Advanced Materials Research Vols. 712-715

Abstract: The Broyden method for the numerical calculation of Moment-Thrust-Curvature (M-P-Φ) relationship of beam-column is put forward, which is suitable for all combinations of moment, thrust and curvature considering the effect of residual stresses. The relationship problem is simplified as two nonlinear equations of four variables. When two of the 4 variables are given, the relationship can be obtained by Broyden method. The advantages of Broyden method are discussed and the iterative calculation process is listed. The method offers significant improvements in accuracy, robustness and calculation amount of the solution, which can be used for beam-columns with any type section.

Abstract: The development of computer technology has provided advanced methods for the analysis of complex mechanics problems. Along with the enhancement of computer speed, the computational time used in a finite element analysis is reduced significantly. The main work in a pre-bucking finite element analysis will concentrate on structuring the analytical model and the software model. A normalized factor of the normalized determinant DET of stiffness matrix is defined in this article.The finite element analysis model used in the pre-bucking analysis of laminated composite plates and shells is presented based on the characteristic of the DET. An algorithm for controlling computational procedure and determining critical load is also presented. Numerical examples are given to validate the proposed method and satisfactory results are obtained.

Abstract: A large-scale forklift's wheel rim appeared cracking phenomenon in the course of use. This article summarized and analyzed force of the forklift's wheel rim according to the typical working conditions of forklift, and calculated the load of various working conditions. It provided the correct boundary conditions for the finite element analysis of the wheel rim [. After the analysis of wheel rim's three typical conditions, found the weak parts of the structure of the rim, and this part was consistent with the feedback part, so it proved correct of the finite element analysis model. Clever was used ribbed-plate and punching groove to strengthen the weak part of wheel rim and the finite element model was used to calculate and check the improved wheel rim again. The results showed that the improved wheel rim stress decreased quite, so the measure was correct.

Abstract: Based on the Gurson-Tvergaard-Needleman micromechanical damage model, taking void growth ratio V_G as the damage variable established acoustic emission (AE) quantitative evaluation model. Taking steel 20 notched bar specimens tensile process as example, get AE information from yield to fracture process. Using ABAQUS analyzed the meso-damage process during tensile process of the specimens, and get the numerical solution of meso-damage parameters. Based on AE testing and the results of Finite Element Simulation, established the quantitative evaluation formula of V_G and AE cumulative hits N during 20 steel notched specimens tensile process. Result shows that, 20 steel from yield to fracture damage, the relationship between N and V_G is divided into two stage, namely linear damage stage and nonlinear damage stage. When the N reaches 61, the material is at the transition stage from linear damage stage to nonlinear damage stage.

Abstract: Established a cross-validation of the model optimization algorithm in order to predict the corrosion rate of the grounding grid. Forward neural network input variables by principal component analysis to extract the main element, eliminating the correlation between variables; cross-validation method and change the termination of the neural network training conditions, the selection of network training model. The final simulation results show that, get a good grounding grid corrosion rate stability and generalization performance optimization prediction model can predict the corrosion rate of the grounding grid.

Abstract: For natural gas well in sour gas reservoirs, very serious corrosion in the completed well system is an important factor of gas production system life. In order to ensure the long-term development of gas wells, this paper mainly introduces material corrosion prevention technology in the completed well system, such as corrosion-resistant alloy steel corrosion control technology, bimetallic combination tubing, corrosion inhibitor technology and so on. By taking LJ Gas Field as an example, this paper introduces the material corrosion prevention technology in the completed well system in LJ Gas Field. For application in the completed well system in LJ Gas Field, the technology above have good performance of corrosion resistance.

Abstract: Aiming at the problem of the engineering drawing after generating from parametric design including unreasonable layout, disharmonious proportions and nonstandard labeling, with VB6.0 software for the tool, combined with the Access database, the paper proposes the method of engineering drawing automatic adjustment. It realizes automatic adding of the project chart attribute, automatic adjustment of view scale, view position, annotation position and generating of material list automatically. Through this technology, it can develop automatic system of adjusting engineering drawing, which greatly improves the efficiency of parametric design and applying to actual production.

Abstract: Parametric design is one of reliable and effective modern mechanical design technologies. The process of 3D parametric design system of worm gear was developed to aim directly the character of worm drive. Establishment of CAD model of worm gear, design and calculation of parameters of worm drive and the output of design documents and drawings were solved based on the secondary development for Pro/E. Then a relative example is given to prove its feasibility and efficiency. The operation result show design efficiency of worm gear is enhanced greatly by using this 3D parametric design system, which meets the needs of modern mechanical design. This study also provides a reference to 3D parametric design for other parts.

Abstract: A kind of calculating model was proposed according to the structure and load characteristics of push-back rack. On the basis of study on modeling and analysis technology using ANSYS, the finite element analysis of push-back rack was realized, which can provide reference to the design and calculation of push-back rack.

Abstract: According to different diameter of shaft, sleeve thickness, contact length and groove width, various FEM contact analysis calculations were carried out by orthogonal test method in two states -the initial state and the pressurized state- at the oil groove. Then, regression analysis method is applied for data processing to the total deformation and different positions of axial, radial deformation about the model. The analysis result shows that hydraulic dismantling feasibility can be achieved under the precondition of ensuring the strength requirements.