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标志码:A 文章编号:1672-7207(2012)08-3200-09 Elastoplastic damage model of rock based on micro-crack propagation under compression YUAN Xiao-ping1, LI Bo-tao2..., China University of Geosciences (Beijing), Beijing 100083, China) Abstract: A micro-crack elastoplastic damage model under compressive loading was presented. The propagation of wing crack in the micro......
Nonlinear ultrasonic characterizing online fatigue damage and in situ microscopic observation WU Bin1, YAN Bing-sheng1, 2, HE Cun-fu1 1. College of Mechanical Engineering and Applied Electronics...; accepted 16 May 2011 Abstract: A robust experimental procedure was developed, by which the evolution of fatigue damage in AZ31 magnesium alloy was tracked online with the ultrasonic nonlinearity......
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the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2D was used to simulate the triaxial test to study the influence... by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under......
and cyclic dynamic disturbances is a key factor influencing the stability of deep rock engineering. Mechanical experiments of marble collected in a deep mine under high stress and circle dynamic... relation with the number of cyclic dynamic disturbance; with the increase of the number of cyclic dynamic disturbance, the irreversible deformation and damage go through a process of increasing sharply......
, the factor analysis method has been used and the influence factors on the ECC in the economic transition have been gained. The results show that factors of ECC in the three subsystems have different...: economic transition; ecological carrying capacity (ECC); factor analysis; Chinese western region; environmental engineering 1 Introduction Economic transformation in our country is an effective......
-strain curves. The damage of two kinds of fiber content concrete after different impact speed was observed and the mechanism of damage evolution and the effect of different strain rate and fiber contents on the damage were analyzed by means of the microscope. The constitutive model of PFRC was obtained based on the introduction of damage viscoelastic constitutive model and analysis of test results......
is in a state of plane strain. The crack propagation rate as a constant speed, the stress intensity factor on the crack tip and the threshold stress intensity factor for the stress corrosion cracking... chloride. Key words: aluminum alloy containing scandium; stress corrosion cracking; intensity factor ......
and damage- induced permeability changes. According to the current studies, it is concluded that the damage induced crack growth is the important factor leading to the variation of rock permeability, which... in complete creep processes of rock is not a constant, but is a function of rock creep strain, confining pressure, damage variable and pore water pressure. The results can be considered to provide......
Radiation Damage and Recovery in Neutron-Irradiated MgO Crystal Ruan Yongfeng1,Liu Jian1,Ma Pengfei1,Liu Changlong1,Li Wenrun1 (1.School of Science, Tianjin University, Tianjin 300072, China) Abstract:MgO single crystal was irradiated by neutron up to a dose of 5.74×1018 cm-2. The radiation damage and its recovery were studied by means of UV-VIS and EM spectroscopy. The results indicate......
