Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits

Impact induced dynamic cracks are produced with a Split Hopkinson Pressure Bar (SHPB) apparatus in two rocks (Kuru granite and Flamboro limestone) with impact velocities ranging from 8 to 12 m/s. Impact bit (tungsten carbide) diameters range from 8mm to 15mm. Dye impregnation combined with UV imagin...

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Bibliographic Details
Main Author: Nariseti, Chanakya
Other Authors: Mohanty, Bibhu
Language:en_ca
Published: 2013
Subjects:
Online Access:http://hdl.handle.net/1807/43266
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spelling ndltd-TORONTO-oai-tspace.library.utoronto.ca-1807-432662013-12-06T04:00:15ZQuantification of Damage in Selected Rocks due to Impact with Tungsten Carbide BitsNariseti, ChanakyaDamage Quantification in Rockslow velocity impact experiments0551Impact induced dynamic cracks are produced with a Split Hopkinson Pressure Bar (SHPB) apparatus in two rocks (Kuru granite and Flamboro limestone) with impact velocities ranging from 8 to 12 m/s. Impact bit (tungsten carbide) diameters range from 8mm to 15mm. Dye impregnation combined with UV imaging, CAT scans and Optical scans were employed to study the resulting crack patterns. The resulting damage is quantified in terms of radial crack density on impact surface, crater, crushed zone and crack density with depth. In both rocks ‘total’ damage obtained is directly proportional (exponential) with bit diameter and impact velocity. The ‘total’ damage in Kuru granite is found to be greater than Flamboro limestone at all impact velocities; however, the crushed zone in the latter is found to consistently greater than the former. 2D simulations of dynamic fractures with AUTODYN have also been carried out showing good qualitative agreement with experimental results.Mohanty, Bibhu2013-112013-12-05T20:53:06ZNO_RESTRICTION2013-12-05T20:53:06Z2013-12-05Thesishttp://hdl.handle.net/1807/43266en_ca
collection NDLTD
language en_ca
sources NDLTD
topic Damage Quantification in Rocks
low velocity impact experiments
0551
spellingShingle Damage Quantification in Rocks
low velocity impact experiments
0551
Nariseti, Chanakya
Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits
description Impact induced dynamic cracks are produced with a Split Hopkinson Pressure Bar (SHPB) apparatus in two rocks (Kuru granite and Flamboro limestone) with impact velocities ranging from 8 to 12 m/s. Impact bit (tungsten carbide) diameters range from 8mm to 15mm. Dye impregnation combined with UV imaging, CAT scans and Optical scans were employed to study the resulting crack patterns. The resulting damage is quantified in terms of radial crack density on impact surface, crater, crushed zone and crack density with depth. In both rocks ‘total’ damage obtained is directly proportional (exponential) with bit diameter and impact velocity. The ‘total’ damage in Kuru granite is found to be greater than Flamboro limestone at all impact velocities; however, the crushed zone in the latter is found to consistently greater than the former. 2D simulations of dynamic fractures with AUTODYN have also been carried out showing good qualitative agreement with experimental results.
author2 Mohanty, Bibhu
author_facet Mohanty, Bibhu
Nariseti, Chanakya
author Nariseti, Chanakya
author_sort Nariseti, Chanakya
title Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits
title_short Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits
title_full Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits
title_fullStr Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits
title_full_unstemmed Quantification of Damage in Selected Rocks due to Impact with Tungsten Carbide Bits
title_sort quantification of damage in selected rocks due to impact with tungsten carbide bits
publishDate 2013
url http://hdl.handle.net/1807/43266
work_keys_str_mv AT narisetichanakya quantificationofdamageinselectedrocksduetoimpactwithtungstencarbidebits
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