Applied Mechanics and Materials Vol. 487

Abstract: The new moment augment factor of column of the national Code for Seismic Design of Buildings (GB500112010) were increased, the strong column weak beam reliability of reinforced concrete structure were improved, at the same time, the cost of building were improved also. Influence of moment augment factor column on building cost was discussed by computer design software Guang Sha CAD. Result indicates that the increase of cost is very small.

Abstract: In order to examine if the lead-in threaded devices can replace the traditional threaded devices in practical production, this paper primarily studies the structure and material of the lead-in threaded devices by analyzing its performance, the cleanness, mechanical properties and appearance of raw silk it produces, and by comparing it with traditional threaded devices. The experimental result shows that the lead-in threaded devices performance and the cleanness and mechanical properties and appearance shape of its raw silk are superior to the traditional threaded devices, it can completely replace the traditional threaded devices in process effects in actual production.

Abstract: The versatility of ship is reflected in the modularization design. On the basis of summarizing the module and modular theory, the modularization design concept is applied to the design procedure of ships. This paper studied the impact of modularization on the ship general design, proposed an idea of functional areas. According to the different tasks, the light ship can be divided into three types: civilian type, guard type and military type.

Abstract: With the development of Radio Frequency Identification technology in recent years, it has been successfully applied to all areas of life. This article mainly elaborates the concept of RFID, system components, tracking and detection of machining processes and some other applications workshop production and management. It also puts forward the problems of RFID in machining and the application of RFID in machining for further prospects.

Abstract: The material dispersion of structure led to a lager error in crack length evaluating, the assessment method utilizing Gaussian Process (GP) model was proposed to solve the problem. The fatigue crack was monitored by active Lamb monitoring technology, and the four damage indices were extracted from the measured sensor signal, and then inputted to the GP model to realize the online evaluating of crack length. The fatigue test of hole-edge crack was made in LY12-CZ Aluminum specimen, which was used in aerospace structures frequently, the results shows that the method could efficiently decrease the evaluation error of crack length, which caused by material dispersion of structure.

Abstract: This paper study on the permeability, start-up pressure gradient and stress sensitivity of advance water injection in extra-low permeability reservoir in Fuyu Oil layer of Daqing Oilfield. Experimental results show that the reasonable formation pressure level should be at about 120% in the advance water injection experiment, advanced water injection in the the early stage have higher oil production, the water breakthrough, earlier than synchronous water injection has certain inhibitory effect of water cut rise; Under the premise of advance water injection can overcome the start-up pressure, the lower the level of the reservoir permeability, the higher improve recovery efficiency of the proportion; permeability retention rate increase by about 22% with 5×10^-3μm² core and effectively overcome the stress sensitivity of low permeability reservoir damage; Advanced water injection can overcome stress sensitivity and restoring formation pressure, all that influence the start-up pressure gradient, which significantly reduce the start-up pressure gradient.

Abstract: For diameter being about 0.5mm, by means of the cutting mechanism of grinding & the virtue of supper hard abrasive grinding. It is achieved that the mini hole is machined in some difficult cutting material. The basic require of abrasive arranged on the end of the grind-driller, the method of cutting in the center of the drill, the mechanism of forming round hole are analyzed, The problems of grinding chip removing & stopping up are explored. The theory foundation is supplied to grind-drill small hole.

Abstract: As the world of semiconductor is moving towards smaller and high-end applications, the quality of the bonding adhesion for wire bonding is very critical. Although aluminium has been the metallization of choice in integrated circuits, it can be easily oxidized during high temperature and pressure. On the other hand, Platinum metallization layer has high thermal coefficient resistance and inert to oxygen. This paper reports the correlation between surface roughness and the wettability in the form of contact angle for Platinum deposited wafer etched using Inductively Couple Plasma-Reactive Ion Etching (ICP-RIE). Surface roughness was measured using AFM while contact angle was obtained via droplet test. The results clearly suggested that both surface roughness and wettabily, calculated by its contact angle value has the same trend. Surface roughness is directly proportional to the contact angle. This indicates that surface roughness have great influence on the surface wettability. Therefore, the adhesion for wire bonding process on platinum metallization which can be used in high end applications can be controlled by its surface roughness and wettability.

Abstract: As a derivative parameter of the structural displacement mode, damage factor matrix was adopted to investigate the detection of structural crack location and damage. A methodological strategy by combination of the damage factor matrix and the wavelet multi-resolution analysis is presented in the paper, in order to identify structural damages of the cantilevered beam. The results show that damage can be identified by the damage factor matrix and the wavelet multi-resolution analysis, and the damage degree can be estimated by damage frequency band energy of the wavelet analysis. A reference to damage identification in current structure engineering is provided.

Abstract: Based on the random vibration theory, fatigue strength theory and Miner cumulative damage theory, the formulas for estimation of fatigue life which can be coped with narrowband and broadband random vibration was derived by the peak distribution function. The power spectral density function of axle structure is deduced after the power spectral density of standard road and the vibration model of wheel had studying. Combined the power spectral density function with broadband random vibration fatigue life estimation formula, the fatigue life of axle structure was obtained. This method is simple and has a strong engineering practicality.