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Discrete element modeling of tool-ro...

Huang, Haiying.

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Discrete element modeling of tool-rock interaction.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Discrete element modeling of tool-rock interaction./
作者:	Huang, Haiying.
面頁冊數:	131 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5656.
Contained By:	Dissertation Abstracts International60-11B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9952314
ISBN:	9780599526297

Discrete element modeling of tool-rock interaction.
Huang, Haiying.

Discrete element modeling of tool-rock interaction. - 131 p.

Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5656.

Thesis (Ph.D.)--University of Minnesota, 1999.

This study on discrete element modelling of tool-rock interaction focuses on establishing scaling laws between the phenomenological parameters of a material and the properties of a discrete disc assembly, and on applying the discrete element method to analyze failure mechanisms in indentation and cutting of rocks. The discrete element code PFC2D is employed to carry out this research.

ISBN: 9780599526297Subjects--Topical Terms:

783781
Engineering, Civil.

Discrete element modeling of tool-rock interaction.
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245 1 0 $a Discrete element modeling of tool-rock interaction.
300 $a 131 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5656.
500 $a Adviser: Emmanuel Detournay.
502 $a Thesis (Ph.D.)--University of Minnesota, 1999.
520 $a This study on discrete element modelling of tool-rock interaction focuses on establishing scaling laws between the phenomenological parameters of a material and the properties of a discrete disc assembly, and on applying the discrete element method to analyze failure mechanisms in indentation and cutting of rocks. The discrete element code PFC2D is employed to carry out this research.
520 $a The scaling laws are constructed to determine the elastic constants, the compressive and tensile strengths sigmac and sigma t and the toughness KIc of the disc assembly from the micro-scale parameters (e.g., contact stiffnesses, shear and normal bond strengths Ts,Tn, etc.). The analysis is conducted using dimensional analysis and numerical uniaxial and biaxial tests. The numerical results indicate that the bond strength ratio Ts/Tn governs the micro-scale failure mechanism of the particle assembly. Depending on the ratio Ts/Tn , different types of materials such as metals and rocks can be modelled. An analytical expression for the toughness of a regular square packing assembly is derived. The solution can be generalized to the case of an irregular assembly. For a mixed mode of failure involving both damage and crack propagation, the mean particle radius R is imposed by material properties and is lost as a discretization parameter.
520 $a The indentation and cutting processes are then simulated with particle assemblies having rock-like properties. The dual failure mechanism observed in rock indentation and cutting experiments are reproduced in numerical simulations. The numerical tests validate the concept that only a ductile failure is caused by indentation (i.e., no crack initiates as the damaged zone grows) if a scaled flaw length Λ = lambda/(KIc/sigma c)2 is small. The transition from a ductile to a brittle mode of failure in the cutting process is also controlled by a length, a critical depth of cut d&ast; proportional to (KIc/sigmac) 2. The analysis of the contact on the cutter face reveals that a multi-directional flow mechanism exists for the solid ahead of the cutter. Due to the divided flow, the total force inclination on the cutter depends on the rake angle and is not a measure of the interfacial friction angle between the rock and the cutter.
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650 4 $a Engineering, Petroleum. $3 1018448
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