Historical Review on the Linear and Nonlinear Damped Structural Behavior of Composite Structures

2013 ◽  
pp. 9-24
Author(s):  
Dimitrios I. Chortis
Keyword(s):  
Composite Structures ◽  
Historical Review ◽  
Structural Behavior ◽  
Linear And Nonlinear

Experimental Study and Analysis of the Structural Behavior of Steel-Concrete Composite Beam after Shear Connector Corrosion

2014 ◽  
Vol 578-579 ◽  
pp. 1522-1530
Author(s):  
Ya Chuan Kuang ◽  
Jin Ren Feng ◽  
Zhi Wu Yu ◽  
Xiao Jie Liu
Keyword(s):  
Composite Beam ◽  
Composite Structures ◽  
Shear Capacity ◽  
Experimental Results ◽  
Structural Behavior ◽  
Conduction Time ◽  
Shear Connector ◽  
Flexural Capacity ◽  
Bond Slip ◽  
Stud Shear Connector

Stud shear connector corrosion is an important factor for the durability degradation of steel-concrete composite structures. Stud shear connector corrosion in the natural environment is a slow process, so the shear capacity of deteriorated stud shear connector was studied by accelerate d deterioration using a galvanstatic method in this paper. Then, bending tests were conducted to study the structural behavior of steel-concrete composite beam after stud shear connector corrosion. Experimental results show that with the increase of conduction time, the corrosion rate of stud increases, the shear capacity of stud as well as the flexural capacity of steel-concrete composite beam decreases and the relative bond-slip between steel beam and concrete increases when loading. By the regression analysis of experimental results, formula was proposed to predict the shear capacity of studs after corrosion and the flexural capacity of deteriorated steel-concrete composite beam.

Structural behavior of co-bonded composite structures subject to mode I and mode II fatigue induced delamination.

2017 ◽  
Author(s):  
Felipe Garpelli ◽  
Francis Gonzalez ◽  
Núbia Nale Silveira ◽  
Mariano Arbelo ◽  
Mauricio Donadon ◽  
...  
Keyword(s):  
Composite Structures ◽  
Structural Behavior ◽  
Mode I ◽  
Mode Ii ◽  
Bonded Composite

Damage Detection in Composite Structures via Scanning Laser Doppler Vibrometry Using Linear and Nonlinear Ultrasonic Wave Features

2020 ◽  
Author(s):  
Mingjing Cen ◽  
Yanfeng Shen
Keyword(s):  
Damage Detection ◽  
Composite Structures ◽  
Structural Damage ◽  
Numerical Study ◽  
Fiber Composite ◽  
Tone Burst ◽  
Nonlinear Ultrasonic ◽  
Nonlinear Features ◽  
Linear And Nonlinear ◽  
Delamination Area

Abstract This study presents the modeling and experimental investigation of damage detection and evaluation methods based on the linear and nonlinear features of ultrasonic guided waves while they interact with possible structural damage sites. Such wave damage interaction features are visualized via the full field imaging capability of SLDV. First, numerical modeling is conducted to develop an in-depth understanding of the mechanism behind the wave damage interactions. A coupled-filed transient dynamic finite element model is constructed with a simulated delamination area. The modeling of Contact Acoustic Nonlinearity (CAN) is realized by defining the contact surfaces at the delamination area. The linear ultrasonic features such as the trapped modes as well as the nonlinear features such as the mixed frequency response are illustrated using the numerical simulation. Based on the numerical study, experimental investigations are further conducted. Experiments are performed to explore linear ultrasonic technique for damage quantification. For the linear case, the detection utilizes a short tone burst in both spatial and temporal domain, generated by a Piezoelectric Wafer Active Sensor (PWAS); the trapped wave energy and a directional vector field technique are adopted to visualize an impact damage in a carbon fiber composite plate. The nonlinear detection methodology combines a continuous resonant low frequency harmonic pumping wave with a high frequency tone burst probing wave, simultaneously generated by two PWAS transducers on both sides of the specimen to take advantage of the mixed nonlinear interactions between the vibroacoustic waves and the structural damage. This study shows that both linear and nonlinear ultrasonic techniques possess great application potential for the damage detection and quantification in composite structures. The paper finishes with summary, concluding remarks, and suggestions for future work.

scholarly journals Modeling of Mechanical Properties of the Polymeric Composite Reinforced with Braided Preform

2021 ◽  
Vol 1199 (1) ◽  
pp. 012007
Author(s):  
A Kondratiev ◽  
O Andrieiev ◽  
A Tsaritsynskyi ◽  
T Nabokina
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
High Speed ◽  
Experimental Studies ◽  
Polymeric Composite ◽  
Structural Behavior ◽  
Elastic Behavior ◽  
Design Parameters ◽  
Polymeric Composite Materials ◽  
Reinforcement Angle

Abstract Braided composite structures based on preforms are widely used in various industries. Owing to use of such preforms high speed and efficiency of the process of manufacturing of polymeric composite materials and structures on their basis can be provided. Knowledge of their properties in the design allows optimizing the production of structures with the specified parameters. The paper gives the review of three approaches to the description of physical and mechanical characteristics of the composite with braided fixtures – based on the classical theory of layered media, rod-based model, and the method of polynomial approximation. The necessary estimated dependencies were derived in order to predict the elastic and structural behavior of the composites under study at any reinforcement angle according to the known characteristics of predetermined angles. Synthesized design parameters, as distinct from the existing ones, allow predicting strength characteristics of the composite based on the braided hoses depending on the positioning and location of the material on the shape-generating surface. For the verification of theoretical results, a number of experimental studies have been carried out with the formation of samples of the material with the different reinforcing angles. Comparison of the analytical and experimental results allows drawing the conclusions that rod-based model gives the best results for the description of elastic behavior of the polymeric composite materials, whereas the obtained polynomial dependences are recommended for the structural behavior. The results of the work represent the basis for solving the problems of calculation of strength of the structures made of composite materials based on the braided preforms

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