Matiašová, J.

Ružiak, Ivan

Valášek, Rudolf

English

DSpace at VSB Technical University of Ostrava

l I I I� L. I 'Sborník vědeckých prací Vysoké školy báňské-Technické univerzity Ostrava číslo 1, rok 2009, ročník LII, řada hutnická článek č. 1424 MECHANICAL PROPERTIES OF ARAMID-EPOXY LAMINATES R..VALÁŠEK1', J. RUŽIAK.2, J. MATIAŠOVN 1* Faculty o/ lndustrial Technologies, Department o/ Physical Engineering o/ Materials, Alexander DubčekUniversity o/ Trentin; Púchov, Slovak Republic, valaseli@fpt.tnunLsk2 Faculty o/ lndustrial Technologies, Institute o/ Materials and Technological Research, Alexander DubtekUniversity o/ Trentin; Púchov, Slovak Republic, ruziak@fpt.tnunLsk ABSTRACT: Mechanical properties of materials play an important role in material safety conditions. Laminates are materials which are more and more used in different applications year by year. Their extraordinary properties include high mechanical properties, resistivity against fire and other. Young 's modulus of elasticity E, yield stress Rp, tensile strength Rm and ductility A also belong to these mechanical properties. Very important characteristic of materials is stress-strain curve which describes material behavior in process of mechanical loading. In the work, we are dealing with stress-strain curve detennination and we compute tensile strength and ductility. Mechanical properties of different aramid-epoxy laminates are compared as well as stress-strain curves. KEY WORDS: stress-strain curve, tensile strength, laminate, composite 1. INTRODUCTIONIn the article [1], authors have dealt with detennination ofresonant frequencies and mode shapes of laminates by ESPI method. In the article [2], authors deal with the determination of mechanical properties oflaminates including titan alloys. In the article [3], authors describe mechanical properties and fracture behavior of Al2O3 laminates. 2. THEORETICAL BACKGROUNDIn tensile test done according to STN EN 10002-1, tested samples are loaded with constant speed, which is described by material nonn. Four mechanical properties are evaluated: - Tensile strength Rm - Yield stress RP - Ductility A- Contraction ZSpecial routine enables us to determine Young's modulus E, limit ofproportionality and limit ofelasticity. Stress u is defined by equation where: F - force [N] S - area perpendicular to force [mm2] Relative extension e is defined by equation F a=-dle=­lo where: dl - sample extension measured by extensometer on working part of sample [mm] 5 (1) (2)

Mechanical properties of aramid-epoxy laminates

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Mechanical properties of aramid-epoxy laminates

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