<abstract xmlns="http://www.w3.org/1999/xhtml"> Dynamic mechanic (DMA) tests were performed to compare the mechanical behaviour of glass fibre reinforced epoxy laminate composites with SiO2 nanoparticle reinforced matrix. The selection of the most promising nanoparticle concentrations was considered in terms of elastic modulus and glass transition temperature. The reference specimens (0% nanoparticles) did not contain diluent accordingly the results do not allow the exact comparison with unreinforced composite, nevertheless the ranking of the nanocomposites was made. In terms of stiffness requirements 20% nanoparticles composites offer the best behaviour, 25% higher elastic modulus than 5% nanoparticles. For nano composites the glass transition temperature TG is the highest: 80°C, 77°C for 3%, 5% nanoparticles respectively and the lowest 75°C, 72°C , 71°C for 15%, 10% and 20% nanoparticles is respectively .</abstract>

Gdańsk University of Technology, Mechanical Faculty, 80-233 Gdańsk Narutowicza 11/12 Gdańsk, Poland

Aarhus University, Department of Engineering, 8200 Aarhus C, Dalgas Avenue 2, Denmark

DYNAMIC MECHANICAL BEHAVIOUR OF GFRP COMPOSITES WITH SiO2 NANO PARTICLES REINFORCED EPOXY MATRIX

<abstract xmlns="http://www.w3.org/1999/xhtml"> The purpose of the present paper is to demonstrate how a thermodynamic method can be used for solving a problem of the decarburisation of bainite laths and carbon diffusion distances in the matrix of ADI. This should in principle enable to examine the partitioning of carbon from supersaturated ferrite laths into adjacent austenite and the carbon content in retained austenite using analytical method. The paper presents an investigation of the time required for the diffusion of carbon out of supersaturated laths of ferrite into the retained austenite. A consequence of the precipitation of cementite from austenite during austempering is that the growth of bainitic ferrite can continue to larger extent and that the resulting microstructure is not an ausferrite but it is a mixture of bainitic ferrite, retained austenite and carbides. In case of this microstructure the product of austempering reaction in ductile iron is rather bainite than “ausferrite”.</abstract>

AUSFERRITIC OR BAINITIC TRANSFORMATION IN ADI

<abstract xmlns="http://www.w3.org/1999/xhtml"> This study presents the test results of Ti-20Nb-15Al alloy isothermal oxidation in air at 700°C with the consideration of the effect of annealing time on the condition of the surface layer. It was determined that, depending on the heating time, the surface of the tested alloy was characterized by a different colouring. This phenomenon was observed only at 700°C.</abstract>

THE ANALYSIS OF THE EFFECT OF TIME AND TEMPERATURE OF AIR ON THE COLOURING OF THE SURFACE LAYER OF O-Ti2AlNb BASED TITANIUM ALLOY

<abstract xmlns="http://www.w3.org/1999/xhtml"> The R6 procedure is one of the most advanced, innovative and effective method developed and recommended for use in problems of material behaviour and structural integrity of engineering structures with defects. The idea and basic assumptions of R6 procedure are described in the paper as well as example of its practical application in analysis of damaged bridge structural element. As a result of the research, the highly conservative approach of R6 procedure was observed, which estimated the level of hazardous loads as the elastic limit load for analysed element.</abstract>

ASSESSMENT OF MATERIAL BEHAVIOUR AND STRUCTURAL INTEGRITY OF ENGINEERING STRUCTURES BASED ON R6 PROCEDURE

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Volume 13 (2013): Issue 4 (December 2013)

DYNAMIC MECHANICAL BEHAVIOUR OF GFRP COMPOSITES WITH SiO₂ NANO PARTICLES REINFORCED EPOXY MATRIX

AUSFERRITIC OR BAINITIC TRANSFORMATION IN ADI

THE ANALYSIS OF THE EFFECT OF TIME AND TEMPERATURE OF AIR ON THE COLOURING OF THE SURFACE LAYER OF O-Ti2AlNb BASED TITANIUM ALLOY

ASSESSMENT OF MATERIAL BEHAVIOUR AND STRUCTURAL INTEGRITY OF ENGINEERING STRUCTURES BASED ON R6 PROCEDURE

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