Fractography of Thermistors

Dänzer, Robert; Platzer, Alexander; Supancic, Peter; Wang, Zhonghua

doi:10.1002/9781118144152.ch18

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Thus, more brittle materials are much more prone to edge damage. Danzer et al [3] have shown similar linear relationships for a silicon nitride valve material, and conclude that edge toughness is proportional to G Ic 1/2 . Morrell and Gant [4] have shown that the linear relationship may hold well for low toughness materials, but may break down in materials of K Ic in excess of about 8 MPa m 1/2 as a consequence of plastic deformation.…”

Section: Introductionmentioning

confidence: 74%

Edge Flaking - Similarity between Quasistatic Indentation and Impact Mechanisms for Brittle Materials

Morrell

2005

KEM

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The process of edge flaking of brittle materials is a significant limitation in design, handling and use of components. Simple quasistatic tests to identify resistance to edge flaking can be based on near-edge indentation and scratching towards an edge, and these produce rankings of materials that broadly correlate with GIc or KIc. However, most edge damage occurs in practice by impact. Using a drop-weight impact tester, edge chipping tests have been performed dynamically on a range of brittle materials, using repeated impact with step-wise height increments until fracture. It has been found that when impact energy rather indentation force is used as the correlative parameter against distance of the impact site from the edge of the test-piece, a similar relationship to that of quasistatic indentation is found. The shapes of edge flakes produced may also similar. This suggests that even when a relatively blunt impactor is used, compared with conventional indenters, the mechanics of the failure are similar. However, the occurrence of ring cracks can lead to unusual flake shapes. It follows that simpler-to-perform quasistatic tests can model the less well-defined dynamic impact situation in terms of testing for the effects of geometry or for comparing performance of different material types.

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Section: Introductionmentioning

confidence: 74%

Edge Flaking - Similarity between Quasistatic Indentation and Impact Mechanisms for Brittle Materials

Morrell

2005

KEM

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“…Also, several researches investigated the critical indent force F required for edge chipping and found that there were linear correlation between F and d (Chai and Lawn 2007a;Gogotsi and Mudrik 2009;Gogotsi et al 2007;Morrell and Gant 2001). The ratio of F to d is referred to as "edge toughness" and the edge toughness depends only on the investigated material and the indenter geometry (Danzer and Hangl 2001). Therefore, several attempts have been made to predict the fracture toughness K c from the edge toughness whose value is given by the edge chipping test (Chai and Lawn 2007b;Danzer and Hangl 2001;Gogotsi 2013;Gogotsi and Mudrik 2009;Gogotsi et al 2007;Morrell and Gant 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The ratio of F to d is referred to as "edge toughness" and the edge toughness depends only on the investigated material and the indenter geometry (Danzer and Hangl 2001). Therefore, several attempts have been made to predict the fracture toughness K c from the edge toughness whose value is given by the edge chipping test (Chai and Lawn 2007b;Danzer and Hangl 2001;Gogotsi 2013;Gogotsi and Mudrik 2009;Gogotsi et al 2007;Morrell and Gant 2001). For example, Chai and Lawn (2007b) performed the edge chipping tests of soda-lime glass by Vickers indentation and reported that they could provide the value of K c directly from the critical indent force F to within an accuracy of about 25%.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of glass edge chipping by impact loading

Hirobe

Sato²,

Takato³

et al. 2023

Preprint

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This study presents numerical analyses for edge chipping by impact loading. As a numerical analysis method, we extend Particle Discretization Scheme Finite Element Method (PDS-FEM) developed by the authors to be able to simulate fracture due to impact loading. We performed simulations targeting edge chipping of soda-lime glass by impact of rigid iron sphere and examined the crack morphology while varying the diameter of the impactor, the impact velocity, and the impact distance. The proposed method successfully simulates the 3D complex crack pattern on edge chipping such as Hertzian cone crack and conchoidal chip scar. The method also reproduces the change of crack morphologies depending on the impact force and the impact distance. Also, a series of numerical analyses are presented to reveal the effect of the impactor geometry on the chip dimensions. The height of chip is independent of the impactor geometry while the width of chip depends on it. According to the agreement with experimental results, it is confirmed that the proposed method is capable of realizing edge chipping due to impact loading.

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A History of the Fractography of Glasses and Ceramics

Quinn

2012

Ceramic Transactions Series

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Fractography of Thermistors

Cited by 3 publications

References 13 publications

Edge Flaking - Similarity between Quasistatic Indentation and Impact Mechanisms for Brittle Materials

Edge Flaking - Similarity between Quasistatic Indentation and Impact Mechanisms for Brittle Materials

Numerical analysis of glass edge chipping by impact loading

A History of the Fractography of Glasses and Ceramics

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