Decomposed Multilevel Optimization of a Nano-Enhanced Sandwich Composite Plate under Epistemic Uncertainty

2017 ◽  
Author(s):  
Ian D. Dettwiller ◽  
Masoud Rais-Rohani
Keyword(s):  
Composite Plate ◽  
Epistemic Uncertainty ◽  
Sandwich Composite ◽  
Multilevel Optimization

The Effect of Reinforcement Structure on the Modal Parameters for Sandwich Structure Composite Plate

2011 ◽  
Vol 194-196 ◽  
pp. 2420-2424
Author(s):  
Guo Li Zhang ◽  
Ya Nan Wang ◽  
Jia Lu Li ◽  
Guang Wei Chen ◽  
Li Chen ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Composite Plate ◽  
High Speed ◽  
Sandwich Structure ◽  
Flexural Vibration ◽  
Sandwich Composite ◽  
Reciprocating Motion ◽  
Modal Shape ◽  
Reinforcement Structure ◽  
Plate Specimen

In order to investigate the effect of different reinforcement structure on the dynamic characteristics of sandwich structure composite plates used for manufacturing the high speed reciprocating motion composite components, four kinds of paulownia wood sandwich composite test specimens with dimensions of 350×83.5×9.5mm was designed and made by hand lay-up performing and press molding technology. The woven and 2D braiding fabric prepreg were both selected as top face and inner face materials , respectively, and the carbon fiber woven fabric prepreg was chosen as inner part materials. According to the impulse response modal test method, a modal test system was established. It was found that this kind of sandwich structure composite plate has bigger natural frequency value, it’s minimum natural frequency was about 609.77Hz that could meet the requirement for high speed reciprocating motion parts. The dynamic test results shown that the natural frequency of F2BAF-IUC-CPW sample is higher t about 11.17% at least, selecting 2D integral braiding pipe fabric as top face and inner face reinforced materials could effectively improve the dynamic properties of sandwich composite rectangular plates. The modal experiments indicated that the modal shapes of sandwich composite plate specimen with four kind reinforcement structures were identical, it’s 1st modal shape, 2nd modal shape and 3rd modal shape presented torsional vibration shape, flexural vibration shape and torsional flexural vibration shape, separately, the modal shapes of sandwich composite plate specimen were not obviously affected by reinforcement structure.

Punching shear behavior of steel–concrete–steel sandwich composite plate under patch loads

2016 ◽  
Vol 121 ◽  
pp. 50-64 ◽  
Author(s):  
Jia-Bao Yan ◽  
Jun-Yan Wang ◽  
J.Y. Richard Liew ◽  
Xudong Qian ◽  
Zhong-Xian Li
Keyword(s):  
Composite Plate ◽  
Shear Behavior ◽  
Punching Shear ◽  
Sandwich Composite

scholarly journals Free Vibration Analysis of Functionally Gradient Sandwich Composite Plate Embedded SMA Wires in Surface Layer

2020 ◽  
Vol 10 (11) ◽  
pp. 3921
Author(s):  
Yizhe Huang ◽  
Lin Li ◽  
Zhichao Xu ◽  
Chaopeng Li ◽  
Kuanmin Mao
Keyword(s):  
Surface Layer ◽  
Dynamic Behavior ◽  
Composite Plate ◽  
Sandwich Plate ◽  
Volume Fraction ◽  
Core Layer ◽  
Sandwich Composite ◽  
Composition Gradient ◽  
Gradient Distribution ◽  
The Core

In this paper, a new type of composite gradient sandwich plate structure is proposed, which embeds the pre-strained shape memory alloy (SMA) into the surface layer and the core layer composed of epoxy resin and graphite-reinforced materials. In the core layer, graphite-reinforced material has a continuous gradient distribution along the thickness direction of the sandwich plate. Dynamic behavior of composite gradient sandwich plate in thermal environment is investigated. The equations of motion and frequency equation are derived based on the Reddy shear deformation theory and the constitutive equation for a composite sandwich plate, via the Hamilton principle. Some analytical study is depicted to provide an insight into the effects of volume fraction of material composition, gradient distribution of graphite in the core layer, and pre-strain of SMA in the surface layer on the dynamic behavior of a sandwich composite plate. This study investigates the modal performance of a sandwich composite plate with two aspects, a gradient core layer of graphite-reinforced material and surface layer-embedded SMA wires, which provide a new design idea for dynamic behavior of sandwich plates.

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