Quantitative Characteristic of Meso-Damage Granite under Cyclic Loading with Different Frequencies

Xiao Hui Ni

doi:10.4028/www.scientific.net/AMM.638-640.690

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 638-640Quantitative Characteristic of Meso-Damage Granite...

Quantitative Characteristic of Meso-Damage Granite under Cyclic Loading with Different Frequencies

Abstract:

The failure damages of granite under cyclic fatigue load were caused by the propagation and coalescent of cracks at mesoscale, so it was helpful to understand the mechanical behaviours of rock by quantitatively investigating on meso-damage of granite. Stress amplitude of 10 MPa and sine wave cyclic loads with five different frequencies of 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1 Hz were adopted as dynamic disturbance. Then, the microtest (SEM) is carried out to study its fractography morphology and the meso-structural images of marble were processed by regional growing theory based on image processing technique. The meso-damage information of granite microcracks was obtained from SEM images. Quantitative analysis of meso-damage characteristics under cyclic fatigue load wase made from angle, length, width and area. The results showed that with the frequency of cyclic load increasing, the dispersion of microcrack growth azimuth value increased and the average of microcrack growth azimuth value fluctuated in the range. It is great helpful for seismic response analysis of the nuclear power factory in Chang Jiang.

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Periodical:

Applied Mechanics and Materials (Volumes 638-640)

Pages:

690-693

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.638-640.690

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Online since:

September 2014

Authors:

Xiao Hui Ni*

Keywords:

Cyclic Loading, Meso-Damage Characteristics, Quantitative Analysis, SEM

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