Applied Mechanics and Materials Vols. 184-185

Abstract: Finite element method is applied to analyze the buckling performance of composite stiffened panel. Compress buckling critical loads of six types panels with T or Z-section stiffeners are calculated by FEM. The emulational calculation results show that with same cross section area, critical buckling load of panel with T-section stiffeners increases with the reduction of stiffener pitch and the increase of stiffener numbers, while the buckling load of panel with Z-section stiffeners increases to a certain level and then keep almost changeless. To T-section stiffener panels, the relation between thickness of skin and buckling load is approximately quadratic trinominal. Conclusions obtained can offer a referenced measure for the optimization design and engineering application of the structure.

Abstract: Particle reinforced ceramics can be fabricated by a variety of methods, some of which have their origins in early civilization. The key objective of sintering studies is therefore to understand how the processing variables influence the microstructure evolution. In this way, useful information can be provided for the practical effort of designing processing conditions for producing the required microstructure.

Abstract: The novel adhesives were prepared using PF resin as matrix and sodium silicate as modification additive. It was proved by Fourier transform infrared spectrometer (FTIR) that silicon-oxygen bonds had been successfully introduced to the structure of PF resin. Boiling water extraction (BWE)，scanning electron microscopy (SEM)，thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC) were used to characterize the structure of PF resin modified with sodium silicate (Na2SiO3-PF). The test results show that sodium silicate is an effective modifier to PF resin which lessen the brittleness, accelerate the cure rate and enhance the boiling water resistance of PF resin as well. The FTIR，TGA and DSC test results also show that the structure of PF resin has been changed by sodium silicate.

Abstract: In recent years, as quality life improves, people begin to focus on quiet environment. Long-term noise pollution makes trouble of dysphoria and concentrating for people, thus noise-reduction has become an urgent project. This study uses Nylon 6 fibers, blended with different contents of low-melting PET fibers (10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt%), to fabricate Nylon6/ LPET nonwoven fabrics after needle-punching process. Afterwards, their maximum tensile strength, air permeability, sound absorption coefficient were all evaluated. When low-melting PET fibers contain 30 wt%, the nonwoven fabric has the better sound-absorbing property. Herein, the maximum tensile strength reaches 70.79 N and 31.01 N, respectively in CD and MD; the air permeability is about 116.5 [cm3/(cm2/s)]

Abstract: The knitted pretreatment has a great influence on the dyeing process. It should adopt different pretreatment process for different material. As the article selects jade fiber and cotton blended yarn to achieve good dyeing effect，the scouring is considered as the first and then bleaching. This article mainly studies the bleaching process.

Abstract: This article introduces the EKS heat-generating fiber and its heat mechanism. Studies on properties of EKS heat-generating fiber include the morphological structure, infrared spectrogram and single fiber strength. Studies on properties of EKS heat-generating fiber yarn include yarn strength, fineness uniformity, twist, moisture content, yarn hairiness, and acid and alkali resistance.

Abstract: Multi-walled carbon nanotubes (MWNTs) were used as filler to enhance thermal conductivity of Ethylene propylene diene monomer (EPDM) polymers. In order to study the thermal conductivity of the MWNTs/EPDM composites in three different directions, an experiment was conducted by the heat probe method. The results show the general average thermal conductivity of MWNTs/EPDM composites is 0.323 W/m•K，which is significantly higher than EPDM polymers. The maximum difference of thermal conductivity between two directions is 8.7% relative to the general average, indicating obvious anisotropic behavior.

Abstract: The article chooses Na, LiPb and LBE three kinds of metal coolant, and makes a comparative analysis of the thermophysical properties of Na, LiPb and LBE when they are at liquid state. The results show that Na has the lowest density and the largest thermal conductivity and specific heat capacity. There is a small difference between LBE and LiPb in terms of density, thermal conductivity and specific heat capacity. LiPb has the largest kinematic viscosity. The thermal conductivity of Na decreases as temperature rises, which is opposite of LBE and LiPb. The kinematic viscosity of LiPb increases as temperature rises. Considering thermal conductivity and specific heat capacity, LBE and LiPb are not the best coolant. However, their high densities can economize equipments and materials at the same time. When it flows, LiPb’s heat transfer capacity gets larger as temperature rises, this character can not be ignored in fusion reactor.

Abstract: The technologies of computer numerical simulations on casting process has penetrated into the every field of shape process, and offer a efficient tool for casting technological design. The paper briefly introduces the characteristics of the Flow-3d software on the principle and function, which is superior to that of other casting simulation software. Then, many die casting casts have been modeled and simulated, focus on the content of Pre-processing, summed up the major principles and skills on STL Import, Mesh Building and Control parameters selection of Flow-3D software by using the means of analogy.

Abstract: In the paper, it puts forward Framework of Environment adaptive Agent Based Materiel System Reliability Simulation Modeling, called as FARSiM, and dwells on the technology details from Conceptual Model, Agent Relationship Model and Message Transfer Model.The framework provides a current technology concept for adaptive Agent Based Materiel System Reliability Simulation, with better universality and maneuverability.