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with the monolayer board sound insulation theory. The sound reduction index(R) increases with the even growth of thickness and density, but its rising trend is tempered. The single number sound reduction indexes(RW) of specimen with thickness of 20 cm and density of 0.51 g/cm3 are 30.8 dB and 33 dB respectively, which demonstrates good sound insulation property for lightmass materials. Key words: Al-Si......
Thickness effects on corrosion and wear resistance properties of micro-arc discharge oxide coatings on AZ91D magnesium alloys HUANG Wei-jiu(黄伟九), LIU Ming(刘 明), LI Zhao-feng(李兆峰), ZENG Rong... coatings with difference thickness were synthesized on AZ91D magnesium alloy. The microstructure and phase structure of the coatings were analyzed using SEM and XRD, the tribological properties......
A new method determining safe thickness of karst cave roof under pile tipJIANG Chong(蒋冲), LIU Lang(刘浪), WU Jun-ping(吴均平)(School of Resources and Safety Engineering, Central South University, Changsha... and shells, the simplified model is calculated and the theoretical calculation formula to determine the safe thickness of cave roof under pile tip can be obtained when the edges of the cave roof are simply......
thickness is 10 mm 表1 不同平均粒径在3种初始料层厚度条件下的临界流化速度 Table 1 Critical fluidization velocity of coal with different particle diameter when originality material thickness is different ... to pressure on the bed and the bed height of the impact were obtained. The critical fluidizing velocity was given. The relationship between the critical fluidizing velocity and particle diameter......
Effect of internal pressure distribution on thickness uniformity of hydroforming Y-shaped tubePENG Jun-yang1, ZHANG Wen-da1, LIU Gang1, ZHU Shi-qiang2, YUAN Shi-jian1(1. National Key Laboratory... two projects with traditional punch and multistage punch were applied to comparison. The thickness distribution and thinning ratio distribution were investigated, and the results by different punches......
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J. Cent. South Univ. (2012) 19: 572-577 DOI: 10.1007/s11771-012-1041-2 Critical weight on bit of double-driven bottomhole assembly during vertical and fast drilling ZHU Xiao-hua(祝效华), JIA Yan-jie(贾彦杰... the critical WOB was established. By comparing the model predictions with the measured hole angle changes in the field, the results show that the model predictions are accurate with error less than 5.8......
A strip thickness prediction method of hot rolling based on D_S information reconstructionSUN Li-jie(孙丽杰)1, SHAO Cheng(邵诚)1, ZHANG Li(张利)2(1. Institute of Advanced Control Technology, Dalian University of Technology, Dalian 116024, China;2. School of Information, Liaoning University, Shenyang 110036, China)Abstract:To improve prediction accuracy of strip thickness in hot rolling, a kind......
: critical dynamic stress; dynamic shear strain threshold; dynamic stability; replacement thickness; red clay; cutting bed; ballastless track 武广客运专线是我国第1条全长无碴轨道高速铁路,设计时速达350 km.列车速度的提高和无碴轨道的采用对铁路基床的强度及变形要求越..., Yueyang 414000, China) Abstract: Based on field dynamic response testing results and the critical dynamic stress and fatigue dynamic shear strain threshold obtained from fatigue test indoor......
with the calculated critical cooling rate. Fig. 7(b) shows the temperature distribution of Mg80-xCa5Zn15+x (x=5 to 20) alloys with pouring temperature of 736 K, casting speed of 3 m/min, strip thickness...Trans. Nonferrous Met. Soc. China 27(2017) 2406-2414 Simulation of critical cooling rate and process conditions for metallic glasses in vertical type twin-roll casting Zhi-pu PEI1, Dong-ying JU2,3......
