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; blast disturbance; lateral pressure coefficient; acoustic emission; power-law fitting 1 Introduction Under high in-situ stress conditions, in the mining process, rock masses are inevitably subjected..., and displacement 4.1 Spatial evolution of AE events Table 3 Parameters values of AE activity power-law fitting after each blast disturbance Before the AE source location, the P-wave arrival time......
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; Fitting methods for relaxation modulus of viscoelastic materials DUAN Ji-an(段吉安), YANG Cheng-ling(杨成林), SHUAI Ci-jun(帅词俊) (School of Mechanical.... The computational methods for the Maxwell model fitting were achieved in MATLAB software. It is found that fitting precision of the two methods is very high. The method of solving linear equations needs more......
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the difficulty of creep data fitting when power-law breakdown appears in high strength aluminum alloy. The 7075 creep data were fitted into different rate temperature parameter models to obtain... alloy in experimental conditions can be well described by creep constitutive equations of RMB’ and MH’ models. Key words: rate temperature parameter; high strength aluminum alloy; power-law breakdown......
Iterative circle fitting based on circular attracting factorWANG Heng-sheng(王恒升)1, 2, ZHANG Qiang(张强)1, WANG Fu-liang(王福亮)1, 2(1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory for High Performance Complex Manufacturing (Central South University),Changsha 410083, China)Abstract:An intuitive method for circle fitting......
(1) 式中:τ为剪切应力,Pa;c为幂律流体黏度系数,Pa·s;γ为浆液剪切速率,s-1,γ=-dv/dr;v为流速;n流变指数. 图1 水泥浆液稠度流变曲线 Fig. 1 Rheological curve of cement slurry consistency 表1 水泥浆液幂律方程拟合 Table 1 Power law equation fitting of cement...管流动示意图 Fig. 5 Schematic diagram of capillary flow of power law fluid 在不考虑重力的情况下,流体柱受力满足以下平衡关系: +2(11) 式中:p与p+dp分别为微元流体柱段dl的左端压力与右端压力;为微元流体柱面剪应力. 由式(11)推出流体外表面所受剪应力为 (12) 式(12)表明剪切应力τ与毛细管内径径向距离呈正比,在管壁附......
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with decreasing the grain size at high strain rates and decreases with decreasing the grain size at low shear rates. Several fitting equations were obtained by using the power law equation, and the method... as (6) This method just uses a hypothesis of a same power-law index to obtain unknown fitting equations, and it contributes......
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