Strength of ceramic materials containing small flaws

Usami, Saburo; Kimoto, Hiroshi; Takahashi, Ikuo; Suzuki, Shigeru

doi:10.1016/0013-7944(86)90120-7

Cited by 99 publications

(50 citation statements)

References 21 publications

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“…Therefore fracture toughness was determined in notched three-point bending specimens without pre-cracking. A relation between fracture toughness of notched and cracked specimens (K c,n ) and K IC , respectively, was considered, based on cleavage rupture criteria [21]:…”

Section: Article In Pressmentioning

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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Section: Article In Pressmentioning

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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show abstract

“…In particular surface defects have a strong influence on their strength [32]. Furthermore, even a moderate porosity can have a substantial impact on their elastic modulus, strength and resistance to contact damage [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Selective etching of injection molded zirconia-toughened alumina: Towards osseointegrated and antibacterial ceramic implants

et al. 2016

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Due to their outstanding mechanical properties and excellent biocompatibility, zirconiatoughened alumina (ZTA) ceramics have become the gold standard in orthopedics for the fabrication of ceramic bearing components over the last decade. However, ZTA is bioinert, which hampers its implantation in direct contact with bone. Furthermore, periprosthetic joint infections are now the leading cause of failure for joint arthroplasty prostheses. To address both issues, an improved surface design is required: a controlled micro-and nano-roughness can promote osseointegration and limit bacterial adhesion whereas surface porosity allows loading and delivery of antibacterial compounds. In this work, we developed an integrated strategy aiming to provide both osseointegrative and antibacterial properties to ZTA surfaces. The microtopography was controlled by injection molding. Meanwhile a novel process involving the selective dissolution of zirconia (selective etching) was used to produce nano-roughness and interconnected nanoporosity. Potential utilization of the porosity for loading and delivery of antibiotic molecules was demonstrated, and the impact of selective etching on mechanical properties and hydrothermal stability was shown to be limited. The combination of injection molding and selective etching thus appears promising for fabricating a new generation of ZTA components implantable in direct contact with bone.3

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“…It has been reported, however, that the fracture originating from a smaller flaw in ceramics occurs at a lower stress than that predicted on the basis of the planestrain fracture toughness criterion [1][2][3][4]. This suggests that it is dangerous to estimate the strength of a ceramic component by using fracture mechanics parameters obtained for large cracks.…”

Section: Introductionmentioning

confidence: 79%

Dependence of Strength on Size of Flaw Dominating Fracture in Ceramics

Hoshide¹,

Masuda²

1995

Journal of the Society of Materials Science, Japan

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Bending tests using a silicon nitride and an alumina were carried out under 4-point bending to clarify the relation between the strength and the size of flaw observed at a fracture origin. When the fracture originated from a smaller flaw, the strength was confirmed to be lower than that expected from the fracture toughness criterion. A convenient procedure using the mean strength and the fracture toughness was proposed to estimate the strength degradation depending on flaw size. A new model was also developed assuming the stable cracking caused by the separation per one grain ahead of a flaw prior to the final unstable fracture. A Monte Carlo simulation based on the proposed model was made to explain the anomalous behavior of small flaw. The relation of strength vs. crack length simulated by taking account of grain-size distribution showed good agreement with the experimental result. The lower bound in scatter of strength depending on flaw-size was suggested to be estimated by using the size of the largest grain expected in a material.

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Strength of ceramic materials containing small flaws

Cited by 99 publications

References 21 publications

A study on the mechanical behaviour of WC/Co hardmetals

A study on the mechanical behaviour of WC/Co hardmetals

Selective etching of injection molded zirconia-toughened alumina: Towards osseointegrated and antibacterial ceramic implants

Dependence of Strength on Size of Flaw Dominating Fracture in Ceramics

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