Rapid Determination of the Tensile Strength of Rocks with Irregular Test Pieces

Hiramatsu, Yoshio; Oka, Yoshikazu; Kiyama, Hideo

doi:10.2473/shigentosozai1953.81.932_1024

Cited by 71 publications

(27 citation statements)

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“…The mean microcompressive strength was calculated using C=2.8P/d² 23) , where P is the maximum load (N) and d is the diameter (mm) of the particle (n=6). The specific surface areas of four HAp-particles were measured by a Brunauer-Emmet-Teller (BET) nitrogen gas adsorption method 24) using an automated surface area and porosimetry analyzer (TriStar 3000, Micromeritics Instrument Co., Norcross, GA).…”

Section: Methodsmentioning

confidence: 99%

Hydroxyapatite particle characteristics influence the enhancement of the mechanical and chemical properties of conventional restorative glassionomer cement

et al. 2011

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The aims of this study were to improve the mechanical and chemical properties of conventional restorative glass ionomer cement (GIC) by adding hydroxyapatite (HAp) preparations with different characteristics, and to investigate the underlying reaction mechanisms. Fuji IX GP ® was used as the control GIC. The experimental GICs consisted of four HAp-particles with different characteristics added at 8 mass% to Fuji IX-powder. All cements were prepared by mixing with Fuji IX-liquid (P/L=3.6). Four HApparticles were analyzed, and then the mechanical strengths and the fluoride-ion-release-recharge-behaviors of five GIC groups were evaluated. The results of this study demonstrate that the addition of HAp particles with highly reactive properties such as high specific surface area can enhance the flexural strength and fluoride ion release properties of conventional restorative GIC. Our results further indicate that HAp functions as an adsorbent and an ion exchangeable agent, resulting in improved mechanical and chemical properties of GIC.

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Section: Methodsmentioning

confidence: 99%

Hydroxyapatite particle characteristics influence the enhancement of the mechanical and chemical properties of conventional restorative glassionomer cement

et al. 2011

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“…The fracture strength (S t ) of the particle was estimated by applying the Hiramatsu method 16) as described in Eq. (3), where F c is the critical force mentioned above and d is the particle diameter that was measured with an optical microscope before each compression test.…”

Section: Fracture Energy Of Sintered Particles and Cvd Particlesmentioning

confidence: 99%

Effect of process for producing Al<sub>2</sub>O<sub>3</sub> particles on deposition efficiency in aerosol deposition method

Naoe

Sato

Nishiki

2014

J. Ceram. Soc. Japan

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The aerosol deposition method (ADM) is a technique to form dense films by impacting solid particles on a substrate. Dense ceramic films with thicknesses of over several¯m can be formed directly on substrates even at room temperature by the ADM. In this study, to improve the deposition efficiency of the ADM, the effect of the process for producing Al 2 O 3 particles on the deposition efficiency was investigated. Two types of commercially available ¡-Al 2 O 3 particles produced by sintering Al(OH) 3 (sintered particle) and chemical vapor deposition (CVD particle) were used. The average deposition efficiency of the sintered particles ranged from 0.067 to 0.088% and was much higher than that of the CVD particles, which ranged from 0.005 to 0.012%. When the sintered particles were used, the AD films grew about 30¯m. In contrast, when the CVD particles were used, the AD films didn't grow over several¯m. The morphologies of the AD films suggested that the deformed volume of the sintered particles was larger than that of the CVD particles. The specific fracture energy of each particle was estimated from a compression test. The average specific fracture energy of the sintered particles was 7.3 © 10 7 J/m 3 , which was about 32% of that of the CVD particles (2.3 © 10 8 J/m 3 ). Comparing this specific fracture energy with the specific kinetic energy, which was estimated to range from 4.4 © 10 7 to 1.8 © 10 8 J/m 3 , there is a possibility that the sintered particles showed higher deposition efficiency because they could deform by their kinetic energy and easily form activated surface promoting the bonding between the ceramic particles. We conclude that the specific fracture energy of the particle depends on the process for producing it and could be the crucial property to focus on to improve the deposition efficiency.

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“…Furthermore, the breaking load of the particle F, is related to the compressive breaking stress P, as follows (Hiramatsu et al, 1965);…”

Section: (A) X80mentioning

confidence: 99%

Morphological Change of Hardened Oil Particles Induced by Impaction against a Solid Surface

Fukui

Suzuki

Masuda

et al. 1997

Aerosol Science and Technology

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ABSTRACT. The morphological change of fine particles induced by impaction against a solid surface has been investigated for two types of tristearin fine particles which have different mass median diameters. It is found that the bulk density of the heap formed on the solid surface increases with increasing the impaction velocity and the mass median diameter of the tested powder. The change in the bulk density can be evaluated by the effective impaction load which is calculated by the theory of elasticity, considering the particle size distribution and the mechanical properties of particles. The heap formed on the solid surface at low impaction load consists of fine particles, while at high impaction load, it consists of a caked heap where no particles are found. AEROSOL SCIENCE AND TECHNOLOGY 26:343-3% (1997 compression load (N) effective impaction load applied on a single particle (N) mass of the heap (mg) mass of particle (kg) coefficient of uniformity of breaking stress distribution ( -) compressive breaking stress (Pa) clean sheath air flow rate (m3/s) aerosol flow rate (m3/s) mixing ratio (-) air velocity at impactor jet (m/s) u impaction velocity (m/s) V particle volume (m3) E; Young's modulus of particle (Pa) a flow rate ratio ( = Q,/Qp) (-) vi Poisson's ratio of particle (-) pH bulk density of the heap (kg/m3)

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Rapid Determination of the Tensile Strength of Rocks with Irregular Test Pieces

Cited by 71 publications

References 0 publications

Hydroxyapatite particle characteristics influence the enhancement of the mechanical and chemical properties of conventional restorative glassionomer cement

Hydroxyapatite particle characteristics influence the enhancement of the mechanical and chemical properties of conventional restorative glassionomer cement

Effect of process for producing Al<sub>2</sub>O<sub>3</sub> particles on deposition efficiency in aerosol deposition method

Morphological Change of Hardened Oil Particles Induced by Impaction against a Solid Surface

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