSEL is not straight forward. This research will explore...
This paper addresses the problem of heterogeneous deformable model accuracy using the finite element methods (FEM). Classic FEM uses predefined shape functions for interpolation and does not account easily for regions of discontinuities. Extended finite element methods (XFEM) use enrichment functions to compensate for the change in an element degrees of freedom (DoFs) in deformable objects. The XFEM...
In this paper we deal with full-wave modelling of pulsed terahertz systems utilized in non-destructive testing. At the outset, some basic information on the terahertz NDT and next general remarks on its numerical modelling are presented. Frequency domain FEM and time domain FDTD analysis is carried out. Finally comparison of computed and measured signals is shown in order to prove numerical analysis...
The use of Numerical Control and computers in manufacturing has enabled the development of new sheet forming processes. One of these flexible processes is called Incremental Sheet Forming (ISF) in which deformation is localized by the movement of a spherical or flat forming tool. ISF is carried out regularly by a CNC machine tool or by a Robot, which follows a tool-path generated by CAM programs,...
For the series of U-channel section, which has similar structure, it is easy to adjust the geometric model of U-channel section by using parametric design method, the efficiency is improved and the time for product design will be shortened greatly. By using the ANSYS Parametric Design Language (APDL), the FEA process including creating FEA model and analysis steps is discussed with the finite element...
For a solution of repair welding, the welding process of the entire multi-layer multi-channel is simulated and analyzed. The results show that has the big welding residual stress and distortion nearby welding joint as a whole, the residual stress is bigger away from the welding joint nearer, and the residual stress existence's high-risk spot is revealed. It provides a theoretical basis for the enterprise...
It is always difficult to model the viscoelastic damping material accurately in a dynamics analysis, because the frequency has great influences on characters of the viscoelastic damping materials. This paper presents an iteration control program based on QR damping modal extraction method in ANSYS for calculating the structure modal damping ratio more accurately.
Finite Element Method (FEM) model was built and model analysis was executed for a thin-wall cylinder dynamometer with ANSYS, the natural frequencies and modal shapes of the dynamometer are obtained. The topological optimization was done with the variable-density method. The utilization rate of materials was improved, and the lower model frequencies were increased.
To research the subdivisions of mesh about the semi-elliptic surface crack and stress intensity factors, this paper founded finite element model by simulating the semi-elliptic surface crack of the super-strength steel in FEM Analysis,the crack region is subdivided using a mapped mesh while the automatic tetrahedral mesher is used in the region outside the crack region, this example is also illustrating...
The tangential constitutive matrix is derived in the paper for the nonlinear finite element computation of rubber material as the strain energy function is expressed by Mooney-Rivlin model. The stress and strain of constitutive relation are separately expressed by Piola-Kirchhoff stress and Green strain with Lagrange description. As the incompressibility considered, the strain energy function is decoupled...
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