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Selected Papers from the 5th International Conference on "Structural Analysis of Advanced Materials”

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Materials Characterization".

Deadline for manuscript submissions: closed (30 September 2013) | Viewed by 36402

Special Issue Editor

Composite Materials Group (CMG), Department of Mechanical and Aeronautics Engineering, University of Patras, GR-26500 Patras, Greece
Interests: polymer physics and engineering; mechanics of micro- and nano-composite materials; sandwich structures; micromechanical modelling; linear and non-linear viscoelastic behavior; thermal analysis; dynamic-mechanical analysis; impact behavior; environmental effects-fracture mechanics; adhesion; interfaces and interphases
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Special Issue Information

Dear Colleagues,

Special issue information can be found at http://icsaam2013.upatras.gr/.

Prof. Dr. George Papanicolaou
Guest Editor

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Published Papers (5 papers)

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1162 KiB  
Communication
Optical Fiber Embedded in Epoxy Glass Unidirectional Fiber Composite System
by Irina Severin, Rochdi El Abdi, Guillaume Corvec and Mihai Caramihai
Materials 2014, 7(1), 44-57; https://doi.org/10.3390/ma7010044 - 20 Dec 2013
Cited by 6 | Viewed by 8332
Abstract
We aimed to embed silica optical fibers in composites (epoxy vinyl ester matrix reinforced with E-glass unidirectional fibers in mass fraction of 60%) in order to further monitor the robustness of civil engineering structures (such as bridges). A simple system was implemented using [...] Read more.
We aimed to embed silica optical fibers in composites (epoxy vinyl ester matrix reinforced with E-glass unidirectional fibers in mass fraction of 60%) in order to further monitor the robustness of civil engineering structures (such as bridges). A simple system was implemented using two different silica optical fibers (F1—double coating of 172 µm diameter and F2—single coating of 101.8 µm diameter respectively). The optical fibers were dynamically tensile tested and Weibull plots were traced. Interfacial adhesion stress was determined using pull-out test and stress values were correlated to fracture mechanisms based on SEM observations. In the case of the optical fiber (OF) (F1)/resin system and OF (F1)/composite system, poor adhesion was reported that may be correlated to interface fracture at silica core level. Relevant applicable results were determined for OF (F2)/composite system. Full article
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816 KiB  
Article
Ferromagnetic Objects Magnetovision Detection System
by Michał Nowicki and Roman Szewczyk
Materials 2013, 6(12), 5593-5601; https://doi.org/10.3390/ma6125593 - 02 Dec 2013
Cited by 16 | Viewed by 6288
Abstract
This paper presents the application of a weak magnetic fields magnetovision scanning system for detection of dangerous ferromagnetic objects. A measurement system was developed and built to study the magnetic field vector distributions. The measurements of the Earth’s field distortions caused by various [...] Read more.
This paper presents the application of a weak magnetic fields magnetovision scanning system for detection of dangerous ferromagnetic objects. A measurement system was developed and built to study the magnetic field vector distributions. The measurements of the Earth’s field distortions caused by various ferromagnetic objects were carried out. The ability for passive detection of hidden or buried dangerous objects and the determination of their location was demonstrated. Full article
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1166 KiB  
Article
Influence of Experimental Parameters on Fatigue Crack Growth and Heat Build-Up in Rubber
by Franziska Stadlbauer, Thomas Koch, Vasiliki-Maria Archodoulaki, Florian Planitzer, Wolfgang Fidi and Armin Holzner
Materials 2013, 6(12), 5502-5516; https://doi.org/10.3390/ma6125502 - 27 Nov 2013
Cited by 18 | Viewed by 5148
Abstract
Loading parameters (frequency, amplitude ratio and waveform) are varied to determine their influence on fatigue crack growth in rubber. Up to three different rubber blends are investigated: one actual engineering material and two model materials. Fatigue crack growth curves and strain distributions of [...] Read more.
Loading parameters (frequency, amplitude ratio and waveform) are varied to determine their influence on fatigue crack growth in rubber. Up to three different rubber blends are investigated: one actual engineering material and two model materials. Fatigue crack growth curves and strain distributions of pure shear and faint waist pure shear samples are compared for a model material. Fatigue behavior is studied for three different frequencies (1 Hz, 3 Hz and 5 Hz). Amplitude ratio appears to be another important influence factor concerning fatigue crack growth in rubber. The beneficial effect of positive amplitude ratios (tensional loading conditions) is shown for different materials. However, fatigue crack growth is considerably increased for negative amplitude ratios (tensional-compressional loading conditions). Furthermore, the influence of the waveform is determined for three different waveform shapes. One is sinusoidal, and two have a square shape, including dwell periods and sinusoidal slopes. Special focus lies on heat build-up, which is substantial, especially for large loads, high frequencies and/or highly filled rubber blends. Plateau temperatures are determined for various loading conditions and rubber blends. A very simple linear relationship with dissipated energy per time and unit area is obtained. Results gathered with dynamic mechanical analyses show, likewise, a linear trend, but the heat build-up is very small, due to different sample geometries. Full article
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912 KiB  
Article
Developing a Sealing Material: Effect of Epoxy Modification on Specific Physical and Mechanical Properties
by Christoph Schoberleitner, Vasiliki-Maria Archodoulaki, Thomas Koch, Sigrid Lüftl, Markus Werderitsch and Gerhard Kuschnig
Materials 2013, 6(12), 5490-5501; https://doi.org/10.3390/ma6125490 - 27 Nov 2013
Cited by 10 | Viewed by 5251
Abstract
To develop a matched sealing material for socket rehabilitation of grey cast iron pipes, an epoxy resin is modified by the addition of different components to improve the flexibility. Three different modifications are made by adding ethylene-propylene diene monomer (EPDM) rubber powder, reactive [...] Read more.
To develop a matched sealing material for socket rehabilitation of grey cast iron pipes, an epoxy resin is modified by the addition of different components to improve the flexibility. Three different modifications are made by adding ethylene-propylene diene monomer (EPDM) rubber powder, reactive liquid polymer (ATBN) and epoxidized modifier. In this paper the effect of the modification method as well as the influence of absorption of water on the mechanical and physical properties are analyzed in terms of: tensile strength, modulus of elasticity, adhesion performance, pressure resistance, glass transition temperature and water content. A comparison with neat epoxy shows for all materials that the modulus of elasticity and strength decrease. Unlike other tested modification methods, the modification with rubber powder did not enhance the flexibility. All materials absorb water and a plasticization effect arises with further changes of mechanical and physical properties. The application of the sealant on the grey cast iron leads to a reduction of the strain at break (in comparison to the common tensile test of the pure materials) and has to be evaluated. The main requirement of pressure resistance up to 1 MPa was tested on two chosen materials. Both materials fulfill this requirement. Full article
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1156 KiB  
Concept Paper
Non-Destructive Thermography Analysis of Impact Damage on Large-Scale CFRP Automotive Parts
by Alexander Maier, Roland Schmidt, Beate Oswald-Tranta and Ralf Schledjewski
Materials 2014, 7(1), 413-429; https://doi.org/10.3390/ma7010413 - 14 Jan 2014
Cited by 57 | Viewed by 10711
Abstract
Laminated composites are increasingly used in aeronautics and the wind energy industry, as well as in the automotive industry. In these applications, the construction and processing need to fulfill the highest requirements regarding weight and mechanical properties. Environmental issues, like fuel consumption and [...] Read more.
Laminated composites are increasingly used in aeronautics and the wind energy industry, as well as in the automotive industry. In these applications, the construction and processing need to fulfill the highest requirements regarding weight and mechanical properties. Environmental issues, like fuel consumption and CO2-footprint, set new challenges in producing lightweight parts that meet the highly monitored standards for these branches. In the automotive industry, one main aspect of construction is the impact behavior of structural parts. To verify the quality of parts made from composite materials with little effort, cost and time, non-destructive test methods are increasingly used. A highly recommended non-destructive testing method is thermography analysis. In this work, a prototype for a car’s base plate was produced by using vacuum infusion. For research work, testing specimens were produced with the same multi-layer build up as the prototypes. These specimens were charged with defined loads in impact tests to simulate the effect of stone chips. Afterwards, the impacted specimens were investigated with thermography analysis. The research results in that work will help to understand the possible fields of application and the usage of thermography analysis as the first quick and economic failure detection method for automotive parts. Full article
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