Tag Archives: tensile strength.

680-689 Č. Mizera, D. Herák, M. Müller and P. Hrabě
Mechanical behaviour of polymeric composite with fibres of false banana (Ensete ventricosum)
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Mechanical behaviour of polymeric composite with fibres of false banana (Ensete ventricosum)

Č. Mizera¹*, D. Herák², M. Müller³ and P. Hrabě⁴

¹ ²Czech University of Life Science Prague, Faculty of Engineering, Department of Mechanical Engineering, Kamýcká 129, CZ-16521 Praha 6 Suchdol, Czech Republic
³ ⁴Czech University of Life Science Prague, Faculty of Engineering, Department of Material Science and Manufacturing Technology, Kamýcká 129, CZ-16521 Praha 6 Suchdol, Czech Republic *Correspondence: mizera@tf.czu.cz

Abstract:

This study was focused on the analysis of the deformation characteristics of the polymer composite with continuous phase in the form of two-part epoxies and discontinuous phase (reinforcing particles) in the form of fibres of false banana (Ensete ventricosum). The aim of the experiment was to describe the mechanical behaviour of polymeric composite reinforced by fibres of false banana under tensile loading and to determine the modulus of elasticity and deformation energy. The fibres of Ensete ventricosum, originally from Ethiopian region Hawasa, were used in this experiment. Reinforcing fibres were prepared in sizes of lengths 1–2, 2–3, 3–5, 5–6, 7–8, 9–10, 15, 20, 25, 30, and 35 mm with randomly fibres arrangement in matrix. The fibres with length of 1–2, 2–3, 3–5, 5–6, 7–8 and 9–10 mm were used in short fibres composites and fibres with length of 10, 15, 20, 25, 30 and 35 mm in long fibres composites. The composite material was created with 2 wt.% of the filler. The modulus of elasticity of the short-fibre composite material was increased of 28 ± 12% by adding Enset fibres as the filler. The modulus of elasticity of the long-fibre composite material was increased of 46 ± 14%. The influence of the fibre length on the value of the volume deformation energy was not proved.

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723-731 P. Valášek
Polymeric microparticles composites with waste EPDM rubber powder
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Polymeric microparticles composites with waste EPDM rubber powder

P. Valášek

Czech University of Life Sciences Prague, Department of material science and manufacturing engineering, Kamýcká 129, CZ-16521, Prague, Czech Republic; e-mail: valasekp@tf.czu.cz

Abstract:

Polymeric materials filled with inorganic microparticles can be described as polymeric microparticle composites. These materials combine the various mechanical, physical and chemical properties of different phases. Waste microparticles can also be used as filler. Inclusion of these waste microparticles can optimize the required mechanical properties and decrease the price. This paper describes the possibilities of using recycled waste rubber powder in polymer composite systems. The aim of the experiment was to quantify the mechanical properties of epoxy resin (Glue Epox Rapid – with increased speed of hardening) and polyurethane (Sika Power – resin based on polyol) filled with recycled EPDM rubber powder (29 µm) gained from a Czech company and to describe the changes in the mechanical qualities with a changeable amount of microparticles. Composites were prepared with a different filler concentration of resins (5–35 volume percent). Cohesive and adhesive characteristics were chosen for the quantification of the system. Adhesive strength to the steel adherent was tested by means of lap-shear tensile strength. Cohesive strength was tested by means of tensile strength. Hardness was measured by the Shore D method. The described use of waste material is inexpensive and offers the possibility of recycling material. The application of waste EPDM powder in the area of resins is a benfitial way of material usage which should be preferred.

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