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, in the cantilever casting construction, the buckle cable force greatly affects the state of arch rib. If the buckle cable force is not well controlled, it will easily cause the arch rib section to crack..., ZHENG J, WANG L, GU H. Crack detection of FRP-reinforced concrete beam using embedded piezoceramic smart aggregates [J]. Sensors, 2019, 19: 1979. DOI: 10.3390/s19091979. [28] LI Wei-jie, LIU Tie-jun......
but then decreases with increasing axial static stress. This phenomenon occurs because as the axial static stress increases, the closure of initial micro-crack of rock occurs firstly, and then damage emerges... elastic deformation, crack initiation and propagation and post peak failure, and the corresponding porosity or damage degree of rock under decreases initially, then remains unchanged almost, subsequently......
or crack. As shown in Table 1, WC-12Co composite powders with grain size in the range of 125-180 μm and the average particle size of 152.5 μm have the carbon content of 5.38 wt.% and low oxygen content... spherical particles, as well as large crack and pore could be also observed visibly. Moreover, when the laser power increased to 1900 W, the grain became coarse, the distribution of layers was uneven......
increase continuously, and the expanded fissures are caused by excavation. When the width of excavation reaches to 0.4 m, the AE events tend to increase sharply, and the crack propagates rapidly, meanwhile... of the fracture influenced by mining based on fractal theory [J]. Geotechnical Investigation & Surveying, 2017, 45(1): 1-6. (in Chinese) [24] XU Gang-gang. Research on crack network fractal......
) The water content of the anchorage zone is close to the equilibrium water content, and plastic limit is the most disadvantageous situation. Crack is the most important index for dividing the area affected... and shrinkage. Due to the effect of atmospheric drying-wetting cycles, cracks developed in the shallow layer (2 m) of the slope. Dense crack networks were distributed on the surface of the slope, and many large......
. The agglomeration of CNTs- Al2O3 NPs provided sites for crack initiation and acted as a stress concentration sites. According to CASATI and VEDANI [3], agglomerated regions and also the aggregation of oxide particles on the fracture surface may provide the sites for crack initiation, resulting in decrease in the ductility of composite. The fracture surfaces of those nanocomposites milled......
/min. When the speed was increased to 900 r/min (Fig. 3(d)), a crack appeared in the center of the surface; as the rotation speed was further increased to 1200 r/min (Fig. 3(e)), the crack length......
activities 3.1 MS monitoring system An MS event is a rock fracture involving the generation of a new crack or extension of an existing crack in localized rock mass [16]. The MS source information......
of cleavage fracture steps, tearing edges, coarse pores and longer cracks, showing an obvious brittle fracture. The coarse phases become the source of crack growth easily. After adding the GNPs..., and the higher the energy consumed by the crack propagation and diffusion generated by the external force. It is more difficult for cracks to propagate, so the fine grain strengthening effect brought......
occurrence. The adhesion between the pin surface and the disk led to crack growth in sub-surface regions, which led to a fracture of the surface protective layer and significant material loss. Fig. 12... and the disk and due to the brittleness of this sample, crack propagation occurred in some sub-surface regions and the MML layer could not stand on the surface of the milled sample under 80 N......