Resistance to Contact Deformation and Damage of Hard Ceramics

Jiménez‐Piqué, E.; Llanes, L.; Anglada, M.

doi:10.1016/b978-0-08-096527-7.00032-5

Cited by 6 publications

(8 citation statements)

References 94 publications

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“…Furthermore, angles of cone-like cracks are less acute and defined in the deformed zone of the corroded condition. In ceramic materials, such a trend has been found as R-curve (crack growth resistance) behavior gets less pronounced [68]. Hence, considering that R-curve behavior is directly related to ductile ligament reinforcement behind the crack tip in pristine hardmetals (e.g.…”

Section: Subsurface Damage Scenario: Inspection Of Indented "Clamped-...mentioning

confidence: 99%

Corrosion-induced changes on Hertzian contact damage in cemented carbides

Zheng

Fargas

Lavigne³

et al. 2020

International Journal of Refractory Metals and Hard Materials

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Section: Subsurface Damage Scenario: Inspection Of Indented "Clamped-...mentioning

confidence: 99%

Corrosion-induced changes on Hertzian contact damage in cemented carbides

Zheng

Fargas

Lavigne³

et al. 2020

International Journal of Refractory Metals and Hard Materials

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“…In order to study contact damage phenomena in hard ceramics, it is common practice to use spherical indentation (Hertzian contact) [37,38]. Recently it has also been applied to introduce controlled damage in cemented carbides [39] as well as in coated hardmetals and tool steels [40][41][42][43][44].…”

Section: Evaluation Of Contact Damage Resistancementioning

confidence: 99%

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Yang

Marro

Trifonov

et al. 2015

Surface and Coatings Technology

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Contact loading is a common service condition for coated hardmetal tools and components. Substrate grinding represents a key step within the manufacturing chain of these coated systems. Within this context, the influence of surface integrity changes caused by abrasive grinding of the hardmetal substrate, prior to coating, is evaluated with respect to contact damage resistance. Three different substrate surface finish conditions are studied: ground (G), mirror-like polished (P) and ground plus heat-treated (GTT). Tests are conducted by means of spherical indentation under increasing monotonic load and the contact damage resistance is assessed. Substrate grinding enhances resistance against both crack nucleation at the coating surface and subsequent propagation into the hardmetal substrate. Hence, crack emergence and damage evolution is effectively delayed for the coated G condition, as compared to the reference P one. The observed system response is discussed on the basis of the beneficial effects associated with compressive residual stresses remnant at the subsurface level after grinding, ion-etching, and coating. The influence of the stress state is further corroborated by a lower resistance against damage for the coated GTT specimens. Finally, it is proposed and preliminary validated that substrate grinding also enhances damage tolerance of the coated system when exposed to contact loads. M.P. Johansson-Jõesaar and L. LlanesDear Professor Matthews, Please find attached electronic files corresponding to our contribution on contact damage resistance of TiN-coated hardmetals: beneficial effects associated with substrate grinding, which we (all authors do agree to the submission of the manuscript) offer for publication in Surface and Coatings Technology.I hope it is found satisfactory. (Procedia CIRP, Volume 13, 2014, Pages 257-263).(Authors) R1 is right about connection between results published in our contribution to the 2nd CIRP Conference on Surface Integrity (reference [27] in the submitted manuscript) and those presented in this paper. However, the two papers are distinctly different and cover completely different research topics and contain different data. The former focuses on "ground hardmetals" and "flexural strength/fractography", whereas the current one deals with "coated hardmetals" and "contact damage". Hence, we find R1's comment regarding "similar results" inappropriate. (Authors) Co binder effects on residual stresses are not neglected, and our writing may be blamed for such misunderstanding. Residual stresses induced by grinding are "macrostresses" evaluated in the WC phase and assumed to be representative of the whole WC-Co composite. They are different from the "microstresses" (different for each individual phase) that arise due to the difference in thermal expansion between the binder and the carbide as the material cools from liquid-or solid-phase sintering. In cemented carbides with WC as the carbide, the WC is taken as a reliable reference phase because it remains stoichiometric...

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“…So, Equation ( 12) can written as, (13) Buckling at shell happens while radial load increase until the certain limit, then the shape of virus shell changes from the equilibrium shape. The external load at virus shell until buckling happens is (14) where is the angle buckling of the virus shell. Then substitute Equation (14) to Equation ( 13), we obtain (15)…”

Section: Michell Solutionmentioning

confidence: 99%

“…The external load at virus shell until buckling happens is (14) where is the angle buckling of the virus shell. Then substitute Equation (14) to Equation ( 13), we obtain (15)…”

Section: Michell Solutionmentioning

confidence: 99%

The Stiffness of Virus Shell: Influenza Lipid Shell

Fauzi¹,

Risha²,

Gunadi³

et al. 2021

Proceedings of the 4th International Conference on Innovative Research Across Disciplines (ICIRAD 2021)

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Virus is an infectious agent with microscopic size, a protective shell containing capsomere with protein material called a capsid, and the addition of a shell containing fat called a lipid coat. The one characteristic of a virus is about the shell stiffness, so the virus shell can be assumed as a spring. The value of stiffness of the virus shell is different for various viruses, depending on intrinsic properties (modulus of elasticity) and extrinsic properties (radius and thickness of the virus shell).In this paper, we analyze the value of stiffness of the virus shell by analytical and simulation. The analytical method is based on plate and shell theory and Michell solution. The other, the simulation is based on finite element analysis (FEA) method. For influenza lipid shell, we find that the stiffness value of the shell based on plate and shell theory is 0.0236 . Based on Michell solution, the stiffness value of the shell is 0.0225 . Also, the stiffness value of influenza lipid by FEA method is 0.0227 ± 0.0002 . Generally, based on the graph that the stiffness value of influenza lipid shell by analytical and simulation is approaching same.

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Resistance to Contact Deformation and Damage of Hard Ceramics

Cited by 6 publications

References 94 publications

Corrosion-induced changes on Hertzian contact damage in cemented carbides

Corrosion-induced changes on Hertzian contact damage in cemented carbides

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

The Stiffness of Virus Shell: Influenza Lipid Shell

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