Advanced Materials Research Vols. 87-88

Abstract: The new different-speed mixer is widely used in the production of hydrofluoric acid, amino plastics, synthetic rubber and so on. The stirring kneader shafts are the key parts of different-speed mixer, and the problems about strength of shafts were very important. The finite element model of the stirring kneader shaft was built based on ANSYS software in this paper. The ANSYS software was adopted for the static strength analysis of the stirring kneader shaft, and the dangerous points were found. Then these data were used to perform a fatigue analysis by ANSYS-Fatigue. The results showed that the new stirring kneader shaft was able to meet fatigue requirement during the whole service life.

Abstract: Two new series of liquid crystalline polyesters were synthesized using melt polycondensation reaction.Glass fiber,as a reinforcement,was meltpolymerized with 4-acetoxybenzoic(ABA),4,4＇-diacetoxybiphenyl, isophthalic acid(IA) and terephthalic acid(TA) to make TLCP/GF composites with a good mechanical properties.All the obtained compounds were characterized by conventional spectroscopic methods. The structure of the target compounds and intermediates was conformed by the IR, 1H NMR and SEM. The thermal behavior of the polymers has been characterized using polarized optical microscopy and differential scanning calorimetry. The effect of monomer structure and mechanical properties has been investigated on the prepared polyesters. These compounds show a high birefringent Schlierene texture characteristic of the nematic phase on heating and cooling experiments. This was further confirmed using differential scanning calorimetric investigations.The melting points of polymers having a central 4,4’-biphenyldicarboxylate residue have broad endotherms. The glass transition temperature values of polyesters are not effect by the glass fiber.According to the SEM result showed that the composite had strong fiber-matrix adhesion.The effect of copolymerization with added glass fiber in synthesis process is compared with that of the anlogous homopolyesters by other processing mode.Our finding shows that the copolymers exhibit reduced technical process and maintained mechanical properties.

Abstract: The pressure function method being different from traditional (experienced) design method. Natural balance outline design method is a tyre structure design method. Based on mathematics and mechanics reasonings, the structure and shape of the tyre were controlled by pressure function and then the structure design was further achieved. The mathematic-physical equations of the pressure function method were established. According to numerical calculation, the reasonable structure of tyre and the prediction of tyre-inflated shape could be accomplished. The pressure function method can reduce the cost and improve the design efficiency.

Abstract: The application of activated zinc oxide compared with ordinary zinc oxide in sole rubber was investigated. The experiment showed that activated zinc oxide could improve the microstructure and cross-linking degree of cross-linked rubber, the tensile strength at 100% elongation and at 300% elongation. The ageing resistance increased by 12%. With the amount of activated zinc oxide increased, the modulus at 100% elongation, the modulus at 300% elongation and shore hardness assumed increased, but the elongation at break, tear strength, the ageing resistance presented dropped.

Abstract: Based on the working principle and working process of the tire building machine, the spindle model of the tire building machine was established by analyzing the load of the spindle. Utilizing COSMOS to do the FEM analysis, the structural optimization was carried out. The deflection of the spindle determining the precision of the tire should be minimized. Meanwhile, in order to reduce the cost of the spindle, the volume of the spindle should be minimized. In this paper, the weighted coefficient method was applied to solving this multi-objective optimization problem. As no ready-made formula was found for the deflection of the spindle, the following method was adopted. Firstly, the calculation in COSMOS with different values was conducted, and then the curve fitting was finished in MATLAB to get the formula between defection and diameter of bore, and finally the optimization of the volume and defection was achieved.

Abstract: Rapid electrical heating cycle injection molding technology can be used to produce polymer parts with no weld mark, flow mark and other surface defects on the parts surface. Recently, it has been gradually found wide use in plastic injection industry. In this paper, a structure of the rapid electrical heating cycle injection mold and its working processes were presented. As the production efficiency and the part’s quality are seriously affected by the temperature of the mold cavity surface and its distribution uniformity, the heat transfer process of the mold was analyzed by using 3D finite element simulation. The transient temperature values on different places of the cavity surface were obtained. The results provided theoretical guidelines for the engineers to evaluate the layout of the heating rods in the mold.

Abstract: The different-speed mixer is used in the rubber industry widely. The dynamic response of different-speed mixer shaft is very key. Some displacement and dynamic stress response values of different-speed mixer shaft frequency are obtained by using the finite element method, which gives the basic theory for further systematic dynamic analysis and the structure design of different-speed mixer shaft.

Abstract: Many biomaterials have been developed to replace articular cartilage. One of these materials, polyvinyl alcohol (PVA) hydrogel is proposed to be used as artificial cartilage in joint replacement. To better understand the differences between human articular cartilage and PVA hydrogel, microstructure analysis and unconfined compression were developed. In microstructure analysis, the surface of articular cartilage was smooth and free from any significant morphological features. Some small holes were found in the surface and cross-section of PVA hydrogel. The porous structure of PVA hydrogel was observed clearly by Environmental scanning electron microscopy (ESEM). In unconfined compression tests, the compression modulus of articular cartilage was higher than that of PVA hydrogel. In the creep tests, the strain value of articular cartilage was lower than that of PVA hydrogel all the time. It is indicated that the microstructure of each material has a great influence on their biphasic property which related to their mechanical behavior.

Abstract: Due to the technical factors such as analytical design and virtual prototyping, the simple but representative sliding bar was chosen in this paper and its mathematical model of working contour was established by using the analytic method. And then, the parameterized model and VRML file structural drawing of sliding bar were given by using double extrusion method. It was proved that the components of the tripod universal joint were formed easily by using the double extrusion method based on Extrusion nodes. In addition, the tripod universal joint assembly model was also accomplished by using Inline nodes and bottom-up assembling method.

Abstract: Through measuring the thermal conductivities and tensile strength of nature rubbers filled with carbon black and comparing with each other, it is shown that the difference of carbon black particle size and the structure affects on the thermal conductivity and tensile strength of nature rubber. Thermal conductivities of carbon black-filled nature rubber are enhanced with the increase of volume fraction of filler; tensile strength of composite increases first and then decreases with the increase of carbon black volume fraction.