File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Conference Paper: The strength and crack behavior of the rock-like gypsum under high strain rate

TitleThe strength and crack behavior of the rock-like gypsum under high strain rate
Authors
Issue Date2012
Citation
46th US Rock Mechanics / Geomechanics Symposium 2012, 2012, v. 3, p. 1773-1786 How to Cite?
AbstractThe strength of rock and rock-like brittle materials is loading-rate dependent in a wide range of strain rate. Besides, the crack initiation and propagation processes under the high strain-rate loading and quasi-static loading are different. In order to investigate the dynamic fracture performance under the high strain rate conditions, rock-like artificially moulded gypsum specimens with and without pre-existing flaw(s) are loaded under different strain rates. A quasi-static loading is applied to the specimens by a uniaxial compression machine. The dynamic loading is produced by the split Hopkinson pressure bar (SHPB). The strain-time history recorded by the strain gauges attached on the incident and transmitted bars is used to obtain the strain-stress curve in the specimen. At the same time, the entire fracturing process is recorded by a high speed video system at a frame rate of 40,000 frames per second. It is found that the strength of the gypsum specimens increases apparently as the strain rate increases from approximately 10 2 s-1 to103 s-1, while the strength is nearly constant under a quasi-static loading of a strain rate from 10 -6 s-1 to 10-3 s-1. With regard to the fracturing processes, for specimens containing a pre-existing flaw, the high speed camera images show that the first tensile wing cracks initiating under the dynamic condition are similar to those under the quasi-static condition. However, the dynamic secondary crack patterns are distinct from those of the quasi-static ones. The experimental findings provide insights into the relationship between the material strength and the dynamic fracture mechanism. Copyright 2012 ARMA, American Rock Mechanics Association.
Persistent Identifierhttp://hdl.handle.net/10722/213991

 

DC FieldValueLanguage
dc.contributor.authorZou, Chunjiang-
dc.contributor.authorWong, Louis Ngai Yuen-
dc.contributor.authorCheng, Yi-
dc.date.accessioned2015-08-19T13:41:28Z-
dc.date.available2015-08-19T13:41:28Z-
dc.date.issued2012-
dc.identifier.citation46th US Rock Mechanics / Geomechanics Symposium 2012, 2012, v. 3, p. 1773-1786-
dc.identifier.urihttp://hdl.handle.net/10722/213991-
dc.description.abstractThe strength of rock and rock-like brittle materials is loading-rate dependent in a wide range of strain rate. Besides, the crack initiation and propagation processes under the high strain-rate loading and quasi-static loading are different. In order to investigate the dynamic fracture performance under the high strain rate conditions, rock-like artificially moulded gypsum specimens with and without pre-existing flaw(s) are loaded under different strain rates. A quasi-static loading is applied to the specimens by a uniaxial compression machine. The dynamic loading is produced by the split Hopkinson pressure bar (SHPB). The strain-time history recorded by the strain gauges attached on the incident and transmitted bars is used to obtain the strain-stress curve in the specimen. At the same time, the entire fracturing process is recorded by a high speed video system at a frame rate of 40,000 frames per second. It is found that the strength of the gypsum specimens increases apparently as the strain rate increases from approximately 10 2 s-1 to103 s-1, while the strength is nearly constant under a quasi-static loading of a strain rate from 10 -6 s-1 to 10-3 s-1. With regard to the fracturing processes, for specimens containing a pre-existing flaw, the high speed camera images show that the first tensile wing cracks initiating under the dynamic condition are similar to those under the quasi-static condition. However, the dynamic secondary crack patterns are distinct from those of the quasi-static ones. The experimental findings provide insights into the relationship between the material strength and the dynamic fracture mechanism. Copyright 2012 ARMA, American Rock Mechanics Association.-
dc.languageeng-
dc.relation.ispartof46th US Rock Mechanics / Geomechanics Symposium 2012-
dc.titleThe strength and crack behavior of the rock-like gypsum under high strain rate-
dc.typeConference_Paper-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-84873263810-
dc.identifier.volume3-
dc.identifier.spage1773-
dc.identifier.epage1786-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats