Effect of specimen geometry on strength in engineering ceramics

Hoshide, Toshihiko; Murano, Jun; Kusaba, R

doi:10.1016/s0013-7944(97)00124-0

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…The former was basically greater than the later. The mean strengths and its standard deviations were 23.7±2.70 and 22.3±2.12 MPa, which was consistent with the variation of the mean strength of sintered silicon nitride and alumina as well as the decrease of standard deviation with the specimen size [22][23][24] . The probability of existence a critical flaw in a large sample was higher than the small one 25 , so the smaller samples presented higher strength.…”

Section: Resultssupporting

confidence: 78%

Size Effects on Fracture Parameters of High Alumina Refractories

et al. 2018

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The randomness of phase compositions and their distribution as well as the micro cracks and pores in refractories result in the dependence of mechanical properties on the sample size. In this work, the size effects on fracture parameters including bending strength, elastic modulus and fracture toughness of high alumina bricks were investigated by testing samples of different sizes according to the national standard in China. The results showed that the smaller samples presented higher strength, while the larger samples possessed greater elastic modulus. Weibull modulus m of bending strength for high alumina bricks calculated for samples of two sizes, each group featured 32 samples, ranged from 11 to 12, which was higher than in other refractories such as low grade high alumina, magnesia-carbon and magnesia-chrome bricks. The scatter of the average strength and its standard deviation became stable when the sample number was more than 20. The fractal dimension of fracture surface for high alumina bricks was inversely and directly proportional to the sample size and the fracture toughness, respectively. The estimated fracture toughness of high alumina bricks was close to window glass and less than alumina and mullite.

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Section: Resultssupporting

confidence: 78%

Size Effects on Fracture Parameters of High Alumina Refractories

et al. 2018

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“…The figure shows the decrease in the strength with increasing the effective volume in the materials with respective porosities. This trend coincides with the results observed in dense ceramic materials 5–7,12–16 …”

Section: Correlation Of Strength With Effective Volume Parameterssupporting

confidence: 92%

“…On the other hand, the stress distribution in a notched specimen is usually unknown, so the volume integral is replaced with a summation. In this study, the effective volume of a notched specimen is evaluated by using the stress distribution given in a finite element analysis 14 and is formulated as…”

Section: Statistical Analysis Of Strength In Porous Ceramicsmentioning

confidence: 99%

“…However, previous work 1 suggests that fracture mechanics procedures are not always applicable to describe fracture behaviour of porous ceramics. It is also recognised that the strength properties of ceramic components are affected by their geometric sizes and shapes associated with the loading mode 2–14 . A new approach for porous ceramics is required in the evaluation of the size effect on strength as well as statistical strength properties.…”

Section: Introductionmentioning

confidence: 99%

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A statistical approach to strength evaluation incorporating porosity effect for porous ceramics

Hoshide¹,

Abe²

2003

Fatigue Fract Eng Mat Struct

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It has not been clear whether the conventional effective volume proposed for dense brittle materials can be applied satisfactorily to the strength evaluation of porous ceramics. In the present study, a modified effective volume was proposed by incorporating the porosity effect in the statistical evaluation of strength properties of porous ceramics. The modified effective volume was derived as the conventional effective volume multiplied by a function of porosity p. In this work, a power function of (1 + p)a was adopted as the simplest porosity function. To clarify the applicability of the modified effective volume, bending tests were conducted using smooth and notched specimens of 3 wt% MgO partially stabilised zirconia with six different porosities. The porosity dependence appeared in the relation between the conventional effective volume and the mean strength of various zirconia ceramics with different porosities. The exponent a of the porosity function was determined from experimental data obtained by using identically shaped specimens with distinct porosities, and the modified effective volume was calculated for several types of specimens used in the experiments. It was revealed that the mean strength was almost uniquely correlated with the modified effective volume independent of porosity. The experimental correlation verified the applicability of the modified effective volume to strength evaluation of porous ceramics.

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“…The displayed variability in the value of m and k (for glass panels obtained from the same source and manufacturing processes) contradicts with the notion of taking a single m value to represent ''average conditions" as reported in the literature (ASTM-E1300, 2007Hoshide et al, 1998). This observation reaffirms previous findings (Afferante et al, 2006;Kotrechko, 2003;Zwaag, 1989) that the Weibull parameter m is not a material constant.…”

Section: Strength Distribution Of Annealed Glass Panels From Physicalsupporting

confidence: 51%

Estimation of strengths in large annealed glass panels

Nurhuda

Lam

Gad

et al. 2010

International Journal of Solids and Structures

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a b s t r a c tA new model of the Log-Normal form for predicting the cumulative probabilistic distribution of strength in annealed glass panels is presented in this paper. The proposed model, which is supported by experimental evidences, shares certain features that are common with predictions by the Weibull's model. However, as the dimension of the panel is above a certain limit, the strength of glass as predicted by the new model is much less sensitive to any further increase in the panel dimension than strength predicted by the Weibull's model. This has important implications to the engineering design and risk assessments of glass facades in the future. The proposed alternative model was derived from results obtained from Monte Carlo simulations of non-interacting Griffith flaws based on principles of fracture mechanics. As interactions between flaws have been neglected in the analyses presented in the paper, the proposed model is intended to be applicable to glazing panels which contain widely spaced flaws. Results from physical experimentation in support of the simulation model have been presented in the paper.

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Effect of specimen geometry on strength in engineering ceramics

Cited by 12 publications

References 19 publications

Size Effects on Fracture Parameters of High Alumina Refractories

Size Effects on Fracture Parameters of High Alumina Refractories

A statistical approach to strength evaluation incorporating porosity effect for porous ceramics

Estimation of strengths in large annealed glass panels

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