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; (4) Therefore, there are two equal and opposite inner tensile stresses, σ13t, symmetrical distributing in the x direction... than a straight line on the meridional plane, which is different from the Mohr-Coulomb yield curve (a six-sided conical surface, shown in Fig. 4(a). In terms of soft (or loose) rock and remolded soil......
on a horizontal spinning machine. A schematic diagram of spinning experiments is shown in Fig. 4. Fig. 4 Metal spinning experiments 2.3 Finite element analysis The metal spinning processes are modelled... and simulated values is about 4%. Deviations within 10% are acceptable. By considering the computational efficiency and precision, the grid density of model (b) is used in the simulation of this work......
As shown in Fig. 4(a), the samples after oxidation under the assigned conditions were inspected by XRD. The sample oxidized at 400 °C for 100 h mainly presented Ti3SiC2 phase. However, it can... for only 1 h. When extending the duration to 10 h, the Ti3SiC2 phase was no more detectable. Fig. 4 XRD patterns of samples oxidized at 400, 600, 800 and 1000 °C in air (a), and measurements of (101......
; (4) 式中:λ为无量纲参数,代表管道直径与颗粒直径的尺寸比；D为管道直径,m.除了λ的影响外,剪切流动区的尺寸δ(m)与颗粒直径d的比值也会影响颗粒在剪切流动区域内的迁移形式与位移量的大小. 同时考虑到雷诺数,宾汉姆数(或Oldroyd数)的影响,粗颗粒-悬浮液的相互作用非常复杂.管道输送过程中粗颗粒与非牛顿悬浮液之间的相互作用力...颗粒与管壁之间的碰撞过程.指定了三个参数:法相恢复系数,切向恢复系数以及摩擦因数来描述颗粒碰撞过程中的动量损耗.综上所述采用宏观颗粒模型与非牛顿流体流变模型对含粗骨料颗粒的膏体充填料浆复合流动进行数值求解,在原理上与技术上均是可行的.MPM模型作为ANSYS Fluent中的UDF模块,可以通过附加模块加载的方式调入Fluent中.其计算原理流程图如图4所示[22]. 2.2 数值计算......
to complete DRX. There were no intermetallics at the welding interface, resulting in a lower hardness. Different DRX behaviors were found between the welding zone and matrix zone in Al-Zn-Mg alloy during... and 1 mm, respectively. Fig. 3 Initial meshes of billet, container, die and extrusion pad (1/8 model) 3 Results 3.1 Microstructure evolution Figure 4 shows the EBSD DRX fraction maps......
in Fig. 4. Fig. 4 Friction coefficient versus sliding distance under load of 3 N As shown in Fig. 4, in all cases, the friction coefficient tends to increase first, then it decreases and stabilizes. This seems to be due to the separation of impurities sticking on the sample surface as well as oxidation of the exposed metal, as mentioned previously [27,31]. It is obvious from Fig. 4......
work-hardening rate have been reported in many layered materials, for example, coarse-/ultrafine- grained copper [23], Ti-Al [24], and coarse-/ ultrafine-grained Cu-Zn [25]. In previous reports, we... Fig. 4 Tensile curves of raw materials The tensile engineering stress–strain curves of the raw materials are shown in Fig. 4. The yield strengths (σ0.2) of the raw Zr702 and CP-Ti are 406......
for the toughness. Thus, it can be seen that the MA and HP for preparing Laves phase NbCr2 alloy is an effective method due to the significantly improving room temperature fracture toughness. 4 Conclusions 1... pressed at 1 250 ℃ for 0.5 h from the 20 h ball milled Nb-66.7Cr powders is about 248 nm, which reaches the sub-micron level. 4) The Laves phase NbCr2 alloy......
electrode. Fig.8 Typical impedance spectra of γ-Mo2N electrode in 1 mol/L H2SO4 4 Conclusions 1) Uniform nanoparticles of γ-Mo2N with a narrow size distribution... Growth, 2006, 297(2): 387-389. [4] LIU Kai-yu, ZHANG Ying, ZHANG Wei, ZHENG He, SU Geng. Charge-discharge process of MnO2 supercapacitor [J]. Trans Nonferrous Met Soc China, 2007, 17(3): 649-653. [5......
that estimated using X-ray diffraction, but on the same order. Such discrepancy between the average grain sizes determined by the two techniques has been noted before[15]. 4 Discussion 4.1 Thermal stability..., 46(1/2): 1-184. [3] BENSON D J, FU H H, MEYERS M A. On the effect of grain size on yield stress: Extension into nanocrystalline domain [J]. Mater Sci Eng A, 2001, 319/321A: 854-861. [4] WANG Yin......
