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次分析法；模糊数学A fuzzy AHP approach to select supporting schemes for city foundation pit in soft soilZHOU Han1, 2, CAO Ping1(1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. Yunnan Copper Group Company Ltd., Kunming 650051, China)Abstract:To select the rational supporting schemes of city foundation pit in soft soil region, a fuzzy analytic hierarchy......
words: pre-corroded aluminium alloy; corrosion pit; crack propagation; life prediction; fatigue limit 1 Introduction Aluminium alloys are widely used in military and aerospace industries owing... the corrosion pit as a semi-elliptical surface crack, which changes with the pre-corrosion time. In this work, the sizes of equivalent cracks were controlled by the data of short crack propagation......
Dynamic phase-mining optimization in open-pit metal mines GU Xiao-wei(顾晓薇), WANG Qing(王 青), GE Shu(葛 舒) College of Resource and Civil Engineering, Northeastern University, Shenyang 110004, China Received 12 July 2009; accepted 11 September 2010 Abstract: Three important aspects of phase-mining must be optimized: the number of phases, the geometry and location of each phase-pit (including......
that the application of horizontal magnetic field of 0.4 T would increase the pitting corrosion potential(Epit),decrease the corrosion current density(icorr),prolong the pit initiation time,slow down the pit generation rate and inhibit the growth of pitting of the tested alloys in 3.5 wt% NaCl solution.The applied magnetic field would also change the mechanism of pit initiation of Al-3.0 wt%Mg alloy......
" name="ChDivSummary">To indirectly investigate the dislocation behavior of Fe-36wt%Ni Invar alloy by the etch pit method,polished Invar specimens were etched by a solution containing 4 g copper... to the grain orientations.These etch pits were characterized as dislocation etch pits.It was observed that etch pits arranged along grain boundaries,gathered at grain tips and strip-like etch pit......
with the available test data. The results suggest that the combination of a pit and IDS can be treated as the initial crack size. Pitting corrosion causes a significant decrease in fatigue lives with small corrosion depths. But the effect of pit on fatigue life is gradually reduced with increasing pit size. A pit with a constant depth can be applied to the model for long exposure structure. A preliminary......
NUMBER METHOD FOR DESIG-NING OPENPIT LIMITS冯仲仁,石忠民摘 要:<正>This paper analyzes the basic characters ofoptimum open-pit limit.According to them,following gener-al rule for designing pit limit is obtained.The incrementalstripping ratios is not greater than the break-even strippingratios,or the net incremental value is not less than zero.Therule can......
(FE-SEM).A novel model was proposed to describe the morphological evolution of tunnel tips throughout the growth processes.In the pit nucleation stage,the pits vary from the hemispherical to half-cubic shapes due to the activation of pit tips from the center to the edge.During the tunnel growth stage,the pits dissolve toward the depth direction and develop into the tunnels,and their tips remain......
lower than that of 316 L.Hydrolyzation of tin ions induces more metastable pit occurrence on the material surface. However, the pitting resistance of B316 LX increases because tin oxides improve the density and uniformity of the passive film, and hydroxide and oxide of tin inhabit the process of pit growing. The effect of tin on pitting corrosion process is illustrated schematically.关键词:......
">The corrosion behavior of 304 stainless steel(SS) in the presence of aerobic halophilic archaea Natronorubrum tibetense was investigated. After 14 days of immersion, no obvious pitting pit was observed on the SS surface in the sterile medium. By contrast, the SS exhibited serious pitting corrosion with the largest pit depth of 5.0 μm in the inoculated medium after 14 days. The results......
