【摘 要】
：
To investigate the acoustic emission (AE) characteristics of quasi-brittle materials like rock and concrete, and to further analyze their damage and failure mechanism under seismic and other dynamic loads, the uniaxial tension test of granite cylinder spe
【机 构】
：
College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China;School of Arch
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
To investigate the acoustic emission (AE) characteristics of quasi-brittle materials like rock and concrete, and to further analyze their damage and failure mechanism under seismic and other dynamic loads, the uniaxial tension test of granite cylinder specimens within the strain rate range of 10-7-10-4 s-1 was monitored by AE technology, and the typical AE characteristic parameters were analyzed using statistical and correlation analysis. The experimental results show that, with the increase of strain rate, the peak of AE hit rate appears earlier and increases; the proportion of AE hits with higher duration or amplitude increases significantly, the b-value shows a decreasing trend, and the distribution of AE frequency-amplitude is increasingly discrete. In addition, the obvious characteristic of double dominant frequency bands was observed in AE waveforms by using spectrum analysis, with the increase of strain rate, the percentage of A-type waveforms corresponding to low dominant frequency band increases, while that of D-type waveforms corresponding to high ones decreases accordingly, which is significance for the further study of the damage and failure mechanism of quasi-brittle materials.
其他文献
MoS2-decorated C3N4 (C3N4/MoS2) nanosheets hybrid photocatalysts were prepared by a simple sonication-impregnation method.Face-to-face lamellar heterojunctions were well established between two dimension (2D) C3N4 and MoS2 nanosheets.The effects of MoS2 c
Non-spherical colloidal silica nanoparticle was prepared by a simple new method,and its particle size distribution and shape morphology were characterized by dynamic light scattering (DLS) and the Focus Ion Beam (FIB) system.This kind of novel colloidal s
A simulation study was carried out by using dissipative particle dynamics (DPD) method to explore the effects of properties of coating chains,such as length,density,rigidity of polymer chains,as well as the distance between nanoparticles on bonding reacti
The electronic structure and the magnetic properties of Fe2Si bulk have been calculated by the first-principle density function theory method.The band structure shows that the hexagonal Fe2Si bulk is ferromagnetic which is a metal structure under spin-up,
Mullite and corundum co-bonded SiC-based composite ceramics (SiC-mullite-Al2O3) were prepared by using SiC, calcined bauxite and kaolin via pressureless carbon-buried sintering. The low-cost SiC-based composite ceramics designed in this study are expected
TiO2 nanopowders with different nitrogen (N) dopant concentrations were first synthesized by sol-gel method.XRD,TEM,HRTEM,XPS,UV-vis DRS were used to characterize the effects of N doping on the microstructures and optical properties of TiO2.The results in
Influence of structural variations of N-vinylimidazolium tetrahalogenidoferrate (III) magnetic ionic liquids (MILs) on thermal properties was investigated. Using Gaussian09/B3PW91/6-311G (2d, p) density functional methods, the microstructure of the MILs w
To improve both oxygen evolution efficiency and stability at high temperatures,Mn,Mn+Mo,Mn+Mo+V,and Mn+Fe+V oxide electrodes were prepared on a Ti substrate,with an intermediate layer of IrO2,by an anodic deposition method.The crystal structure,surface mo
Different heating treatments with the variation of heating rates, holding temperatures and holding time were used to simulate the LTPS procedure. The experimental results show that the reheating shrinkage rates of glass substrates are rarely changed with
We fabricated the nanofiber composite membranes by impregnating Nafion into the modified polyvinylidene fluoride(PVDF) electrospinning nanofiber mat for proton exchange membrane fuel cells applications. The hydrophobic PVDF nanofibers mat became to the hy