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steel rollers, with a width of 1/10 of the specimen diameter, were placed on the loading reference line of the sample as a spacer between the testing machine and the sample, so that the load applied.... When the temperature reaches 1200 °C, recrystallization of the minerals after melting can be observed. At this time, the sandstone has lost its basic physical properties and load- bearing capacity......
mm ribbed steel resin bolt, with a row spacing of 1000 mm×1000 mm. Five cables are arranged on the roof with a spacing of 1850 m; two cables are arranged on each side, the first one is 1300 mm away...): 1386-1398. DOI: 10.1007/s11771-018-3834-4. [2] RANJITH P G, ZHAO Jian, JU Ming-he, DE SILVA R V S, RATHNAWEERA T D, BANDARA A K M S. Opportunities and challenges in deep mining: A brief review [J......
cross-section tunnel, and the classification of the surrounding rock of the tunnel is V, which means that the surrounding rock has a weak strength. The layout of Guanshui Road Station is shown in Figure 1..., and moderately weathered dolomite. The physical and mechanical parameters of the relevant materials are shown in Table 2 (γ stands for volumetric weight; E stands for elastic modulus; v stands......
; (1) 式中:P为激光功率；v为扫描速度；t为扫描层厚；S为扫描间距.体积能量密度可以为选区激光熔化成形件显微组织,冶金缺陷和成形性能的控制提供关键方法及科学机理[61].LEI等[62]研究能量密度对选区激光熔化Sc和Zr增强7075铝合金显微组织和致密度... of processing parameters on tensile properties of selective laser melted 304 stainless steel[J]. Materials & Design, 2013, 50(17): 581-586. [7] VILARO T, COLIN C, BARTOUT J D, NAZE L, SENNOUR M......
° and 75°) was 46.03%-61.32% lower than that of the intact sample, indicating that the presence of an opening and cross joints can significantly degrade the bearing capacity of rock. The existence.... These factors will cause the sample to have different bearing capacities and significantly affect the mechanical response behavior of the sample, thus showing significant anisotropic characteristics......
vehicle Table 1 Main parameters of CRH380A vehicle where v represents train speed, km/h; and Li is the characteristic length of the train; f1=37.2 Hz, f2=12.4 Hz, f3=5.3 Hz, f4=3.7 Hz. The track... software system was used in the test. NV 9828 ICP acceleration sensors were installed on steel plates with diameters of 5 cm that were fixed to the bridge and the ground. The sensitivity of the vibration......
simulated body fluid (SBF) [52] at pH 7.6, and found the corrosion potential (φcorr) values to be -2.22, -2.00, and -2.18 V and the corrosion current density (Jcorr) values to be 1.02×10-3, 4.5×10-4... are considered as cathodes [53]. However, the role of Mg2Ca in the local corrosion of Mg alloys is controversial. It has been reported that the potential of α-Mg (-2.37 V (vs SHE)) is relatively more......
South University Press, 2006. [36] SACCONE A, DELFINO S, BORZONE G, FERRO, R. The samarium-magnesium system: A phase diagram[J]. Journal of the Less Common Metals, 1989, 154(1): 47-60. [37] DENYS R V, POLETAEV A A, SOLBERG J K, TARASOV B P, YARTYS V A. LaMg11 with a giant unit cell synthesized by hydrogen metallurgy: Crystal structure and hydrogenation behavior[J]. Acta Materialia, 2010, 58(7......
, PONGE D, RAABE D, HIRATA A, CHEN M W, WANG Y D, LU Z P. Ultrastrong steel via minimal lattice misfit and high-density nanoprecipitation[J]. Nature, 2017, 544(7651): 460-464. [33] 易 将. Cu-Ni-Si合金的相变及Ag的微合金......
forces from rock blocks. Cutters today can either incorporate hard, fine grained carbides into the matrix of the disc material or apply a hardened coating of alloy powder on the steel substrate... cutter rings which adopted enhanced heat treatment [43]. BILGIN et al [18] found that replacing the CCS cutters with V-type disc cutters improved the penetration and increased the cutter life......
