On the indentation fracture of cemented carbide part 1 — Survey of operative fracture modes

Ogilvy, I.M.; Perrott, C.M.; Suiter, J.

doi:10.1016/0043-1648(77)90117-x

Cited by 63 publications

(13 citation statements)

References 10 publications

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“…His results indicated that the maximum tensile field occurred at the corners of the indentation and was confined to a shallow surface region within the plastic zone. It was this field he claimed, which gave rise to the surface radial -or 'Palmqvist' (after Palmqvist [29]) -cracks observed by various workers before the onset of median cracking [15,[30][31][32].…”

Section: Initiationmentioning

confidence: 99%

A review of indentation fracture theory: its development, principles and limitations

Ostojic

McPherson

1987

Int J Fract

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The influence of 'blunt' and 'sharp' indenters in producing indentation crack patterns is outlined. Attention is then focused on the initiation and propagation of cracks formed during a sharp contact event as such contacts are of the most practical interest and are commonly used to determine the fracture toughness of opaque materials. The modifying influence on the behaviour of such cracks as a result of anisotropy, particle size, environment and residual stress effects is briefly discussed. A simplistic derivation of the current formula used in determining the fracture toughness of suitable materials from a sharp contact event is then given. The criteria for valid results are also presented and these, in conjunction with other points discussed, highlight some of the limitations of this method of toughness testing.

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Section: Initiationmentioning

confidence: 99%

A review of indentation fracture theory: its development, principles and limitations

Ostojic

McPherson

1987

Int J Fract

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“…Fracture toughness is a main property for the design of hardmetal cutting tools due to the high risk of brittle fracture. Besides, because the mechanisms of wear exhibited by cemented carbides are mainly mechanisms of surface fracture, the severity of wear must be largely controlled by the fracture toughness of the surface layers [6].…”

Section: Fracture Toughnessmentioning

confidence: 99%

A study on the mechanical behaviour of WC/Co hardmetals

Ferreira

Amaral

Antunes

et al. 2009

International Journal of Refractory Metals and Hard Materials

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The hardmetal cutting tools used in machining are submitted to extreme conditions in terms of temperature and mechanical loading. A better understanding of the failure of cutting tools and capability to predict tool life are key factors in the development of new tool materials with improved mechanical behaviour. Main failure mechanisms are wear, thermal-mechanical fatigue and brittle fracture. The aim of present work is to study the mechanical behaviour of two hardmetals. The properties studied were Young's modulus, bending strength, fracture toughness and fatigue endurance. The resonant technique was used to determine elastic properties and a good agreement was found with three-point bending results.

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“…Their work was later expanded by others. [16][17][18][19][20] Shortly after the theoretical work of Lawn and Fuller, another theoretical model was developed in 1977 by Ogilvy et al, [21] and became known as the Palmqvist crack model, the geometry of which is also shown in Figure 1. They discovered that unlike the median crack model, Palmqvist cracks tend to be only as deep as the indenter penetration and that cracks are independent of each other.…”

Section: Introductionmentioning

confidence: 99%

“…A critical evaluation study was conducted to determine how well the fracture toughness measured by the Palmqvist indentation method with the median crack model compares to the bulk fracture toughness by other methods previously mentioned. [21] Several criteria were used for selecting ceramic materials in this study. The most important was having a broad range of bulk fracture toughness in order to provide confidence in the comparison.…”

Section: Introductionmentioning

confidence: 99%

“…Next, in importance, was to use ceramics that had common representative types of structures such as amorphous, monocrystalline, or polycrystalline solids. Finally, the selection was made of materials that could be used to ''calibrate'' [21] the equations. The experimental results indicate that there is good agreement within experimental errors between Palmqvist and bulk fracture toughness values for glasses, glassceramic composites, and ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Palmqvist fracture toughness of a new wear-resistant weld alloy

Meacham

Marshall

Branagan

2006

Metall Mater Trans A

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The Palmqvist fracture toughness method was applied in a new fashion to measure the fracture toughness of a new wear-resistant alloy in both a powder product for plasma-transferred arc (PTA) welding and a wire product for metal inert gas (MIG) welding. Cracks were observed at high loads with a linear relationship between load and crack length indicating that only Palmqvist cracks occurred in the alloys. The fracture toughness for the no-preheat and preheat PT40 welds are 15.6 6 0.3 MPa m 1/2 and 17.6 6 0.1 MPa m 1/2 , respectively, and for the no-preheat and preheat MG40 welds are 12 6 1 MPa m 1/2 and 20.5 6 0.2 MPa m 1/2 , respectively. Observations of the cracks show evidence of ligaments indicating that the toughness mechanism is due to crack bridging. The microstructural scale and morphology correlates with the fracture toughness, and as the structural scale decreases, the fracture toughness increases.

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On the indentation fracture of cemented carbide part 1 — Survey of operative fracture modes

Cited by 63 publications

References 10 publications

A review of indentation fracture theory: its development, principles and limitations

A review of indentation fracture theory: its development, principles and limitations

A study on the mechanical behaviour of WC/Co hardmetals

Palmqvist fracture toughness of a new wear-resistant weld alloy

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