Advanced Materials Research Vol. 908

Abstract: In this paper, based on experimental data of 17 full-diameter cores from sandy conglomerate reservoir, the relationship between various parameters and porosity /permeability in Archie Formula is studied. The average value of each parameter is given at the same time. The Archie formula has been improved, and real logging data is processed and interpreted with it. Comparison with the gas testing results shows that the improved Archie formula is proper for fluid properties evaluation in sandy conglomerate reservoir.

Abstract: Joints are the weak parts in the concrete frame structures, which are easy to be damaged in earthquake and cause the entire collapse of the structure. The technique of Sprayed FRP used for reinforcing concrete frame joints has many advantages, but the study is just started. The paper studied the seismic shear capacity of the core of the concrete frame joints strengthened by Sprayed FRP. Through the analysis of the mechanism of Sprayed FRP, the calculation formula of seismic shear capacity of the core of the joints strengthened by Sprayed FRP was established. The study may provide theoretical basis for further study of this new technology.

Abstract: Experiments were conducted to study the corrosion behaviors of nickel-base alloy 625 under various temperature and oxygen fluxes, since severe corrosion always happens in landfill leachate treated by supercritical water oxidation. It indicates that under the condition of various oxygen fluxes, corrosion rates of nickel-base alloy 625 have similar variation, but at different temperature, such variation of corrosion rates can not be found, which implies oxygen fluxes may have more effects on corrosion rate than temperature. Meanwhile, oxide films of nickel-base alloy 625 changed obviously from low oxygen flux to high oxygen flux. The precipitation on the surfaces of alloys are confirmed as NiCrO4, which may form by the combination of dissolved Ni²⁺ and CrO₄^2-.

Abstract: A cusp catastrophic model of rock pillar instability was developed under uniaxial stress conditions, based on the assumptive softening constitutive relations under static mechanics. The static criterion of rock pillar instability is derived. The dynamical nonlinear differential equation under nonequilibrium state followed by the cusp catastrophic model is introduced. The characteristics of rock pillars chaotic evaluation are studied under the change of linear stiffness. The results show that the rock pillars motion is chaotic when the linear stiffness is in a certain interval, which are proved by the calculated max Lyapunov exponent.

Abstract: A constitutive model is proposed to simulate the completely deformation process of rocks under uniaxial tension. Based on the revised elastic modulus method derived from the hypothesis of strain equivalence, we analyzed the relationship between the damage variable and the strain. It is found that the relation can be modeled using a sigmoid curve. This model can describe the complete deformation process of rocks under uniaxial tension satisfactorily. In particular, the nonlinearity near the peak in the pre-peak region is accurately captured by the proposed constitutive model. The rapid decrease of rock strength after peak load can also be captured satisfactorily. The used mathematical function is simple and the damage evolution process is clear. The validity of the model is verified using laboratory test data.

Abstract: Through the understanding of the concept of the prediction and find the port to port the importance of decision-making as a whole, and then select the use of exponential smoothing method to forecast the port throughput, on the property of the transport of goods packaging materials on the basis of deep understanding, goods to the port selection of packaging materials has a strong guiding significance.

Abstract: The CO₂/H₂S corrosion behaviors of oil tube steels N80 and P110 at different temperature were investigated by corrosion rate calculation and corrosion morphology observation. The results show that with the increase of temperature, the CO₂/H₂S corrosion rates of both steels increase at first and then decrease, and reach the peak at 90°C. The corrosion rate of steel P110 is higher than that of steel N80.

Abstract: The corrosion behavior of rebar HRB400 in 1.5 wt.% NaCl solution was studied, and the mechanical properties before and after corrosion were tested. The results showed that, with the increase of corrosion time from 240h to 720h, the corrosion rate of rebar HRB400 increases and the corrosion becomes heavier. Meanwhile, the yield strength and tensile strength decrease, but the elongation decreases at first and then increases.

Abstract: The effect of compression storage on adsorption property of silicone rubber in silicone rubber-stainless steel interfacial system and silicone rubber-simulated X material interfacial system was studied in the paper by means of adsorption force testing and SEM statistical calculation method. The results of adsorption force testing indicated that surface roughness, sample type and compression ratio had important influence on adsorption, i.e. smooth surface tend to absorb, which implied that vacuum adsorption might be the main adsorption mechanism for silicone rubber interfacial systems. Plane-type, spherical type and inclinded plane type of samples had different degree of adsorption. Stainless steel interface tended to have larger adsorption than simulated X material interface. Higher compression ratio might lead to higher adsorption force. A SEM statistical calculation method was proposed to estimate the maximum vacuum adsorption force, and the maximum measurement result of adsorption force was approaching to the calculated maximum vacuum adsorption force by the proposed SEM method.

Abstract: Thin films of transparent conducting gallium and titanium doped zinc oxide (GTZO) were prepared on glass substrates by magnetron sputtering technique using a sintered ceramic target. The microstructural properties of the deposited thin films were characterized with X-ray diffraction (XRD). The results demonstrated that the polycrystalline GTZO thin films consist of the hexagonal crystal structures with c-axis as the preferred growth orientation normal to the substrate, and that the working pressure significantly affects the crystal structures of the thin films. The GTZO thin film deposited at the working pressure of 0.4 Pa has the best crystallinity, the largest grain size and the lowest stress.