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damage, while the dynamic collapse is caused by adiabatic shear localization. Furthermore, the shear zone approximately keeps a constant width, the width of shear zone continually narrowdown from... titanium alloy; quasi-static; dynamic; crack; adiabatic shear band; shear zone 钛及钛合金具有密度小,强度高以及无磁性的特点,在军工领域有广泛的应用价值.钛及钛合金具有较高的强度和较低的热传导率,高应变率加载时,容易产生绝热剪切带,是研究绝热剪切带形成较为理想的材料.NEMAT-NASSER等[1],CHICHILI等[2......
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University of Technology, Wuhan 430070, China) Abstract: Ion transport property of ultra low ion permeability cementitious materials (ULIPCM) was investigated by accelerated diffusion method, and the microstructure of ULIPCM was investigated by microhardness, MIP and SEM-EDXA. The structure model of interfacial transition zone between aggregate and cement paste of ULIPCM was put forward......
Identification and control of friction parameters and dead zone parameters of pneumatic servo system MENG Fangan, TAO Guoliang, WANG Bangmeng, TAO Jun, CHEN Ye (State Key Laboratory of Fluid Power &..., a method of parameter identification based on genetic algorithm for LuGre friction model of pneumatic cylinder and a method of dead zone identification for proportional directional valve were proposed......
; 文献标志码:A 文章编号:1672-7207(2019)03-0596-11 "Sweet spots zone" optimization of marine shale gas in complex geological... shale gas were conducted, and the evaluation parameter system of "sweet spots zone" in the complex geological conditions outside the Sichuan basin was proposed. Boundaries and weights were also......
coatings at Qingdao test station(Ⅰ)-Immersion zone LI Yan1, XING Shao-hua1, LI Xin2, WEI Xu-jun2 (1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. School... to immersion zone of Qingdao site was investigated with seawater corrosion test, microscopy morphology analyses and electrochemical measurements. The inferior performance of GI mainly results from its largest......
. Prolonging isothermal holding at 415 ℃ results in coarser and more spaced η phase particles at grain boundaries with wider precipitates free zone, and lower density of larger η′ hardening precipitates... leads to fewer η′ hardening precipitates inside grains, larger and more spaced η phase particles at grain boundaries and wider grain boundary precipitates free zone after aging. Key words: quenching......