Applied Mechanics and Materials Vols. 580-583

Abstract: The motion characteristic of cavitation bubble is one of the major factors affecting acoustic cavitation. In this paper, a cavitation model coupled with acoustic pressure is established using lattice Boltzmann pseudopotential model. Aimed at demonstrating the feasibility of applying LB method in acoustic cavitation, the acoustic cavitation simulations are compared with the predictions of Keller equation. The comparison of theoretical prediction and numerical simulation shows that LB method is suitable for acoustic cavitation simulation.

Abstract: Similarity Principle, applied to model test, is an important theoretical basis for simulation of the prototype test. By simulating the prototype test. On the base of model test to make research on this field indirectly. Saving time and energy, the article is based on the similarity principle, and combine with the model pile static pressure test, discuss the application of similarity principle.

Abstract: Downburst is an outburst strong wind on or near the ground, and its wind field characteristics are significantly different from boundary layer winds. Continuous mountains at different distance are one of the main factors for the influence of downburst wind field characteristic. In this thesis, the changes of the wind field characteristics under the influence of continuous mountains at different distance after the downburst happened are studied by CFD numerical simulation. The impact of downburst is analysed and summarized through the charts.

Abstract: The wind pressure asymmetric coefficient is used to express the variation of wind distribution along the transmission line. In this paper, the value of the wind pressure asymmetric coefficient in some international codes is discussed and compared. It’s shown that the coefficient has no relationship with the span length of transmission only in Chinese code. When the span of the checked transmission line is small, the wind pressure calculated based on Chinese code will be smaller than that based on others.

Abstract: This paper aims to investigate the performance of a new three-parameter damage mechanics model which describes three basic damage mechanisms of quasi-brittle solids: tension, shear, and hydrostatic compression. The stress is first decomposed into its positive part and negative part, and then the latter is further decomposed into its deviatoric part and hydrostatic part, whereby a three-parameter damage description is formulated. Through matrix representation of the tensor formulation, specific forms of the three-parameter damage theory are illustrated in various stress states. It is found that the proposed framework of three-parameter damage theory can inherit the existing two-parameter models and extend them to a broader scope of application.

Abstract: In this paper, an integrated simulation system for building structures is presented to satisfy the engineering requirements for high performance simulation. It is a coalition of the traditional design softwares and general finite element analysis (FEA) softwares. This system is developed in the platform of Intel Fortran, using the programming language of Fortran2003/2008. For simplicity, it would be introduced and discussed briefly in the following article. And combining with YJK and ABAQUS, this system is implemented to perform dynamic analysis for a high-rise building. Its capacity and validity would be demonstrated by the numerical results.

Abstract: This paper introduces Design Builder (DB) software and analyzes the computational simulation capacity of Design Builder that is used to deal with built environmental issues, in order to help readers to have a more comprehensive understanding of Design Builder’s simulation capacity in processing built environment.

Abstract: Split Hopkinson Tensile Bar (SHTB) apparatus is widely used in experimentally investigating the mechanical properties of materials. The experimental results are significantly depended on the amplitude, the shape and the wave length of incident wave. However, theres no research on the effect of incident wave especially the influence of parts of the SHTB equipment has been put forward. The mechanism of the overlying and the amplitude of incident wave by FEM has been analyzed, which can give much help for the theory basis of SHTB apparatus design.

Abstract: Using the HJC dynamic constitutive model, the Split Hopkinson Pressure Bar (SHPB) impact test with confining pressure for concrete was simulated in the software ANSYS/LS-DYNA. The confining pressure was simulated by applying constant pressure around the specimen. The triangle velocity wave, which has less diffusion, is used as loader in the simulation. The confining pressures used were 0MPa, 2MPa, 4MPa, 8MPa and 16MPa and the stress-strain curves were presented. The influence of confining pressure on the dynamic properties was analyzed by comparing the stress-strain curves of concrete under different stress states. The strain rate decreases sensitively as long as the confining pressure increases. By debugging the impact velocity, the stress-strain curves under the similar strain rate were obtained, which indicate the toughening and reinforcing effect with the increase of confining pressure.

Abstract: As a general-purpose finite element program, ABAQUS’s strong non-linear calculation capacity make it especially suitable for elasto-plastic time-history analysis, in this paper, with a super high-rise project, the experience of elasto-plastic time-history analysis using ABAQUS is described, include the modeling process, material constitutive model, numerical integral method and evaluation of analysis results, some reference will be provided to the other engineering practices.