Advanced Materials Research Vols. 482-484

Abstract: The static pile sinking calculation model has been established based on cavity expansion theory and the elastic-plastic analytical solution has been solved. This model can truly reflect the static pile sinking mechanism in collapsed loess region, providing a theoretical basis for the analysis and design of static pile. A finite element model has been set up to simulate the entire pile sinking process. The results show that due to relatively large pile rigidity and strength compared with the soil, under instantaneous load, the surrounding soil will produce a large deformation, which is mainly caused by pile friction diffusion. When the external load increases, the interaction between stress and pile-soil gradually increases; when reaching the proportion of limited load, both of them are close to constant, accordingly, the growth slows down and tend to be stable; when the external load is greater than the proportional limit load, the phenomenon of mutation occurs. Finally, after comparison, the finite element calculation results match well with the test results. Through analysis and engineering practice, static pile is found to have a good prospect in collapsed loess region. Some useful conclusion can be used as references for similar projects in these areas.

Abstract: A new high strength low alloy (HSLA) steel in 370MPa yield strength grade with low susceptivity to weld cold cracking has been developed for offshore engineering. The microstructure feature of base steel and weld heat affected zone (HAZ) has been investigated. The systematic studies showed that the developed steel exhibited high strength(yield strength≥370MPa)、high impact toughness and excellent weldability. The complex inclusions containing fine oxides in HAZ promoted the acicular ferrite formation in weld thermal cycle and resulted in desired mechanical properties of HAZ.

Abstract: With the sustainable construction the emphasis is placed on energy savings, reducing of consumption of natural resources, extending of the life cycle of recycling, etc. The research has brought about a new material - thermal insulation composite material - which is formed by a combination of recycled polymers and inorganic fillers satisfying the condition of recyclability. Using this material in the solution to eliminate thermal bridge at the wall foot can reduce heat loss of the building.

Abstract: The presented paper is focused on the numerical study of fracture behavior of polymer particulate composites. The polymer particulate composite is modeled as a three-phase continuum. Together with particles and matrix is considered an interphase. The interphase is created on particle-matrix interface. Non-linear matrix material properties were experimentally determined and used in calculations. The main aim is to estimate micro-crack propagation direction for the variety of matrix and interphase material properties. The results are obtained using the finite element commercial code ANSYS.

Abstract: One of the most important deterioration mechanisms of concrete is that caused by the changes of the cement matrix. For this reason, the Freezing and Thawing and Sulfate attack of concrete has been considered for years a subject of interest in researches of cement chemistry. The concrete deterioration process is a complex physicochemical process that slowly modifies the structures of the concrete in the course of time and induces changes into its chemical and physical properties

Abstract: Based on the coal-rock mass deformation model, hydraulic pressure descent model in fracture, fracture propagation model and its growth criterion, the mathematical model of hydraulic fracturing of low permeable coal-rock mass is established, and the influencing factors such as injection pressure, elastic modulus of coal-rock mass and in-situ stress, which affect the characteristics of hydraulic fracture propagation, are studied using the ANSYS software. The results show that fracture length presents a linear increase and widest width increases as an exponent function with the increase of injection pressure, and the ability of making fracture width is greater than fracture length during late fracturing; besides, with the increase of Young’s modulus of coal-rock mass and least horizontal stress, fracture length and widest width decrease, which are independent of maximum horizontal stress. The obtained conclusions provide a guiding role for the optimization of operation parameters of field hydraulic fracturing of low permeable coal-rock.

Abstract: This work proposes to study the compression behavior of the directly compressible excipients microcrystalline cellulose (MCC). Many factors play a significant role in the compression behavior, such as the particle size and particle size distribute, flowability, particle density, porosity and so on, thus making it necessary to understand the dominant contribution of each factor. We studied the compression behavior of different types of MCC from three aspects: the physicmechanical properties, compression process and tablet mechanic characteristics of the excipients. As expected from the elastic recovery measurements, the MCC gave coherent tablets that could be handled under the chosen experimental conditions.

Abstract: The technology of the stimulation of the toroidal worm is discussed in detail in this paper. In this paper, the technical scheme of the digital stimulation of the toroidal worm is established; the stimulating mathematical model is built. The digital stimulation and the contrast experiment of the toroidal worm are introduced, too.

Abstract: The reflection spectrum of Methyl Red (MR) doped PMMA film is measured and modified. The refractive index of the sample is gained by calculation of Kramers- Kronig relation with the data of the reflection spectrum. The refractive index change of the sample is gained with the absorption specta. The MR doped PMMA sample has a refractive index change under 532nm laser excitation, in which the valley value happens around 400 nm and peak value around 600 nm. This result shows that the MR doped PMMA sample has an obvious photo induced refractive index change, especially at 400nm and 600nm.

Abstract: In order to design industrial products efficiently, the Google's free software--SketchUp was used for the design and research of the product which can transform from a single chair to double person bench, and the SketchyPhysics plug-in was used to complete the dynamic showing process of the design product. The design cycle is short and it is easy to adjust and operate. SketchUp and its plug-ins can be competence for the design of industrial product and presentation.