Papers by Keyword: Influence Factor

Abstract: Corrosion of oil country tubular goods not only causes huge economic loss, but also brings serious environmental pollution. Stress corrosion cracking of oil country tubular goods in the sulfur-containing environment is the principal corrosion failure form in the exploitation of oil and gas process. Therefore, extensive investigations on hydrogen sulfide corrosion of steels for oil country tubular goods have been carried out. The aim of this work is to review the research progress on the hydrogen sulfide corrosion performance of steels for oil country tubular goods. The influence of alloy elements, defects, environmental factors and mechanical factors on hydrogen sulfide corrosion resistance of steels for oil country tubular goods were discussed. The future work in hydrogen sulfide corrosion performance of oil country tubular good and new sulfur-resistant steels for oil country tubular goods development were prospected.

Abstract: The current research status of reheat crack in welded joint of low alloy heat-resistant steels are outlined. Some new phenomena discovered in engineering in recent years are summarized, and related problems that remain to be studied are also presented. Reheat crack in welded joint is occurred frequently during postweld heat treatment (PWHT) or in service at elevated temperature. Mainly four mechanisms leading to reheat crack, respectively, impurity segregation grain boundary weakening, precipitation hardening, creep rupture and no-precipitation zone weakening have been generally accepted now. Several essential factors consist of parent material chemical composition, microstructure and thickness of welded joint, filler material, preheat and postheat procedures, welding energy input, PWHT parameter, and stress and strain and so on. Theoretical calculation methods, criterion of RoA (Reduction of Area) and several experimental methods are put forward to evaluate reheat crack susceptibility. Based on new issues emerged in engineering, problems of concerning reheat crack are necessary to be researched, which include at least mechanism and influence factors of new multi-element composite strengthening heat-resistant steels, the mitigation measures for increasing wall thickness weldment, the root cause analysis and prevention methods of conventional low alloy heat-resistant steels for long term service.

Abstract: The concrete column with reinforcing bars in core refers that allocate longitudinal reinforcement and stirrup in the core area of the cross section of the concrete column. In this paper, a normal concrete column and a core reinforcement column are analyzed. In the same conditions (the same material, the same section and slenderness ratio) the cross section is analyzed by Xtract cross section analysis software. Through comparison and analysis of the yield surface curve and curve of moment-curvature, it can be drawn that: compared to normal concrete column, the core reinforcement column can significantly improve the bearing capacity and deformation capacity of the whole column; if the volume stirrup rate and the longitudinal reinforcement ratio of the core area increase, the range of the yield surface curve of the column will grow, the bearing capacity of the component will increase. As for seismic design of short columns under high axial pressure, it has a good engineering significance for improving the load-carrying and deformation ability of the short column and meeting the requirements of seismic design.

Abstract: The microstructural evolution of the high Nb X80 pipeline steel in Continuous Cooling Transformation (CCT) by Gleeble-3500HS thermal mechanical simulation testing system was studied, the corresponding CCT curves were drawn and the influence of some parameters such as deformation and cooling rate on microstructure of high Nb X80 pipeline steel was analyzed. The results show that as cooling rate increased, the phase transformation temperature of high Nb X80 steel decreased, with the microstructure transformation from ferrite-pearlite to acicular ferrite and bainite-ferrite. When cooling rate was between 20°C/s and 30°C/s, the microstructure was comparatively ideal acicular ferrite, thermal deformation accelerates phase transformation notably and made the dynamic CCT curves move upward and the initial temperature of phase transformation increase obviously. Meanwhile the thermal deformation refined acicular ferrite and extended the range of cooling rate accessible to acicular ferrite.

Abstract: Wire electrical discharge machining is a machining method by which parts having various contours could be detached from plate workpieces. The method uses the electrical discharges developed between the workpiece and the wire tool electrode found in an axial motion, when in the work zone a dielectric fluid is recirculated. In order to highlight the influence exerted by some input process factors on the surface roughness parameter Ra in case of a workpiece made of an alloyed steel, a factorial experiment with six independent variables at two variation levels was designed and materialized. As input factors, one used the workpiece thickness, pulse on time, pulse off-time, wire axial tensile force, current intensity average amplitude defined by setting button position and travelling wire electrode speed. By mathematical processing of the experimental results, empirical models were established. Om the base of a power type empirical model, graphical representations aiming to highlight the influence of some input factors on the surface roughness parameter Ra were achieved. The power type empirical model facilitated establishing of order of factors able to exert influence on the surface roughness parameter Ra at wire electrical discharge machining.

Abstract: Many Factors influencing the testing accuracy are discussed according to the differences between the testing data of most of the domestic anti-force rolling brake testing platform. We try to get the theoretical analysis and be proved by experiment through the mechanical model. We focus on some respects just as attachment coefficient, tire pressure, vehicle moving and direction displacement which influencing the testing accuracy of the anti-force rolling brake testing platform.

Abstract: This paper analyzes the kinds of freeway traffic incident and influences on traffic flow of recurring traffic incident and non-recurring traffic incident. It is full of interest and very useful. By using the traffic simulation software TSIS(Traffic Software Integration Systems) to obtain correlation traffic data which is needed when researching, then study and analyzes how to choose traffic parameters which are mainly traffic low speed, occupancy and lane occupancy of traffic incident detection. After analyzing the simulation data, we can find that it is more reasonable that choosing the vehicle lane occupation rate as detection parameter of traffic incident.

Abstract: In order to realize the real-time and effective supervision ofconstructors’unsafe behavior, we put forward to apply RFID technology to thereal-time supervision of unsafe behavior.According to the analysis of factorsthat influence constructors’ unsafe behavior in the process of theconstruction, using the functionof RFID technology for information storage andreal-time location,so as to build subsystem based on static factors andsubsystem based on dynamic factors. We apply this system to realize real-time supervisionof constructors’ unsafe behavior.This technical method solves the deficiency oftraditional management methods ignoring constructors’ internal factors and letsreal-time supervision come true. In the end,it could improve safety managementperformance in construction site.

Abstract: In order to recognize andvalue the comprehensive benefits of decentralized waste water treatment andreuse project in the hotel,according to the water balance in the process ofreclaimed water reusing, determined its structure and content elements with theview of system theory, pointed out the influence factors of water balance, combinedwith the example, the entropy weight method is used to analyse and calculate theweight of influence factors, got the main reasons for system water imbalance, providedsome advice for the investment and configuration of the reclaimed water reusein the hotel.

Abstract: As the steady and rapid economic growth aggravates the power supply and demand situation, it is necessary to analyze the influence factors of power consumption and establish prediction mechanisms for the power demand by the basic change law, aiming to promote the development of electric power. This paper conducted grey relational analysis for the power consumption from 1991 to 2012 and the relevant data of influence factors, including GDP, industry structure, and population and so on. Based on the above results, it explored various influence factors at different periods, then adopted the GM (1, 1) model to carry out gray prediction for the power consumption from 2013 to 2020 as well as the corresponding influencing factors, and finally analyzed the prediction results.