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| EXPERIMENTAL STUDY ON DYNAMIC CONSTITUTIVE CHARACTERISTICS OF ANTHRACITE OF YUNJIALING COAL MINE |
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Abstract Impact experiments for anthracite of Yunjialing coal mine are performed on split Hopkinson pressure bar(SHPB) equipment with a large diameter of 75 mm. Generally，dynamic stress-strain curve for this kind of anthracite has four stages which are nonlinear beginning load stage，plastic yielding stage，strengthening stage，and the last unloading breakage stage. Correspondingly，dynamic stress-strain curve has three characteristic parameters，which are the beginning modulus，yield strength and ultimate strength；and all of them go up with strain rate，but yield strength has best correlativity with strain rate. Plastic yielding is the most remarkable character of anthracite under uniaxial dynamic compression.
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Received: 30 June 2005
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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