Free Vibration of Clamped Orthotropic Sandwich Panel

Lok, T.S.; Cheng, Q.H.

doi:10.1006/jsvi.1999.2485

Cited by 61 publications

(42 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The method seems to slightly underestimate the modal frequencies, but is much more accurate than methods which consider only the orthotropic ESL layer response (e.g. Lok and Cheng, 2000). Magnitude of the error grows slightly towards modes with shorter global wavelengths.…”

Section: Resultsmentioning

confidence: 86%

“…For static case this limitation can be corrected using simple superposition principle as was shown by , but in vibration the problem is more complex. Existing equivalent elements used for vibration analysis of sandwich panels: Kolsters and Wennhange (2009), Lok and Cheng (2000) and Lok and Cheng (2001) do not consider local deformation effects on vibration either. In order to correct this, Avi, Laakso, et al (2015) proposed approach to correct natural frequencies of the equivalent element results by combining them with the local plate frequencies, which were separately calculated using sub-modelling technique.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements

Laakso

Avi

Romanoff

2019

Ships and Offshore Structures

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements

Laakso

Avi

Romanoff

2019

Ships and Offshore Structures

View full text Add to dashboard Cite

“…[17,18]. Homogenization of the orthotropic, corrugated-core sandwich panel was considered in the case of torsion [19], static thermal loads [20] and a free vibration problem [21].…”

Section: Introductionmentioning

confidence: 99%

Structural behavior of sandwich panels with asymmetrical boundary conditions

Studziński

Pozorski

Garstecki

2015

Journal of Constructional Steel Research

View full text Add to dashboard Cite

“…In sandwich panels with unidirectional core, the transverse shear stiffness perpendicular to the stiffeners could be several orders of magnitude smaller than in the direction of the stiffeners. It is very important to calculate these transverse shear stiffnesses accurately, which has attracted significant interest in the past [20, 21, 23, 24] as they considerably affect deflections and stress concentrations [23, 25, 26], buckling loads [27–29] and natural frequencies [30, 31].…”

Section: Introductionmentioning

confidence: 99%

Buckling of sandwich panels with transversely flexible core: Correction of the equivalent single-layer model using thick-faces effect

Jelovica

Romanoff

2018

Jnl of Sandwich Structures & Materials

View full text Add to dashboard Cite

Modeling a periodic structure as a homogeneous continuum allows for an effective structural analysis. This approach represents a sandwich panel as a two-dimensional plate of equivalent stiffness. Known as the equivalent single-layer, the method is used here to analyze bifurcation buckling of three types of sandwich panels with unidirectional stiffeners in the core: truss-core, web-core and corrugated-core panels made of an isotropic material. The transverse shear stiffnesses of these panels can differ by several orders of magnitude, which cause incorrect buckling analysis when using the equivalent single-layer model with the first-order shear deformation theory. Analytical solution of the problem predicts critical buckling loads that feature infinite number of half-waves in the direction perpendicular to the stiffeners. Finite element model also predicts buckling modes that have non-physical, saw-tooth shape with infinite curvature at nodes. However, such unrealistic behavior is not observed when using detailed three-dimensional finite element models. The error in the prediction of the critical buckling load is up to 85% for the cases considered here. The correction of the equivalent single-layer model is proposed by modeling the thick-faces effect to ensure finite curvature. This is performed in the finite element setting by introducing an additional plate with tied deflections to the equivalent single-layer plate. The extra plate is represented with bending and transverse shear stiffness of the face plates. As a result, global buckling is predicted accurately. Guidelines are proposed to identify the sandwich panels where ordinary model is incorrect. Truss-core and web-core sandwich panels need the correction. Corrugated-core panels without a gap between plates in the core have smaller shear orthotropy and do not need the correction. Modeling the thick-faces effect ensures correct results for all cases considered in this study, and thus one should resort to this approach in case of uncertainty whether the ordinary equivalent single-layer model is valid.

show abstract

Free Vibration of Clamped Orthotropic Sandwich Panel

Cited by 61 publications

References 7 publications

Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements

Correction of local deformations in free vibration analysis of ship deck structures by equivalent single layer elements

Structural behavior of sandwich panels with asymmetrical boundary conditions

Buckling of sandwich panels with transversely flexible core: Correction of the equivalent single-layer model using thick-faces effect

Contact Info

Product

Resources

About