Applied Mechanics and Materials Vols. 130-134

Abstract: Taking aim at the phenomenon that the propagation process of one-dimensional stress wave in projectile will be exposed to reflection and transmission on the interface between mediums, based on wave impedance and limit yield of the different mediums inside some type projectile, using calculation and graphic method, analyses one-dimensional stress wave propagation in different mediums, educe ultimate loading action on projectile-loaded equipment.

Abstract: This paper uses a metal cutting simulation software AdvantEdge FEM as the platform, and simulates the drilling process of three different honed cutting edge K-Grade carbide drills. The aim is to study the influence of different magnitude of honed cutting edge on the the cutting force and torque. According to the simulation, the z-axis force and torque increase while the margin of the fluctuation decrease with the honed edge radius increase. In this paper, the z-axis force and torque reach the maximum and the margin of fluctuation in the smallest when using the honed edge radius of 0.10mm.

Abstract: In the article, a kind of regional force balance method based on plates and shells theories of elastic mechanics are applied to study the hoop membrane stress of the elbow-pipe, while internal pressure is as a single load. By learning the static balance equation ΣFx=0 of a micro-region segment of pipe shell, it is found that axial membrane stress σ₁ is perpendicular to x-direction and has no effect to equilibrium condition, here axial stress σ₁ is discussed explicitly. It shows that, the hoop membrane stress σ_h of the elbow is the times of straight tube’s hoop stress.

Abstract: In this paper, we analyze the working mechanism of the wedge-type anchorage in the hydraulic synchronizing lifting device and tradition one, discuss the engagement effect between the wedge and the steel strand, establish a mathematical model to analyze the wedge tooth strength and evaluate carrying contaminant capacity qualitatively. The results of the study indicate that: the hardness difference between the wedge and the steel strand, the tooth shape and relevant parameters, the inside tooth surface geometric structure, are key factors to improve the performance of the wedge-type anchorage, which provides the basis to the wedge tooth optimization design and its working life prediction.

Abstract: Surface flow velocity is a key parameter of glacier kinetic theories study. With the help of GPS, glacier surface flow velocity research improved convenient and accurate. Therefore, this paper is committed to acquire the condition of surface flow velocity of Qiyi Glacier during 2009 to 2010 based on GPS data, optical remote sensing images and topographic maps. And it is concluded that during this time, the average surface flow velocity of Qiyi Glacier is decreasing while distributed relatively fast on central and slowly on both sides, and area retreated about 0.06km² compared with that of 1965, whose value is consistent with motion mode of mountain glacier and the tendency of changes in Qiyi Glacier according to ELA data and Mass balance.

Abstract: Pulsating heat pipes are high efficiency heat transfer components having a great potential application in the field of electronic cooling and space applications. In this investigation, an experiment was conducted to study the influence of working fluid thermophysical properties on the thermal performance of flat-plate closed loop pulsating heat pipes (FCLPHP). The analysis of the forces acting on the liquid-vapor mixture shows that the surface tension, viscosity and latent heat of vaporization have important impact on the thermal performance of FCLPHP. The overall thermal resistance decreases with the decrease in surface tension, viscosity and latent heat of vaporization, leading to the heat transfer improvement of FCLPHP. An experimental correlation was developed to describe the relationship among the relative overall thermal resistance and the relative thermophysical properties. With the correlation, a sensitivity analysis was made. The results show that latent heat of vaporization is the prior factor to the all others to impact the thermal performance of FCLPHP.

Abstract: For the cooling system of plastic injection mold affects significantly the productivity and quality of the finial products, the cooling system design is of great importance. In this paper, considering the location, size, number of cooling channels and mold material properties, the optimization design of heterogeneous injection mold cooling system is discussed to achieve simultaneously fast and uniform cooling. A mathematical model is constructed in which the part temperature distribution uniformity and production efficiency are taken as the objective function for cooling system design of heterogeneous injection mold. For the reason of the non-linearity of design problem and the coupling of geometric with material variable, the design problem is divided into two sub-problems and the combining algorithm is used in such way that, the geometric optimization sub-problem is solved by Hooke-Jeeves method and the material optimization sub-problem is solved by particle swarm optimization (PSO) method. The effectiveness of the approach is illustrated by a design example of injection mold cooling system.

Abstract: On the basis of established mathematic model of regenerator heat transfer process, the process of heat transfer of ceramic honeycomb regenerator with the method of simulation is studied. The temperature distribution curve of regenerator and gas is obtained, the temperatures curve of regenerator and gas are closely related to time is investigated ,and the influence of operation and structure parameter to heat transfer of regenerator is discussed. All this work is to provide guides of rational design of single-ended regenerative burner.

Abstract: This paper introduces a novel radiant heat flux measurement method based on bimaterial microcantilever. Focus on flame radiant heat flux measurement, the theoretical analysis and optimization of the bimaterial microcantilever, such as its shape, size and thickness ratio are carried out. So the dynamic response time and measurement range of flame radiant heat flux are discussed and determined.

Abstract: In the dispensing jet based on GMA,current in the coil produces a large amount of heat,which affects the glue viscosity and magnetostriction constant and other parameters, and so bringing about poor quality dots, therefore, it is necessary to analysis the transient temperature field of jet dispenser .This article mainly discusses the transient simulation of temperature field of jet dispenser by means of the MSC·MARC software, then in contrast with the experiment results to master the laws of temperature, so as to take appropriate control measures in future.