Advanced Materials Research Vols. 228-229

Abstract: In this paper, the stress and strain of the tracked triangle wheel’s original basic frame which is used on shovel loader were analyzed in AnsysWorkbench. And topological optimization method was then used to optimize the basic frame so as to find out its best bearing structure, after which the original basic frame was improved and designed for the second time in the solidworks environment. And then, the stress and strain of the basic frame’s new structure were analyzed again. In the end, a comparison was carried out between the finite element analyze results before and after the topological optimization. According to the comparison, the weight of the basic frame is reduced by 22.5% while the stress and strain nearly keep the same.

Abstract: The debris flow is the uppermost water-destroyed type of highway, which caused large direct economic loss annually in china, especially in mountainous area highway small bridges and culvert damaged seriously. This paper started from the theory of debris flow two-phase flow, it is divide turbulent debris flow into liquid and solid, and with the turbulent debris flow wash against bridge pier increased, the erode depth overpass the burial depth of foundation, base bearing capacity reduced gradually and then result bridge pier instability; in addition for the strong force of impact of debris flow resulted in resistance to capsizing weaken. The damage of bridge and culvert’ foundation mainly duo to the erosion, which lead to the erode depth overpass the burial depth of foundation, furthermore, debris flow force of impact greater then structure resistance and result the structure instability and damaged.

Abstract: This paper focuses on the stability problem of a class of uncertain switched delay systems with nonlinear perturbations. Applying multiple functional technique, we establish a delay dependent stability condition via designing appropriate switching rule. It should emphasize that this result is a standard extension of linear delay differential equations. Meanwhile, this result is presented by LMIs and thus solved easily.

Abstract: This paper considers a retailer who wishes to procure a kind of product to meet customer’s demand and shows that the supplier and the retailer’s cooperetive pricing decision . We gives the prices of Pareto optimal equlibrium and compares the prices with that of cooperative supply chain and find that noncooperative system profit is less than cooperative system profit. Furthermore, we shows that on some assumption, Pareto optimal price policy is equivalent to jointly decision policy, i.e., Pareto optimal price policy can reach the whole system maximum profit, and the numerical example indicates that with the retailer operating cost increasing, the total profit of supply chain is decreasing.

Abstract: The master structure of product families, as a configuration network, is a collection of a variety of modular components and their configuration relationships. In the forming processes of the master structure of product families, various modularity types reveal complex dynamic behaviors with strong impacts on the connectivity of networks. The connectivity of the directed configuration network of realistic industrial steam turbines is investigated and found to be heterogeneous. The heterogeneity of configuration networks results from the reusability difference of components based on the copy mechanism, and the preferential and random attachment mechanisms of inputs and outputs of directed edges. Finally, an evolving model is established to characterize the growing process of the master structure of product families.

Abstract: Absorbing moisture of electrode coating easily leads to high diffusible hydrogen of welding seam, resulting in hydrogen embrittlement, porosity, cold crack and other defects.Microwave absorption material Fe3O4 is used to promote the reaction of palmitic acid, and reduce the diffusible hydrogen of weld bead. Electrode is immersed to the light petroleum solution containing palmitic and Fe3O4 particles, then the electrode is put into the microwave oven and become water-resistant . The results of FT-IR and SEM indicate that Fe3O4 absorb the microwave and lead to the reaction of palmitic acid and electrode surface. The electrode become water-resistant after microwave reaction, The best ratio of palmitic acid in the petroleum ether is 15%, and the weld diffusible hydrogen decreases to 74%.

Abstract: Pb- and La-doped (Bi,Pb)2(Ba,La)2Co2Oy ceramics were prepared by solid-state reaction method and the effect of element doping on the thermoelectric characteristics was investigated. Pb and La doping increased the electrical conductivity and transformed the conduction from a metal-like behavior to a semiconducting one. Different from the undoped samples, the values of Seebeck coefficients decreased with the increase of the temperature in the Pb- and La-doped samples. Pb doping in Bi2Ba2Co2Oy system improved the thermoelectric characteristics at high temperature and Pb/La co-doping improved thermoelectric characteristics at low temperature.

Abstract: In the present study, Cr3C2-NiCr coatings have been deposited using high velocity oxy-fuel (HVOF) system from two commercially available powders with different NiCr contents (25 and 40 wt.%) and manufactured by different process (the blended and agglomerated-sintered). Coating microstructures were studied by scan electron microscopy (SEM). Hardness, erosive wear performance of the two coatings was measurement. The influence of powder characteristics on the microstructure and erosive performance of Cr3C2-NiCr coatings was investigated. The erosion mechanism of Cr3C2-NiCr coatings was examined through the surface morphology of the eroded coatings. The results indicated that Cr3C2-NiCr coating hardness decreased from 822 to 702 Hv with increasing NiCr content from 25 wt.% to 40 wt.%, however, Cr3C2-40NiCr coating exhibits better erosive wear resistance in comparison to Cr3C2-25NiCr coating.

Abstract: In order to make up the deficiency of traditional design theory, time-dependent load is loaded on chamber, and continuity assumption, homogenization assumption, isotropy assumption, small transmogrification assumption and plane section assumption are made, then transient dynamic analysis is adopted to analysis the chamber’s strength. Analysis result is according to the theoretical calculation perfectly. Based on the analysis result, using maximum compressive stress and the deformation of chamber as constraints, the chamber’s area is optimized. During optimization, the subproblem approximation method is adopted, while local stress concentration, strong charge are not taken into account in optimization process. Optimization result shows the chamber's thickness can be reduced to 1/3 of original. That means the chamber’s weight can be reduced to 1/9 of original. It’s a good base for the optimization of whole barrel to reduce naval gun’s weight.

Abstract: It is indispensable to designing reshaping devices for ridge-till and no-till seeders that can work on the permanent ridge stably and have good seeding quality. The structural drawing of a reshaping device was designed according to the agricultural requirement of planting several rows crops on each ridge. Structural parameters and operating parameters of the device were analyzed and calculated, including dimensions of disk, deflection angle and inclination angle. Then, working resistance of the device was discussed. The virtual assembly model was constructed with Autodesk Inventor finally, which can contribute to designing other similar reshaping devices through updating the dimension of correlative parts.