Applied Mechanics and Materials Vol. 387

Abstract: The problems of nonlinear local buckling of telescopic boom of truck crane in the practical working condition were studied. The arc-length method of nonlinear buckling analysis was introduced. And the corresponding solving steps were given. Based on ANSYS software and redevelopment of ANSYS with APDL (ANSYS Parametric Design Language), the solution of critical stress of nonlinear local buckling of the boom was obtained. The critical stress values of the linear buckling and those of the nonlinear buckling of the boom were compared. The influence of different initial imperfection on the critical stresses of nonlinear local buckling of the rectangular, hexagonal and dodecagonal sectional boom was analyzed. The results indicate that the presented method can solve the problems of the nonlinear local buckling of telescopic boom of truck crane effectively.

Abstract: Adhesive bonding as a promising join technique for composites is not widely used for the absence of absolutely understanding of loading behavior. In this paper both electric-strain gages and FBG sensors were employed to get the internal and surface strain of adhesive joint. In the experiment, nonlinear behavior is observed. Then the test data were compared with FEM results. It is showed that they meet each other well, FEM could get the stress distribution in adhesive bond composite joint, and both biggest peel stress and shear stress are appear at the end of adhesive.

Abstract: Fatigue properties of the newly-formed and served canopy PMMA, which was applied in a certain airplane, were studied by experimental method. In order to gain the fatigue strength in the designated life, experiments based on up and down method had been conducted. The S-N curves of the PMMA were acquired based on three-parameter exponential function. Fatigue properties of the canopy PMMA in the two different condition of service were discussed. The results of analysis showed that fatigue properties of the served PMMA did not decrease significantly compared to the newly-formed PMMA.

Abstract: Fatigue properties of canopy PMMA with typical damage, which are two different depth scratches of 0.3mm and 0.4mm, are studied by experimental method. In order to gain the fatigue strength about the depth scratches of 0.3mm in the designated life, experiments based on up and down method had been conducted. The S-N curves of the PMMA about the depth scratches of 0.3mm were acquired based on three-parameter exponential function. Fatigue life of the PMMA with the depth scratches of 0.4mm under different stress levels is obtained by grouping method. Fatigue properties of the canopy PMMA of the two different depth scratches were discussed. The results of analysis showed that compared with the depth scratches of 0.3mm, fatigue properties of canopy PMMA with the depth scratches of 0.4mm decrease significantly.

Abstract: In this paper, FEM modal analysis and experimental modal analysis methods were used to investigate the modal performance of the metal structure of a quayside container crane. The analysis results indicated that the relative error of both methods was reasonable small, and that most inherent vibrations of this crane were in the horizontal plane. The influence of vibrations caused by mass eccentricity of container and wind loads should not be ignored. The present results can provide a reference for solving similar problems in the future.

Abstract: Fatigue damage was analyzed of the rod-fastening rotor of gas turbine in the process of frequent start-up. The maximum stress of rotor was calculated, applying nonlinear damage mechanics model to analyze the fatigue damage of the rotor in the process of startup. Finally, we get the damage quantity in each process of start. It provides certain theoretical basis on slowing degradation velocity of the rotor.

Abstract: The cutting pick is primarily used in footing excavation such as coal mining and roadway excavation, so the performance of cutting tooth directly affect the mining capacity, the driving efficiency, and the service life of the tool. The quality of domestic mining pick is lower than that abroad, especially the tooth body wear of the whole shearer picks accounts for half of its overall failure. Thus tooth body 40Cr was treated by various heat treatment processes in this experiment, so as to improve the hardness and wear resistance of cutting tooth, analysis the surface wear scar of morphology, research the wear mechanism, that made for reducing the consumption of cutting tooth, improving work efficiency, and easing the labor intensity of workers undergound.

Abstract: Cutting tooth especially due to the poor quality of the shearer brazing, caused great pick consumption and delayed hours. The tooth body wear of the whole shearer picks accounts for half of its overall failure. In this experiment, the cutting pick jiont which was welded by induction brazing was strengthened by plasma arc powder surfacing, then analyse the microstructure, surface topography, and mechanical property of the weld jiont, so as to provide a new scheme for solving the tooth wear failure, and extending the service life. The pick failure problem caused by the lower hardness of the tooth tip, tooth wear, and the premature loss of hard alloy head.

Abstract: The target of this design is to modify and innovate on the basic original bicycle. It not only can offer all travel requirements, but also can provide a simple table to supply the rest and entertainment. This article will elaborate the bicycle design idea, design scheme, transmission device design, Solid Edge Modeling and stress analysis by ANSYS.

Abstract: The quality and dependability of the small unmanned plane is more and more important currently. For the small unmanned plane under the conditions of Low-Reynolds, the air viscosity has relatively greater influence on its aerodynamic performance. This is one of the greatest difficulties to design a small unmanned plane. The aerodynamic performance of bionic aerofoil and NACA 4412 is contrastively analyzed while the Reynolds-Number is and by the Fluent. The computational result and the analysis show that the fluid-structure interaction is an important issue to consider while designing the small unmanned plane.