Water-Weakening Effects on the Strength of Hard Rocks at Different Loading Rates: An Experimental Study

2021 ◽  
Author(s):  
Jun Zhu ◽  
Jianhui Deng ◽  
Fei Chen ◽  
Yuanjun Ma ◽  
Yifan Yao
Keyword(s):  
Experimental Study ◽  
Loading Rates ◽  
Hard Rocks

Experimental study on basalt FRP/steel single-lap joints under different loading rates and temperatures

2016 ◽  
Vol 145 ◽  
pp. 68-79 ◽  
Author(s):  
Mingxia Yao ◽  
Deju Zhu ◽  
Yiming Yao ◽  
Huaian Zhang ◽  
Barzin Mobasher
Keyword(s):  
Experimental Study ◽  
Lap Joints ◽  
Loading Rates ◽  
Single Lap Joints

scholarly journals Spatial-Temporal Heterogeneity of Rock Samples’ Deformation and Damage: Experimental Study and Digital Image Correlation Analysis

2021 ◽  
Author(s):  
Fayuan Yan ◽  
Chengzhi Qi ◽  
Renliang Shan
Keyword(s):  
Experimental Study ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Small Scale ◽  
Temporal Heterogeneity ◽  
Deformation Bands ◽  
Red Sandstone ◽  
Loading Rates ◽  
Propagation Velocities

Abstract In-situ observations and laboratory experiments showed that slow deformation waves widely exist in geomedia under loading conditions. Slow deformation waves’ behavior exhibits some similarities in media ranging from the scale as large as the Earth's crust to the scale as small as the laboratory test samples. However, the mechanism underlying their generation has not been clarified yet. In this research an experimental study was performed on small-scale red sandstone samples subjected to uniaxial compression at the displacement rates of 0.1, 0.5, and 1 mm/min. Slow deformation waves under different loading rates were analyzed by speckle photography for microscopic characterization combined with the digital image correlation (DIC) technique. The Luders deformation bands were predominantly observed in the flow channels formed at the stage of macro-elastic deformation. The spatial-temporal heterogeneity of the rock sample surface was quantified, and the deformation waves' propagation velocities under different loading rates were obtained. The linear relationship between the propagation velocities of slow deformation waves and the loading rates was determined. The research findings shed some new lights on the evolutionary characteristics of the slow deformation waves.

Experimental study of ejecta on lead surface at different loading rates and amplitudes

2012 ◽  
Author(s):  
Yongtao Chen ◽  
Haibo Hu ◽  
Qingzhong Li ◽  
Rongbo Wang ◽  
Tiegang Tang
Keyword(s):  
Experimental Study ◽  
Loading Rates

Experimental Study on Mechanical Compression of Potato

2014 ◽  
Vol 926-930 ◽  
pp. 993-996
Author(s):  
Feng Wei Zhang ◽  
Lin Rong Shi ◽  
Li Juan Wang ◽  
Fei Dai ◽  
Zheng Sheng Han
Keyword(s):  
Experimental Study ◽  
Moisture Content ◽  
Loading Rate ◽  
Mechanical Damage ◽  
Rupture Force ◽  
Mechanical Compression ◽  
Difference Analysis ◽  
Loading Rates ◽  
Loading Direction ◽  
Significant Difference

To reduce mechanical damage to potato caused by potato digger while it works, two kinds of Gansu potato were Researched in compression, moisture content of about 56.8%, 5 different loading rates, three different loading directions, and Experiment results were analyzed in significant difference. The significant results show that loading direction significantly affected on rupture force, the loading rate on the rupture force was extremely significant, varieties of potato significantly affected on compression deformation. Difference analysis results show that loading direction of different pairs not significantly affected on rupture forces, X amount of deformation of the potato was greater. Loading rate 15mm/min, 25 mm/min and 35 mm/min on the rupture force were significantly affected, and loading rate of 45 mm/min and 55 mm/min on the rupture force of impact was consistent, and differences in varieties significantly affected on deformation.

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