Applied Mechanics and Materials Vol. 151

Abstract: Metal cutting is a very complex process of plastic deformation, and chip formation is a typical problem of large deformation, which involves the material nonlinearity, geometric nonlinearity and nonlinear state changes. Strain hardening model of Al 2024-T3 material is established based on elastic-plastic theory of material deformation. Finite element method is used in the analysis of the established model by ALGOR. The distribution of equivalent stress, yield stress and equivalent strain is concluded concretely in the metal cutting process in this paper.

Abstract: The binder system removal was studied in a laminated B₄C ceramics prepared by tape casting and lamination with castor oil, polyvinyl butyral(PVB) and di-n-butyl phthalate (DBP) as dispersant, binder and plasticizer, respectively. Thermo gravimetric analysis and Fourier transform infrared spectromer was used to examine the degradation of the binder system. The degradation behavior of the pure organics, single sheet and laminated B4C body were investigated. The results indicate that nitrog₄en was selected as the binder system removal atmosphere and two decomposition temperature ranges was obtained for organics. A model based on diffusion can be used to predict the binder system removal time for a certain thickness of laminated B₄C.

Abstract: Polyacrylate latex containing fluorine and silicon was successfully synthesized by semi-continuous seed emulsion polymerization, using organic silicon(OSi) monomer, fluorocarbon(FC), methacrylic acid(MAA), and butyl acrylate(BA) as raw materials. Transmission electron microscope(TEM) characterization indicated that the latex particles were form uniform analogous core-shell structure. Dynamic light scattering(DLS) show a narrow size distribution. The results of X-ray photoelectron spectroscopy(XPS) revealed the fluorine and silicon transfer to the film-air interface. The reaction was evaluated using fourier transform infrared(FT-IR) spectrum. The thermal stability of the latex films which analysed by thermogravimetric(TG) was improved due to the join of OSi and FC.

Abstract: The multi-physics of piezoelectric materials under different environmental conditions has been an active research subject for a few decades. Particularly, the thermoelastic behaviour of smart materials and structures is of great importance to their reliability in different applications. Traditionally, the Fourier heat conduction theory was introduced in dealing with the thermoelastic reactions of smart materials and structures. This may lead to reasonable analyses and useful guidelines in design of smart structures, especially when no severe thermal gradient is involved. However, when a severe thermal gradient is indeed involved in the service environment of a smart structure, the analysing results based on the Fourier heat conduction theory is unrealistic and usually rendered useless. Non-Fourier heat conduction theories have been introduced in the thermoelastic analysis of smart materials and structures in recent years and resulted in reasonable results. In this paper, we review the recent results of a thermopiezoelectric problem of a one-dimensional (1-D), finite length, functionally graded medium excited by a moving heat source using both the Fourier and Non-Fourier heat conduction theories. Numerical examples are displayed to illustrate the effects of non-homogeneity index, length and thermal relaxation time on the results.

Abstract: This paper proposed an efficient online algorithm, called JPS-SR, for shared path protection under dynamic traffic conditions in GMPLS. The algorithm was improved by introducing the set v_e, parameter α and ε, which reduced average hops of paths, and increased utilization of resources. The performance of JPS-SR was evaluated via simulation with FIR based on SPS (SPS-FIR) on a typical network (NSFNet). The simulation results show that JPS-SR can optimize the resource utilization and blocking probability.

Abstract: UG software is one of the most widely used CAD/CAM software in the field of computer aided design and manufacturing. By taking the socket cover as an example, this paper illustrates the application of the UG software-based CAD/CAM function in mold design and processing. And through such procedures as process design, parameter setting, simulation machining, entity processing and etc, real objects of the mold are finally manufactured.

Abstract: An optimization design method of a hyperbolic flexible hinge is presented in this paper. According to the structure feature and force exerted on the flexible hinge, the closed-form equations are formulated for compliances to characterize both the active rotation and all other in- and out-of-plane parasitic motions by using the Castigliano’s second theorem. Meanwhile, the accuracy equations of the hyperbolic flexure hinge are obtained using the Castigliano’s second theorem. The in-plane rotation angle of flexure hinge is optimization objective, and the constraints of optimization model are out-of-plane displacements and one described the accuracy of hinge, such that the optimization model can be established to meet performance requirements of flexure hinge. Based on the optimization model, the optimization designs of hyperbolic flexure hinge are performed to acquire its optimized structural parameters. And the optimization results have showed the optimization process can meet the design requirement.

Abstract: In view of the present mechanical rapid product development needs, this paper mainly discusses the use of UG for secondary development, use parameterized modeling method to establish the standard part library. And combined with examples expounding the second development method and procedure by use vc + + 6.0 and UG/open.

Abstract: Fixed beam gantry for large CNC boring and milling machine to bear the beams on the rail side apron, and other parts ram weight under weight and size of deformation produced a result of the assembly accuracy of less than standard, use three-dimensional modeling software UG and finite element analysis software ANSYS for dynamic beam gantry milling machine CNC beam three-dimensional modeling and modal analysis, based on weight and apron beams, the weight of ram and other components in relative deformation amplitude, and the gantry milling machine processing characteristics and overall design of the structural characteristics of machine tools, assembly of the beam is proposed to note some issues and some ways to solve the assembly size requirements, through finite element analysis of the deformation and comparing the actual measured value, the experiment proved data on-site assembly solution with a good theoretical support.

Abstract: In recent years, research in robotics, especially in bio-robot research has been much attention. Biomimetic robots that mimic the biological nature of the external shape, movement and behavior of systems theory, to work in the biological characteristics of the robot. Based on the environmental requirements of the structural design of feasible solutions, respectively, to determine the structure and behavior training system for biomimetic smart mice relative to the chassis structure, steering means, electrical layout and some details of the design model, then movement of the body of theoretical analysis, calculation the actual running resistance and the motor power required. Final processing of the entity to verify the feasibility of the behavior of the training system, and the bionic mouse to the system requirements, performance steering and sport good.