Macro- and micro-approach to the notch-induced fracture process and notch tensile strength in eutectoid hot-rolled pearlitic steel: Weakest Link versus Process Zone Fracture Criterion

Cohesive Zone Models (CZMs) are being increasingly used to simulate fracture and fragmentation processes in metallic, polymeric, and ceramic materials and their composites. Instead of an infinitely sharp crack envisaged in fracture mechanics, CZM presupposes the presence of a fracture process zone where the energy is transferred from external work both in the forward and the wake regions of the propagating crack. In this paper, we examine how the external work flows as recoverable elastic strain energy, inelastic strain energy, and cohesive energy, the latter encompassing the work of fracture and other energy consuming mechanisms within the fracture process zone. It is clearly shown that the plastic energy in the material surrounding the crack is not accounted in the cohesive energy. Thus cohesive zone energy encompasses all the inelastic energy e.g., energy required for grainbridging, cavitation, internal sliding, surface energy but excludes any form of inelastic strain energy in the bounding material.

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Development of Hot-Rolled Sheet Steel with the Significant Increase in Tensile Strength Induced by Strain Age Hardening

10.4271/2002-01-0040 ◽

2002 ◽

Cited By ~ 1

Author(s):

S. Kaneko ◽

J. Hiramoto ◽

S. Matsuoka ◽

A. Tosaka ◽

K. Sakata

Keyword(s):

Tensile Strength ◽

Sheet Steel ◽

Age Hardening ◽

Rolled Sheet ◽

Hot Rolled

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Experimental and numerical study on the fracture process zone and fracture toughness determination for ISRM-suggested semi-circular bend rock specimen

Engineering Fracture Mechanics ◽

10.1016/j.engfracmech.2016.01.002 ◽

2016 ◽

Vol 154 ◽

pp. 43-56 ◽

Cited By ~ 61

Author(s):

M.D. Wei ◽

F. Dai ◽

N.W. Xu ◽

T. Zhao ◽

K.W. Xia

Keyword(s):

Fracture Toughness ◽

Fracture Process ◽

Fracture Process Zone ◽

Rock Specimen ◽

Numerical Study ◽

Process Zone

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Fiber Debonding Along a Crack Front in Paper

MRS Proceedings ◽

10.1557/proc-539-153 ◽

1998 ◽

Vol 539 ◽

Cited By ~ 1

Author(s):

H. Kettunen ◽

K. J. Niskanen

Keyword(s):

Fracture Energy ◽

Crack Front ◽

Fracture Process ◽

Fracture Process Zone ◽

Process Zone ◽

Bond Properties ◽

Crack Line ◽

Pull Out ◽

Microscopic Damage ◽

Debonding Process

AbstractWe follow the accumulation of microscopic damage ahead the crack tip in paper. The fiber debonding process varies even within each specimen because of large variation in fiber and bond properties. In general, stiff and weakly bonded fibers tend to debond as a rigid body while ductile or well bonded fibers pull out gradually in a process that propagates from the crack line to the fiber ends. Particularly in the latter case the network ruptures coherently rather than through debonding of single fibers. Experimental analysis and simulations show that fracture energy correlates closely with the size of the fracture process zone (FPZ) irrespective the nature of the debonding process. Only the cases of low bonding and stiff fibers seem to make an exception in that FPZ can grow in size without a corresponding increase in fracture energy.

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