Applied Mechanics and Materials Vols. 513-517

Abstract: In this paper, the pseudo-dynamic test of the plane steel frame with slit T steel connection was carried out.According to the results of the experiment,we focused on the analysis of strain,the acceleration response,displacement response and hysteretic performance of the steel frame to investigate the seismic performance of the steel frame,so as to provide experimental basis for improving the design of steel structure in our country.

Abstract: In order to prepare an anaerobic adhesive which has a good heat resistance, the epoxy acrylate of polyhedral oligomeric silsesquioxanes (POSSEA) -containing was synthesized and was used as a as main composition of adhesive monomers. The anaerobic adhesive was prepared from POSSEA, 2-hydroxyethylacrylate, acrylate, and selecting a suitable redox initiating system. The correlated properties were determined by DSC, TGA, so on. The results show that the appeared reaction order of curing reaction was 0.87 and activation energy E_a was 59.9 kJ/mol. The initial degradation temperature of this adhesive is 302 °C, and followed first order kinetics. The adhesive shear strength of steel plate is 24.6MPa. The results indicated that this anaerobic adhesive has well bonding strength and high temperature resistance property.

Abstract: Combining with the electron microscope analysis of the morphology of incision, the mechanism of abrasive water jet cutting metal materials was carried out to explore, for the rational selection of abrasive jet cutting parameters, to extend its application to provide the basis. Study shows that the abrasive water jet cutting metal materials, the material damage mechanism is mainly to yield deformation and failure and shear of grinding damage, grooving formation is mainly caused by falling impact deformation and furrows grinding.

Abstract: Hole doped compounds (Sr, Na)₂FeMoO₆ with the Na content of x = 0, 0.02, 0.03, 0.07 and 0.17 have been synthesized by sol-gel method. Effects of hole doping on the crystal structure and magnetic properties of Sr₂FeMoO₆ have been investigated. XRD pattern indicates that all the samples are of single phase and belong to the space group I4/m. The degree of cation ordering in the Na-doped Sr₂FeMoO₆ compounds shows a non-monotonic variation with the doping level. The saturation magnetization of the compound increases with x for x<0.17. Provided that the doped hole enters selectively the spin-down band, the variation of the saturation magnetization can be explained in light of the ferrimagnetic model (FIM), which is Similar to the electron doped Sr₂FeMoO₆.

Abstract: Our theoretical study aims to The way of obtain C₅H₈O⁺ fragments laser-induced by cyclic ketone ion ( C₇H₁₂O⁺ ) excited state and gives out a result with proved and directed significance for the corresponding experiments. On the issue of theoretical calculation of C₇H₁₂O⁺ excited state, the corresponding vibration mode is given by the Gaussian03 calculation; in the analysis of vibration mode, it gives the possibility of C₇H₁₂O⁺ dissociation into fragments and the corresponding fragment analysis. In order to obtain relevant data of the fragments dissociation mechanism, we take the way analysis of C₅H₈O⁺ ion fragmentation as an example, then the bridge of experiment and theoretical calculations will provide a reference basis.

Abstract: This article make the typical station HZS240 steel structure as the research object, according to the design parameters of the main building of steel structure, build a structural mechanics, carried the dynamic characteristics of the finite element modal analysis on the concrete batch plant used advanced analysis software, obtained the structure of each order natural frequency and vibration mode features. Through the natural frequency and vibration mode, we understand the dynamic characteristics of structure as a whole. Provide a reliable reference to design a security, economic, reasonable structure of the main building steel structure.

Abstract: In order to effectively describe the damage process of composite laminates and reduce the complexity of material model, a mixed damage model based on Linde Criteria and Hashin Criteria is proposed for prediction of impact damage in the study. The mixed damage model can predict baisc failure modes, including fiber fracture, matrix tensile damage, matrix compressive damage. Fiber damage and matrix damage in compression are described based on the progressive damage mechanics; and matrix damage in tension is described based on Continuous Damage Mechanics (CDM). Meanwhile, for interlaminar delamination, damage is described by cohesive model. A finite element model is established to analyze the damage process of composite laminate. A good agreement is got between damage predictions and experimental results.

Abstract: Widely use of composite structures such as fiber-reinforced composites advances the demand for reliable and effective techniques of ultrasonic nondestructive testing. The model to calculate acoustic field around anisotropic materials is introduced, including propagation and penetration model of Gaussian beams in front of and behind the composites. Simulation and experiments on transmitted acoustic field of composites with different thickness were conducted. Some characteristics of ultrasonic filed around composite materials, such as focal distance and beam spread have been researched theoretically and experimentally. The accuracy of the proposed model is verified by the comparison of the model-based predictions with the experimental results. The achievement will be useful for detecting the defects inside of composites nondestructively.

Abstract: The calibrator is an important part of extrusion die. Its cooling and calibrating ability directly influence the quality and output of the profile. Based on the analysis of the heat transfer process during cooling in calibrator, the initial and boundary conditions of cooling numerical simulation are further analyzed and calculated. Then the cooling process of plastic profile in calibrator is simulated. The calculation rationality of the initial and boundary conditions and the accuracy of numerical simulation are verified by measuring the surface temperature of profile in production.

Abstract: The effects of different solvents on synthesis of base functional ionic liquid, butyl pyridinium hydroxide ([bPy]OH), from butyl pyridinium bromine ([bPy]Br) were investigated systematically using KOH/NaOH as the base agent and strong base anion exchange resin. The results showed that the yield of [bPy]OH achieved 35% with the molar ratio of 1:1.1 ([bPy]Br to NaOH) using dichloromethane under room temperature. With isopropanol and 8 h of the reaction time, the yield could reach 88% with byproducts. The yield of 97% without byproduct was achieved by using strong base anion exchange resin in column chromatography static reaction for 0.25 h. The yield of carboxyl and pyridine functional ionic liquids based on neutralization method, exchange method and one-step method were compared and the results showed that the one-step method possessed the maximum yield of 88% with 3 h of the reaction time at room temperature.