A 1D Ritz–Jacobi formulation for the modal analysis of 3D anisotropic laminated composite and soft-core sandwich beam structures through 2D polynomials

2021 ◽  
Vol 169 ◽  
pp. 108428
Author(s):  
Fiorenzo A. Fazzolari ◽  
Samuel Scott ◽  
Francesco Tornabene
Keyword(s):  
Modal Analysis ◽  
Sandwich Beam ◽  
Laminated Composite ◽  
Soft Core ◽  
Beam Structures ◽  
Jacobi Formulation

Dynamic behaviour of soft core sandwich beam structures using kriging-based layerwise models

2015 ◽  
Vol 134 ◽  
pp. 883-894 ◽  
Author(s):  
M.A.R. Loja ◽  
J.I. Barbosa ◽  
C.M. Mota Soares
Keyword(s):  
Dynamic Behaviour ◽  
Sandwich Beam ◽  
Soft Core ◽  
Beam Structures

scholarly journals Looseness localization for bolted joints using Bayesian operational modal analysis and modal strain energy

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401880869 ◽  
Author(s):  
Yu-Jia Hu ◽  
Wei-Gong Guo ◽  
Cheng Jiang ◽  
Yun-Lai Zhou ◽  
Weidong Zhu
Keyword(s):  
Modal Analysis ◽  
Strain Energy ◽  
Damage Index ◽  
Operational Modal Analysis ◽  
Modal Identification ◽  
Bolted Joints ◽  
Mode Shapes ◽  
Bolted Connections ◽  
Modal Strain Energy ◽  
Beam Structures

Bayesian operational modal analysis and modal strain energy are employed for determining the damage and looseness of bolted joints in beam structures under ambient excitation. With this ambient modal identification technique, mode shapes of a damaged beam structure with loosened bolted connections are obtained based on Bayesian theory. Then, the corresponding modal strain energy can be calculated based on the mode shapes. The modal strain energy of the structure with loosened bolted connections is compared with the theoretical one without bolted joints to define a damage index. This approach uses vibration-based nondestructive testing of locations and looseness of bolted joints in beam structures with different boundary conditions by first obtaining modal parameters from ambient vibration data. The damage index is then used to identify locations and looseness of bolted joints in beam structures with single or multiple bolted joints. Furthermore, the comparison between damage indexes due to different looseness levels of bolted connections demonstrates a qualitatively proportional relationship.

scholarly journals The Vibration Response of Composite Sandwich Beam with Delamination

2007 ◽  
Vol 16 (2) ◽  
pp. 096369350701600 ◽  
Author(s):  
Buket Okutan Baba ◽  
Ronald F. Gibson
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Sandwich Beam ◽  
Laminated Composite ◽  
Sandwich Beams ◽  
Element Analysis ◽  
Composite Sandwich ◽  
Dimensional Finite Element ◽  
Vibration Tests ◽  
Non Destructive

The aim of this study is to report the effect of delamination on the vibration characteristics of composite sandwich beams. The natural frequencies and corresponding vibration modes of a free-free sandwich beam with delamination of various sizes and locations are predicted using a two-dimensional finite element analysis (FEA). The presence of delamination affects the stiffness of the delaminated beam and results in differences on the natural frequencies of the beam. Assessment of the differences light the way for the existence, size and location of the delaminated region and can be used for a non-destructive evaluation of the damage characteristics of the delaminated beams. Vibration tests are conducted on fully bonded sandwich beams with carbon/epoxy laminated composite faces and foam core to verify the finite element results. Agreement between predictions of the model and experimental observations is good.

Optimal design of laminated composite beam structures

2002 ◽  
Vol 24 (3) ◽  
pp. 205-211 ◽  
Author(s):  
J. B. Cardoso ◽  
L. G. Sousa ◽  
J. A. Castro ◽  
A. J. Valido
Keyword(s):  
Optimal Design ◽  
Composite Beam ◽  
Laminated Composite ◽  
Beam Structures ◽  
Laminated Composite Beam

scholarly journals Buckling analysis of laminated sandwich beam with soft core

2012 ◽  
Vol 9 (3) ◽  
pp. 1-15 ◽  
Author(s):  
Anupam Chakrabarti ◽  
H.D Chalak ◽  
Mohd. Ashraf Iqbal ◽  
Abdul Hamid Sheikh
Keyword(s):  
Sandwich Beam ◽  
Buckling Analysis ◽  
Soft Core

scholarly journals Modal Analysis of Beam Structures with Random Field Models at Multiple Scales

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Dan Feng
Keyword(s):  
Random Field ◽  
Modal Analysis ◽  
Material Properties ◽  
Multiple Scales ◽  
Heterogeneous Material ◽  
Modal Parameters ◽  
Fe Method ◽  
Length Scales ◽  
Beam Structures ◽  
Random Field Theory

Structure material properties are heterogeneous in nature and would be characterized with different statistics at different length scales due to the spatially averaging effects. This work develops a framework for the modal analysis of beam structures with random field models at multiple scales. In this framework, the random field theory is adopted to model heterogeneous material properties, and the cross-correlations between material properties are explicitly considered. The modal parameters of a structure are then evaluated using the finite element (FE) method with the simulated heterogeneous material properties taken as input. With the aid of Monte Carlo simulation, the modal parameters are analyzed in a probabilistic manner. In addition, to accommodate the necessity of different mesh sizes in FE models, an approach of evaluating random field parameters and generating random field material properties at different length scales is developed. The performance of the proposed framework is demonstrated through the modal analysis of a simply supported beam, where the formulation of the multiscale random field approach is validated and the effects of heterogeneous material properties on modal parameters are analyzed. Parametric studies on the random field parameters, including the coefficient of variation and the scale of fluctuation, are also conducted to further investigate the relations between the random field parameters at different scales.

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