Evaluation of Ultrasonically Determined Elasticity‐Porosity Relations in Zinc Oxide

Martin, L.; Dadon, D.; Rosen, M.

doi:10.1111/j.1151-2916.1996.tb08585.x

Cited by 67 publications

(45 citation statements)

References 34 publications

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“…The modulus of elasticity relations shown in Table 2b requires one or more empirical fitting parameters and the estimate of modulus of elasticity at zero porosity. The fitting parameters are shown to be related to the pore shape and orientation [14].…”

Section: Introductionmentioning

confidence: 99%

“…Effect of porosity on the elasticity modulus of ceramics is the primary application of these models. The semi-empirical estimates of porosity effects on elasticity modulus in ceramics are the primary applications of these models [14,19]. The semi-empirical models evaluated here are presented in Table 2b.…”

Section: Introductionmentioning

confidence: 99%

“…The fourth theoretical model is proposed by Benveniste [1], called the EIAS (Equivalent Inclusion -Average Stress) method, uses the equivalent inclusion idea of Eshelby and the average stress concept of Mori and Tanaka. The theoretical composite material models were primarily used for porous materials such as rocks and ceramics [12,14,30] and to a certain extent for concrete [18,29]. The formulations of the theoretical models are presented in Table 2c.…”

Section: Introductionmentioning

confidence: 99%

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Active and non-active porosity in concrete Part II: Evaluation of existing models

2002

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A B S T R A C T R I~ S U M !~Mechanical, semi-empirical, and theoretical models suitable for describing concrete mechanical properties (modulus of elasticity, bulk modulus, and ultrasonic pulse velocity) are evaluated. Extensive experimental data is generated from saturated and dry concrete specimens with varying volume of active and non-active pores. Experimental data established that active and non-active pores appear at different aspect ratios furthermore, active pores change shape with moisture content. The experimental data is compared to those obtained from these three model categories. Models are evaluated based on their capability in evaluating the effect of pores during dry and saturated states. One model, capable of representing pores at various aspect ratios, was successful in describing mechanical properties in dry and saturated states. ii !! Les r(sultats d' une ~tude visant h ~valuer la fiabilit( de diff(rents modbles permettant de prMire les propri~t~s mdcaniques (module dlastique, vitesse de propagation d'une onde ultrasonique) sont pr(-sent~s. Trois diffdrents types de modkles ont ~td consid~r~s : des modkles m~caniques, semi-empiriques et th~oriques. De nombreuses donne'es exp~rimentales ont ~t( g~n~r~es dans le cadre de cette ~tude. Le programme experimental visait h ~tudier le comportement d'~prouvettes de b~ton sec et humide p@ar~ ~ difl~rentes teneurs en pores actifs (pores capillaires) et non-actifs (vides d' air). Les r~sultats des essais indiquent que les pores actifs et non-actifs ont diff~rents coefficients de forme et que la gkom~trie des pores actifs varie en fonction de la teneur en eau du b(ton. Les prMictions obtenues avec les

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active and non-active porosity in concrete Part II: Evaluation of existing models

2002

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“…In any case, a microstructural analysis of the green compact or partially sintered compact does not provide sufficient information to predict the elastic properties as the sintering progresses, on the basis of these models. [20] All of these theoretical and empirical methods deal with the postsintering elastic behavior. Presently, a great deal of effort is being spent to control porosity variations in the sintered product, by modifying the powderprocessing technique to form green compacts.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Elastic Behavior of Sintered Metal Powder from the Ultrasonic Velocities of Green Compacts

Phani

Sanyal

2008

Metall Mater Trans A

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A novel procedure for the estimation of the elastic properties of the sintered and compacted metal powders from the ultrasonic velocities of the green compact alone has been proposed in this article. The methodology has been validated for sintered iron powder and copper powder compacts as well as for consolidated silver powder compacts of various processing histories, powder sizes, and pore morphology. The predicted elastic moduli, including the derived modulus (Poisson's ratio), are found to be in reasonably good agreement with the measured data reported in the literature. The proposed method can be developed as a potent tool for the quantitative nondestructive evaluation (QNDE) of powder metallurgy products.

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“…This behavior results from the competing effects of the increased stiffness associated with the W reinforcement, and from the reduced stiffness caused by the resultant residual porosity. Ultrasonic sound-wave velocity has been widely applied to the characterization of porous powder compacts, [25][26][27][28] because it is intrinsically related to the elastic moduli (stiffness) and density by the well-known relation…”

Section: A Compaction Behaviormentioning

confidence: 99%

Compaction Behavior and Mechanical Properties of Uniaxially Pressed Bi-W Composites

Martin

Hodge

Campbell

2009

Metall Mater Trans A

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Powder metallurgy is a useful route to forming particulate composite materials; however, the densification of hard and soft powder mixtures is usually inhibited by the more refractory phase. The Bi-W powder compacts were uniaxially pressed at room temperature and the compaction behavior and mechanical properties were evaluated. Pressing was performed in incremental steps from~1 to 540 MPa. After each step, the pressure was relieved and the thickness and sound-wave transit time were measured in situ (in the die), in order to determine the density and sound-wave velocity in the compact. The data show that the unreinforced Bi powder compacts to~98 pct density at 540 MPa. The W reinforcement inhibits the densification process, resulting in increased levels of residual porosity. The compaction behavior was evaluated using a modified Heckel equation, while the porosity dependence of the ultrasonically determined elastic modulus was described by a site percolation approach. Postcompaction sound-wave velocity and Vicker's hardness measurements show <5 pct anisotropy between the axial (pressing) and radial directions. The mechanical characterization illustrates the competing effects of the W reinforcement and the associated residual porosity.

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Evaluation of Ultrasonically Determined Elasticity‐Porosity Relations in Zinc Oxide

Cited by 67 publications

References 34 publications

Active and non-active porosity in concrete Part II: Evaluation of existing models

Active and non-active porosity in concrete Part II: Evaluation of existing models

Prediction of Elastic Behavior of Sintered Metal Powder from the Ultrasonic Velocities of Green Compacts

Compaction Behavior and Mechanical Properties of Uniaxially Pressed Bi-W Composites

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