Advanced Materials Research Vols. 774-776

Abstract: Al-high Si alloys are well known for their use as lightweight components in engineering applications, particularly within the automotive industries, due to their high wear resistance and low thermal expansion. It is desirable to increase the hot strength of these alloys by increasing the Si content. In this work, I have concentrated on the use of Al-high Si alloys for land vehicles. The automobile, engine components, the piston engine, four-stroke cycle and Al-high Si alloys in automotive applications will be discussed in this paper.

Abstract: The application of hydrated calcium silicate as filler in paper from wheat straw pulp is studied in this paper. It shows that that with the increase of dosage of hydrated calcium silicate, the stiffness of paper improves, and the whiteness and the printing color density of paper improve, but the tightness and tensile strength of paper decrease. When the dosage of CPAM is 0.45 g/kg, the tightness, tensile strength, tearing index, whiteness and printing color density reach the large value. Paper ash content increased with the increase of amount of hydrated calcium silicate, but paper ash gains is not big after the dosage of hydrated calcium silicate reaches 20%.

Abstract: The mechanical properties of heated granite subjected to two different cooling ways, namely cooled in the water (fast-cooling) and cooled in the air (slow-cooling) at room temperature, were studied respectively. The effects of the heating temperatures and cooling ways on the failure mode and failure mechanism of heated granite were analyzed. The tested results indicated that the longitudinal wave velocity, uni-axial compressive strength, and initial elastic modulus of heated granite decreased with the increasing heating temperature, especially for those subjected to the fast-cooling way compared to those subjected to slow-cooling way. To the contrary, the peak strain increased as the heating temperature increases, and the peak strain was bigger for the slow-cooling way than for the fast-cooling way. The analysis of the experimental results indicated that the water cooling accelerated the deterioration of the internal structure of heated granite and resulted in undesired mechanical properties.

Abstract: This paper expatiates to assist high-count yarn in the use of water-soluble yarn, and then to dissolve the water-soluble fiber of the poplin grey fabric, and to get the yarn-dyed poplin shirt fabric with high-count and high-density and softness. It presents a technology process of assisting 100^s cotton yarns to produce the yarn-dyed poplin shirt fabric design with high-count and high-density and softness by using 100^s water-soluble yarns.

Abstract: Through wetting pretreatment of the bamboo silver fiber, taking light ration, slow speed, large twist, and other feasible process configuration and technology measures, making the yarn quality reach a better level; optimizing spinning process, sizing formula, sizing process and weaving process to improve the weaving efficiency and improve the fabric style. It successfully developed the cotton-blended antibacterial functional fabrics of the bamboo pulp silver fiber.

Abstract: Poor compression in the strain clamp often makes the strands overheat and fracture. There exists a certain gap between conductors and the strain clamp if the strain clamp is compressed poorly. The ashes, oxide, corrosion and abrasion tend to gather and scale in the gap, forming scale layers of high resistivity. As the exposure time increases, the layers expand and thicken, which causes the worsening of conductive properties of current and heat, and leads to abnormal temperature elevation, the degradation of microstructure and properties and strands fracture at last. In consideration of this kind of strands fracture phenomenon and through FEM, non-uniform temperature field influenced by scale layer in the clamp has been analyzed and the quantitative relationship between the scale layer, peak temperature and current has been obtained. The results of material experiments show that the strands vary from each other in the roundness of shear lips. Serious erosion is found on the surface of outer Al (aluminum) strands attaching to the clamp, while there is almost no erosion mark on the surface attaching to inner Al strands. Erosion spots in Al strands surface attaching to the scale layer are the deepest, and each erosion pit is large and some of which have even developed into plaques. The interacting deterioration of scale and temperature causes the Al strands attaching to the scale layer to fail and then led to fracture-temperature domino effect of other strands. The longitudinal fibrous microstructure of steel strands disappeared as the temperature rose. The plasticity of strands increased after recovery and recrystallization. The rapid degradation of mechanics properties resulted in the drop accident of conductors.

Abstract: The optimal design of mineral composition of mould powder is significant for the improvement of quality of slab. This paper applies Matlab computing platform into mould powder proportioning scheme; designs multi-factor and multilevel orthogonal experiment based on CaO-SiO₂-Al₂O₃ mould powder system; prepares mould powder with the same content change of proportioning components and measures the melting temperature and viscosity of each mould powder; and establishes the regression relationship between viscosity and chemical components of mould powder by using Matlab to provide multiple pure quadratic regression analysis function of tool kit; analyzes the dynamic relationship between the viscosity of slag system and the content of various chemical components and provides quantitative analysis method for the optimal design of mould powder.

Abstract: A testing system of the strength of the ceramic sintering which can achieve a 20Mpa testing liquid pressure is presented in this paper. The system is in accordance with IEC60335-1:2006 Safety household and similar electrical appliance Part 1: General requirement ". The experiments show that the system can resolve the security issues of high pressure and explosive liquid in the test process.

Abstract: A revision of the basic assumptions those are usually used in the analysis of stability of thin delaminated layer and delamination propagation in a compressed composite is presented in this paper. For this purpose, the theory of flexible elastic plates with large displacements was used. As a result the compressive force and the total longitudinal strain of sub-laminate are expressed in terms of complete elliptic integrals, which uniquely identify the buckled shape of sub-laminate, the effect of buckling on the compression strain and increment of the compressive force in the buckled state. Stress and strain, as well as the strength of the buckled sub-laminate in the dangerous cross-section were also analyzed. The results of the general analysis of delamination propagation and its compression-bending destruction in the buckled state allow to define the basic regularities of the damage behavior of compressed layered composite.

Abstract: In this work, a method to eliminate ice on wind turbine blade by using carbon fiber composites was put forward. To prove that this idea is feasible, a carbon fiber composite panel with its ends soaked by the conductive silver paste was fabricated and surface temperature of it at three levels of voltages was measured. The surface temperature of the composite panel increased significantly and finally retained a constant, which shows that the carbon fiber composites can be used to eliminate ice when the glass fabric composite blades are covered by the carbon fiber composites.