High-order layerwise mechanics and finite element for the damped dynamic characteristics of sandwich composite beams

2004 ◽  
Vol 41 (24-25) ◽  
pp. 6853-6871 ◽  
Author(s):  
Theofanis S. Plagianakos ◽  
Dimitris A. Saravanos
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Composite Beams ◽  
High Order ◽  
Sandwich Composite

Dynamic characteristics of sandwich composite with debonding

2018 ◽  
Vol 32 (9) ◽  
pp. 1204-1223
Author(s):  
M Idriss ◽  
A El Mahi
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Flexural Vibration ◽  
Experimental Tests ◽  
Core Material ◽  
Sandwich Composite ◽  
Dissipated Energy ◽  
Stress And Strain ◽  
Sandwich Composites ◽  
Modal Strain Energy

The article presents the results of experimental and finite element analyses of the flexural vibration behavior sandwich composite with different debonding ratios. Sandwich composite consists of two thin skins composed of E-glass fiber and epoxy resin bonded to lightweight and weaker core material of PVC foams. Experimental tests using the impulse technique were performed on the sandwich constituents and sandwich composites with different debonding lengths. The modal dynamic characteristics of sandwich composite were measured and discussed for each debonding ratio. A finite element modeling was used to determine the natural frequencies, modal shapes, and stress and strain fields for each element of sandwich composites for each debonding ratio. The modal strain energy approach was used to determine the contribution of energies dissipated of the core and the skins in the total dissipated energy and the global damping of the different sandwich composites. The results obtained by this approach are compared with those obtained experimentally.

Finite Element Analysis of the Vibration Characteristics of Castellated Composite Beams

2014 ◽  
Vol 513-517 ◽  
pp. 91-94
Author(s):  
Bao Chu Yu ◽  
Guo Dong Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Vibration Frequency ◽  
Composite Beam ◽  
Composite Beams ◽  
Vibration Characteristics ◽  
Steel Beam ◽  
Element Analysis ◽  
New Form

Steel-concrete castellated composite beams are a new form, also widely used in bridges and buildings. But the research for the vibration characteristics of the composite beams is less. In this paper, by using the principle of the finite element, it mainly analyzes the influence of some related elements, such as the steel beam web part of the opening location, the size, the location and so on, on composite beam vibration frequency to lay the foundation of further study on the dynamic characteristics of the castellated composite beam.

scholarly journals A New Mixed Functional-probabilistic Approach for Finite Element Accuracy

2020 ◽  
Vol 20 (4) ◽  
pp. 799-813
Author(s):  
Joël Chaskalovic ◽  
Franck Assous
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Asymptotic Relation ◽  
Probabilistic Approach ◽  
Random Variable ◽  
High Order ◽  
Relative Accuracy ◽  
The Difference ◽  
New Perspective

AbstractThe aim of this paper is to provide a new perspective on finite element accuracy. Starting from a geometrical reading of the Bramble–Hilbert lemma, we recall the two probabilistic laws we got in previous works that estimate the relative accuracy, considered as a random variable, between two finite elements {P_{k}} and {P_{m}} ({k<m}). Then we analyze the asymptotic relation between these two probabilistic laws when the difference {m-k} goes to infinity. New insights which qualify the relative accuracy in the case of high order finite elements are also obtained.

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