Addendum to "Chiral composites as underwater acoustic attenuators"

Yang, Shiuh‐Kuang; Hsia, Shao‐Yi

doi:10.1109/joe.2000.855410

Cited by 2 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, Yang and Hsia in their discussion on wave propagation between fluid-chiral and elastic-chiral interfaces have hypothesized the value of the modulus. 11,12) In this paper, real moduli are obtained from Lakes' experimental study. 13) Lakes intended to explore experimentally the microelastic behavior of dense isotropic porous materials that were high-density rigid polyurethane closed-cell foam and syntactic foam consisting of hollow glass microbubbles embedded in an epoxy matrix.…”

Section: Summary Of Micropolar Porous Theorymentioning

confidence: 99%

“…Nevertheless, it is important to point out that, in the cases where acoustic waves are incident at a boundary between two micropolar media, the material constants of the media do not represent typical behavior for most materials in comparison with experimental data. 11) Furthermore, the assumption of elastic constants which is used in Tomar and Gogna's work is not sufficient to describe real problems. 12) In this paper, therefore, the boundary conditions and elastic constants obtained from experimental data are considered to calculate the reflection and transmission of longitudinal plane wave propagation reasonably.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Longitudinal Plane Wave Propagation in Elastic-Micropolar Porous Media

Hsia¹,

Cheng

2006

jjap

View full text Add to dashboard Cite

Porous materials are widely used in the passive noise control field as sound absorbers. Conventional models of porous materials are assumed to have a rigid frame and to satisfy finite bulk elasticity. However, it may be the case that when high-frequency sound is applied to porous materials for nanotechnology applications, the classical theory of elasticity cannot be satisfied. Generalized continuum theories, such as coupled stress theory and micropolar theory, have additional degrees of freedom compared with classical elasticity. It is hence assumed that such theories are applicable to composites with granular structure. In this study, two of the six material constants are obtained from experimental results on micropolar porous solids by Lakes. At the same time, a theoretical analysis concerning reflected and transmitted fields of an incident longitudinal plane wave propagating in elastic-micropolar porous media has been investigated. The results show that two fields are affected by micropolar porous characteristics. The boundary value problem of micro elasticity is also investigated in this paper.

show abstract

Section: Summary Of Micropolar Porous Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Longitudinal Plane Wave Propagation in Elastic-Micropolar Porous Media

Hsia¹,

Cheng

2006

jjap

View full text Add to dashboard Cite

show abstract

“…Then, Tomar and Gogna 6) extended the investigation to a longitudinal microrotational wave impinging at a plane discontinuity between two micropolar elastic solids in welded contact. Simultaneously, Yang and Hsia, 7) and Lakhtakla et al 8) presented an excellent theoretical model concerning the reflection phenomena when an incident plane wave is propagating at the interface between an elastic solid and a chiral material. This paper was intended to theoretically explore the acoustical behavior of porous materials when some of the experimental elastic constants and the fields of wave propagation are known.…”

Section: Introductionmentioning

confidence: 99%

Propagation of Transverse Waves in Elastic-Micropolar Porous Semispaces

Hsia

Chiu

et al. 2007

jjap

View full text Add to dashboard Cite

Porous materials are widely used in the passive noise control field as sound absorbers. Conventional models of porous materials are assumed to have a rigid frame and show finite bulk elasticity. However, in the case of acoustical wavescharacterized by high frequencies and small wavelengths -the effect of microstructure becomes significant. This effect of microstructure has resulted in the development of new types of waves, not found in the classical theory of elasticity. Generalized continuum theories include the construction of the linear theory of micropolar elasticity that consists of deformation and microrotation with six degrees of freedom, and hence can be used to study the acoustical characteristics of composites with a granular structure. In this study, we investigated transverse wave propagation and its reflection and transmission from a plane interface between two different elastic-micropolar porous interfaces in perfect contact. The micropolar porous composite was constructed using hollow glass microbubbles embedded in an epoxy matrix with six material constants that can be used as the acoustical absorbers. It was found that there are different wave types in a micropolar porous material for the incident SV (vertical transverse) or SH (horizontal transverse) wave. It was also found that these two coupled sets of transverse waves, when traveling with different velocities, are dominated by the critical value of microinertia, showing the influence of the micropolar porous characteristics.

show abstract

Addendum to "Chiral composites as underwater acoustic attenuators"

Cited by 2 publications

References 1 publication

Longitudinal Plane Wave Propagation in Elastic-Micropolar Porous Media

Longitudinal Plane Wave Propagation in Elastic-Micropolar Porous Media

Propagation of Transverse Waves in Elastic-Micropolar Porous Semispaces

Contact Info

Product

Resources

About