101624 20230519145427.0 doi 10.1016/j.fuel.2021.120408 sideral 123962 ART-2021-123962 eng Ren, Q. Roles of moisture and cyclic loading in microstructures and their effects on mechanical properties for typical Chinese bituminous coals 2021 Access copy available to the general public Unrestricted This work aimed at studying the roles of moisture and cyclic loading in microstructures and their effects on mechanical properties for typical Chinese bituminous coals. Different relative moisture contents (100%, 75%, 50%, 25%, and 0%) for Shenmu coal (SM), Hongshaquan coal (HSQ), and Wucaiwan coal (WCW) were chosen to study the effects of moisture. The raw SM was then further selected to investigate the effects of cyclic loading. Images of coals surfaces and mechanical properties during simulated crushing process were recorded and combined to be analyzed. The results showed that the moisture possessed significant effects on coal mechanical properties, which strongly depended on their porosities. As for low porosity coal (SM), the adsorption of moisture can soften and lubricate the microstructures, weakening mechanical properties. While the drying process would destroy the microstructures and decease mechanical properties for high porosity coals (HSQ and WCW). Under the cyclic loading process, the cumulative effects of strain showed a step-up state and the first cyclic loading can typically cause the biggest change of microstructures and produce the largest strain under different stress levels. Finally, a normalized quantitative relationship ([fórmula]) between the relative fractal dimension and relative stress was built. info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 8.035 2021 ENGINEERING, CHEMICAL 19 / 143 = 0.133 2021 Q1 T1 ENERGY & FUELS 29 / 119 = 0.244 2021 Q1 T1 1.514 2021 Energy Engineering and Power Technology 2021 Q1 Organic Chemistry 2021 Q1 Chemical Engineering (miscellaneous) 2021 Q1 11.2 2021 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Zhang, Y. Arauzo, I. Universidad de Zaragoza (orcid)0000-0001-5473-6919 Shan, L. Xu, J. Wang, Y. Su, S. Hu, S. Xiang, J. 5004 590 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Máquinas y Motores Térmi. 293 (2021), 120408 [8 pp] Fuel Fuel 0016-2361 1020054 http://zaguan.unizar.es/record/101624/files/texto_completo.pdf Postprint 957449 http://zaguan.unizar.es/record/101624/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:101624 articulos driver 2023-05-18-14:14:00 ARTICLE