Dynamic behavior of composite structures with composite connections

2021 ◽  
pp. 255-263
Author(s):  
L. Simões da Silva ◽  
P.J.S. Cruz ◽  
L. Calado
Keyword(s):  
Dynamic Behavior ◽  
Composite Structures ◽  
Composite Connections

The Biot Model and Its Application in Viscoelastic Composite Structures

2007 ◽  
Vol 129 (5) ◽  
pp. 533-540 ◽  
Author(s):  
J. Zhang ◽  
G. T. Zheng
Keyword(s):  
Mathematical Model ◽  
Dynamic Behavior ◽  
Composite Structures ◽  
Optimization Method ◽  
Noise Attenuation ◽  
Viscoelastic Materials ◽  
Numerical Techniques ◽  
Viscoelastic Composite ◽  
Biot Model ◽  
Numerical Examples

Application of viscoelastic materials in vibration and noise attenuation of complicated machines and structures is becoming more and more popular. As a result, analytical and numerical techniques for viscoelastic composite structures have received a great deal of attention among researchers in recent years. Development of a mathematical model that can accurately describe the dynamic behavior of viscoelastic materials is an important topic of the research. This paper investigates the procedure of applying the Biot model to describe the dynamic behavior of viscoelastic materials. As a minioscillator model, the Biot model not only possesses the capability of its counterpart, the GHM (Golla-Hughes-McTavish) model, but also has a simpler form. Furthermore, by removing zero eigenvalues, the Biot model can provide a smaller-scale mathematical model than the GHM model. This procedure of dimension reduction is studied in detail here. An optimization method for determining the parameters of the Biot model is also investigated. With numerical examples, these merits, the computational efficiency, and the accuracy of the Biot model are illustrated and proved.

Mechanical Performance of Connections for GluBam-Concrete Composite Beams

2016 ◽  
Vol 847 ◽  
pp. 521-528
Author(s):  
Bo Shan ◽  
Yan Xiao ◽  
Wei Liang Zhang ◽  
Bo Liu
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Composite Beams ◽  
Test Results ◽  
Relative Slip ◽  
Direct Shear Tests ◽  
Initial Stage ◽  
Strength And Stiffness ◽  
Composite Connections

Selecting composite connections is a crucial factor for researching mechanical performance of GluBam-concrete composite structure (BCC). An initial stage of research on the feasibility of GluBam-concrete composite beams is described. Total three types of composite connector, six specimens in each type, have been conducted direct shear tests on small blocks. The shear-relative slip curves were measured and all the relevant mechanical properties such as slip moduli and shear capacities were calculated. According to the test results, all connectors can be classified into two types, which owned strong and stiff mechanical properties but low ductility, or less strength and stiffness but high ductility. The BCC systems presented own characteristics compared with the outcomes obtained from the TCC system. It was founded that some of connection systems were suitable for constructed GluBam-concrete composite structures. However only qualitative conclusions can be drawn at this stage and the performance of GluBam-concrete composite beams need to be investigated further.

scholarly journals Coupling Dynamic Behavior Characteristics of a Spacecraft Beam with Composite Laminated Structures and Large-Scale Motions

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Bindi You ◽  
Zhihui Gao ◽  
Jianmin Wen ◽  
Yiming Sun ◽  
Peibo Hao ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Nonlinear Dynamic ◽  
Composite Beam ◽  
Composite Structures ◽  
Laminated Composite ◽  
Engineering Practice ◽  
Laminated Beam ◽  
Large Rotation ◽  
Laminated Composite Beam ◽  
Laminated Structures

A nonlinear dynamic modeling method for a spacecraft body composed of a laminated composite beam undergoing large rotation is proposed in this paper. To study the characteristics of a laminated composite beam attached to a spacecraft body for the dynamic systems, the deformation description of a laminated beam is established with the consideration of laying angles and laying layers, and the displacement-strain relations is acquired based on the global-local higher-order shear deformation theory. Accordingly, a nonlinear dynamic model of the spacecraft body composed of a laminated composite beam is deduced using Hamilton variational principle. And the complete coupling terms for the laminated material properties are considered unlike any other singular or unidirectional materials. Then, the dynamic behavior of the spacecraft system is analyzed by comparison of an orthogonal-symmetric, singular, and unidirectional laminated beam. The results show that the laminated composite structures have significant influences on the dynamics properties of spacecraft compared with conventional equivalent singular or unidirectional materials. Hence, the nonlinear model is well suitable for approaching the problem of coupling relationship between geometric nonlinearity and large rotation motions. These conclusions will have significant theory and engineering practice values for coupling dynamics properties of laminated beams.

Protected Steel and Composite Connections

2015 ◽  
Vol 6 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Peter Schaumann ◽  
Thomas Kirsch
Keyword(s):  
Composite Structures ◽  
Numerical Models ◽  
Steel Structure ◽  
Structural Behaviour ◽  
Main Requirement ◽  
Fe Simulations ◽  
Plate Connections ◽  
Composite Connections ◽  
Plate Connection ◽  
In Fire

Actual developments in numerical simulations of the structural behaviour in fire situation are focussed on taking into consideration the interaction of all structural members in a global approach. Therefore it is necessary to simulate the load bearing behaviour of connections. With this motivation, the authors conducted experiments and thermal FE-simulations on two different connection types. In this paper, the accompanying mechanical FE-simulations of both investigated connection types will be described. The joints are defined as an end plate connection in a steel structure and a fin plate connection in a composite structure. Besides the validation of the numerical models, the results of the described investigations show that it is possible to activate a significant moment resistance within fin plate connections of composite structures. The main requirement for this activation is sufficient reinforcement strength.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

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