Nondestructive analysis of core-junction and joint-debond effects in advanced composite structure

2019 ◽  
Vol 73 ◽  
pp. 31-38 ◽  
Author(s):  
Shirsendu Sikdar ◽  
Wiesław Ostachowicz
Keyword(s):  
Composite Structure ◽  
Nondestructive Analysis ◽  
Advanced Composite ◽  
Core Junction

scholarly journals The development of an advanced composite structure using evolutionary design methods

2009 ◽  
Author(s):  
◽  
David Van Wyk
Keyword(s):  
Composite Materials ◽  
Composite Structure ◽  
Composite Structures ◽  
Empirical Method ◽  
Optimum Shape ◽  
Evolutionary Design ◽  
Structural Optimisation ◽  
Design For Manufacture ◽  
Advanced Composite ◽  
Evolutionary Optimisation

The development of an evolutionary optimisation method and its application to the design of an advanced composite structure is discussed in this study. Composite materials are increasingly being used in various fields, and so optimisation of such structures would be advantageous. From among the various methods available, one particular method, known as Evolutionary Structural Optimisation (ESO), is shown here. ESO is an empirical method, based on the concept of removing and adding material from a structure, in order to create an optimum shape. The objective of the research is to create an ESO method, utilising MSC.Patran/Nastran, to optimise composite structures. The creation of the ESO algorithm is shown, and the results of the development of the ESO algorithm are presented. A tailfin of an aircraft was used as an application example. The aim was to reduce weight and create an optimised design for manufacture. The criterion for the analyses undertaken was stress based. Two models of the tailfin are used to demonstrate the effectiveness of the developed ESO algorithm. The results of this research are presented in the study.

scholarly journals Nondestructive Analysis of Debonds in a Composite Structure under Variable Temperature Conditions

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3454 ◽  
Author(s):  
Shirsendu Sikdar ◽  
Abhishek Kundu ◽  
Michał Jurek ◽  
Wiesław Ostachowicz
Keyword(s):  
Wave Propagation ◽  
Ambient Temperature ◽  
Composite Structure ◽  
Composite Structures ◽  
Variable Temperature ◽  
Guided Wave ◽  
Monitoring Strategy ◽  
Nondestructive Analysis ◽  
Adhesively Bonded ◽  
Temperature Conditions

This paper presents a nondestructive analysis of debonds in an adhesively-bonded carbon-fibre reinforced composite structure under variable temperature conditions. Towards this, ultrasonic guided wave propagation based experimental analysis and numerical simulations are carried out for a sample composite structure to investigate the wave propagation characteristics and detect debonds under variable operating temperature conditions. The analysis revealed that the presence of debonds in the structure significantly reduces the wave mode amplitudes, and this effect further increases with the increase in ambient temperature and debond size. Based on the debond induced differential amplitude phenomenon, an online monitoring strategy is proposed that directly uses the guided wave signals from the distributed piezoelectric sensor network to localize the hidden debonds in the structure. Debond index maps generated from the proposed monitoring strategy show the debond identification potential in the adhesively-bonded composite structure. The accuracy of the monitoring strategy is successfully verified with non-contact active infrared-thermography analysis results. The effectiveness of the proposed monitoring strategy is further investigated for the variable debond size and ambient temperature conditions. The study establishes the potential for using the proposed damage index constructed from the differential guided wave signal features as a basis for localization and characterization of debond damages in operational composite structures.

Precision Placement Analysis of a New Multi-DOF Piezoelectric End-Effector via Finite Elements

1997 ◽  
Author(s):  
Hassan Bahrami ◽  
H. S. Tzou
Keyword(s):  
Composite Structure ◽  
Piezoelectric Materials ◽  
Active Vibration Control ◽  
Piezoelectric Composite ◽  
Sensors And Actuators ◽  
End Effector ◽  
Advanced Composite ◽  
Piezoelectric Effects ◽  
Active Vibration ◽  
Converse Piezoelectric Effect

Abstract Piezoelectric materials are increasingly being applied to various fieldS of research and engineering applications. In recent years for example, much work has been concentrated on active vibration control of structures by incorporating piezoelectric as both sensorS and actuators. In the industry, piezoelectrics are widely being accepted as effective sensors, giving engineers more leverage to add new features to their products. In this paper, piezoelectric composite structure is studied for precision placement of a multiple degrees off freedom (DOF) end–effector per the converse piezoelectric effect. This new design of the multi–DOF cantilever beam, by attaching multiple piezoelectric rectangular rods together, will provide a way to accurately position the end of this beam structure. The computation of this advanced composite structure is done by the finite element method incorporating the piezoelectric effects.

scholarly journals Advanced composite structure combining Ultra high performance concrete with normal reinforced concrete

2019 ◽  
Vol 278 ◽  
pp. 03004
Author(s):  
Xiangguo Wu
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Composite Structure ◽  
Composite Structures ◽  
High Performance ◽  
High Performance Concrete ◽  
Raw Materials ◽  
Constitutive Relations ◽  
Ultra High Performance Concrete ◽  
Advanced Composite

Ultra high performance concrete (UHPC), one of the newest cementitious composites, demonstrates superior ductility with high strength and durability, which has gained the attention of researchers and engineers since it was successfully developed. Considering its superior ductility and durability, UHPC is a good alternative material for forming a advanced composite structure with normal reinforced concrete (RC) or prestressed concrete. The material properties are critical for its application in composite structures, so in this chapter, material properties of UHPC, such as constitute raw materials, mechanical properties, durability and several constitutive relations from several standards are firstly introduced. The basic concepts of advanced UHPC-RC composite structures, such as UHPC-RC composite beam, composite column, composite wall, etc, are introduced finally.

Advanced Composite Structure Repair Guide

1981 ◽  
Vol 18 (9) ◽  
pp. 766-769
Author(s):  
C. E. Beck
Keyword(s):  
Composite Structure ◽  
Advanced Composite
Sign in / Sign up

Export Citation Format

Share Document