Bohdana Marvalova

Digital Image Correlation as a Measurement Tool for Large Deformations of a Conveyor Belt

Biaxial tension test of the cruciform specimen of styrene-butadiene rubber is described in this paper. The rubber layer is a part of the conveyor belt used for the transportation of coal. The specimen are loaded by the home made biaxial testing device. The big deformation of specimen are determined by the Digital Image Correlation. The parameters of Mooney-Rivlin hyperelastic material were determined. Numerical simulation of the biaxial test was performed in Comsol Muliphysics.

Tribological and Viscoelastic Behaviour of Carbon Black Filled Rubber

The paper describes a complex experimental research of tribological and mechanical properties of styrene-butadiene-rubber (SBR) filled with carbon black. Tribological properties of SBR rubber material are investigated experimentally using a home made device of ball-on-disc type. The response of SBR in sliding friction depends on sliding speed and on the loading force. The rate-dependent behaviour of carbon-black filled rubber is investigated in tensile tests with different loading rates and in relaxation tests. The viscosity-induced rate-dependent effects are described. The storage and loss moduli and phase angle δ dependency on different amplitudes and frequencies are determined by strain controlled dynamical mechanical analysis. The temperature dependence of dynamic and tribological behaviour of SBR is also investigated.Copyright

Identification Of Viscoelastic Model Of Filled Rubber And Numerical Simulation Of Its Time Dependent Response

The rate-dependent behavior of filled rubber was investigated in com- pression regimes. The viscosity-induced rate-dependent effects are described. The parameters of a constitutive model of finite strain viscoelasticity were determined by nonlinear optimization methods. The material model was implemented into finite element code and the viscoelastic stress response of carbon black filled rubber at large strains in relaxation, creep and cyclic loading was simulated.

Low Velocity Impact on Fiber Reinforced Geocomposites

Low velocity impact strength of the fabric reinforced geocomposite has investigated in this article. Various fabrics such as carbon and E-glass were considered for reinforcement in geopolymer matrix. The primary two parameters such as low velocity, impact damage modes are explained on the E-glass and carbon based fabric geocomposite. The onset mode of damage to failure mode is examined through C-scan analysis. The quality of the composite is observed using c-scan with acoustic vibration mode of sensor before and after impact test. Then the effect of fabric and matrix on the impact behaviour is discussed. Residual strength of the composite is measured to determine post impact behaviour. It has been observed that resistance properties of E-glass reinforced composite is better than carbon fabric reinforced composite.

Design and applications

A multi-reference source spanning the whole composites science field, this text covers such topics as: fibre reinforcements and general theory of composites; polymer matrix composites; metal matrix composites; test methods, nondestructive evaluation and smart composites; and design and application.