Subloading Surface Model and Experimental Study of Coal Failure under Cyclic Loading
| Autor: | Shuaifeng Lu, Sifei Liu, Zhijun Wan, Tong-huan Li, Wang Jingchao |
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| Rok vydání: | 2019 |
| Předmět: |
Imagination
Materials science Chemical substance Article Subject media_common.quotation_subject 0211 other engineering and technologies 02 engineering and technology 010502 geochemistry & geophysics complex mixtures 01 natural sciences Instability Stability (probability) otorhinolaryngologic diseases lcsh:TA401-492 General Materials Science Geotechnical engineering Coal Sensitivity (control systems) 021101 geological & geomatics engineering 0105 earth and related environmental sciences media_common business.industry technology industry and agriculture General Engineering Mode (statistics) respiratory tract diseases lcsh:Materials of engineering and construction. Mechanics of materials Deformation (engineering) business |
| Zdroj: | Advances in Materials Science and Engineering, Vol 2019 (2019) |
| ISSN: | 1687-8442 1687-8434 |
| Popis: | The fatigue damage of rock is an important factor affecting the stability of rock structure. In this paper, the mechanical response of coal under cyclic loading was studied. In order to accurately describe the deformation characteristics of coal under cyclic loading, an elastic-plastic model of coal based on the theory of subloading surface was established and verified by experiments. The model can well reflect the Mancin effect and ratcheting effect of coal samples, which is basically consistent with the actual deformation characteristics of coal, and the theoretical value and experimental value are in good agreement. At the same time, the cyclic response characteristics of specimens under strain load disturbance were analyzed. The results show that the specific strain disturbance can only cause a certain damage to coal and the area of hysteresis loop decreases first, then stabilizes, and then increases as the number of cycles increases. In addition, the damage factor Dn in the model was analyzed in this paper. Dn, which can accurately describe the damage process of coal, accurately locate the time point of disturbance load change, and has greater sensitivity to coal failure, is helpful to improve the accuracy of the stability judgment of coal structure and ensure the safety of engineering. The above results are of great significance for strengthening the understanding of coal mass instability process and mode under cyclic loading. |
| Databáze: | OpenAIRE |
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