scholarly journals Effect of Al–5Ti–1B grain refiner on the microstructure, mechanical properties and acoustic emission characteristics of Al5052 aluminium alloy

2015 ◽  
Vol 4 (2) ◽  
pp. 171-179 ◽  
Author(s):  
Amulya Bihari Pattnaik ◽  
Satyabrat Das ◽  
Bharat Bhushan Jha ◽  
Nedumbilly Prasanth
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Aluminium Alloy ◽  
Emission Characteristics ◽  
Grain Refiner

scholarly journals Research on mechanical properties and acoustic emission characteristics of rock beams with different lithologies and thicknesses

2021 ◽  
Vol 18 (8) ◽  
Author(s):  
Tong-bin Zhao ◽  
Peng-fei Zhang ◽  
Wei-yao Guo ◽  
Ya-xun Xiao ◽  
Yong-qiang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Emission Characteristics

scholarly journals Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Xinzhan Qin ◽  
Yu Zhou ◽  
Manchao He
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Cyclic Loading ◽  
Water Content ◽  
Coal Mines ◽  
Surrounding Rock ◽  
Emission Characteristics ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading ◽  
Pumped Storage

Due to the adjustment of energy structure, a large number of coal mines are abandoned. Considering the environmental and economic effects, many experts proposed to use the abandoned mine cavern as the reservoir of the pumped storage power station. Furthermore, considering the long-term effects of repeated pumping and drainage and hydrodynamic pressure on the surrounding rock in coal mines, a large amount of sandstone was collected from the Ruineng coal mine in Yan’an city to carry out a series of laboratory tests. Through uniaxial compression testing of rock samples with different water content rates, combined with acoustic emission (AE) analysis, the strength softening and macrodeformation characteristics are obtained, and the influence of water content on acoustic emission characteristics is clarified. The mechanical properties of water bearing rock under cyclic loading and unloading experiments with varying upper limits are obtained using a triaxial test system, and the precursory information of rock failure is captured, providing significant guidance for stability analysis and instability warning for surrounding rock in pumped storage power stations.

scholarly journals Characteristics Of Aluminium ADC 12/SiC Composite with the Addition of TiB and Sr Modifier

2019 ◽  
Vol 130 ◽  
pp. 01004
Author(s):  
Astari Indarsari ◽  
Anne Zulfia Syahrial ◽  
Budi Wahyu Utomo
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Wear Resistance ◽  
Elastic Modulus ◽  
Wear Rate ◽  
Thermal Resistance ◽  
Aluminium Alloy ◽  
Eutectic Phase ◽  
Grain Refiner ◽  
Brake Shoe

The addition of silicon carbide (SiC) as a reinforce in a composite can improve mechanical properties. In this study aluminium ADC 12 (Al-Si-Aluminium Alloy) is treated with an addition of SiC varied from (1; 1.5; 2; 2.5 to 3) vf% and mixed with 0.18 wt% Sr to change the morphology of the silicone eutectic phase and 0.15 wt% titanium boron (TiB) was added as a grain refiner as well as the addition of 5 wt% magnesium (Mg) to increase the wettability. All materials were fabricated by stir cast method. This research is conducted to obtain the candidate material for application in train's brake shoe and bearing. This kind of usage requires high mechanical properties such as wear resistance, thermal resistance, good elastic modulus and lightweight. The composites were characterised by both mechanical properties and microstructure. The result shows that there is an increase in the mechanical properties of aluminium ADC 12 /SiC composite compared to unreinforced with the value of 144 MPa of strength, 53 HRB of hardness, and 0.0049 mm3 m–1 of wear rate. As a result, the higher addition of the SiC results in the better mechanical properties for the composite.

scholarly journals Mechanical properties and acoustic emission characteristics of coal samples with different fissure angle

2021 ◽  
Author(s):  
Xuebin Gu ◽  
Tongbin Zhao ◽  
Weiyao Guo ◽  
Xufei Gong ◽  
Yongqiang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Elastic Modulus ◽  
Crack Growth ◽  
Failure Mechanism ◽  
Strain Softening ◽  
Failure Process ◽  
High Energy ◽  
Emission Characteristics ◽  
Quiet Period

Abstract To study the influence of fissure angle on the failure mechanism of coal mass, uniaxial compression tests were conducted on coal specimens with different fissure angles. The failure process and acoustic emission characteristics during loading were obtained. The mechanical properties and failure mode were further analyzed. The results showed that (1) The stress-strain behavior of specimens with different fissure angles can be divided into four typical stages, compaction, elastic deformation, crack growth and propagation, and strain-softening. The existence of pre-existing fissures reduces the duration of the elastic stage with an obvious influence on the crack growth and propagation stage, and strain-softening stage. (2) The uniaxial compressive strength, elastic modulus of the specimens containing pre-existing fissure are all lower than those of the unfissured. The strength and elastic modulus do not change significantly with fissure angle, which is closely related to the primary fracture of the coal. (3) With the increase of the fissure angle, the crack initiation location moves from the center of the pre-existing fissure to the tip. While fissure angle has no obvious effect on the crack propagation direction, the cracks develop along the loading direction. (4) The AE characteristics can be divided into three typical periods, quiet period, active period, and remission period. With the increase of the fissure angle, the duration proportion of the quiet period increases, indicating that the energy storage time of coal increases. With the increase of the fissure angle, the occurrence time of low frequency and high energy signal is delayed, indicating that the large-size rupture gradually concentrates in the late loading period. (5) Compared with rock samples containing pre-existing fissure, coal specimens have more primary fractures, and the failure mechanism of coal is dominated by the non-uniform primary fractures.

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