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Relation between Loading Rate and fracture velocity on Limestone

Journal of Geological Resource and Engineering 2020年第4期8卷 114-120页

作者： Ajay Kumar Jha BioID GmbH Nürnberg 90489Germany

The relation between loading rate and fracture velocity is the key to determining the fracture toughness of rock mass under dynamic *** designing an optimal blast design for any limestone mines,understanding the relationship between blast detonation pressure and rock fragmentation can increase the energy utilisation in any limestone mine *** detonation pressure is directly related to dynamic loading rate and fracture velocity is directly related to stress wave propagation speed during *** paper discusses the relationship between dynamic loading rate and fracture velocity for limestone *** was observed that crack propagation velocity increases with fracture toughness of rock *** may be concluded that as the dynamic loading increases,the fracture velocity increases.

关键词： fracture velocity split Hopkinson pressure bar(SHPB) loading rate

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Dynamic fracture Toughness Tests on Limestone

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Journal of Geological Resource and Engineering 2020年第5期8卷 184-196页

作者： Ajay Kumar Jha BioID GmbH Nürnberg 90489Germany

Limestone being sedimentary rock contains multiple bedding planes,which has vertical cracks or *** explosives apply high dynamic loading rate during blasting *** fragmentation&comminution process,the measure of critical SIF(stress intensity factor)is pertinent to be measured and is known as dynamic fracture toughness of *** order to investigate the influence of several factors on the mode-I fracture toughness and fracture behavior of limestone,dynamic fracture toughness tests(mode-I)were conducted under various conditions of loading *** microstructure of rocks was also investigated to understand the dynamic fracture toughness and fracture mechanism of *** paper deals with results of 11 limestone specimen subjected to dynamic fracture toughness *** was observed that crack surface velocity increases with increase in dynamic fracture *** fracture velocity also increases with increase in dynamic fracture *** fracture velocity in limestone increases between 1.14-5.09 times with increased fracture *** crack surface velocity of limestone increases between 1.39-3.09 times with increase in dynamic fracture toughness.

关键词： fracture toughness fracture velocity crack surface velocity

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