Advanced Materials Research Vols. 228-229

Abstract: A new kind of correction system with damp-increasing area-changing was analyzed and proposed through analyzing researches of one-dimension trajectory correction at home and abroad. And carried out an analysis of the change and the influence that caused by drag coefficient, lift coefficient with angle-of-attack and wind speed under different area. The mathematical model was proposed between increased drag coefficient and variable area opened by the damper. Feasibility and rationality of the new system were verified by simulation analysis. Furthermore, the damper can open at the right place under the system requirements. By researching aerodynamic characteristics of the projectile fixed this device would promoted the further design of damp-increasing range correction system.

Abstract: The evolution of precipitates size distribution of Ti-IF steel during annealing process has been investigated by simulating different continuous annealing (CA) and batch annealing (BA) treatments. The size and distributions of the precipitates (TiC in particular) are obtained by TEM observation and measured image analysis. They are then fitted by log-normally distribution and a model demonstrating the relationships of particle size distribution with annealing process parameters has been developed and validated by experiment results. The fine TiC precipitates (< 30 nm) vary after different annealing treatments. The effects of annealing temperature and holding time on the evolution of TiC particle size distribution are discussed.

Abstract: This document demonstrates CTOD (crack tip opening displacement) tests at0°Cof welded joint in X80 marine drilling riser in accordance with the BS 7448 standard. The three point bending specimens are made in the weld center line and heat affected zone for the butt-welded joint in Φ533×25.4mm X80 marine drilling riser respectively according to the requirement of the standard. The CTOD testing results are discussed in detail, which can provide the basic to evaluate and optimize the welding and heat treatment technology of marine drilling riser.

Abstract: An original 600MPa high aluminum galvanized dual phase steel had been successfully developed in this paper. The microstructure analysis showed that the microstructures of the steel mainly consist of ferrite and 8%~11% martensite as well as 4%~6% retained austenite which distributed around the ferrite grain boundaries. TEM analysis demonstrated that there exists lots of high density dislocation in ferrite, obvious twin-structures in martensite and some retained austenite in the microstructures. The existence of the retained austenite makes some contribution to the higher elongation of the steel. The tensile test showed that the steel delivers an excellent mechanical properties of Rp0.2=350~400MPa,Rm=610~650MPa, A80mm=26%~30%, n=0.17~0.21 and an excellent bake-hardening value of 50~70MPa. Ball-Punch Experiments showed that the galvanizing dual phase steel had a good and satisfying coating adhesion. Owe to the excellent formability, the steel has successfully been used in the production of some auto parts.

Abstract: The aim of this paper is to research the image recognition system and its applications, which is based on combining the traditional BP neural networks and the third-generation pulse coupled neural network (PCNN).The process is by extracting the image's Euler number sequences, then through the fast Fourier transform, and finally as inputs of the pattern classification. In order to test the stability of the system, we make some varies by rotating, tension and compressing the original image, meanwhile, combined with extracting the features such as time sequence, entropy sequence to do compare, the recognition results is satisfactory.

Abstract: The tunnel in Liangshui goes through bad geological areas, so it makes the construction work difficult. The overall length of the inclined shaft is 372 meters, and the longitudinal slope is 9.28 downgrade. The surrounding rock deformation appears and the vault subsides, and the joist steel deformation and second lined concrete crack happens too, with serious phenomenon of polenta uplift. The reasons for these phenomena are weakness of supporting structure and stiffness and the function of water as analyzed. In accordance with these phenomena, measures such as adding arch frame, grouting small catheter, steel, anchor and increasing shot concrete strength and increasing thickness, as well as making downstream slope, ditch and sink were taken, so as to make sure of the smoothness of the construction work.

Abstract: The priority of traditional tunnel concrete quality testing method is drilling core .The traditional method damage tunnel structure and detection speed is slowly.we use this method cann’t effectively meet the demand of rapid growth of tunnel concrete qulity testing. So the more fast and effective detection methods are needed.A new fast and effective kind of concrete quality detection methods is ground penetrating radar can meet the extensive tunnel concrete nondestructive testing. This paper introduces the basic principle of ground penetrating radar.I illustrate the application of railway tunnel testing by the testing in Ju Gan runnel of Lan Yue railway.TI is significance for railway tunnel concrete in future.

Abstract: The design objective is to satisfy people's needs, improve the quality of life, the pursuit of human, natural and social harmony. This article mainly elaborated the guidance in product design is the natural substance and natural elements, grasping the true feelings, returning to the initial, plain, true desire and behavior, discussing the design idea and method of return to original purity and simplicity, and will be up to a new value of passionate life, natural life and how to achieve certain value and meaning in creative product design.

Abstract: The experiments were carried out upon the determination of simulated heat-affected zone continuous cooling transformation (SH-CCT) diagrams, the characteristics of microstructure and Vickers hardness of SH-CCT specimens, and impact toughness in simulated coarse grain heat-affected zone (CGHAZ) of ship steels under different heat input based on physical simulation. The SH-CCT diagram reveals that bainite is always obtained in a wide range of cooling rates. When the maximum cooling rate reaches 100 °C/s (t8/5=3 seconds), the maximum fraction of martensite (8%) is obtained and the microstructures mainly consist of lath bainite and the hardness is only 255 HV. This demonstrates that the steel has a low quench-hardening tendency and excellent resistance to cold cracking. There are no obvious hardening and softening phenomena in simulated CGHAZ. Test results of impact toughness under different heat input in simulated CGHAZ show that the impact energies reach over 30 J at -40 °C when t8/5 is less than 20 s, meeting the stipulated requirements of ship steel (≥22 J at -40 °C) but no great allowance. Thus, to meet the requirement of properties during welding, it is proposed to choose t8/5 ranging from 5 to 20 s, correspondently the line energies ranging from 14 to 37 KJ/cm for 30 mm thick plate.

Abstract: In the industrial design domain, any choice including the modeling, the material, the processing craft and so on intrinsic factors can entrust the product with different character finally, thus causes it to adapt each kind of different market. In all design method, color design can be called an important link that affect product’s direct-viewing vision effection, the union of the color and the shape constitutes the most main and the most direct part of human vision feeling. The automobile is typical example that melt the modeling and the color together.