Creep Responses of Smart Sandwich Composites at Multiple Length Scales: Experiments and ModelingSource: Journal of Engineering Materials and Technology:;2011:;volume( 133 ):;issue: 001::page 11008Author:Anaïs Farrugia
,
Charles Winkelmann
,
Jeong Sik Kim
,
Anastasia H. Muliana
,
Valeria La Saponara
DOI: 10.1115/1.4002643Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In service, composite structures present the unique challenge of damage detection and repair. Piezoelectric ceramic, such as lead zirconate titanate (PZT), is often used for detecting damage in composites. This paper investigates the effect of embedded PZT crystals on the overall creep behavior of sandwich beams comprising of glass fiber reinforced polymer laminated skins and polymer foam core, which could potentially be used as a damage-detecting smart structure. Uniaxial quasi-static and creep tests were performed on the glass/epoxy laminated composites having several fiber orientations, 0 deg, 45 deg, and 90 deg, to calibrate the elastic and viscoelastic properties of the fibers and matrix. Three-point bending creep tests at elevated temperature (80°C) were then carried out for a number of control sandwich beams (no PZT crystal) and conditioned sandwich beams (with PZT crystals embedded in the center of one facesheet). Lateral deflection of the sandwich beams was monitored for more than 60 h. The model presented in this paper is composed by two parts: (a) a simplified micromechanical model of unidirectional fiber reinforced composites used to obtain effective properties and overall creep response of the laminated skins and (b) a finite element method to simulate the overall creep behavior of the sandwich beams with embedded PZT crystals. The simplified micromechanical model is implemented in the material integration points within the laminated skin elements. Fibers are modeled as linear elastic, while a linearized viscoelastic material model is used for the epoxy matrix and foam core. Numerical results on the creep deflection of the smart sandwich beams show good correlations with the experimental creep deflection at 80°C, thus proving that this model, although currently based on material properties reported at room temperature, is promising to obtain a reasonable prediction for the creep of a smart sandwich structure at high temperatures.
keyword(s): Creep , Temperature , Composite materials , Modeling , Fibers , Glass reinforced plastics AND Epoxy adhesives ,
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contributor author | Anaïs Farrugia | |
contributor author | Charles Winkelmann | |
contributor author | Jeong Sik Kim | |
contributor author | Anastasia H. Muliana | |
contributor author | Valeria La Saponara | |
date accessioned | 2017-05-09T00:44:03Z | |
date available | 2017-05-09T00:44:03Z | |
date copyright | January, 2011 | |
date issued | 2011 | |
identifier issn | 0094-4289 | |
identifier other | JEMTA8-27135#011008_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/146206 | |
description abstract | In service, composite structures present the unique challenge of damage detection and repair. Piezoelectric ceramic, such as lead zirconate titanate (PZT), is often used for detecting damage in composites. This paper investigates the effect of embedded PZT crystals on the overall creep behavior of sandwich beams comprising of glass fiber reinforced polymer laminated skins and polymer foam core, which could potentially be used as a damage-detecting smart structure. Uniaxial quasi-static and creep tests were performed on the glass/epoxy laminated composites having several fiber orientations, 0 deg, 45 deg, and 90 deg, to calibrate the elastic and viscoelastic properties of the fibers and matrix. Three-point bending creep tests at elevated temperature (80°C) were then carried out for a number of control sandwich beams (no PZT crystal) and conditioned sandwich beams (with PZT crystals embedded in the center of one facesheet). Lateral deflection of the sandwich beams was monitored for more than 60 h. The model presented in this paper is composed by two parts: (a) a simplified micromechanical model of unidirectional fiber reinforced composites used to obtain effective properties and overall creep response of the laminated skins and (b) a finite element method to simulate the overall creep behavior of the sandwich beams with embedded PZT crystals. The simplified micromechanical model is implemented in the material integration points within the laminated skin elements. Fibers are modeled as linear elastic, while a linearized viscoelastic material model is used for the epoxy matrix and foam core. Numerical results on the creep deflection of the smart sandwich beams show good correlations with the experimental creep deflection at 80°C, thus proving that this model, although currently based on material properties reported at room temperature, is promising to obtain a reasonable prediction for the creep of a smart sandwich structure at high temperatures. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Creep Responses of Smart Sandwich Composites at Multiple Length Scales: Experiments and Modeling | |
type | Journal Paper | |
journal volume | 133 | |
journal issue | 1 | |
journal title | Journal of Engineering Materials and Technology | |
identifier doi | 10.1115/1.4002643 | |
journal fristpage | 11008 | |
identifier eissn | 1528-8889 | |
keywords | Creep | |
keywords | Temperature | |
keywords | Composite materials | |
keywords | Modeling | |
keywords | Fibers | |
keywords | Glass reinforced plastics AND Epoxy adhesives | |
tree | Journal of Engineering Materials and Technology:;2011:;volume( 133 ):;issue: 001 | |
contenttype | Fulltext |