Advanced Materials Research Vols. 602-604

Abstract: Modern 9-12%Cr steels are widely used for steam turbine components. For the design optimization and lifetime estimation of steam turbines, it is very important to investigate and describe the deformation as well as crack initiation behavior at critical location of steam turbine components under multiaxial service-type loading conditions. In this paper a phenomenological lifetime estimation method was validated by multiaxial loading. The applicability and reliability of this lifetime estimation model was confirmed by a recalculation of biaxial creep fatigue tests performed on cruciform specimens of rotor steel X12CrMoWVNbN10-1-1 successfully.

Abstract: Up to now lots of CNC system used traditional DOS to realize real time control by hardware interrupt programming. To make computer numerical control system flexible and open can meet requirements of higher real-time. This paper used ARM9 processor S3C2410A with the RISC system of SAMSUNG Company, and realized precise interpolation of NC interpolation by the way of software on EVC platform with the aid of WinCE OS. Coupled with the motor drive module, it can achieve a simple NC function of four quadrant arc interpolation will be realized by programming used by point-by-point comparison method.

Abstract: In this paper a high-performance single level uncooled microbolometer detectors with a unit cell size of 25um×25um is introduced. An efficient detectors requires low Noise Equivalent Temperature Difference(NETD) (<80mK,f/1,60Hz)and low thermal time constant (<8.3ms). The trade-offs between physical parameters are studied to attain the optimum design parameters including the thermal conductance, the thermal time constant and the active area, consequently, optimum design parameters such as the width and the length of the support arms, which can satisfy the demand of an efficient detectors is achieved.

Abstract: The erosion resistance evaluation of coating has important academic significance as well as project application value. Being the traditional way, the direct comparison method requires large amount of trivial work. By taking different coatings as clustering objects and data obtained from coating in erosion experiments as clustering index, this paper, on the other hand, defines the whitenization weight function of the index with grey clustering method, and has in this way built the grey clustering mathematical model of coating erosion resistance evaluation. As is proved in practice that the model makes it possible to evaluate the erosion resistance of coating scientifically, making the evaluation more reasonable and objective. At the same time, due to the accurate evaluation results, it avoids the subjectivity and one-sidedness otherwise being unavoidable for judging by experience. The coating erosion resistance experiments do not have strict demands for data volume, which makes the evaluation process both simple and scientific.

Abstract: This paper experimentally examined the impact of four different drying methods (free drying, press drying, vacuum drying and impingement drying) on paper physical properties including roughness, elongation, air permeance, tearing resistance, tensile index and bursting strength. The handsheets materials are HWBKP (Hardwood Bleached Chemical Pulp), SWBKP (Softwood Bleached Chemical Pulp), CTMP (Chemical Thermo mechanical Pulp) and ATMP (Advanced Thermo Mechanical Pulp). Good experimental data were obtained for the four pulps under different drying conditions. The results of our investigation indicate that press drying have lower surface roughness, elongation and air permeance but higher tearing resistance; the vacuum drying have higher roughness, tensile index and bursting strength; the impingement drying have lower tearing resistance, tensile index and bursting strength but higher elongation and air permeance. Selection of different drying conditions for effective productivity and quality improvement potential is proposed as a direction for the future dryer design.

Abstract: As a new process, the abrasive belt grinding plays an increasingly important role in the field of machining. It meets a variety of processing requirements. The concept of abrasive belt grinding and its working principle were introduced, and a new type of abrasive belt grinding equipment for removing the rust on steel wire surface was designed. Some key experiments for testing grinding force，the metal removal rate，belt wear rate、grinding ratio，grinding depth and wire speed were studied. The research work provides rational parameters for the pretreatment of rust removal in metal wire drawing processing.

Abstract: The effect of the adhesive thickness on the impact toughness of the adhesively bonded steel butt joint during Izod impact test and the failure procedure is studied using the finite element method software ABAQUS. The results obtained show that the time with the peak stress Seqv occurred is corresponding to the element failure. And much higher peak stress might be subjected by the element near the bottom of the joint under impact load. The failure time of the element becomes little longer when the adhesive layer thickness increased from 0.1 mm to 0.4 mm. But the peak value of the Seqv decreases and the damage limit of the strain increased evidently as the adhesive thickness increased from 0.2 mm to 0.4 mm.

Abstract: Sheet metal is used widely, but the defect inside the sheet metal will affect the use security. Ultrasonic lock-in thermography as a nondestructive testing method can be used in defect dectection. This paper, focusing on the Q235 sheet metal, regards the heat conduction process as sound-machine-thermo energy coupling process, establishes the finite element simulation model, and experiments are performed to validate the built simulation model. The result shows ultrasonic lock-in thermography is fit for testing inside defects of sheet metal.

Abstract: A microwave technique assisted with granular active carbon(GAC) was used for the degradation of p-nitrophenol(PNP) wastewater. The effective factors such as the initial concentration of PNPl, active carbon dosage, microwave power and irradiation time on the degradation rate were studied. When the concentration of PNP was 200 mg/L, active carbon dosage was 6 g/L, microwave power was 500 W, and irradiation time was 8 min, the removal ratio of PNP reached 99. 03%. The concentration o f PNP could be decreased to be low 2 mg /L, which satisfied with the national first degree let out level. The results show that the technology can be a practical and effective method for treating PNP organic wastewater.

Abstract: Durable press (DP) finishing is the common process to impart anti-creasing properties to cotton fabrics. Conventionally, the whole fabric was treated by pad-dry-cure (PDC) process in one treating bath. However, this process led to the serious loss of the cotton fabrics in mechanical properties. In this work, the cotton yarns were treated with DP finishing solution. And subsequently, they were dried and cured in a certain temperature. The wrinkle recovery angle (WRA) of yarns was measured. The relationship between the treating process and WRA was studied. The affecting parameters on WRA were acquired by experiment. This work provides basic data for people to know and understand the role of anti-creasing yarns in the whole fabric.